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* pinctrl.txt: move it to the driver-api bookMauro Carvalho Chehab2017-06-201-1439/+0
| | | | | | | | As pinctrl describes a feature from drivers/base, place it at the right book. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: pinctrl.txt: standardize document formatMauro Carvalho Chehab2017-05-231-554/+570
| | | | | | | | | | | | | | | | | | | Each text file under Documentation follows a different format. Some doesn't even have titles! Change its representation to follow the adopted standard, using ReST markups for it to be parseable by Sphinx. This document is almost following the standard stile. There are only two things to adjust on it: - promote the level of the document title; - mark literal blocks as such. Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> [Fix some indentations] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: core: Fix pinctrl_register_and_init() with pinctrl_enable()Tony Lindgren2017-04-071-1/+7
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Recent pinctrl changes to allow dynamic allocation of pins exposed one more issue with the pinctrl pins claimed early by the controller itself. This caused a regression for IMX6 pinctrl hogs. Before enabling the pin controller driver we need to wait until it has been properly initialized, then claim the hogs, and only then enable it. To fix the regression, split the code into pinctrl_claim_hogs() and pinctrl_enable(). And then let's require that pinctrl_enable() is always called by the pin controller driver when ready after calling pinctrl_register_and_init(). Depends-on: 950b0d91dc10 ("pinctrl: core: Fix regression caused by delayed work for hogs") Fixes: df61b366af26 ("pinctrl: core: Use delayed work for hogs") Fixes: e566fc11ea76 ("pinctrl: imx: use generic pinctrl helpers for managing groups") Cc: Haojian Zhuang <haojian.zhuang@linaro.org> Cc: Masahiro Yamada <yamada.masahiro@socionext.com> Cc: Mika Penttilä <mika.penttila@nextfour.com> Cc: Mika Westerberg <mika.westerberg@linux.intel.com> Cc: Nishanth Menon <nm@ti.com> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Stefan Agner <stefan@agner.ch> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Tested-by: Gary Bisson <gary.bisson@boundarydevices.com> Tested-by: Fabio Estevam <fabio.estevam@nxp.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: core: Fix regression caused by delayed work for hogsTony Lindgren2017-01-131-3/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Commit df61b366af26 ("pinctrl: core: Use delayed work for hogs") caused a regression at least with sh-pfc that is also a GPIO controller as noted by Geert Uytterhoeven <geert@linux-m68k.org>. As the original pinctrl_register() has issues calling pin controller driver functions early before the controller has finished registering, we can't just revert commit df61b366af26. That would break the drivers using GENERIC_PINCTRL_GROUPS or GENERIC_PINMUX_FUNCTIONS. So let's fix the issue with the following steps as a single patch: 1. Revert the late_init parts of commit df61b366af26. The late_init clearly won't work and we have to just give up on fixing pinctrl_register() for GENERIC_PINCTRL_GROUPS and GENERIC_PINMUX_FUNCTIONS. 2. Split pinctrl_register() into two parts By splitting pinctrl_register() into pinctrl_init_controller() and pinctrl_create_and_start() we have better control over when it's safe to call pinctrl_create(). 3. Introduce a new pinctrl_register_and_init() function As suggested by Linus Walleij <linus.walleij@linaro.org>, we can just introduce a new function for the controllers that need pinctrl_create() called later. 4. Convert the four known problem cases to use new function Let's convert pinctrl-imx, pinctrl-single, sh-pfc and ti-iodelay to use the new function to fix the issues. The rest of the drivers can be converted later. Let's also update Documentation/pinctrl.txt accordingly because of the known issues with pinctrl_register(). Fixes: df61b366af26 ("pinctrl: core: Use delayed work for hogs") Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Gary Bisson <gary.bisson@boundarydevices.com> Signed-off-by: Tony Lindgren <tony@atomide.com> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: Flag strict is a field in struct pinmux_opsAndy Shevchenko2016-06-231-1/+1
