pinctrl: Pass all configs to driver on pin_config_set()

When setting pin configuration in the pinctrl framework, pin_config_set() or
pin_config_group_set() is called in a loop to set one configuration at a time
for the specified pin or group.

This patch 1) removes the loop and 2) changes the API to pass the whole pin
config array to the driver.  It is now up to the driver to loop through the
configs.  This allows the driver to potentially combine configs and reduce the
number of writes to pin config registers.

All c files changed have been build-tested to verify the change compiles and
that the corresponding .o is successfully generated.

[For LSK this has been modified such that the old API is still present and
instead a new pinconf_set_bulk() callback has been added in order to avoid
breaking other users in the stable kernel -- broonie]

Signed-off-by: Sherman Yin <syin@broadcom.com>
Reviewed-by: Christian Daudt <csd@broadcom.com>
Reviewed-by: Matt Porter <matt.porter@linaro.org>
Tested-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
(cherry picked from commit 03b054e9696c3cbd3d5905ec96da15acd0a2fe8d)
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 41 insertions, 14 deletions

diff --git a/drivers/pinctrl/pinconf.c b/drivers/pinctrl/pinconf.c
index e875f21a590..ad30263a741 100644
--- a/drivers/pinctrl/pinconf.c
+++ b/drivers/pinctrl/pinconf.c
@@ -158,7 +158,7 @@ int pinconf_apply_setting(struct pinctrl_setting const *setting)
 {
 	struct pinctrl_dev *pctldev = setting->pctldev;
 	const struct pinconf_ops *ops = pctldev->desc->confops;
-	int i, ret;
+	int ret, i;
 
 	if (!ops) {
 		dev_err(pctldev->dev, "missing confops\n");
@@ -167,39 +167,66 @@ int pinconf_apply_setting(struct pinctrl_setting const *setting)
 
 	switch (setting->type) {
 	case PIN_MAP_TYPE_CONFIGS_PIN:
-		if (!ops->pin_config_set) {
+		if (!ops->pin_config_set && !ops->pin_config_set_bulk) {
 			dev_err(pctldev->dev, "missing pin_config_set op\n");
 			return -EINVAL;
 		}
-		for (i = 0; i < setting->data.configs.num_configs; i++) {
-			ret = ops->pin_config_set(pctldev,
+		if (ops->pin_config_group_set_bulk) {
+			ret = ops->pin_config_group_set_bulk(pctldev,
 					setting->data.configs.group_or_pin,
-					setting->data.configs.configs[i]);
+					setting->data.configs.configs,
+					setting->data.configs.num_configs);
 			if (ret < 0) {
 				dev_err(pctldev->dev,
-					"pin_config_set op failed for pin %d config %08lx\n",
-					setting->data.configs.group_or_pin,
-					setting->data.configs.configs[i]);
+					"pin_config_set op failed for pin %d\n",
+					setting->data.configs.group_or_pin);
 				return ret;
 			}
+		} else if (ops->pin_config_set) {
+			for (i = 0; i < setting->data.configs.num_configs; i++) {
+				ret = ops->pin_config_set(pctldev,
+							  setting->data.configs.group_or_pin,
+							  setting->data.configs.configs[i]);
+				if (ret < 0) {
+					dev_err(pctldev->dev,
+						"pin_config_set op failed for pin %d config %08lx\n",
+						setting->data.configs.group_or_pin,
+						setting->data.configs.configs[i]);
+					return ret;
+				}
+			}
 		}
 		break;
 	case PIN_MAP_TYPE_CONFIGS_GROUP:
-		if (!ops->pin_config_group_set) {
+		if (!ops->pin_config_group_set &&
+		    !ops->pin_config_group_set_bulk) {
 			dev_err(pctldev->dev,
 				"missing pin_config_group_set op\n");
 			return -EINVAL;
 		}
-		for (i = 0; i < setting->data.configs.num_configs; i++) {
-			ret = ops->pin_config_group_set(pctldev,
+		if (ops->pin_config_group_set_bulk) {
+			ret = ops->pin_config_group_set_bulk(pctldev,
 					setting->data.configs.group_or_pin,
-					setting->data.configs.configs[i]);
+					setting->data.configs.configs,
+					setting->data.configs.num_configs);
 			if (ret < 0) {
 				dev_err(pctldev->dev,
-					"pin_config_group_set op failed for group %d config %08lx\n",
+					"pin_config_group_set op failed for group %d\n",
+					setting->data.configs.group_or_pin);
+				return ret;
+			}
+		} else if (ops->pin_config_group_set) {
+			for (i = 0; i < setting->data.configs.num_configs; i++) {
+				ret = ops->pin_config_group_set(pctldev,
 					setting->data.configs.group_or_pin,
 					setting->data.configs.configs[i]);
-				return ret;
+				if (ret < 0) {
+					dev_err(pctldev->dev,
+						"pin_config_group_set op failed for group %d config %08lx\n",
+						setting->data.configs.group_or_pin,
+						setting->data.configs.configs[i]);
+					return ret;
+				}
 			}
 		}
 		break;