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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi updates from Mark Brown:
"There's some quite exciting core work in this release, we've got the
beginnings of support for hardware initiated transfers which is itself
independently useful for optimising fast paths in existing drivers.
We also have a rework of the DMA mapping which allows finer grained
decisions about DMA mapping messages and also helps remove some bodges
that we'd had.
Otherwise it's a fairly quiet release, a few new drivers and features
for existing drivers, together with various cleanups and DT binding
conversions.
One regmap SPI fix made it's way in here too which I should probably
have sent as a regmap fix instead.
Summary:
- Support for pre-optimising messages, reducing the overhead for
messages that are repeatedly used (eg, reading the interrupt status
from a device). This will also be used for hardware initiated
transfers in future.
- A reworking of how DMA mapping is done, introducing a new helper
and allowing the DMA mapping decision to be done per transfer
instead of per message.
- Support for Atmel SAMA7D64, Freescale LX2160A DSPI and WCH CH341A"
* tag 'spi-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (72 commits)
spi: dt-bindings: at91: Add sama7d65 compatible string
spi: add ch341a usb2spi driver
spi: dt-bindings: fsl-dspi: add compatible string 'fsl,lx2160a-dspi'
spi: dt-bindings: fsl-dspi: add dmas and dma-names properties
spi: spi: Remove unnecessary ‘0’ values from status
spi: spi: Remove unnecessary ‘0’ values from rc
spi: xcomm: fix coding style
spi: xcomm: remove i2c_set_clientdata()
spi: xcomm: make use of devm_spi_alloc_host()
spi: xcomm: add gpiochip support
spi: dt-bindings: snps,dw-apb-ssi.yaml: update compatible property
spi: dt-bindings: fsl-dspi: Convert to yaml format
spi: fsl-dspi: use common proptery 'spi-cs-setup(hold)-delay-ns'
spi: axi-spi-engine: remove platform_set_drvdata()
spi: spi-fsl-lpspi: Pass pm_ptr()
spi: spi-imx: Pass pm_ptr()
spi: spi-fsl-lpspi: Switch to SYSTEM_SLEEP_PM_OPS()
spi: spi-imx: Switch to RUNTIME_PM_OPS/SYSTEM_SLEEP_PM_OPS()
spi: add EXPORT_SYMBOL_GPL(devm_spi_optimize_message)
spi: add devm_spi_optimize_message() helper
...
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Add compatible string for sama7d65. Like sam9x60 and sam9x7, it requires
to bind to "atmel,at91rm9200-spi".
Group these three under the same enum, sorted alphanumerically, and
remove previously added item.
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20240711165402.373634-1-nicolas.ferre@microchip.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add compatible string 'fsl,lx2160a-dspi' and allow fall back to
'fsl,ls2085a-dspi'.
Fix below CHECK_DTBS warning.
arch/arm64/boot/dts/freescale/fsl-lx2160a-bluebox3.dtb: spi@2100000: compatible: 'oneOf' conditional failed, one must be fixed:
['fsl,lx2160a-dspi', 'fsl,ls2085a-dspi'] is too long
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://patch.msgid.link/20240703165931.2325807-2-Frank.Li@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add dmas and dma-names properties because dspi support dma transfer.
Fix below warnings:
arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-sl28-var1.dtb: spi@2120000: Unevaluated properties are not allowed ('dma-names', 'dmas', 'little-endian' were unexpected)
from schema $id: http://devicetree.org/schemas/spi/fsl,dspi.yaml#
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://patch.msgid.link/20240703165931.2325807-1-Frank.Li@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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updated compatible property to include "thead,th1520-spi" for the
TH1520 SoC SPI Controller.
Signed-off-by: Kanak Shilledar <kanakshilledar@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20240701121355.262259-3-kanakshilledar@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Convert dt-binding spi-fsl-dspi.txt to yaml format.
Use part Vladimir Oltean's work at of
https://lore.kernel.org/linux-spi/20221111224651.577729-1-vladimir.oltean@nxp.com/
Additional changes during convert:
- compatible string "fsl,ls1028a-dspi" can be followed by
fsl,ls1021a-v1.0-dspi.
- Change "dspi0@4002c000" to "spi@4002c000" in example.
- Reorder properties in example.
- Use GIC include in example.