| | | | | | | | | Documentation incorrectly refers to struct pinctrl_desc, where no such flag is available. Replace the name of the struct. Fixes: commit 8c4c2016345f ("pinctrl: move strict option to pinmux_ops") Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: Reflow/wrap paragraph describing GPIO interactionAndrew Jeffery2016-06-131-7/+7
| | | | | Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: s/have/has/ in GPIO driver interaction descriptionAndrew Jeffery2016-06-131-1/+1
| | | | | Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: Fix grammar in pinmux request listAndrew Jeffery2016-06-131-4/+4
| | | | | Signed-off-by: Andrew Jeffery <andrew@aj.id.au> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: move strict option to pinmux_opsLinus Walleij2015-05-061-1/+1
| | | | | | | | | | While the pinmux_ops are ideally just a vtable for pin mux calls, the "strict" setting belongs so intuitively with the pin multiplexing that we should move it here anyway. Putting it in the top pinctrl_desc makes no sense. Cc: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: allow exlusive GPIO/mux pin allocationSonic Zhang2015-05-061-0/+11
| | | | | | | | | | | | | | | | | | | | | Disallow simultaneous use of the the GPIO and peripheral mux functions by setting a flag "strict" in struct pinctrl_desc. The blackfin pinmux and gpio controller doesn't allow user to set up a pin for both GPIO and peripheral function. So, add flag strict in struct pinctrl_desc to check both gpio_owner and mux_owner before approving the pin request. v2-changes: - if strict flag is set, check gpio_owner and mux_onwer in if and else clause v3-changes: - add kerneldoc for this struct - augment Documentation/pinctrl.txt Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: fix example .get_group_pins implementation signatureBaruch Siach2015-03-181-2/+2
| | | | | | | | | | The callback function signature has changed in commit a5818a8bd0 (pinctrl: get_group_pins() const fixes) Fixes: a5818a8bd0 ('pinctrl: get_group_pins() const fixes') Cc: Stephen Warren <swarren@nvidia.com> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: staticise example code funcs/structsBaruch Siach2015-03-181-4/+4
| | | | | | | Make the example code consistent wrt local function and struct definitions. Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: remove doc mention of the enable/disable APIBaruch Siach2015-03-181-3/+4
| | | | | | | | | | This API has changed in commit 6e5e959dde0 (pinctrl: API changes to support multiple states per device). Fixes: 6e5e959dde0 ('pinctrl: API changes to support multiple states per device') Cc: Stephen Warren <swarren@nvidia.com> Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: remove enable/disable callbacks from documentationBaruch Siach2015-03-181-3/+2
| | | | | | | | | | Commit 03e9f0cac5d (pinctrl: clean up after enable refactoring) updated the documentation to remove mention of disable(), and rename enable() to set_mux(). One in-text mention was forgotten. Fix this. Fixes: 03e9f0cac5d ('pinctrl: clean up after enable refactoring') Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: remove maxpin from documentationBaruch Siach2015-03-091-1/+0
