Re: [PATCH] soc: imx8mp: support 128 bits UID

From: Shawn Guo <shawnguo@kernel.org>
To: "Peng Fan (OSS)" <peng.fan@oss.nxp.com>
Cc: s.hauer@pengutronix.de, kernel@pengutronix.de,
	festevam@gmail.com, linux-imx@nxp.com,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org, Peng Fan <peng.fan@nxp.com>
Subject: Re: [PATCH] soc: imx8mp: support 128 bits UID
Date: Tue, 10 Oct 2023 10:38:51 +0800	[thread overview]
Message-ID: <20231010023851.GN819755@dragon> (raw)
In-Reply-To: <20231008083808.1517132-1-peng.fan@oss.nxp.com>

On Sun, Oct 08, 2023 at 04:38:08PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@nxp.com>
> 
> Current driver only supports 64bits UID for i.MX8MP, but
> i.MX8MP UID is actually 128bits, the high 64bits is at 0xE00.
> So update driver to support it.
> 
> Signed-off-by: Peng Fan <peng.fan@nxp.com>
> ---
>  drivers/soc/imx/soc-imx8m.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/soc/imx/soc-imx8m.c b/drivers/soc/imx/soc-imx8m.c
> index ec87d9d878f3..5dcc227d41c0 100644
> --- a/drivers/soc/imx/soc-imx8m.c
> +++ b/drivers/soc/imx/soc-imx8m.c
> @@ -24,6 +24,7 @@
>  #define OCOTP_UID_HIGH			0x420
>  
>  #define IMX8MP_OCOTP_UID_OFFSET		0x10
> +#define IMX8MP_OCOTP_UID_HIGH		0xE00

Lowercase for hex values just like other macros in the file?

>  
>  /* Same as ANADIG_DIGPROG_IMX7D */
>  #define ANADIG_DIGPROG_IMX8MM	0x800
> @@ -34,6 +35,7 @@ struct imx8_soc_data {
>  };
>  
>  static u64 soc_uid;
> +static u64 soc_uid_h;
>  
>  #ifdef CONFIG_HAVE_ARM_SMCCC
>  static u32 imx8mq_soc_revision_from_atf(void)
> @@ -122,8 +124,15 @@ static void __init imx8mm_soc_uid(void)
>  	soc_uid <<= 32;
>  	soc_uid |= readl_relaxed(ocotp_base + OCOTP_UID_LOW + offset);
>  
> +	if (offset) {
> +		soc_uid_h = readl_relaxed(ocotp_base + IMX8MP_OCOTP_UID_HIGH + 0x10);
> +		soc_uid_h <<= 32;
> +		soc_uid_h |= readl_relaxed(ocotp_base + IMX8MP_OCOTP_UID_HIGH);
> +	}
> +
>  	clk_disable_unprepare(clk);
>  	clk_put(clk);
> +

Unrelated change.

>  	iounmap(ocotp_base);
>  	of_node_put(np);
>  }
> @@ -222,7 +231,12 @@ static int __init imx8_soc_init(void)
>  		goto free_soc;
>  	}
>  
> -	soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
> +	if (soc_uid_h) {
> +		soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX%016llX",
> +							soc_uid_h, soc_uid);
> +	} else {
> +		soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
> +	}

Unnecessary braces for single statement.

Also it would be nice to have a newline here.

Shawn

>  	if (!soc_dev_attr->serial_number) {
>  		ret = -ENOMEM;
>  		goto free_rev;
> -- 
> 2.37.1
> 

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