- Deprecated fsl,spi-cs-sck-delay and fsl,spi-sck-cs-delay by use common SPI
property.
- Use compatible string 'jedec,spi-nor' in example.
- Split peripheral part to fsl,dspi-peripheral-props.yaml.
- Remove 'interrupts' and 'pinctrl' from required list.
- Update 'bus-num' description.
- Update 'spi-num-chipselects' description by add "cs-gpios don't count
against this number".
- Remove 'big-endian' description.
Co-developed-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Signed-off-by: Kuldeep Singh <kuldeep.singh@nxp.com>
Co-developed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Vladimir Oltean <olteanv@gmail.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20240624-ls_qspi-v4-2-3d1c6f5005bf@nxp.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Merge series from David Lechner <dlechner@baylibre.com>:
In the IIO subsystem, we are finding that it is common to call
spi_optimize_message() during driver probe since the SPI message
doesn't change for the lifetime of the driver. This patch adds a
devm_spi_optimize_message() helper to simplify this common pattern.
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This adds a new helper function devm_spi_optimize_message() that
automatically registers spi_unoptimize_message() to be called
when the device is removed.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20240621-devm_spi_optimize_message-v1-2-3f9dcba6e95e@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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A few SPI devm_* helpers were missing from the devres documentation.
This patch adds them.
Signed-off-by: David Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20240621-devm_spi_optimize_message-v1-1-3f9dcba6e95e@baylibre.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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On the Amlogic A1, the SPI FC controller can require a power-domain to
operate, add it as optional.
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://msgid.link/r/20240605-topic-amlogic-upstream-bindings-fixes-power-domains-spifc-v1-1-380f29ba4a16@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
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We need these to get the i.MX8 boards working in CI again.
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Merge series from Prajna Rajendra Kumar <prajna.rajendrakumar@microchip.com>:
The Microchip PolarFire SoC SPI "hard" controller supports eight
chip selects. However, only one chip select is physically wired.
Therefore, use GPIO descriptors to configure additional chip select
lines.
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The PolarFire SoC SPI "hard" controller supports eight CS lines, out of
which only one CS line is physically wired. The default value of
'num-cs' was never set and it did not didn't impose a maximum value.
To reflect this hardware limitation in the device tree, the binding
enforces that the 'num-cs' property cannot exceed 1 unless additional
CS lines are explicitly defined using GPIO descriptors.
Fixes: 2da187304e55 ("spi: add bindings for microchip mpfs spi")
Signed-off-by: Prajna Rajendra Kumar <prajna.rajendrakumar@microchip.com>
Link: https://msgid.link/r/20240514104508.938448-2-prajna.rajendrakumar@microchip.com
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Merge series from Ji Sheng Teoh <jisheng.teoh@starfivetech.com>:
The first patch adds optional reset control to support assertion and
deassertion of reset signal to properly bring the SPI device into an
operating condition.
The second patch documents the optional reset control into dt-bindings.
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Document the optional reset control to SPI.
Co-developed-by: Eng Lee Teh <englee.teh@starfivetech.com>
Signed-off-by: Eng Lee Teh <englee.teh@starfivetech.com>
Co-developed-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
Signed-off-by: Ley Foon Tan <leyfoon.tan@starfivetech.com>
Signed-off-by: Ji Sheng Teoh <jisheng.teoh@starfivetech.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240508054728.1751162-3-jisheng.teoh@starfivetech.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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IBM Power processors have a SPI controller that can be accessed
over FSI from a service processor. Document it.
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240514192630.152747-1-eajames@linux.ibm.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Convert the Broadcom BCM2835 SPI0 controller to newer DT
schema. Created DT schema based on the .txt file which had
`comaptible`, `reg`, `interrupts`, `clocks` as required
properties.
Added GPL-2.0 OR BSD-2-Clause License
Signed-off-by: Kanak Shilledar <kanakshilledar111@protonmail.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://msgid.link/r/20240514070051.2959-1-kanakshilledar111@protonmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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The Marvell PXA SSP block is the same or similiar to the MMP2 variant.
The only difference in the binding is the PXA version supports DMA (and
that's probably a binding difference rather than an actual h/w
difference).
The old binding didn't belong under 'serial' as it is not a UART. The
SSP block also supports audio devices, so 'spi' is not a perfect fit
either. As the existing schema for MMP2 is there, just leave things
as-is.