| | | | | | | | | struct pinctrl_desc does not contain the maxpin member since commit 0d2006bbf0 (pinctrl: remove unnecessary max pin number). Fixes: 0d2006bbf0 ('pinctrl: remove unnecessary max pin number') Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: clean up after enable refactoringLinus Walleij2014-09-041-12/+2
| | | | | | | | | | | | | | | | | commit 2243a87d90b42eb38bc281957df3e57c712b5e56 "pinctrl: avoid duplicated calling enable_pinmux_setting for a pin" removed the .disable callback from the struct pinmux_ops, making the .enable() callback the only remaining callback. However .enable() is a bad name as it seems to imply that a muxing can also be disabled. Rename the callback to .set_mux() and also take this opportunity to clean out any remaining mentions of .disable() from the documentation. Acked-by: Stephen Warren <swarren@nvidia.com> Acked-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> Acked-by: Fan Wu <fwu@marvell.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: Fix some typos and grammar issues in the documentationLaszlo Papp2014-01-151-22/+21
| | | | | | | | | | I had been trying to learn a bit more about the pinctrl subsystem, and I realized several typos and grammar issues while going through the documentation. I have probably not caught all the possible issues, but this change is addressing several places for improvement. Signed-off-by: Laszlo Papp <lpapp@kde.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: add documentation for pinctrl_get_group_pins()Christian Ruppert2013-10-161-1/+6
| | | | | | | | This patch adds a short description of how to use the newly added pinctrl_get_group_pins function to the pinctrl documentation. Signed-off-by: Christian Ruppert <christian.ruppert@abilis.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* Documentation: pinctrl: Fix example code for pinctrl_registerAxel Lin2013-08-231-1/+1
| | | | | | | pinctrl_register() returns NULL on error, fix it. Signed-off-by: Axel Lin <axel.lin@ingics.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* Documentation: pinctrl: Fix example codeSachin Kamat2013-08-141-4/+4
| | | | | | | | | __initdata should be placed between the variable name and equal sign for the variable to be placed in the intended section. Fix the examples. Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: elaborate a bit on arrangements in docLinus Walleij2013-07-231-6/+85
| | | | | | | | | | | | | This elaborates a bit on the pin control and pin muxing logic vs GPIO arangements in the hardware. Inspired by some drawings in a mail from Christian Ruppert. Both arrangements are confirmed to exist in practice. Cc: Rob Landley <rob@landley.net> Reviewed-by: Christian Ruppert <christian.ruppert@abilis.com> Reviewed-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* Merge branch 'for-linus' of ↵Linus Torvalds2013-07-041-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial Pull trivial tree updates from Jiri Kosina: "The usual stuff from trivial tree" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (34 commits) treewide: relase -> release Documentation/cgroups/memory.txt: fix stat file documentation sysctl/net.txt: delete reference to obsolete 2.4.x kernel spinlock_api_smp.h: fix preprocessor comments treewide: Fix typo in printk doc: device tree: clarify stuff in usage-model.txt. open firmware: "/aliasas" -> "/aliases" md: bcache: Fixed a typo with the word 'arithmetic' irq/generic-chip: fix a few kernel-doc entries frv: Convert use of typedef ctl_table to struct ctl_table sgi: xpc: Convert use of typedef ctl_table to struct ctl_table doc: clk: Fix incorrect wording Documentation/arm/IXP4xx fix a typo Documentation/networking/ieee802154 fix a typo Documentation/DocBook/media/v4l fix a typo Documentation/video4linux/si476x.txt fix a typo Documentation/virtual/kvm/api.txt fix a typo Documentation/early-userspace/README fix a typo Documentation/video4linux/soc-camera.txt fix a typo lguest: fix CONFIG_PAE -> CONFIG_x86_PAE in comment ...
