pinctrl: rockchip: add pinmux_ops.gpio_set_direction callback

BugLink: https://bugs.launchpad.net/bugs/1996825
commit 4635c0e2a7f7f3568cbfccae70121f9835efa62c upstream.

Before the split of gpio and pinctrl sections in their own driver,
rockchip_set_mux was called in pinmux_ops.gpio_set_direction for
configuring a pin in its GPIO function.

This is essential for cases where pinctrl is "bypassed" by gpio
consumers otherwise the GPIO function is not configured for the pin and
it does not work. Such was the case for the sysfs/libgpiod userspace
GPIO handling.

Let's re-implement the pinmux_ops.gpio_set_direction callback so that
the gpio subsystem can request from the pinctrl driver to put the pin in
its GPIO function.

Fixes: 9ce9a02039de ("pinctrl/rockchip: drop the gpio related codes")
Cc: stable@vger.kernel.org
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Link: https://lore.kernel.org/r/20220930132033.4003377-2-foss+kernel@0leil.net
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

diff --git a/drivers/pinctrl/pinctrl-rockchip.c b/drivers/pinctrl/pinctrl-rockchip.c
index 350e721c4658ca3ee6c6a3614026c28338b2fefa..bae6cc83ea36296c7252baa2a1022b264827f989 100644 (file)
--- a/drivers/pinctrl/pinctrl-rockchip.c
+++ b/drivers/pinctrl/pinctrl-rockchip.c
@@ -2072,11 +2072,24 @@ static int rockchip_pmx_set(struct pinctrl_dev *pctldev, unsigned selector,
        return 0;
 }
 
+static int rockchip_pmx_gpio_set_direction(struct pinctrl_dev *pctldev,
+                                          struct pinctrl_gpio_range *range,
+                                          unsigned offset,
+                                          bool input)
+{
+       struct rockchip_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
+       struct rockchip_pin_bank *bank;
+
+       bank = pin_to_bank(info, offset);
+       return rockchip_set_mux(bank, offset - bank->pin_base, RK_FUNC_GPIO);
+}
+
 static const struct pinmux_ops rockchip_pmx_ops = {
        .get_functions_count    = rockchip_pmx_get_funcs_count,
        .get_function_name      = rockchip_pmx_get_func_name,
        .get_function_groups    = rockchip_pmx_get_groups,
        .set_mux                = rockchip_pmx_set,
+       .gpio_set_direction     = rockchip_pmx_gpio_set_direction,
 };
 
 /*