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ramips: pinctrl: support requesting different functions for same group

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MT7620 wireless radio needs change the pin group function between
"gpio" and "pa" during the calibration process. However, ralink
pinctrl driver doesn't support requesting different functions for
the same group. This patch enables pinctrl consumers to perform
such operations.

Signed-off-by: Shiji Yang <yangshiji66@qq.com>
(cherry picked from commit b4ea49ad44)
This commit is contained in:
Shiji Yang 2023-07-29 21:24:10 +08:00 committed by Daniel Golle
parent 4f1a7e8897
commit 9df9126320
1 changed files with 45 additions and 0 deletions
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45
target/linux/ramips/patches-5.15/808-pinctrl-mtmips-support-requesting-different-function.patch Normal file
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@ -0,0 +1,45 @@
From: Shiji Yang <yangshiji66@outlook.com>
Date: Wed, 26 Jul 2023 01:32:55 +0800
Subject: [PATCH] pinctrl: mtmips: support requesting different functions for
same group
Sometimes pinctrl consumers may request different functions for the
same pin group in different situations. This patch can help to reset
the group function flag when requesting a different function.
Signed-off-by: Shiji Yang <yangshiji66@outlook.com>
---
drivers/pinctrl/ralink/pinctrl-ralink.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
--- a/drivers/pinctrl/ralink/pinctrl-ralink.c
+++ b/drivers/pinctrl/ralink/pinctrl-ralink.c
@@ -123,11 +123,24 @@ static int ralink_pmx_group_enable(struc
int i;
int shift;
- /* dont allow double use */
+ /*
+ * for the same pin group, if request a different function,
+ * then clear the group function flag and continue, else exit.
+ */
if (p->groups[group].enabled) {
- dev_err(p->dev, "%s is already enabled\n",
- p->groups[group].name);
- return 0;
+ for (i = 0; i < p->groups[group].func_count; i++) {
+ if (p->groups[group].func[i].enabled == 1) {
+ if (!strcmp(p->func[func]->name,
+ p->groups[group].func[i].name))
+ return 0;
+ p->groups[group].func[i].enabled = 0;
+ break;
+ }
+ }
+
+ /* exit if request the "gpio" function again */
+ if (i == p->groups[group].func_count && func == 0)
+ return 0;
}
p->groups[group].enabled = 1;