The examples in the old text binding were pretty out of sync with
reality. 'clock-names' and 'ssp-id' aren't documented nor used.
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://msgid.link/r/20240522132859.3146335-1-robh@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Pull regulator updates from Mark Brown:
"This s a very quiet release for the regulator API, we have a few new
devices (most of which are just ID updates) and one new fairly
specialist core feature for use in interrupt context.
- An API allowing lockless enable/disable for regulators acquired in
exclusive mode, for use in interrupt contexts
- A rewrite of the MedaTek DVFSRC regulator driver which apparently
never worked
- Support for Mediaktek MT6312, Qualcomm QCA6390 and WCN7850, Renesas
RZ/G2L USB VBUS regulator and ST Microelectronics STM32MP13"
* tag 'regulator-v6.11' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator: (26 commits)
regulator: dt-bindings: pca9450: Make interrupt optional
regulator: pca9450: Make IRQ optional
dt-bindings: regulator: sprd,sc2731-regulator: convert to YAML
regulator: max77857: Constify struct regmap_config
regulator: da9121: Constify struct regmap_config
dt-bindings: regulator: ti,tps65132: document VIN supply
dt-bindings: mfd: twl: Fix example
regulator: Add Renesas RZ/G2L USB VBUS regulator driver
regulator: core: Add helper for allow HW access to enable/disable regulator
regulator: Add bindings for MediaTek DVFSRC Regulators
regulator: Add refactored mtk-dvfsrc-regulator driver
regulator: Remove mtk-dvfsrc-regulator.c
regulator: userspace-consumer: quiet device deferral
regulator: dt-bindings: mt6315: Document MT6319 PMIC
regulator: add missing MODULE_DESCRIPTION() macro
dt-bindings: regulator: twl-regulator: convert to yaml
regulator: dt-bindings: describe the PMU module of the WCN7850 package
regulator: dt-bindings: describe the PMU module of the QCA6390 package
regulator: dt-bindings: rtq2208: Add specified fixed LDO VOUT property
regulator: rtq2208: Add fixed LDO VOUT property and check that matches the constraints
...
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The interrupt is optional in hardware and not connected on
some boards. Make it optional in the binding.
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Link: https://patch.msgid.link/20240708084107.38986-3-frieder@fris.de
Signed-off-by: Mark Brown <broonie@kernel.org>
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Convert the Spreadtrum SC2731 regulator bindings to DT schema.
Change during conversion:
- switch compatible from sprd,sc27xx-regulator to sprd,sc2731-regulator,
same as the only in-tree user has done back in 2019 [1]
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/arch/arm64/boot/dts/sprd/sc2731.dtsi?h=v6.9&id=0419a75b1808dda225b17ba1509f195f23c0db88
Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/ZobxoobZvA8k3pyi@standask-GA-A55M-S2HP
Signed-off-by: Mark Brown <broonie@kernel.org>
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TPS65132 is powered by its VIN supply, document it.
Signed-off-by: Stanislav Jakubek <stano.jakubek@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/ZoWxnEY944ht2EWf@standask-GA-A55M-S2HP
Signed-off-by: Mark Brown <broonie@kernel.org>
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Fix example to also conform to rules specified in the separate
not-included gpadc binding.
Fixes: 62e4f3396197 ("dt-bindings: regulator: twl-regulator: convert to yaml")
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reported-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Lee Jones <lee@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20240612134039.1089839-1-andreas@kemnade.info
Signed-off-by: Mark Brown <broonie@kernel.org>
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Merge series from Biju Das <biju.das.jz@bp.renesas.com>:
As per RZ/G2L HW manual, VBUS enable can be controlled by the VBOUT bit of
the VBUS Control Register(VBENCTL) register in the USBPHY Control. But
this IP is in the Reset block.
Reset driver exposes this register as regmap and instantiate the USB VBUS
regulator device. Consumers(phy device) can use regulator APIs to control
VBUS as controlling is done in the atomic context using a new API which
is added for the purpose.
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Add a helper function that allow regulator consumers to allow low-level
HW access, in order to enable/disable regulator in atomic context.
The use-case for RZ/G2L SoC is to enable VBUS selection register based
on vbus detection that happens in interrupt context.
