linux-kernel - [PATCH v2 1/4] pinctrl: mediatek: add support for MTK_PULL_PD

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Message-ID: <20241006100843.13280-2-linux@fw-web.de>
Date: Sun,  6 Oct 2024 12:08:37 +0200
From: Frank Wunderlich <linux@...web.de>
To: Linus Walleij <linus.walleij@...aro.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Sean Wang <sean.wang@...nel.org>
Cc: Frank Wunderlich <frank-w@...lic-files.de>,
	linux-gpio@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	daniel@...rotopia.org,
	john@...ozen.org,
	ansuelsmth@...il.com,
	eladwf@...il.com
Subject: [PATCH v2 1/4] pinctrl: mediatek: add support for MTK_PULL_PD_TYPE

From: Daniel Golle <daniel@...rotopia.org>

The MediaTek MT7988 SoC got some pins which only got configurable
pull-down but unlike previous designs there is no pull-up option.
Add new type MTK_PULL_PD_TYPE to support configuring such pins.

Signed-off-by: Daniel Golle <daniel@...rotopia.org>
Signed-off-by: Frank Wunderlich <frank-w@...lic-files.de>
---
 .../pinctrl/mediatek/pinctrl-mtk-common-v2.c  | 59 +++++++++++++++++++
 .../pinctrl/mediatek/pinctrl-mtk-common-v2.h  |  1 +
 2 files changed, 60 insertions(+)

diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
index 54301fbba524..eff2aecd31dd 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -601,6 +601,30 @@ static int mtk_pinconf_bias_set_pu_pd(struct mtk_pinctrl *hw,
 	return err;
 }
 
+static int mtk_pinconf_bias_set_pd(struct mtk_pinctrl *hw,
+				const struct mtk_pin_desc *desc,
+				u32 pullup, u32 arg)
+{
+	int err, pd;
+
+	if (arg == MTK_DISABLE)
+		pd = 0;
+	else if ((arg == MTK_ENABLE) && pullup)
+		pd = 0;
+	else if ((arg == MTK_ENABLE) && !pullup)
+		pd = 1;
+	else {
+		err = -EINVAL;
+		goto out;
+	}
+
+	err = mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_PD, pd);
+
+out:
+	return err;
+
+}
+
 static int mtk_pinconf_bias_set_pullsel_pullen(struct mtk_pinctrl *hw,
 				const struct mtk_pin_desc *desc,
 				u32 pullup, u32 arg)
@@ -758,6 +782,12 @@ int mtk_pinconf_bias_set_combo(struct mtk_pinctrl *hw,
 			return 0;
 	}
 
+	if (try_all_type & MTK_PULL_PD_TYPE) {
+		err = mtk_pinconf_bias_set_pd(hw, desc, pullup, arg);
+		if (!err)
+			return err;
+	}
+
 	if (try_all_type & MTK_PULL_PU_PD_TYPE) {
 		err = mtk_pinconf_bias_set_pu_pd(hw, desc, pullup, arg);
 		if (!err)
@@ -878,6 +908,29 @@ static int mtk_pinconf_bias_get_pu_pd(struct mtk_pinctrl *hw,
 	return err;
 }
 
+static int mtk_pinconf_bias_get_pd(struct mtk_pinctrl *hw,
+				const struct mtk_pin_desc *desc,
+				u32 *pullup, u32 *enable)
+{
+	int err, pd;
+
+	err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_PD, &pd);
+	if (err)
+		goto out;
+
+	if (pd == 0) {
+		*pullup = 0;
+		*enable = MTK_DISABLE;
+	} else if (pd == 1) {
+		*pullup = 0;
+		*enable = MTK_ENABLE;
+	} else
+		err = -EINVAL;
+
+out:
+	return err;
+}
+
 static int mtk_pinconf_bias_get_pullsel_pullen(struct mtk_pinctrl *hw,
 				const struct mtk_pin_desc *desc,
 				u32 *pullup, u32 *enable)
@@ -947,6 +1000,12 @@ int mtk_pinconf_bias_get_combo(struct mtk_pinctrl *hw,
 			return 0;
 	}
 
+	if (try_all_type & MTK_PULL_PD_TYPE) {
+		err = mtk_pinconf_bias_get_pd(hw, desc, pullup, enable);
+		if (!err)
+			return err;
+	}
+
 	if (try_all_type & MTK_PULL_PU_PD_TYPE) {
 		err = mtk_pinconf_bias_get_pu_pd(hw, desc, pullup, enable);
 		if (!err)
diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
index 23688ca6d04e..9c271dc2b521 100644
--- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
+++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.h
@@ -24,6 +24,7 @@
  * turned on/off itself. But it can't be selected pull up/down
  */
 #define MTK_PULL_RSEL_TYPE		BIT(3)
+#define MTK_PULL_PD_TYPE        BIT(4)
 /* MTK_PULL_PU_PD_RSEL_TYPE is a type which is controlled by
  * MTK_PULL_PU_PD_TYPE and MTK_PULL_RSEL_TYPE.
  */
-- 
2.43.0