gpio/rockchip: fetch deferred output settings on probe

Fetch the output settings the pinctrl driver may have created
for pinctrl hogs and set the relevant pins as requested.

Fixes: 9ce9a02039de ("pinctrl/rockchip: drop the gpio related codes")
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://lore.kernel.org/r/20210913224926.1260726-5-heiko@sntech.de
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/gpio/gpio-rockchip.c b/drivers/gpio/gpio-rockchip.c
index 036b2d9..d67c64a 100644 (file)
--- a/drivers/gpio/gpio-rockchip.c
+++ b/drivers/gpio/gpio-rockchip.c
@@ -689,6 +689,7 @@ static int rockchip_gpio_probe(struct platform_device *pdev)
        struct device_node *pctlnp = of_get_parent(np);
        struct pinctrl_dev *pctldev = NULL;
        struct rockchip_pin_bank *bank = NULL;
+       struct rockchip_pin_output_deferred *cfg;
        static int gpio;
        int id, ret;
 
@@ -716,12 +717,33 @@ static int rockchip_gpio_probe(struct platform_device *pdev)
        if (ret)
                return ret;
 
+       /*
+        * Prevent clashes with a deferred output setting
+        * being added right at this moment.
+        */
+       mutex_lock(&bank->deferred_lock);
+
        ret = rockchip_gpiolib_register(bank);
        if (ret) {
                clk_disable_unprepare(bank->clk);
+               mutex_unlock(&bank->deferred_lock);
                return ret;
        }
 
+       while (!list_empty(&bank->deferred_output)) {
+               cfg = list_first_entry(&bank->deferred_output,
+                                      struct rockchip_pin_output_deferred, head);
+               list_del(&cfg->head);
+
+               ret = rockchip_gpio_direction_output(&bank->gpio_chip, cfg->pin, cfg->arg);
+               if (ret)
+                       dev_warn(dev, "setting output pin %u to %u failed\n", cfg->pin, cfg->arg);
+
+               kfree(cfg);
+       }
+
+       mutex_unlock(&bank->deferred_lock);
+
        platform_set_drvdata(pdev, bank);
        dev_info(dev, "probed %pOF\n", np);