linux-kernel - Re: [PATCH next v2] i2c: hisi: Add support to get clock frequency from clock property

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Message-ID: <36c1742f-f0a5-84e9-15af-07c888058759@huawei.com>
Date:   Mon, 26 Sep 2022 16:48:03 +0800
From:   Yicong Yang <yangyicong@...wei.com>
To:     Weilong Chen <chenweilong@...wei.com>
CC:     <linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <yangyicong@...ilicon.com>
Subject: Re: [PATCH next v2] i2c: hisi: Add support to get clock frequency
 from clock property

On 2022/9/23 9:14, Weilong Chen wrote:
> Support the driver to obtain clock information by clk_rate or
> clock property. Find clock first, if not, fall back to clk_rate.
> 
> Signed-off-by: Weilong Chen <chenweilong@...wei.com>
> ---
> Change since v1:
> - Ordered struct field to inverted triangle.
> - Use devm_clk_get_optional_enabled().
> - Use IS_ERR_OR_NULL.
> Link: https://lore.kernel.org/lkml/20220921101540.352553-1-chenweilong@huawei.com/
> 
>  drivers/i2c/busses/i2c-hisi.c | 16 ++++++++++++----
>  1 file changed, 12 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-hisi.c b/drivers/i2c/busses/i2c-hisi.c
> index 67031024217c..b3bcce71dd2c 100644
> --- a/drivers/i2c/busses/i2c-hisi.c
> +++ b/drivers/i2c/busses/i2c-hisi.c
> @@ -8,6 +8,7 @@
>  #include <linux/acpi.h>
>  #include <linux/bits.h>
>  #include <linux/bitfield.h>
> +#include <linux/clk.h>
>  #include <linux/completion.h>
>  #include <linux/i2c.h>
>  #include <linux/interrupt.h>
> @@ -90,6 +91,7 @@ struct hisi_i2c_controller {
>  	struct i2c_adapter adapter;
>  	void __iomem *iobase;
>  	struct device *dev;
> +	struct clk *clk;
>  	int irq;
>  
>  	/* Intermediates for recording the transfer process */
> @@ -456,10 +458,16 @@ static int hisi_i2c_probe(struct platform_device *pdev)
>  		return ret;
>  	}
>  
> -	ret = device_property_read_u64(dev, "clk_rate", &clk_rate_hz);
> -	if (ret) {
> -		dev_err(dev, "failed to get clock frequency, ret = %d\n", ret);
> -		return ret;
> +	ctlr->clk = devm_clk_get_optional_enabled(&pdev->dev, NULL);
> +	if (IS_ERR_OR_NULL(ctlr->clk)) {
> +		ret = device_property_read_u64(dev, "clk_rate", &clk_rate_hz);
> +		if (ret) {
> +			dev_err(dev, "failed to get clock frequency, ret = %d\n", ret);
> +			return ret;
> +		}
> +	} else {
> +

redundant blank line? with this addressed:

Acked-by: Yicong Yang <yangyicong@...ilicon.com>

> +		clk_rate_hz = clk_get_rate(ctlr->clk);
>  	}
>  
>  	ctlr->clk_rate_khz = DIV_ROUND_UP_ULL(clk_rate_hz, HZ_PER_KHZ);
>