linux-kernel - [PATCH 4/7] pinctrl: mediatek: paris: Fix pingroup pin config state readback

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Date:   Tue, 11 Jan 2022 19:22:41 +0800
From:   Chen-Yu Tsai <wenst@...omium.org>
To:     Sean Wang <sean.wang@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Chen-Yu Tsai <wenst@...omium.org>,
        linux-mediatek@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Zhiyong Tao <zhiyong.tao@...iatek.com>,
        Guodong Liu <guodong.liu@...iatek.com>
Subject: [PATCH 4/7] pinctrl: mediatek: paris: Fix pingroup pin config state readback

mtk_pconf_group_get(), used to read back pingroup pin config state,
simply returns a set of configs saved from a previous invocation of
mtk_pconf_group_set(). This is an unfiltered, unvalidated set passed
in from the pinconf core, which does not match the current hardware
state.

Since the driver library is designed to have a pin per group, pass
through mtk_pconf_group_get() to mtk_pinconf_get(), to read back
the current pin config state of the only pin in the group.

Fixes: 805250982bb5 ("pinctrl: mediatek: add pinctrl-paris that implements the vendor dt-bindings")
Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
 drivers/pinctrl/mediatek/pinctrl-paris.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c
index d720624d8cd2..d259f075c62d 100644
--- a/drivers/pinctrl/mediatek/pinctrl-paris.c
+++ b/drivers/pinctrl/mediatek/pinctrl-paris.c
@@ -736,10 +736,10 @@ static int mtk_pconf_group_get(struct pinctrl_dev *pctldev, unsigned group,
 			       unsigned long *config)
 {
 	struct mtk_pinctrl *hw = pinctrl_dev_get_drvdata(pctldev);
+	struct mtk_pinctrl_group *grp = &hw->groups[group];
 
-	*config = hw->groups[group].config;
-
-	return 0;
+	 /* One pin per group only */
+	return mtk_pinconf_get(pctldev, grp->pin, config);
 }
 
 static int mtk_pconf_group_set(struct pinctrl_dev *pctldev, unsigned group,
-- 
2.34.1.575.g55b058a8bb-goog