linux-kernel - Re: [PATCH 1/8] i2c: sprd: Add configurations that support 1Mhz and 3.4Mhz frequencies

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Message-ID: <20230902202533.bpquxhjq3mrhmwew@zenone.zhora.eu>
Date:   Sat, 2 Sep 2023 22:25:33 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Huangzheng Lai <Huangzheng.Lai@...soc.com>
Cc:     Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        huangzheng lai <laihuangzheng@...il.com>,
        Xiongpeng Wu <xiongpeng.wu@...soc.com>
Subject: Re: [PATCH 1/8] i2c: sprd: Add configurations that support 1Mhz and
 3.4Mhz frequencies

Hi Huangzheng,

On Thu, Aug 17, 2023 at 05:45:13PM +0800, Huangzheng Lai wrote:
> This patch adds I2C controller driver support for 1Mhz and 3.4Mhz
> frequency configurations.

please avoid the "This patch adds..." form, it can be sometimes
misleading... Use always the imperative form.

"Add support for 1Mhz and 3.5Mhz frequency configuration"

> Signed-off-by: Huangzheng Lai <Huangzheng.Lai@...soc.com>
> ---
>  drivers/i2c/busses/i2c-sprd.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
> index ffc54fbf814d..acc2a4d4eeae 100644
> --- a/drivers/i2c/busses/i2c-sprd.c
> +++ b/drivers/i2c/busses/i2c-sprd.c
> @@ -347,6 +347,10 @@ static void sprd_i2c_set_clk(struct sprd_i2c *i2c_dev, u32 freq)
>  		writel((6 * apb_clk) / 10000000, i2c_dev->base + ADDR_STA0_DVD);
>  	else if (freq == I2C_MAX_STANDARD_MODE_FREQ)
>  		writel((4 * apb_clk) / 1000000, i2c_dev->base + ADDR_STA0_DVD);
> +	else if (freq == I2C_MAX_FAST_MODE_PLUS_FREQ)
> +		writel((8 * apb_clk) / 10000000, i2c_dev->base + ADDR_STA0_DVD);
> +	else if (freq == I2C_MAX_HIGH_SPEED_MODE_FREQ)
> +		writel((8 * apb_clk) / 10000000, i2c_dev->base + ADDR_STA0_DVD);

if you want you can queue up a patch that makes this train of
"else if" in a switch case.

>  }
>  
>  static void sprd_i2c_enable(struct sprd_i2c *i2c_dev)
> @@ -519,9 +523,11 @@ static int sprd_i2c_probe(struct platform_device *pdev)
>  	if (!of_property_read_u32(dev->of_node, "clock-frequency", &prop))
>  		i2c_dev->bus_freq = prop;
>  
> -	/* We only support 100k and 400k now, otherwise will return error. */
> +	/* We only support 100k\400k\1m\3.4m now, otherwise will return error. */
>  	if (i2c_dev->bus_freq != I2C_MAX_STANDARD_MODE_FREQ &&
> -	    i2c_dev->bus_freq != I2C_MAX_FAST_MODE_FREQ)
> +			i2c_dev->bus_freq != I2C_MAX_FAST_MODE_FREQ &&
> +			i2c_dev->bus_freq != I2C_MAX_FAST_MODE_PLUS_FREQ &&
> +			i2c_dev->bus_freq != I2C_MAX_HIGH_SPEED_MODE_FREQ)

We finally make use of these defines :)

Acked-by: Andi Shyti <andi.shyti@...nel.org> 

Thanks,
Andi

>  		return -EINVAL;
>  
>  	ret = sprd_i2c_clk_init(i2c_dev);
> -- 
> 2.17.1
>