linux-kernel - [PATCH 2/8] pinctrl: nuvoton: wpcm450: Fix handling of inverted MFSEL bits

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Message-Id: <20221105185911.1547847-3-j.neuschaefer@gmx.net>
Date:   Sat,  5 Nov 2022 19:59:05 +0100
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     linux-spi@...r.kernel.org, openbmc@...ts.ozlabs.org
Cc:     Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Jonathan Neuschäfer <j.neuschaefer@....net>,
        Mark Brown <broonie@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org
Subject: [PATCH 2/8] pinctrl: nuvoton: wpcm450: Fix handling of inverted MFSEL bits

SCS3SEL and KBCCSEL use inverted logic: Whereas in other fields 0
selects the GPIO function and 1 selects the special function, in these
two fields, 0 selects the special function and 1 selects the GPIO
function.

Adjust the code to handle this quirk.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
---
 drivers/pinctrl/nuvoton/pinctrl-wpcm450.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c b/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c
index 49b2177af17b2..2d1c1652cfd9d 100644
--- a/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c
+++ b/drivers/pinctrl/nuvoton/pinctrl-wpcm450.c
@@ -628,6 +628,9 @@ struct wpcm450_pincfg {
 	int fn1, reg1, bit1;
 };

+/* Add this value to bit0 or bit1 to indicate that the MFSEL bit is inverted */
+#define INV	BIT(5)
+
 static const struct wpcm450_pincfg pincfg[] = {
 	/*		PIN	  FUNCTION 1		   FUNCTION 2 */
 	WPCM450_PINCFG(0,	 none, NONE, 0,		  none, NONE, 0),
@@ -665,7 +668,7 @@ static const struct wpcm450_pincfg pincfg[] = {

 	WPCM450_PINCFG(32,	 scs1, MFSEL1, 3,	  none, NONE, 0),
 	WPCM450_PINCFG(33,	 scs2, MFSEL1, 4,	  none, NONE, 0),
-	WPCM450_PINCFG(34,	 scs3, MFSEL1, 5,	  none, NONE, 0),
+	WPCM450_PINCFG(34,	 scs3, MFSEL1, 5 | INV,	  none, NONE, 0),
 	WPCM450_PINCFG(35,	 xcs1, MFSEL1, 29,	  none, NONE, 0),
 	WPCM450_PINCFG(36,	 xcs2, MFSEL1, 28,	  none, NONE, 0),
 	WPCM450_PINCFG(37,	 none, NONE, 0,		  none, NONE, 0), /* DVO */
@@ -725,8 +728,8 @@ static const struct wpcm450_pincfg pincfg[] = {
 	WPCM450_PINCFG(90,	r2err, MFSEL1, 15,	  none, NONE, 0),
 	WPCM450_PINCFG(91,	 r2md, MFSEL1, 16,	  none, NONE, 0),
 	WPCM450_PINCFG(92,	 r2md, MFSEL1, 16,	  none, NONE, 0),
-	WPCM450_PINCFG(93,	 kbcc, MFSEL1, 17,	  none, NONE, 0),
-	WPCM450_PINCFG(94,	 kbcc, MFSEL1, 17,	  none, NONE, 0),
+	WPCM450_PINCFG(93,	 kbcc, MFSEL1, 17 | INV,  none, NONE, 0),
+	WPCM450_PINCFG(94,	 kbcc, MFSEL1, 17 | INV,  none, NONE, 0),
 	WPCM450_PINCFG(95,	 none, NONE, 0,		  none, NONE, 0),

 	WPCM450_PINCFG(96,	 none, NONE, 0,		  none, NONE, 0),
@@ -805,6 +808,11 @@ static void wpcm450_update_mfsel(struct regmap *gcr_regmap, int reg, int bit, in
 {
 	bool value = (fn == fn_selected);

+	if (bit & INV) {
+		value = !value;
+		bit &= ~INV;
+	}
+
 	regmap_update_bits(gcr_regmap, reg, BIT(bit), value ? BIT(bit) : 0);
 }

--
2.35.1