mediatek: backport new pinctrl features

Backport new features for MediaTek pinctrl/pinconf drivers from upstream.
This will serve as the base to improve pinconf bias/pull-up/pull-down on
MT7981 and MT7986, and also prepare for upcoming support for MT7988.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

1 files changed, 31 insertions, 0 deletions

diff --git a/target/linux/mediatek/patches-5.15/823-v5.17-pinctrl-mediatek-add-a-check-for-error-in-mtk_pincon.patch b/target/linux/mediatek/patches-5.15/823-v5.17-pinctrl-mediatek-add-a-check-for-error-in-mtk_pincon.patch
new file mode 100644
index 0000000000..6752b4093b
--- /dev/null
+++ b/target/linux/mediatek/patches-5.15/823-v5.17-pinctrl-mediatek-add-a-check-for-error-in-mtk_pincon.patch
@@ -0,0 +1,31 @@
+From 9f9d17c228c89e38ed612500126daf626270be9a Mon Sep 17 00:00:00 2001
+From: Dan Carpenter <dan.carpenter@oracle.com>
+Date: Sat, 27 Nov 2021 17:08:36 +0300
+Subject: [PATCH] pinctrl: mediatek: add a check for error in
+ mtk_pinconf_bias_get_rsel()
+
+All the other mtk_hw_get_value() calls have a check for "if (err)" so
+we can add one here as well.  This silences a Smatch warning:
+
+    drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c:819 mtk_pinconf_bias_get_rsel()
+    error: uninitialized symbol 'pd'.
+
+Fixes: fb34a9ae383a ("pinctrl: mediatek: support rsel feature")
+Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
+Link: https://lore.kernel.org/r/20211127140836.GB24002@kili
+Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
+---
+ drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
++++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+@@ -815,6 +815,8 @@ static int mtk_pinconf_bias_get_rsel(str
+ 		goto out;
+ 
+ 	err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PD, &pd);
++	if (err)
++		goto out;
+ 
+ 	if (pu == 0 && pd == 0) {
+ 		*pullup = 0;