| * doc: fix misspellings with 'codespell' toolAnatol Pomozov2013-05-281-1/+1
| | | | | | | | | | Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | pinctrl: rip out the direct pinconf APILinus Walleij2013-06-251-9/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | From the inception ot the pin config API there has been the possibility to get a handle at a pin directly and configure its electrical characteristics. For this reason we had: int pin_config_get(const char *dev_name, const char *name, unsigned long *config); int pin_config_set(const char *dev_name, const char *name, unsigned long config); int pin_config_group_get(const char *dev_name, const char *pin_group, unsigned long *config); int pin_config_group_set(const char *dev_name, const char *pin_group, unsigned long config); After the introduction of the pin control states that will control pins associated with devices, and its subsequent introduction to the device core, as well as the introduction of pin control hogs that can set up states on boot and optionally also at sleep, this direct pin control API is a thing of the past. As could be expected, it has zero in-kernel users. Let's delete this API and make our world simpler. Reported-by: Tony Lindgren <tony@atomide.com> Reviewed-by: Stephen Warren <swarren@nvidia.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* | pinctrl: update GPIO range docLinus Walleij2013-06-171-3/+21
| | | | | | | | | | | | | | | | | | This updates the GPIO range documentation with the API changes for sparse/random/arbitrary pin-to-GPIO mappings. Reviewed-by: Christian Ruppert <christian.ruppert@abilis.com> Acked-by: Rob Landley <rob@landley.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* | Documentation/pinctrl.txt: fix typo "with with"James Hogan2013-06-161-2/+2
|/ | | | | | | | | Fix typo in "communicate directly with with the pinctrl subsystem". Signed-off-by: James Hogan <james.hogan@imgtec.com> Cc: Linus Walleij <linus.walleij@linaro.org> Acked-by: Rob Landley <rob@landley.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: document the "GPIO mode" pitfallLinus Walleij2013-03-181-0/+112
| | | | | | | | | | | | | | | | | Recently as adoption of the pinctrl framework is reaching niches where the pins are reconfigured during system sleep and datasheets often talk about something called "GPIO mode", some engineers become confused by this, thinking that since it is named "GPIO (something something)" it must be modeled in the kernel using <linux/gpio.h>. To clarify things, let's put in this piece of documentation, or just start off the discussion here. Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Pankaj Dev <pankaj.dev@st.com> Reviewed-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* drivers/pinctrl: grab default handles from device coreLinus Walleij2013-01-231-3/+15
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This makes the device core auto-grab the pinctrl handle and set the "default" (PINCTRL_STATE_DEFAULT) state for every device that is present in the device model right before probe. This will account for the lion's share of embedded silicon devcies. A modification of the semantics for pinctrl_get() is also done: previously if the pinctrl handle for a certain device was already taken, the pinctrl core would return an error. Now, since the core may have already default-grabbed the handle and set its state to "default", if the handle was already taken, this will be disregarded and the located, previously instanitated handle will be returned to the caller. This way all code in drivers explicitly requesting their pinctrl handlers will still be functional, and drivers that want to explicitly retrieve and switch their handles can still do that. But if the desired functionality is just boilerplate of this type in the probe() function: struct pinctrl *p; p = devm_pinctrl_get_select_default(&dev); if (IS_ERR(p)) { if (PTR_ERR(p) == -EPROBE_DEFER) return -EPROBE_DEFER; dev_warn(&dev, "no pinctrl handle\n"); } The discussion began with the addition of such boilerplate to the omap4 keypad driver: http://marc.info/?l=linux-input&m=135091157719300&w=2 A previous approach using notifiers was discussed: http://marc.info/?l=linux-kernel&m=135263661110528&w=2 This failed because it could not handle deferred probes. This patch alone does not solve the entire dilemma faced: whether code should be distributed into the drivers or if it should be centralized to e.g. a PM domain. But it solves the immediate issue of the addition of boilerplate to a lot of drivers that just want to grab the default state. As mentioned, they can later explicitly retrieve the handle and set different states, and this could as well be done by e.g. PM domains as it is only related to a certain struct device * pointer. ChangeLog v4->v5 (Stephen): - Simplified the devicecore grab code. - Deleted a piece of documentation recommending that pins be mapped to a device rather than