diff options
| author |   Ruslan Babayev <ruslan@babayev.com> | 2019-05-28 16:02:33 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-05-30 11:27:47 -0700 |
| commit | 7ce236fafd0b4e279abf3e8b15ba9ad3e49d1440 (patch) | |
| tree | 094c96a73b79de2cc982c4209b5b865c21429bb5 /drivers/net/phy | |
| parent | i2c: acpi: export i2c_acpi_find_adapter_by_handle (diff) | |
| download | linux-dev-7ce236fafd0b4e279abf3e8b15ba9ad3e49d1440.tar.xz linux-dev-7ce236fafd0b4e279abf3e8b15ba9ad3e49d1440.zip | |
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 <ruslan@babayev.com>
Cc: xe-linux-external@cisco.com
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/phy')
| -rw-r--r-- | drivers/net/phy/sfp.c | 35 |
1 files 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 <linux/acpi.h> #include <linux/ctype.h> #include <linux/delay.h> #include <linux/gpio/consumer.h> @@ -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++) |