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

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Date:   Wed, 15 May 2019 14:47:18 +0300
From:   Daniel Baluta <daniel.baluta@...il.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>,
        "festevam@...il.com" <festevam@...il.com>,
        "agross@...nel.org" <agross@...nel.org>,
        "maxime.ripard@...tlin.com" <maxime.ripard@...tlin.com>,
        "olof@...om.net" <olof@...om.net>,
        "horms+renesas@...ge.net.au" <horms+renesas@...ge.net.au>,
        "jagan@...rulasolutions.com" <jagan@...rulasolutions.com>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        Leonard Crestez <leonard.crestez@....com>,
        "marc.w.gonzalez@...e.fr" <marc.w.gonzalez@...e.fr>,
        "dinguyen@...nel.org" <dinguyen@...nel.org>,
        "enric.balletbo@...labora.com" <enric.balletbo@...labora.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        Abel Vesa <abel.vesa@....com>,
        "robh@...nel.org" <robh@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH V2 1/2] soc: imx: Add SCU SoC info driver support

Hi Anson,

Since you are going to send a new version for this please consider my
comment inline.

<snip>

> +static u32 imx8qxp_soc_revision(void)
> +{
> +       struct imx_sc_msg_misc_get_soc_id msg;
> +       struct imx_sc_rpc_msg *hdr = &msg.hdr;
> +       u32 rev = 0;

No need to initialize this here.

> +       int ret;
> +
> +       hdr->ver = IMX_SC_RPC_VERSION;
> +       hdr->svc = IMX_SC_RPC_SVC_MISC;
> +       hdr->func = IMX_SC_MISC_FUNC_GET_CONTROL;
> +       hdr->size = 3;
> +
> +       msg.data.send.control = IMX_SC_C_ID;
> +       msg.data.send.resource = IMX_SC_R_SYSTEM;
> +
> +       ret = imx_scu_call_rpc(soc_ipc_handle, &msg, true);
> +       if (ret) {
> +               dev_err(&imx_scu_soc_pdev->dev,
> +                       "get soc info failed, ret %d\n", ret);
> +               /* return 0 means getting revision failed */

Just return 0 here. No need for rev.
> +               return rev;
> +       }
> +