From 758afe429c501924ac650ad667fd79f4bb06c05a Mon Sep 17 00:00:00 2001 From: Alexander Holler Date: Wed, 5 Mar 2014 12:21:01 +0100 Subject: [PATCH] gpio: davinci: fix gpio selection for OF The driver missed an of_xlate function to translate gpio numbers as found in the DT to the correct chip and number. While there I've set #gpio_cells to a fixed value of 2. I've used gpio-pxa.c as template for those changes and tested my changes successfully on a da850 board using entries for gpio-leds in a DT. So I didn't reinvent the wheel but just copied and tested stuff. Thanks to Grygorii Strashko for the hint to the existing code in gpio-pxa. Signed-off-by: Alexander Holler Signed-off-by: Grygorii Strashko Signed-off-by: Linus Walleij --- drivers/gpio/gpio-davinci.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c index 52470382a964..339f9dac591b 100644 --- a/drivers/gpio/gpio-davinci.c +++ b/drivers/gpio/gpio-davinci.c @@ -174,6 +174,27 @@ of_err: return NULL; } +#ifdef CONFIG_OF_GPIO +static int davinci_gpio_of_xlate(struct gpio_chip *gc, + const struct of_phandle_args *gpiospec, + u32 *flags) +{ + struct davinci_gpio_controller *chips = dev_get_drvdata(gc->dev); + struct davinci_gpio_platform_data *pdata = dev_get_platdata(gc->dev); + + if (gpiospec->args[0] > pdata->ngpio) + return -EINVAL; + + if (gc != &chips[gpiospec->args[0] / 32].chip) + return -EINVAL; + + if (flags) + *flags = gpiospec->args[1]; + + return gpiospec->args[0] % 32; +} +#endif + static int davinci_gpio_probe(struct platform_device *pdev) { int i, base; @@ -238,6 +259,9 @@ static int davinci_gpio_probe(struct platform_device *pdev) chips[i].chip.ngpio = 32; #ifdef CONFIG_OF_GPIO + chips[i].chip.of_gpio_n_cells = 2; + chips[i].chip.of_xlate = davinci_gpio_of_xlate; + chips[i].chip.dev = dev; chips[i].chip.of_node = dev->of_node; #endif spin_lock_init(&chips[i].lock); -- 2.34.1