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SubjectRe: [RESEND PATCH] pinctrl: rockchip: add support the get_direction
Date
Hi Caesar,

Am Montag, 14. März 2016, 14:01:19 schrieb Caesar Wang:
> This patch adds the get_direction to support the gpio
> interface.
>
> The gpio direction is not used on rockchip platform when use the gpio
> debugfs.
>
> Tested on kylin board. (RK3036 SoCs)
> The repro steps:
> $/sys/class/gpio/
> echo 53 > export
> $/sys/class/gpio/gpio53# cat direction
> in
> In general, the gpio53 should be out value, but the direction is the
> default value 'in', since the get_direction didn't supported in rockchip
> pinctrl.
>
> So, we should add this patch to support it.
>
> Reported-by: Jeffy Chen <jeffy.chen@rock-chips.com>
> Signed-off-by: Caesar Wang <wxt@rock-chips.com>
> Cc: Linus Walleij <linus.walleij@linaro.org>
> Cc: Heiko Stuebner <heiko@sntech.de>
> Cc: linux-gpio@vger.kernel.org
> Cc: linux-rockchip@lists.infradead.org
>
> ---
>
> Changes in RESEND:
> - Remove the change-id
>
> drivers/pinctrl/pinctrl-rockchip.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
> diff --git a/drivers/pinctrl/pinctrl-rockchip.c
> b/drivers/pinctrl/pinctrl-rockchip.c index bf032b9..f22a186 100644
> --- a/drivers/pinctrl/pinctrl-rockchip.c
> +++ b/drivers/pinctrl/pinctrl-rockchip.c
> @@ -1208,6 +1208,18 @@ static int rockchip_pmx_set(struct pinctrl_dev
> *pctldev, unsigned selector, return 0;
> }
>
> +static int rockchip_gpio_get_direction(struct gpio_chip *chip, unsigned
> offset) +{
> + struct rockchip_pin_bank *bank = gpiochip_get_data(chip);
> + int pin;
> + u32 data;
> +
> + pin = offset - chip->base;
> + data = readl_relaxed(bank->reg_base + GPIO_SWPORT_DDR);
> +
> + return !!(data & BIT(pin));

TRM (at least rk3288 and rk3036) says for the SWPORT_DDR register:
(data & BIT(pin)) = 0 = input
(data & BIT(pin)) = 1 = output

struct gpio_chip docs [0] says:
@get_direction: returns 0=out, 1=in,


So shouldn't that be
return !(data & BIT(pin));
with only one "!" instead of two?
Or as happens sometimes, am I just blind? :-)


Thanks
Heiko

[0] http://lxr.free-electrons.com/source/include/linux/gpio/driver.h#L33

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