linux-kernel - Re: [PATCH v1 12/19] reset: npcm: Add NPCM8XX support

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Message-ID: <CAK8P3a0PKvqpTjNeKUm6EnxpmJAtmk1jv+b4YXxr+fXFpsWXtw@mail.gmail.com>
Date:   Mon, 23 May 2022 12:44:06 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Tomer Maimon <tmaimon77@...il.com>
Cc:     Avi Fishman <avifishman70@...il.com>,
        Tali Perry <tali.perry1@...il.com>,
        Joel Stanley <joel@....id.au>,
        Patrick Venture <venture@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Benjamin Fair <benjaminfair@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        gregkh <gregkh@...uxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Arnd Bergmann <arnd@...db.de>,
        Olof Johansson <olof@...om.net>,
        Jiri Slaby <jirislaby@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        Vinod Koul <vkoul@...nel.org>,
        Biju Das <biju.das.jz@...renesas.com>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>,
        robert.hancock@...ian.com,
        "nathan=20Neusch=C3=A4fer?=" <j.neuschaefer@....net>,
        Lubomir Rintel <lkundrak@...sk>, SoC Team <soc@...nel.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        LINUXWATCHDOG <linux-watchdog@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v1 12/19] reset: npcm: Add NPCM8XX support

On Sun, May 22, 2022 at 5:50 PM Tomer Maimon <tmaimon77@...il.com> wrote:

>  static const struct of_device_id npcm_rc_match[] = {
>         { .compatible = "nuvoton,npcm750-reset"},
> +       { .compatible = "nuvoton,npcm845-reset"},
>         { }
>  };
> +/*
> + *  The following procedure should be observed in USB PHY, USB device and
> + *  USB host initialization at BMC boot
> + */
> +static int npcm_usb_reset(struct platform_device *pdev, struct npcm_rc_data *rc)
> +{
> +       struct device_node *np = pdev->dev.of_node;
> +       struct device *dev = &pdev->dev;
> +
> +       rc->gcr_regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "syscon");
> +       if (IS_ERR(rc->gcr_regmap)) {
> +               dev_err(&pdev->dev, "Failed to find gcr syscon");
> +               return PTR_ERR(rc->gcr_regmap);
> +       }
> +
> +       if (of_device_is_compatible(np, "nuvoton,npcm750-reset"))
> +               npcm_usb_reset_npcm7xx(rc);
> +       else if (of_device_is_compatible(np, "nuvoton,npcm845-reset"))
> +               npcm_usb_reset_npcm8xx(rc);
> +       else
> +               return -ENODEV;
>

In place of the string comparison in of_device_is_compatible(), maybe just use
the .data field of the of_device_id structure to point to the actual
reset function.

Alternatively, register two separate platform_driver instances here and
use separate probe functions that do the soc specific bits and call into
shared functions for the bits that are the same.

       Arnd