linux-kernel - Re: [PATCH] rtc: rtc-isl12022: add isl12020 device support

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Date:   Thu, 23 Sep 2021 17:36:55 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Wilken Gottwalt <wilken.gottwalt@...teo.net>
Cc:     linux-kernel@...r.kernel.org,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Joerg Reiling <joerg.reiling@...optik.com>,
        linux-rtc@...r.kernel.org
Subject: Re: [PATCH] rtc: rtc-isl12022: add isl12020 device support

Hi,

On 23/09/2021 12:53:49+0000, Wilken Gottwalt wrote:
> Adds the isl12020 device, which is fully compatible to isl12022.
> 

Do you know what is differing between both parts? If there is nothing
relevant to linux, maybe we could just avoid adding a new compatible
string.

> Signed-off-by: Wilken Gottwalt <wilken.gottwalt@...teo.net>
> Signed-off-by: Joerg Reiling <joerg.reiling@...optik.com>
> ---
>  drivers/rtc/rtc-isl12022.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/rtc/rtc-isl12022.c b/drivers/rtc/rtc-isl12022.c
> index 961bd5d1d109..c62770ec99c9 100644
> --- a/drivers/rtc/rtc-isl12022.c
> +++ b/drivers/rtc/rtc-isl12022.c
> @@ -257,6 +257,8 @@ static int isl12022_probe(struct i2c_client *client,
>  static const struct of_device_id isl12022_dt_match[] = {
>  	{ .compatible = "isl,isl12022" }, /* for backward compat., don't use */
>  	{ .compatible = "isil,isl12022" },
> +	{ .compatible = "isl,isl12020" }, /* for backward compat., don't use */

Please, do not add this compatible string.

> +	{ .compatible = "isil,isl12020" },

You also need to document this string in Documentation/devicetree/bindings/rtc/trivial-rtc.yaml

>  	{ },
>  };
>  MODULE_DEVICE_TABLE(of, isl12022_dt_match);
> @@ -264,6 +266,7 @@ MODULE_DEVICE_TABLE(of, isl12022_dt_match);
>  
>  static const struct i2c_device_id isl12022_id[] = {
>  	{ "isl12022", 0 },
> +	{ "isl12020", 0 },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(i2c, isl12022_id);
> -- 
> 2.33.0
> 

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com