pinctrl: replace list_*() with get_*_count()

Most of the SoC drivers implement list_groups() and list_functions()
routines for pinctrl and pinmux. These routines continue returning
zero until the selector argument is greater than total count of
available groups or functions.

This patch replaces these list_*() routines with get_*_count()
routines, which returns the number of available selection for SoC
driver. pinctrl layer will use this value to check the range it can
choose.

This patch fixes all user drivers for this change. There are other
routines in user drivers, which have checks to check validity of
selector passed to them. It is also no more required and hence
removed.

Documentation updated as well.

Acked-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
[Folded in fix and fixed a minor merge artifact manually]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 6 insertions, 14 deletions

diff --git a/drivers/pinctrl/pinctrl-u300.c b/drivers/pinctrl/pinctrl-u300.c
index 26eb8ccd72d5..05d029911be6 100644
--- a/drivers/pinctrl/pinctrl-u300.c
+++ b/drivers/pinctrl/pinctrl-u300.c
@@ -836,18 +836,14 @@ static const struct u300_pin_group u300_pin_groups[] = {
 	},
 };
 
-static int u300_list_groups(struct pinctrl_dev *pctldev, unsigned selector)
+static int u300_get_groups_count(struct pinctrl_dev *pctldev)
 {
-	if (selector >= ARRAY_SIZE(u300_pin_groups))
-		return -EINVAL;
-	return 0;
+	return ARRAY_SIZE(u300_pin_groups);
 }
 
 static const char *u300_get_group_name(struct pinctrl_dev *pctldev,
 				       unsigned selector)
 {
-	if (selector >= ARRAY_SIZE(u300_pin_groups))
-		return NULL;
 	return u300_pin_groups[selector].name;
 }
 
@@ -855,8 +851,6 @@ static int u300_get_group_pins(struct pinctrl_dev *pctldev, unsigned selector,
 			       const unsigned **pins,
 			       unsigned *num_pins)
 {
-	if (selector >= ARRAY_SIZE(u300_pin_groups))
-		return -EINVAL;
 	*pins = u300_pin_groups[selector].pins;
 	*num_pins = u300_pin_groups[selector].num_pins;
 	return 0;
@@ -869,7 +863,7 @@ static void u300_pin_dbg_show(struct pinctrl_dev *pctldev, struct seq_file *s,
 }
 
 static struct pinctrl_ops u300_pctrl_ops = {
-	.list_groups = u300_list_groups,
+	.get_groups_count = u300_get_groups_count,
 	.get_group_name = u300_get_group_name,
 	.get_group_pins = u300_get_group_pins,
 	.pin_dbg_show = u300_pin_dbg_show,
@@ -991,11 +985,9 @@ static void u300_pmx_disable(struct pinctrl_dev *pctldev, unsigned selector,
 	u300_pmx_endisable(upmx, selector, false);
 }
 
-static int u300_pmx_list_funcs(struct pinctrl_dev *pctldev, unsigned selector)
+static int u300_pmx_get_funcs_count(struct pinctrl_dev *pctldev)
 {
-	if (selector >= ARRAY_SIZE(u300_pmx_functions))
-		return -EINVAL;
-	return 0;
+	return ARRAY_SIZE(u300_pmx_functions);
 }
 
 static const char *u300_pmx_get_func_name(struct pinctrl_dev *pctldev,
@@ -1014,7 +1006,7 @@ static int u300_pmx_get_groups(struct pinctrl_dev *pctldev, unsigned selector,
 }
 
 static struct pinmux_ops u300_pmx_ops = {
-	.list_functions = u300_pmx_list_funcs,
+	.get_functions_count = u300_pmx_get_funcs_count,
 	.get_function_name = u300_pmx_get_func_name,
 	.get_function_groups = u300_pmx_get_groups,
 	.enable = u300_pmx_enable,