[PATCH 11/11] pinctrl: scmi: select the GPIO function on GPIO requests

[Clément Le Goffic]

On a GPIO request, select the GPIO function of the pin, on the pin for a
pin-only function or on its single-pin group. Without a GPIO function the
mux is left as it is.

Signed-off-by: Clément Le Goffic <clegoffic at baylibre.com>
---
 drivers/pinctrl/pinctrl-scmi.c | 64 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)

diff --git a/drivers/pinctrl/pinctrl-scmi.c b/drivers/pinctrl/pinctrl-scmi.c
index 6f44e8c0fee6..ba649304638e 100644
--- a/drivers/pinctrl/pinctrl-scmi.c
+++ b/drivers/pinctrl/pinctrl-scmi.c
@@ -74,6 +74,69 @@ static int pinctrl_scmi_free(struct pinctrl_dev *pctldev, unsigned int offset)
 	return pinctrl_ops->pin_free(pmx->ph, offset);
 }
 
+static int pinctrl_scmi_gpio_mux_set(struct scmi_pinctrl *pmx, unsigned int pin)
+{
+	const unsigned int *elems, *pins;
+	unsigned int nr_elems, nr_pins, i;
+	bool pin_only, gpio;
+	int nr_functions, func, ret;
+
+	nr_functions = pinctrl_ops->count_get(pmx->ph, FUNCTION_TYPE);
+	for (func = 0; func < nr_functions; func++) {
+		ret = pinctrl_ops->function_flags_get(pmx->ph, func, &pin_only,
+						      &gpio);
+		if (ret)
+			return ret;
+
+		if (!gpio)
+			continue;
+
+		ret = pinctrl_ops->function_groups_get(pmx->ph, func, &nr_elems,
+						       &elems);
+		if (ret)
+			return ret;
+
+		for (i = 0; i < nr_elems; i++) {
+			if (pin_only) {
+				if (elems[i] != pin)
+					continue;
+
+				return pinctrl_ops->pin_mux_set(pmx->ph, func,
+								pin);
+			}
+
+			ret = pinctrl_ops->group_pins_get(pmx->ph, elems[i],
+							  &pins, &nr_pins);
+			if (ret)
+				return ret;
+
+			if (nr_pins == 1 && pins[0] == pin)
+				return pinctrl_ops->mux_set(pmx->ph, func,
+							    elems[i]);
+		}
+	}
+
+	return 0;
+}
+
+static int pinctrl_scmi_gpio_request_enable(struct pinctrl_dev *pctldev,
+					    struct pinctrl_gpio_range *range,
+					    unsigned int offset)
+{
+	struct scmi_pinctrl *pmx = pinctrl_dev_get_drvdata(pctldev);
+	int ret;
+
+	ret = pinctrl_ops->pin_request(pmx->ph, offset);
+	if (ret)
+		return ret;
+
+	ret = pinctrl_scmi_gpio_mux_set(pmx, offset);
+	if (ret)
+		pinctrl_ops->pin_free(pmx->ph, offset);
+
+	return ret;
+}
+
 static const struct pinmux_ops pinctrl_scmi_pinmux_ops = {
 	.request = pinctrl_scmi_request,
 	.free = pinctrl_scmi_free,
@@ -82,6 +145,7 @@ static const struct pinmux_ops pinctrl_scmi_pinmux_ops = {
 	.get_function_groups = pinmux_generic_get_function_groups,
 	.function_is_gpio = pinmux_generic_function_is_gpio,
 	.set_mux = pinctrl_scmi_func_set_mux,
+	.gpio_request_enable = pinctrl_scmi_gpio_request_enable,
 };
 
 static int pinctrl_scmi_map_pinconf_type(enum pin_config_param param,

-- 
2.56.0