linux-kernel - [PATCH 1/2] pinctrl: qcom: lpass-lpi: split slew rate set to separate function

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Message-Id: <20230901090224.27770-2-krzysztof.kozlowski@linaro.org>
Date:   Fri,  1 Sep 2023 11:02:23 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH 1/2] pinctrl: qcom: lpass-lpi: split slew rate set to separate function

Setting slew rate for each pin will grow with upcoming Qualcomm SoCs,
so split the code responsible for this into separate function for easier
readability and maintenance.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/pinctrl/qcom/pinctrl-lpass-lpi.c | 53 +++++++++++++++---------
 1 file changed, 33 insertions(+), 20 deletions(-)

diff --git a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
index 0b2839d27fd6..e2df2193a802 100644
--- a/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
+++ b/drivers/pinctrl/qcom/pinctrl-lpass-lpi.c
@@ -186,6 +186,35 @@ static int lpi_config_get(struct pinctrl_dev *pctldev,
 	return 0;
 }
 
+static int lpi_config_set_slew_rate(struct lpi_pinctrl *pctrl,
+				    const struct lpi_pingroup *g,
+				    unsigned int group, unsigned int slew)
+{
+	unsigned long sval;
+	int slew_offset;
+
+	if (slew > LPI_SLEW_RATE_MAX) {
+		dev_err(pctrl->dev, "invalid slew rate %u for pin: %d\n",
+			slew, group);
+		return -EINVAL;
+	}
+
+	slew_offset = g->slew_offset;
+	if (slew_offset == LPI_NO_SLEW)
+		return 0;
+
+	mutex_lock(&pctrl->lock);
+
+	sval = ioread32(pctrl->slew_base + LPI_SLEW_RATE_CTL_REG);
+	sval &= ~(LPI_SLEW_RATE_MASK << slew_offset);
+	sval |= slew << slew_offset;
+	iowrite32(sval, pctrl->slew_base + LPI_SLEW_RATE_CTL_REG);
+
+	mutex_unlock(&pctrl->lock);
+
+	return 0;
+}
+
 static int lpi_config_set(struct pinctrl_dev *pctldev, unsigned int group,
 			  unsigned long *configs, unsigned int nconfs)
 {
@@ -193,8 +222,7 @@ static int lpi_config_set(struct pinctrl_dev *pctldev, unsigned int group,
 	unsigned int param, arg, pullup = LPI_GPIO_BIAS_DISABLE, strength = 2;
 	bool value, output_enabled = false;
 	const struct lpi_pingroup *g;
-	unsigned long sval;
-	int i, slew_offset;
+	int i, ret;
 	u32 val;
 
 	g = &pctrl->data->groups[group];
@@ -226,24 +254,9 @@ static int lpi_config_set(struct pinctrl_dev *pctldev, unsigned int group,
 			strength = arg;
 			break;
 		case PIN_CONFIG_SLEW_RATE:
-			if (arg > LPI_SLEW_RATE_MAX) {
-				dev_err(pctldev->dev, "invalid slew rate %u for pin: %d\n",
-					arg, group);
-				return -EINVAL;
-			}
-
-			slew_offset = g->slew_offset;
-			if (slew_offset == LPI_NO_SLEW)
-				break;
-
-			mutex_lock(&pctrl->lock);
-
-			sval = ioread32(pctrl->slew_base + LPI_SLEW_RATE_CTL_REG);
-			sval &= ~(LPI_SLEW_RATE_MASK << slew_offset);
-			sval |= arg << slew_offset;
-			iowrite32(sval, pctrl->slew_base + LPI_SLEW_RATE_CTL_REG);
-
-			mutex_unlock(&pctrl->lock);
+			ret = lpi_config_set_slew_rate(pctrl, g, group, arg);
+			if (ret)
+				return ret;
 			break;
 		default:
 			return -EINVAL;
-- 
2.34.1