hogged. ChangeLog v3->v4 (Linus): - Drop overzealous NULL checks. - Move kref initialization to pinctrl_create(). - Seeking Tested-by from Stephen Warren so we do not disturb the Tegra platform. - Seeking ACK on this from Greg (and others who like it) so I can merge it through the pinctrl subsystem. ChangeLog v2->v3 (Linus): - Abstain from using IS_ERR_OR_NULL() in the driver core, Russell recently sent a patch to remove it. Handle the NULL case explicitly even though it's a bogus case. - Make sure we handle probe deferral correctly in the device core file. devm_kfree() the container on error so we don't waste memory for devices without pinctrl handles. - Introduce reference counting into the pinctrl core using <linux/kref.h> so that we don't release pinctrl handles that have been obtained for two or more places. ChangeLog v1->v2 (Linus): - Only store a pointer in the device struct, and only allocate this if it's really used by the device. Cc: Felipe Balbi <balbi@ti.com> Cc: Benoit Cousson <b-cousson@ti.com> Cc: Dmitry Torokhov <dmitry.torokhov@gmail.com> Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Cc: Mitch Bradley <wmb@firmworks.com> Cc: Ulf Hansson <ulf.hansson@linaro.org> Cc: Rafael J. Wysocki <rjw@sisk.pl> Cc: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Cc: Rickard Andersson <rickard.andersson@stericsson.com> Cc: Russell King <linux@arm.linux.org.uk> Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> [swarren: fixed and simplified error-handling in pinctrl_bind_pins(), to correctly handle deferred probe. Removed admonition from docs not to use pinctrl hogs for devices] Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* gpiolib: provide provision to register pin rangesShiraz Hashim2012-11-111-0/+3
| | | | | | | | | | | | | | | | | | | | | | | pinctrl subsystem needs gpio chip base to prepare set of gpio pin ranges, which a given pinctrl driver can handle. This is important to handle pinctrl gpio request calls in order to program a given pin properly for gpio operation. As gpio base is allocated dynamically during gpiochip registration, presently there exists no clean way to pass this information to the pinctrl subsystem. After few discussions from [1], it was concluded that may be gpio controller reporting the pin range it supports, is a better way than pinctrl subsystem directly registering it. [1] http://comments.gmane.org/gmane.linux.ports.arm.kernel/184816 Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com> [Edited documentation a bit] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: reserve pins when states are activatedLinus Walleij2012-11-111-1/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This switches the way that pins are reserved for multiplexing: We used to do this when the map was parsed, at the creation of the settings inside the pinctrl handle, in pinmux_map_to_setting(). However this does not work for us, because we want to use the same set of pins with different devices at different times: the current code assumes that the pin groups in a pinmux state will only be used with one single device, albeit different groups can be active at different times. For example if a single I2C driver block is used to drive two different busses located on two pin groups A and B, then the pins for all possible states of a function are reserved when fetching the pinctrl handle: the I2C bus can choose either set A or set B by a mux state at runtime, but all pins in both group A and B (the superset) are effectively reserved for that I2C function and mapped to the device. Another device can never get in and use the pins in group A, even if the device/function is using group B at the moment. Instead: let use reserve the pins when the state is activated and drop them when the state is disabled, i.e. when we move to another state. This way different devices/functions can use the same pins at different times. We know that this is an odd way of doing things, but we really need to switch e.g. an SD-card slot to become a tracing output sink at runtime: we plug in a special "tracing card" then mux the pins that used to be an SD slot around to the tracing unit and push out tracing data there instead of SD-card traffic. As a side effect pinmux_free_setting() is unused but the stubs are kept for future additions of code. Cc: Patrice Chotard <patrice.chotard@st.com> Cc: Loic Pallardy <loic.pallardy@st.com> Acked-by: Stephen Warren <swarren@nvidia.com> Tested-by: Jean Nicolas Graux <jean-nicolas.graux@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: document semantics vs GPIOLinus Walleij2012-09-171-2/+58
| | | | | | | | | | | The semantics of the interactions between GPIO and pinctrl may be unclear, e.g. which one do you request first? This amends the documentation to make this clear. Reported-by: Domenico Andreoli <cavokz@gmail.com> Acked-by: Domenico Andreoli <domenico.andreoli@linux.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* Documentation/pinctrl.txt: Fix some misspelled macrosDaniel Mack2012-08-171-3/+3