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://patch.msgid.link/20240616105402.45211-4-biju.das.jz@bp.renesas.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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The Dynamic Voltage and Frequency Scaling Resource Collector Regulators
are controlled with votes to the DVFSRC hardware.
This adds support for the regulators found in MT6873, MT8183, MT8192
and MT8195 SoCs.
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patch.msgid.link/20240610085735.147134-2-angelogioacchino.delregno@collabora.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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There are fixes for kselftest with clang that really help my CI.
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The MT6319 is a pin-compatible drop-in replacement for MT6315 with
slightly better electrical characteristics.
It's unclear whether there are any differences, since the downstream
implementation doesn't describe the MT6319 separately. Neither does the
implementation check chip IDs, even though those are available.
Add a new compatible for the MT6319 just in case differences are
discovered later and fall back to the MT6315 compatible.
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://patch.msgid.link/20240620094746.2404753-2-wenst@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>
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Convert the regulator bindings to yaml.
Drop one twl5030 compatible due to no documentation on mfd side and no
users of the twl5030.
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240606111611.371463-1-andreas@kemnade.info
Signed-off-by: Mark Brown <broonie@kernel.org>
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The WCN7850 package contains discrete modules for WLAN and Bluetooth. They
are powered by the Power Management Unit (PMU) that takes inputs from the
host and provides LDO outputs. Extend the bindings for QCA6390 to also
document this model.
Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://msgid.link/r/20240605121450.23697-3-brgl@bgdev.pl
Signed-off-by: Mark Brown <broonie@kernel.org>
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The QCA6390 package contains discrete modules for WLAN and Bluetooth. They
are powered by the Power Management Unit (PMU) that takes inputs from the
host and provides LDO outputs. This document describes this module.
Acked-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://msgid.link/r/20240605121450.23697-2-brgl@bgdev.pl
Signed-off-by: Mark Brown <broonie@kernel.org>
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We need these to get the i.MX8 boards working in CI again.
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Merge series from Alina Yu <alina_yu@richtek.com>:
There are two types of LDO VOUT: fixed voltage mode and adjustable voltage mode.
As the fixed voltage for the LDO is outside the range of the adjustable voltage mode,
the constraints for this scenario are not suitable to represent both modes.
Therefore, A property is added to specify the fixed LDO VOUT.
In this version, a software bug has been fixed.
rtq2208_ldo_match is no longer a local variable.
It prevents invalid memory access when devm_of_regulator_put_matches is called.
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As the fixed voltage for the LDO is outside the range of the adjustable voltage mode,
the constraints for this scenario are not suitable to represent both modes.
Therefore, A property is added to specify the fixed LDO VOUT.
Examples of fixed LDO VOUT and adjustable LDO VOUT is also added to this version.
Signed-off-by: Alina Yu <alina_yu@richtek.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/c6cb218f6338291525a29ed89a88a42c175127ad.1716870419.git.alina_yu@richtek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
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Add new compatible "st,stm32mp13-pwr-reg" for STM32MP13 SoC family.
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://msgid.link/r/20240523200353.v4.1.Ia0a99d90acb512aa020a6e7a8cca8cc1b71f1759@changeid
Signed-off-by: Mark Brown <broonie@kernel.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux
Pull gpio updates from Bartosz Golaszewski:
"The majority of added lines are two new modules: the GPIO virtual
consumer module that improves our ability to add automated tests for
the kernel API and the "sloppy" logic analyzer module that uses the
GPIO API to implement a coarse-grained debugging tool for useful for
remote development.
