linux-kernel - Re: [PATCH V2 1/2] soc: imx: Add SCU SoC info driver support

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Message-ID: <AM0PR04MB6434C2BCE2116836CFC0FEBFEE090@AM0PR04MB6434.eurprd04.prod.outlook.com>
Date:   Wed, 15 May 2019 10:04:46 +0000
From:   Leonard Crestez <leonard.crestez@....com>
To:     Anson Huang <anson.huang@....com>
CC:     "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
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        Abel Vesa <abel.vesa@....com>,
        "robh@...nel.org" <robh@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
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        dl-linux-imx <linux-imx@....com>,
        Aisheng Dong <aisheng.dong@....com>
Subject: Re: [PATCH V2 1/2] soc: imx: Add SCU SoC info driver support

On 15.05.2019 11:32, Anson Huang wrote:
> Add i.MX SCU SoC info driver to support i.MX8QXP SoC, introduce
> driver dependency into Kconfig as CONFIG_IMX_SCU must be
> selected to support i.MX SCU SoC driver, also need to use
> platform driver model to make sure IMX_SCU driver is probed
> before i.MX SCU SoC driver.
> 
> With this patch, SoC info can be read from sysfs:

> +	id = of_match_node(imx_scu_soc_match, root);
> +	if (!id) {
> +		of_node_put(root);
> +		return -ENODEV;
> +	}

Perhaps this check should be moved from imx_scu_soc_probe to 
imx_scu_soc_init? As far as I can tell this "probe" function will be 
attempted on all SOCs (even non-imx). Better to check if we're on a 
SCU-based soc early and avoid temporary allocations.

> +module_init(imx_scu_soc_init);
> +module_exit(imx_scu_soc_exit);

Please don't make this a module

--
Regards,
Leonard