| | | | | Signed-off-by: Daniel Mack <zonque@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: implement devm_pinctrl_get()/put()Stephen Warren2012-04-181-19/+29
| | | | | | | | These functions allow the driver core to automatically clean up any allocations made by drivers, thus leading to simplified drivers. Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: implement pinctrl deferred probingLinus Walleij2012-04-181-0/+5
| | | | | | | | | | | | | | If drivers try to obtain pinctrl handles for a pin controller that has not yet registered to the subsystem, we need to be able to back out and retry with deferred probing. So let's return -EPROBE_DEFER whenever this location fails. Also downgrade the errors to info, maybe we will even set them to debug once the deferred probing is commonplace. Cc: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: replace list_*() with get_*_count()Viresh Kumar2012-04-181-22/+15
| | | | | | | | | | | | | | | | | | | | | | | | Most of the SoC drivers implement list_groups() and list_functions() routines for pinctrl and pinmux. These routines continue returning zero until the selector argument is greater than total count of available groups or functions. This patch replaces these list_*() routines with get_*_count() routines, which returns the number of available selection for SoC driver. pinctrl layer will use this value to check the range it can choose. This patch fixes all user drivers for this change. There are other routines in user drivers, which have checks to check validity of selector passed to them. It is also no more required and hence removed. Documentation updated as well. Acked-by: Stephen Warren <swarren@wwwdotorg.org> Signed-off-by: Viresh Kumar <viresh.kumar@st.com> [Folded in fix and fixed a minor merge artifact manually] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: mark const init data with __initconst instead of __initdataUwe Kleine-König2012-04-181-1/+1
| | | | | | | | | | | | | | | As long as there is no other non-const variable marked __initdata in the same compilation unit it doesn't hurt. If there were one however compilation would fail with error: $variablename causes a section type conflict because a section containing const variables is marked read only and so cannot contain non-const variables. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Cc: Randy Dunlap <rdunlap@xenotime.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* Documentation: pinctrl: add missing spi0_0 grp in exampleViresh Kumar2012-04-181-1/+1
| | | | | | | Missed one group from the documentation when proofreading. Signed-off-by: Viresh Kumar <viresh.kumar@st.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: enhance mapping table to support pin config operationsStephen Warren2012-03-051-12/+64
| | | | | | | | | | | | | | | | | | | | | The pinctrl mapping table can now contain entries to: * Set the mux function of a pin group * Apply a set of pin config options to a pin or a group This allows pinctrl_select_state() to apply pin configs settings as well as mux settings. v3: Fix find_pinctrl() to iterate over the correct list. s/_MUX_CONFIGS_/_CONFIGS_/ in mapping table macros. Fix documentation to use correct mapping table macro. v2: Added numerous extra PIN_MAP_*() special-case macros. Fixed kerneldoc typo. Delete pinctrl_get_pin_id() and replace it with pin_get_from_name(). Various minor fixes. Updates due to rebase. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: API changes to support multiple states per deviceStephen Warren2012-03-051-41/+79
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The API model is changed from: p = pinctrl_get(dev, "state1"); pinctrl_enable(p); ... pinctrl_disable(p); pinctrl_put(p); p = pinctrl_get(dev, "state2"); pinctrl_enable(p); ... pinctrl_disable(p); pinctrl_put(p); to this: p = pinctrl_get(dev); s1 = pinctrl_lookup_state(p, "state1"); s2 = pinctrl_lookup_state(p, "state2"); pinctrl_select_state(p, s1); ... pinctrl_select_state(p, s2); ... pinctrl_put(p); This allows devices to directly transition between states without disabling the pin controller programming and put()/get()ing the configuration data each time. This model will also better suit pinconf programming, which doesn't have a concept of "disable". The special-case hogging feature of pin controllers is re-written to use the regular APIs instead of special-case code. Hence, the pinmux-hogs debugfs file is removed; see the top-level pinctrl-handles files for equivalent data. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: assume map table entries can't have a NULL name fieldStephen Warren2012-03-021-4/+3