Other than that we have the usual assortment of various driver
extensions, improvements to the core GPIO code, DT-bindings and other
documentation updates as well as an extension to the interrupt
simulator:
GPIOLIB core:
- rework kfifo handling rework in the character device code
- improve the labeling of GPIOs requested as interrupts and show more
info on interrupt-only GPIOs in debugfs
- remove unused APIs
- unexport interfaces that are only used from the core GPIO code
- drop the return value from gpiochip_set_desc_names() as it cannot
fail
- move a string array definition out of a header and into a specific
compilation unit
- convert the last user of gpiochip_get_desc() other than GPIO core
to using a safer alternative
- use array_index_nospec() where applicable
New drivers:
- add a "virtual GPIO consumer" module that allows requesting GPIOs
from actual hardware and driving tests of the in-kernel GPIO API
from user-space over debugfs
- add a GPIO-based "sloppy" logic analyzer module useful for "first
glance" debugging on remote boards
Driver improvements:
- add support for a new model to gpio-pca953x
- lock GPIOs as interrupts in gpio-sim when the lines are requested
as irqs via the simulator domain + some other minor improvements
- improve error reporting in gpio-syscon
- convert gpio-ath79 to using dynamic GPIO base and range
- use pcibios_err_to_errno() for converting PCIBIOS error codes to
errno vaues in gpio-amd8111 and gpio-rdc321x
- allow building gpio-brcmstb for the BCM2835 architecture
DT bindings:
- convert DT bindings for lsi,zevio, mpc8xxx, and atmel to DT schema
- document new properties for aspeed,gpio, fsl,qoriq-gpio and
gpio-vf610
- document new compatibles for pca953x and fsl,qoriq-gpio
Documentation:
- document stricter behavior of the GPIO character device uAPI with
regards to reconfiguring requested line without direction set
- clarify the effect of the active-low flag on line values and edges
- remove documentation for the legacy GPIO API in order to stop
tempting people to use it
- document the preference for using pread() for reading edge events
in the sysfs API
Other:
- add an extended initializer to the interrupt simulator allowing to
specify a number of callbacks callers can use to be notified about
irqs being requested and released"
* tag 'gpio-updates-for-v6.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux: (41 commits)
gpio: mc33880: Convert comma to semicolon
gpio: virtuser: actually use the "trimmed" local variable
dt-bindings: gpio: convert Atmel GPIO to json-schema
gpio: virtuser: new virtual testing driver for the GPIO API
dt-bindings: gpio: vf610: Allow gpio-line-names to be set
gpio: sim: lock GPIOs as interrupts when they are requested
genirq/irq_sim: add an extended irq_sim initializer
dt-bindings: gpio: fsl,qoriq-gpio: Add compatible string fsl,ls1046a-gpio
gpiolib: unexport gpiochip_get_desc()
gpio: add sloppy logic analyzer using polling
Documentation: gpio: Reconfiguration with unset direction (uAPI v2)
Documentation: gpio: Reconfiguration with unset direction (uAPI v1)
dt-bindings: gpio: fsl,qoriq-gpio: add common property gpio-line-names
gpio: ath79: convert to dynamic GPIO base allocation
pinctrl: da9062: replace gpiochip_get_desc() with gpio_device_get_desc()
gpiolib: put gpio_suffixes in a single compilation unit
Documentation: gpio: Clarify effect of active low flag on line edges
Documentation: gpio: Clarify effect of active low flag on line values
gpiolib: Remove data-less gpiochip_add() function
gpio: sim: use devm_mutex_init()
...
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Convert the Atmel GPIO controller binding document to DT schema format
using json-schema.
The at91 pinctrl driver uses "atmel,at91rm9200-gpio" compatible string
to find the number of active GPIO banks and identify the pinmux nodes.
"atmel,at91sam9x5-gpio" and "microchip,sam9x60-gpio" have additional
registers to handle drive-strength, slew-rate, pull-down to drive the
pinmux configs.
The new compatible string "microchip,sam9x7-gpio" is added.
Signed-off-by: Manikandan Muralidharan <manikandan.m@microchip.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240709092354.191643-5-manikandan.m@microchip.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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The GPIO subsystem used to have a serious problem with undefined behavior
and use-after-free bugs on hot-unplug of GPIO chips. This can be
considered a corner-case by some as most GPIO controllers are enabled
early in the boot process and live until the system goes down but most
GPIO drivers do allow unbind over sysfs, many are loadable modules that
can be (force) unloaded and there are also GPIO devices that can be
dynamically detached, for instance CP2112 which is a USB GPIO expender.
Bugs can be triggered both from user-space as well as by in-kernel users.
We have the means of testing it from user-space via the character device
but the issues manifest themselves differently in the kernel.
This is a proposition of adding a new virtual driver - a configurable
GPIO consumer that can be configured over configfs (similarly to
gpio-sim) or described on the device-tree.
This driver is aimed as a helper in spotting any regressions in
hot-unplug handling in GPIOLIB.
Link: https://lore.kernel.org/r/20240708142912.120570-1-brgl@bgdev.pl
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Describe common "gpio-line-names" property to allow DTs to
specify names for GPIO lines.
