From 1e91a2e5d827e643cbabad66d133f155a7fcb0de Mon Sep 17 00:00:00 2001 From: Ruslan Babayev Date: Tue, 28 May 2019 16:02:32 -0700 Subject: i2c: acpi: export i2c_acpi_find_adapter_by_handle This allows drivers to lookup i2c adapters on ACPI based systems similar to of_get_i2c_adapter_by_node() with DT based systems. Signed-off-by: Ruslan Babayev Cc: xe-linux-external@cisco.com Reviewed-by: Andrew Lunn Signed-off-by: David S. Miller --- drivers/i2c/i2c-core-acpi.c | 3 ++- include/linux/i2c.h | 6 ++++++ 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c index 272800692088..964687534754 100644 --- a/drivers/i2c/i2c-core-acpi.c +++ b/drivers/i2c/i2c-core-acpi.c @@ -337,7 +337,7 @@ static int i2c_acpi_find_match_device(struct device *dev, void *data) return ACPI_COMPANION(dev) == data; } -static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) +struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) { struct device *dev; @@ -345,6 +345,7 @@ static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) i2c_acpi_find_match_adapter); return dev ? i2c_verify_adapter(dev) : NULL; } +EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle); static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev) { diff --git a/include/linux/i2c.h b/include/linux/i2c.h index 1308126fc384..e982b8913b73 100644 --- a/include/linux/i2c.h +++ b/include/linux/i2c.h @@ -14,6 +14,7 @@ #ifndef _LINUX_I2C_H #define _LINUX_I2C_H +#include /* for acpi_handle */ #include #include /* for struct device */ #include /* for completion */ @@ -981,6 +982,7 @@ bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, u32 i2c_acpi_find_bus_speed(struct device *dev); struct i2c_client *i2c_acpi_new_device(struct device *dev, int index, struct i2c_board_info *info); +struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle); #else static inline bool i2c_acpi_get_i2c_resource(struct acpi_resource *ares, struct acpi_resource_i2c_serialbus **i2c) @@ -996,6 +998,10 @@ static inline struct i2c_client *i2c_acpi_new_device(struct device *dev, { return NULL; } +static inline struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle) +{ + return NULL; +} #endif /* CONFIG_ACPI */ #endif /* _LINUX_I2C_H */ -- cgit v1.2.3 From 7ce236fafd0b4e279abf3e8b15ba9ad3e49d1440 Mon Sep 17 00:00:00 2001 From: Ruslan Babayev Date: Tue, 28 May 2019 16:02:33 -0700 Subject: net: phy: sfp: enable i2c-bus detection on ACPI based systems Lookup I2C adapter using the "i2c-bus" device property on ACPI based systems similar to how it's done with DT. An example DSD describing an SFP on an ACPI based system: Device (SFP0) { Name (_HID, "PRP0001") Name (_CRS, ResourceTemplate() { GpioIo(Exclusive, PullDefault, 0, 0, IoRestrictionNone, "\\_SB.PCI0.RP01.GPIO", 0, ResourceConsumer) { 0, 1, 2, 3, 4 } }) Name (_DSD, Package () { ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), Package () { Package () { "compatible", "sff,sfp" }, Package () { "i2c-bus", \_SB.PCI0.RP01.I2C.MUX.CH0 }, Package () { "maximum-power-milliwatt", 1000 }, Package () { "tx-disable-gpios", Package () { ^SFP0, 0, 0, 1} }, Package () { "reset-gpio", Package () { ^SFP0, 0, 1, 1} }, Package () { "mod-def0-gpios", Package () { ^SFP0, 0, 2, 1} }, Package () { "tx-fault-gpios", Package () { ^SFP0, 0, 3, 0} }, Package () { "los-gpios", Package () { ^SFP0, 0, 4, 1} }, }, }) } Device (PHY0) { Name (_HID, "PRP0001") Name (_DSD, Package () { ToUUID ("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"), Package () { Package () { "compatible", "ethernet-phy-ieee802.3-c45" }, Package () { "sfp", \_SB.PCI0.RP01.SFP0 }, Package () { "managed", "in-band-status" }, Package () { "phy-mode", "sgmii" }, }, }) } Signed-off-by: Ruslan Babayev Cc: xe-linux-external@cisco.com Acked-by: Russell King Reviewed-by: Andrew Lunn Signed-off-by: David S. Miller --- drivers/net/phy/sfp.c | 35 +++++++++++++++++++++++++++-------- 1 file changed, 27 insertions(+), 8 deletions(-) diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c index d4635c2178d1..554acc869c25 100644 --- a/drivers/net/phy/sfp.c +++ b/drivers/net/phy/sfp.c @@ -1,4 +1,5 @@ // SPDX-License-Identifier: GPL-2.0 +#include #include #include #include @@ -1782,6 +1783,7 @@ static void sfp_cleanup(void *data) static int sfp_probe(struct platform_device *pdev) { const struct sff_data *sff; + struct i2c_adapter *i2c; struct sfp *sfp; bool poll = false; int irq, err, i; @@ -1801,7 +1803,6 @@ static int sfp_probe(struct platform_device *pdev) if (pdev->dev.of_node) { struct device_node *node = pdev->dev.of_node; const struct of_device_id *id; - struct i2c_adapter *i2c; struct device_node *np; id = of_match_node(sfp_of_match, node); @@ -1818,14 +1819,32 @@ static int sfp_probe(struct platform_device *pdev) i2c = of_find_i2c_adapter_by_node(np); of_node_put(np); - if (!i2c) - return -EPROBE_DEFER; - - err = sfp_i2c_configure(sfp, i2c); - if (err < 0) { - i2c_put_adapter(i2c); - return err; + } else if (has_acpi_companion(&pdev->dev)) { + struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); + struct fwnode_handle *fw = acpi_fwnode_handle(adev); + struct fwnode_reference_args args; + struct acpi_handle *acpi_handle; + int ret; + + ret = acpi_node_get_property_reference(fw, "i2c-bus", 0, &args); + if (ACPI_FAILURE(ret) || !is_acpi_device_node(args.fwnode)) { + dev_err(&pdev->dev, "missing 'i2c-bus' property\n"); + return -ENODEV; } + + acpi_handle = ACPI_HANDLE_FWNODE(args.fwnode); + i2c = i2c_acpi_find_adapter_by_handle(acpi_handle); + } else { + return -EINVAL; + } + + if (!i2c) + return -EPROBE_DEFER; + + err = sfp_i2c_configure(sfp, i2c); + if (err < 0) { + i2c_put_adapter(i2c); + return err; } for (i = 0; i < GPIO_MAX; i++) -- cgit v1.2.3