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

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Message-ID: <c2991370-b55f-c782-d62c-f9c667e40389@linaro.org>
Date:   Fri, 12 Aug 2022 13:13:10 +0300
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>, 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: Re: [PATCH 6/6] i2c: imx-lpi2c: handle IPG clock

On 12/08/2022 07:34, Peng Fan (OSS) wrote:
> 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);
>  	}

You just broke all DTS...

Best regards,
Krzysztof