Signed-off-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240708084107.38986-2-frieder@fris.de
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Add compatible string for chip ls1046 to fix below warning.
arch/arm64/boot/dts/freescale/fsl-ls1046a-frwy.dtb: /soc/gpio@2300000: failed to match any schema with compatible: ['fsl,ls1046a-gpio', 'fsl,qoriq-gpio']
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240702201724.96681-1-Frank.Li@nxp.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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This is a sloppy logic analyzer using GPIOs. It comes with a script to
isolate a CPU for polling. While this is definitely not a production
level analyzer, it can be a helpful first view when remote debugging.
Read the documentation for details.
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20240620094159.6785-2-wsa+renesas@sang-engineering.com
[Bartosz: moved the Kconfig entry into a different category]
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Update description of reconfiguration rules, adding requirement that a
direction flag be set to enable changing configuration for a line.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20240626052925.174272-5-warthog618@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Update description of reconfiguration rules, adding requirement that a
direction flag be set or the configuration is considered invalid.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20240626052925.174272-4-warthog618@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Add common gpio-line-names property for fsl,qoriq-gpio to fix below
warning.
arch/arm64/boot/dts/freescale/fsl-ls1028a-kontron-kbox-a-230-ls.dtb: gpio@2300000: 'gpio-line-names' does not match any of the regexes: 'pinctrl-[0-9]+'
from schema $id: http://devicetree.org/schemas/gpio/fsl,qoriq-gpio.yaml
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240627202151.456812-1-Frank.Li@nxp.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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The documentation does not make sufficiently clear that edge polarity is
based on changes to the logical line values, and that the physical
polarity of edges is dependent on the active low flag.
Clarify the relationship between the active low flag and edge polarity
for the functions that read edge events.
Suggested-by: David C. Rankin <drankinatty@gmail.com>
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20240610092157.9147-3-warthog618@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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The documentation does not make sufficiently clear that the uAPI deals with
logical line values, nor does it describe the influence of the active low
flag on the mapping between physical and logical line values.
Clarify the relationship between physical and logical line values and the
effect of the active low flag for ioctls passing line values.
Suggested-by: David C. Rankin <drankinatty@gmail.com>
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20240610092157.9147-2-warthog618@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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GPIO chips should be added with driver-private data associated with the
chip. If none is needed, NULL can be used. All users already do this
except one, fix that here. With no more users of the base gpiochip_add()
we can drop this function so no more users show up later.
Signed-off-by: Andrew Davis <afd@ti.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20240610135313.142571-1-afd@ti.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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In legacy sysfs GPIO, when using poll(2) on the sysfs GPIO value for
state change awaiting, a subsequent read(2) is required for consuming
the event, which the doc recommends the use of lseek(2) or
close-and-reopen to reset the file offset afterwards.
The recommendations however, require at least 2 syscalls to consume
the event. Gladly, use of pread(2) require only 1 syscall for the
consumption. Let's advertise this usage by prioritizing its placement.
Signed-off-by: Huichun Feng <foxhoundsk.tw@gmail.com>
Link: https://lore.kernel.org/r/20240609173728.2950808-1-foxhoundsk.tw@gmail.com
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Squash warnings such as:
arch/arm/boot/dts/aspeed/aspeed-ast2500-evb.dtb: sgpio@1e780200: '#interrupt-cells' does not match any of the regexes: 'pinctrl-[0-9]+'
Also, mark #interrupt-cells as required. The kernel devicetrees already
specified it where compatible nodes were defined, and u-boot pulls in
the kernel devicetrees, so this should have minimal practical impact.
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240530-dt-warnings-gpio-sgpio-interrupt-cells-v2-2-912cd16e641f@codeconstruct.com.au
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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Some devicetrees specify gpio-line-names in the sgpio node despite it
not being defined by the binding. It's a reasonable thing to do, so
define the property to squash warnings such as:
arch/arm/boot/dts/aspeed/aspeed-bmc-vegman-rx20.dtb: sgpio@1e780200: 'gpio-line-names' does not match any of the regexes: 'pinctrl-[0-9]+'
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Link: https://lore.kernel.org/r/20240530-dt-warnings-gpio-sgpio-interrupt-cells-v2-1-912cd16e641f@codeconstruct.com.au
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
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