linux-kernel - [PATCH 6/6] i2c: imx-lpi2c: handle IPG clock

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Date:   Fri, 12 Aug 2022 12:34:24 +0800
From:   "Peng Fan (OSS)" <peng.fan@....nxp.com>
To:     aisheng.dong@....com, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, shawnguo@...nel.org,
        s.hauer@...gutronix.de
Cc:     kernel@...gutronix.de, festevam@...il.com, linux-imx@....com,
        linux-i2c@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        xiaoning.wang@....com, Peng Fan <peng.fan@....com>
Subject: [PATCH 6/6] i2c: imx-lpi2c: handle IPG clock

From: Peng Fan <peng.fan@....com>

The LPI2C controller needs both PER and IPG clock to work, but current
driver only supports PER clock. This patch add IPG clock.

Signed-off-by: Peng Fan <peng.fan@....com>
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 41 ++++++++++++++++++++++--------
 1 file changed, 31 insertions(+), 10 deletions(-)

diff --git a/drivers/i2c/busses/i2c-imx-lpi2c.c b/drivers/i2c/busses/i2c-imx-lpi2c.c
index 8b9ba055c418..f43ad1ae8627 100644
--- a/drivers/i2c/busses/i2c-imx-lpi2c.c
+++ b/drivers/i2c/busses/i2c-imx-lpi2c.c
@@ -94,7 +94,8 @@ enum lpi2c_imx_pincfg {
 
 struct lpi2c_imx_struct {
 	struct i2c_adapter	adapter;
-	struct clk		*clk;
+	struct clk		*clk_per;
+	struct clk		*clk_ipg;
 	void __iomem		*base;
 	__u8			*rx_buf;
 	__u8			*tx_buf;
@@ -207,7 +208,7 @@ static int lpi2c_imx_config(struct lpi2c_imx_struct *lpi2c_imx)
 
 	lpi2c_imx_set_mode(lpi2c_imx);
 
-	clk_rate = clk_get_rate(lpi2c_imx->clk);
+	clk_rate = clk_get_rate(lpi2c_imx->clk_per);
 	if (lpi2c_imx->mode == HS || lpi2c_imx->mode == ULTRA_FAST)
 		filt = 0;
 	else
@@ -561,10 +562,16 @@ static int lpi2c_imx_probe(struct platform_device *pdev)
 	strlcpy(lpi2c_imx->adapter.name, pdev->name,
 		sizeof(lpi2c_imx->adapter.name));
 
-	lpi2c_imx->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(lpi2c_imx->clk)) {
+	lpi2c_imx->clk_per = devm_clk_get(&pdev->dev, "per");
+	if (IS_ERR(lpi2c_imx->clk_per)) {
 		dev_err(&pdev->dev, "can't get I2C peripheral clock\n");
-		return PTR_ERR(lpi2c_imx->clk);
+		return PTR_ERR(lpi2c_imx->clk_per);
+	}
+
+	lpi2c_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg");
+	if (IS_ERR(lpi2c_imx->clk_ipg)) {
+		dev_err(&pdev->dev, "can't get I2C ipg clock\n");
+		return PTR_ERR(lpi2c_imx->clk_ipg);
 	}
 
 	ret = of_property_read_u32(pdev->dev.of_node,
@@ -582,9 +589,15 @@ static int lpi2c_imx_probe(struct platform_device *pdev)
 	i2c_set_adapdata(&lpi2c_imx->adapter, lpi2c_imx);
 	platform_set_drvdata(pdev, lpi2c_imx);
 
-	ret = clk_prepare_enable(lpi2c_imx->clk);
+	ret = clk_prepare_enable(lpi2c_imx->clk_per);
+	if (ret) {
+		dev_err(&pdev->dev, "per clk enable failed %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(lpi2c_imx->clk_ipg);
 	if (ret) {
-		dev_err(&pdev->dev, "clk enable failed %d\n", ret);
+		dev_err(&pdev->dev, "ipg clk enable failed %d\n", ret);
 		return ret;
 	}
 
@@ -633,7 +646,8 @@ static int __maybe_unused lpi2c_runtime_suspend(struct device *dev)
 {
 	struct lpi2c_imx_struct *lpi2c_imx = dev_get_drvdata(dev);
 
-	clk_disable_unprepare(lpi2c_imx->clk);
+	clk_disable_unprepare(lpi2c_imx->clk_ipg);
+	clk_disable_unprepare(lpi2c_imx->clk_per);
 	pinctrl_pm_select_sleep_state(dev);
 
 	return 0;
@@ -645,12 +659,19 @@ static int __maybe_unused lpi2c_runtime_resume(struct device *dev)
 	int ret;
 
 	pinctrl_pm_select_default_state(dev);
-	ret = clk_prepare_enable(lpi2c_imx->clk);
+	ret = clk_prepare_enable(lpi2c_imx->clk_per);
 	if (ret) {
-		dev_err(dev, "failed to enable I2C clock, ret=%d\n", ret);
+		dev_err(dev, "failed to enable I2C per clock, ret=%d\n", ret);
 		return ret;
 	}
 
+	ret = clk_prepare_enable(lpi2c_imx->clk_ipg);
+	if (ret) {
+		clk_disable_unprepare(lpi2c_imx->clk_per);
+		dev_err(dev, "failed to enable I2C ipg clock, ret=%d\n", ret);
+	}
+
+
 	return 0;
 }
 
-- 
2.37.1