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SubjectRe: [PATCH] gpio: davinci: fix gpio selection for OF
On 03/05/2014 12:06 AM, Alexander Holler wrote:
> 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 of the existing code in gpio-pxa.
>
> Signed-off-by: Alexander Holler <holler@ahsoftware.de>
> ---
> drivers/gpio/gpio-davinci.c | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/drivers/gpio/gpio-davinci.c b/drivers/gpio/gpio-davinci.c
> index 7629b4f..79f45c4 100644
> --- a/drivers/gpio/gpio-davinci.c
> +++ b/drivers/gpio/gpio-davinci.c
> @@ -44,6 +44,9 @@ struct davinci_gpio_regs {
>
> static void __iomem *gpio_base;
>
> +static struct davinci_gpio_controller *davinci_gpio_chips;
> +static int davinci_last_gpio;
> +
> static struct davinci_gpio_regs __iomem *gpio2regs(unsigned gpio)
> {
> void __iomem *ptr;
> @@ -172,6 +175,24 @@ 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)
> +{
> + if (gpiospec->args[0] > davinci_last_gpio)
> + return -EINVAL;
> +
> + if (gc != &davinci_gpio_chips[gpiospec->args[0] / 32].chip)
> + return -EINVAL;
> +
> + if (flags)
> + *flags = gpiospec->args[1];

Just one question here - Could we use gpio_chip-dev and hence, drop
static variables (davinci_gpio_chips, davinci_last_gpio)?

The Davinci device holds davinci_gpio_platform_data
in dev->platform_data and pointer on davinci_gpio_controller array
in dev->p->driver_data.

And looks like, dev_get_platdata(gc->dev) and
dev_get_drvdata(gc->dev) can be used here.

> +
> + return gpiospec->args[0] % 32;
> +}
> +#endif
> +
> static int davinci_gpio_probe(struct platform_device *pdev)
> {
> int i, base;
> @@ -236,6 +257,8 @@ static int davinci_gpio_probe(struct platform_device *pdev)
> chips[i].chip.ngpio = 32;
>

add here chips[i].chip.dev = dev;

> #ifdef CONFIG_OF_GPIO
> + chips[i].chip.of_gpio_n_cells = 2;
> + chips[i].chip.of_xlate = davinci_gpio_of_xlate;
> chips[i].chip.of_node = dev->of_node;
> #endif
> spin_lock_init(&chips[i].lock);
> @@ -251,6 +274,10 @@ static int davinci_gpio_probe(struct platform_device *pdev)
>
> platform_set_drvdata(pdev, chips);
> davinci_gpio_irq_setup(pdev);
> +
> + davinci_gpio_chips = chips;
> + davinci_last_gpio = ngpio;
> +
> return 0;
> }

regards,
-grygorii




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