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gpio: mpc8xxx: latch GPIOs state on module load when configured as output 

Qoriq and related devices allow reading out state of GPIO set as output.
However, currently on driver's init, all outputs are configured as driven
low. So, any changes to GPIO confiuration will drive all pins (configured
as output) as output-low.
This patch latches state of output GPIOs before any GPIO configuration
takes place. This preserves any output settings done prior to loading
the driver (for example, by u-boot).

Signed-off-by: Michal Smulski <michal.smulski@ooma.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
This commit is contained in:
Michal Smulski 2023-06-01 16:02:00 -07:00 committed by Bartosz Golaszewski
parent 61c65a8b50
commit 19b60f8410
1 changed files with 5 additions and 1 deletions
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6
drivers/gpio/gpio-mpc8xxx.c
View File

@ -375,8 +375,12 @@ static int mpc8xxx_probe(struct platform_device *pdev)
if (of_device_is_compatible(np, "fsl,qoriq-gpio") ||
of_device_is_compatible(np, "fsl,ls1028a-gpio") ||
of_device_is_compatible(np, "fsl,ls1088a-gpio") ||
is_acpi_node(fwnode))
is_acpi_node(fwnode)) {
gc->write_reg(mpc8xxx_gc->regs + GPIO_IBE, 0xffffffff);
/* Also, latch state of GPIOs configured as output by bootloader. */
gc->bgpio_data = gc->read_reg(mpc8xxx_gc->regs + GPIO_DAT) &
gc->read_reg(mpc8xxx_gc->regs + GPIO_DIR);
}
ret = devm_gpiochip_add_data(&pdev->dev, gc, mpc8xxx_gc);
if (ret) {