diff mbox series

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

Message ID 20220812043424.4078034-7-peng.fan@oss.nxp.com
State New
Headers show
Series i2c-imx-lpi2c: add IPG clock | expand

Commit Message

Peng Fan (OSS) Aug. 12, 2022, 4:34 a.m. UTC 
From: Peng Fan <peng.fan@nxp.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@nxp.com>
---
 drivers/i2c/busses/i2c-imx-lpi2c.c | 41 ++++++++++++++++++++++--------
 1 file changed, 31 insertions(+), 10 deletions(-)

Comments

Krzysztof Kozlowski Aug. 12, 2022, 10:13 a.m. UTC | #1 
On 12/08/2022 07:34, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.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@nxp.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);
>  	}

You just broke all DTS...

Best regards,
Krzysztof
Krzysztof Kozlowski Aug. 12, 2022, 6:58 p.m. UTC | #2 
On 12/08/2022 13:13, Krzysztof Kozlowski wrote:
>> +
>> +	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);
>>  	}
> 
> You just broke all DTS...

And Rob's bot agrees (through bindings):
https://lore.kernel.org/all/1660317233.465911.168987.nullmailer@robh.at.kernel.org/

Best regards,
Krzysztof
diff mbox series

Patch

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;
 }