| | | | | | | | | | | | | | | | | | pinctrl_register_mappings() already requires that every mapping table entry have a non-NULL name field. Logically, this makes sense too; drivers should always request a specific named state so they know what they're getting. Relying on getting the first mentioned state in the mapping table is error-prone, and a nasty special case to implement, given that a given the mapping table may define multiple states for a device. Remove a small part of the documentation that talked about optionally requesting a specific state; it's mandatory now. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: introduce PINCTRL_STATE_DEFAULT, define hogs as that stateStephen Warren2012-03-021-4/+4
| | | | | | | | | | | | | | | | | | | | This provides a single centralized name for the default state. Update PIN_MAP_* macros to use this state name, instead of requiring the user to pass a state name in. With this change, hog entries in the mapping table are defined as those with state name PINCTRL_STATE_DEFAULT, i.e. all entries have the same name. This interacts badly with the nested iteration over mapping table entries in pinctrl_hog_maps() and pinctrl_hog_map() which would now attempt to claim each hog mapping table entry multiple times. Replacing the custom hog code with a simple pinctrl_get()/pinctrl_enable(). Update documentation and mapping tables to use this. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: re-order struct pinctrl_mapStephen Warren2012-02-291-12/+12
| | | | | | | | | | | | | | | | | | The lookup key in struct pinctrl_map is (.dev_name, .name). Re-order the struct definition to put the lookup key fields first, and the result values afterwards. To me at least, this slightly better reflects the lookup process. Update the documentation in a similar fashion. Note: PIN_MAP*() macros aren't updated; I plan to update this once later when enhancing the mapping table format to support pin config to reduce churn. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Dong Aisheng <dong.aisheng@linaro.org> [Rebased for cherry-picking] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: disallow map table entries with NULL dev_name fieldStephen Warren2012-02-241-10/+5
| | | | | | | | | | | | | | Hog entries are mapping table entries with .ctrl_dev_name == .dev_name. All other mapping table entries need .dev_name set so that they will match some pinctrl_get() call. All extant PIN_MAP*() macros set .dev_name. So, there is no reason to allow mapping table entries without .dev_name set. Update the code and documentation to disallow this. Signed-off-by: Stephen Warren <swarren@nvidia.com> Acked-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: changes hog mechanism to be self-referentialLinus Walleij2012-02-101-4/+4
| | | | | | | | | | | Instead of a specific boolean field to indicate if a map entry shall be hogged, treat self-reference as an indication of desired hogging. This drops one field off the map struct and has a nice Douglas R. Hofstadter-feel to it. Acked-by: Dong Aisheng <dong.aisheng@linaro.org> Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: move generic functions to the pinctrl_ namespaceLinus Walleij2012-02-101-59/+59
| | | | | | | | | | | | | | Since we want to use the former pinmux handles and mapping tables for generic control involving both muxing and configuration we begin refactoring by renaming them from pinmux_* to pinctrl_*. ChangeLog v1->v2: - Also rename the PINMUX_* macros in machine.h to PIN_ as indicated in the documentation so as to reflect the generic nature of these mapping entries from now on. Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: break out a pinctrl consumer headerLinus Walleij2012-02-101-1/+5
| | | | | | | | | | This breaks out a <linux/pinctrl/consumer.h> header to be used by all pinmux and pinconfig alike, so drivers needing services from pinctrl does not need to include different headers. This is similar to the approach taken by the regulator API. Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: delete raw device pointers in pinmux mapsLinus Walleij2012-02-011-4/+1
| | | | | | | | | | | | After discussion with Mark Brown in an unrelated thread about ADC lookups, it came to my knowledge that the ability to pass a struct device * in the regulator consumers is just a historical artifact, and not really recommended. Since there are no in-kernel users of these pointers, we just kill them right now, before someone starts to use them. Reviewed-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: fix some pinmux typosTony Lindgren2012-01-261-1/+1
| | | | | | | | Fix some pinmux typos so implementing pinmux drivers is a bit easier. Signed-off-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* Documentation/pinctrl: fix a few syntax errors in code examplesUwe Kleine-König2012-01-241-8/+7
| | | | | | Acked-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
* pinctrl: some typo fixesDong Aisheng2012-01-031-5/+5
| | | | | | | Minor copyedits. Signed-off-by: Dong Aisheng <dong.aisheng@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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