[PATCH v2 1/4] i2c: check bus number property in DesignWare I2C Controller
From: Paweł Anikiel <hidden>
Date: 2021-10-05 14:38:17
Also in:
linux-arm-kernel, linux-i2c, lkml
Subsystem:
i2c subsystem, i2c subsystem host drivers, synopsys designware i2c driver, the rest · Maintainers:
Wolfram Sang, Andi Shyti, Mika Westerberg, Linus Torvalds
On SoCFPGA systems, it's desireable to have fixed numbering for i2c busses, while being able to enable/disable them (e.g. have i2c1 be mapped to /dev/i2c-1, even though i2c0 is disabled). This can also be achieved using devicetree aliases (see i2c_add_adapter). However, having the driver be self-contained without relying on aliases is more robust. Signed-off-by: Paweł Anikiel <redacted> --- drivers/i2c/busses/i2c-designware-platdrv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c
index 21113665ddea..f27e6bc9ad9d 100644
--- a/drivers/i2c/busses/i2c-designware-platdrv.c
+++ b/drivers/i2c/busses/i2c-designware-platdrv.c@@ -280,7 +280,8 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) I2C_CLASS_HWMON : I2C_CLASS_DEPRECATED; ACPI_COMPANION_SET(&adap->dev, ACPI_COMPANION(&pdev->dev)); adap->dev.of_node = pdev->dev.of_node; - adap->nr = -1; + if (of_property_read_u32(pdev->dev.of_node, "busno", &adap->nr)) + adap->nr = -1; if (dev->flags & ACCESS_NO_IRQ_SUSPEND) { dev_pm_set_driver_flags(&pdev->dev,
--
2.25.1