linux-kernel - Re: [PATCH v3] i2c: imx: add imx7d compatible string for applying errata ERR007805

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Message-ID: <Z2O1PFr4ZQHXTsrX@pengutronix.de>
Date: Thu, 19 Dec 2024 06:55:08 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: Carlos Song <carlos.song@....com>
Cc: andi.shyti@...nel.org, frank.li@....com, kernel@...gutronix.de,
	shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com,
	linux-i2c@...r.kernel.org, imx@...ts.linux.dev,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Haibo Chen <haibo.chen@....com>
Subject: Re: [PATCH v3] i2c: imx: add imx7d compatible string for applying
 errata ERR007805

On Wed, Dec 18, 2024 at 12:42:38PM +0800, Carlos Song wrote:
> Compatible string "fsl,imx7d-i2c" is not exited at i2c-imx driver
                                       do not exist?
> compatible string table, at the result, "fsl,imx21-i2c" will be
> matched, but it will cause errata ERR007805 not be applied in fact.
> 
> So Add "fsl,imx7d-i2c" compatible string in i2c-imx driver to apply
> the errata ERR007805(https://www.nxp.com/webapp/Download?colCode=
> IMX7DS_2N09P).

This link is not working, may be this one:
https://www.nxp.com/docs/en/errata/IMX7DS_3N09P.pdf

More practical is to include the erratum text with list of affected SoC
variants.

> "fsl,imx7d-i2c" already is documented in binding doc. This errata

s/errata/erratum

Errata is plural
Erratum is singular

> fix has been included in imx6_i2c_hwdata and it is the same in all
> I.MX6/7/8, so just reuse it.
> 

Please Fixes tag, this patch should go stable:
Fixes: 39c025721d70 ("i2c: imx: Implement errata ERR007805 or e7805 bus frequency limit")
Cc: stable@...r.kernel.org

> Signed-off-by: Carlos Song <carlos.song@....com>
> Signed-off-by: Haibo Chen <haibo.chen@....com>

With fixes in the commit message you can add my:
Acked-by: Oleksij Rempel <o.rempel@...gutronix.de>

> ---
> Change for V3:
> - No ACK, so resend this patch.
> Change for V2:
> - I have tried to fix this issue at imx7s.dtsi in V1, according to
>   the community suggestion, I make V2 patch for i2c-imx driver to
>   avoid updating the FDT to fix an errata. Discussion in V1:
>   Subject: [PATCH] ARM: dts: imx7s: change i2c compatible string for applying errata ERR007805
>   Message-ID: <20241021031148.2682015-1-carlos.song@....com> (raw)
> ---
>  drivers/i2c/busses/i2c-imx.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
> index 350346a7892c..9d5caa032c5c 100644
> --- a/drivers/i2c/busses/i2c-imx.c
> +++ b/drivers/i2c/busses/i2c-imx.c
> @@ -335,6 +335,7 @@ static const struct of_device_id i2c_imx_dt_ids[] = {
>  	{ .compatible = "fsl,imx6sll-i2c", .data = &imx6_i2c_hwdata, },
>  	{ .compatible = "fsl,imx6sx-i2c", .data = &imx6_i2c_hwdata, },
>  	{ .compatible = "fsl,imx6ul-i2c", .data = &imx6_i2c_hwdata, },
> +	{ .compatible = "fsl,imx7d-i2c", .data = &imx6_i2c_hwdata, },
>  	{ .compatible = "fsl,imx7s-i2c", .data = &imx6_i2c_hwdata, },
>  	{ .compatible = "fsl,imx8mm-i2c", .data = &imx6_i2c_hwdata, },
>  	{ .compatible = "fsl,imx8mn-i2c", .data = &imx6_i2c_hwdata, },
> -- 
> 2.34.1
> 
> 

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