[PATCH 4/7] pinctrl: airoha: mux a requested GPIO through the IOMUX

[John Crispin <john@phrozen.org>]

On a SoC with an IOMUX block every pin turns into a GPIO with one mode
value, mode 0 on the AN7589. Add that value to struct
airoha_pinctrl_iomux and write it when gpiolib requests a pin, so no
SoC needs a gpio function with one group per pin.

Without an IOMUX the callback does nothing, so the existing SoCs keep
their explicit gpio functions and their behavior.

Signed-off-by: John Crispin <john@phrozen.org>
---
 drivers/pinctrl/airoha/airoha-common.h  |  1 +
 drivers/pinctrl/airoha/pinctrl-airoha.c | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/pinctrl/airoha/airoha-common.h b/drivers/pinctrl/airoha/airoha-common.h
index 7a0cb8924e71..adfce89493f0 100644
--- a/drivers/pinctrl/airoha/airoha-common.h
+++ b/drivers/pinctrl/airoha/airoha-common.h
@@ -111,6 +111,7 @@ extern const struct airoha_gpiochip_regs airoha_gpiochip_regs_64;
 
 struct airoha_pinctrl_iomux {
 	u8 mode_bits;
+	u8 gpio_mode;
 };
 
 struct airoha_pinctrl_confs_info {
diff --git a/drivers/pinctrl/airoha/pinctrl-airoha.c b/drivers/pinctrl/airoha/pinctrl-airoha.c
index 9116d3ded258..a805f542bc7b 100644
--- a/drivers/pinctrl/airoha/pinctrl-airoha.c
+++ b/drivers/pinctrl/airoha/pinctrl-airoha.c
@@ -430,6 +430,19 @@ static int airoha_pinmux_set_pin_modes(struct airoha_pinctrl *pinctrl,
 	return 0;
 }
 
+static int airoha_pinmux_gpio_request_enable(struct pinctrl_dev *pctrl_dev,
+					     struct pinctrl_gpio_range *range,
+					     unsigned int pin)
+{
+	struct airoha_pinctrl *pinctrl = pinctrl_dev_get_drvdata(pctrl_dev);
+
+	if (!pinctrl->iomux_info)
+		return 0;
+
+	return airoha_pinmux_set_pin_mode(pinctrl, pin,
+					  pinctrl->iomux_info->gpio_mode);
+}
+
 static int airoha_pinmux_set_mux(struct pinctrl_dev *pctrl_dev,
 				 unsigned int selector,
 				 unsigned int group)
@@ -510,6 +523,7 @@ static const struct pinmux_ops airoha_pmxops = {
 	.get_functions_count = pinmux_generic_get_function_count,
 	.get_function_name = pinmux_generic_get_function_name,
 	.get_function_groups = pinmux_generic_get_function_groups,
+	.gpio_request_enable = airoha_pinmux_gpio_request_enable,
 	.gpio_set_direction = airoha_pinmux_set_direction,
 	.set_mux = airoha_pinmux_set_mux,
 	.strict = true,
-- 
2.34.1