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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Mon, 23 May 2022 12:44:06 +0200
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Subject: Re: [PATCH v1 12/19] reset: npcm: Add NPCM8XX support
To:     Tomer Maimon <tmaimon77@gmail.com>
Cc:     Avi Fishman <avifishman70@gmail.com>,
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On Sun, May 22, 2022 at 5:50 PM Tomer Maimon <tmaimon77@gmail.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