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    Subject[PATCH v2 3/4] gpio: exynos4: skip gpiolib registration if pinctrl driver is used
    Date
    Pinctrl driver, when enabled, registers all the gpio pins and hence the
    registration of gpio pins by this driver can be skipped.

    Acked-by: Grant Likely <grant.likely@secretlab.ca>
    Acked-by: Linus Walleij <linus.walleij@linaro.org>
    Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org>
    ---
    drivers/gpio/gpio-samsung.c | 21 +++++++++++++++++++++
    1 files changed, 21 insertions(+), 0 deletions(-)

    diff --git a/drivers/gpio/gpio-samsung.c b/drivers/gpio/gpio-samsung.c
    index 92f7b2b..8e61053 100644
    --- a/drivers/gpio/gpio-samsung.c
    +++ b/drivers/gpio/gpio-samsung.c
    @@ -2734,6 +2734,27 @@ static __init void exynos4_gpiolib_init(void)
    int group = 0;
    void __iomem *gpx_base;

    +#ifdef CONFIG_OF
    + /*
    + * This gpio driver includes support for device tree support and
    + * there are platforms using it. In order to maintain
    + * compatibility with those platforms, and to allow non-dt
    + * Exynos4210 platforms to use this gpiolib support, a check
    + * is added to find out if there is a active pin-controller
    + * driver support available. If it is available, this gpiolib
    + * support is ignored and the gpiolib support available in
    + * pin-controller driver is used. This is a temporary check and
    + * will go away when all of the Exynos4210 platforms have
    + * switched to using device tree and the pin-ctrl driver.
    + */
    + struct device_node *pctrl_np;
    + const char *pctrl_compat = "samsung,pinctrl-exynos4210";
    + pctrl_np = of_find_compatible_node(NULL, NULL, pctrl_compat);
    + if (pctrl_np)
    + if (of_device_is_available(pctrl_np))
    + return -ENODEV;
    +#endif
    +
    /* gpio part1 */
    gpio_base1 = ioremap(EXYNOS4_PA_GPIO1, SZ_4K);
    if (gpio_base1 == NULL) {
    --
    1.6.6.rc2


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