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.

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>

1 files changed, 7 insertions, 4 deletions

diff --git a/drivers/pinctrl/pinctrl-st.c b/drivers/pinctrl/pinctrl-st.c
index 2a10a31..9cadc68 100644
--- a/drivers/pinctrl/pinctrl-st.c
+++ b/drivers/pinctrl/pinctrl-st.c
@@ -909,15 +909,18 @@ static void st_pinconf_set_retime(struct st_pinctrl *info,
 							config, pin);
 }
 
-static int st_pinconf_set(struct pinctrl_dev *pctldev,
-			     unsigned pin_id, unsigned long config)
+static int st_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin_id,
+			unsigned long *configs, unsigned num_configs)
 {
 	int pin = st_gpio_pin(pin_id);
 	struct st_pinctrl *info = pinctrl_dev_get_drvdata(pctldev);
 	struct st_pio_control *pc = st_get_pio_control(pctldev, pin_id);
+	int i;
 
-	st_pinconf_set_config(pc, pin, config);
-	st_pinconf_set_retime(info, pc, pin, config);
+	for (i = 0; i < num_configs; i++) {
+		st_pinconf_set_config(pc, pin, configs[i]);
+		st_pinconf_set_retime(info, pc, pin, configs[i]);
+	} /* for each config */
 
 	return 0;
 }