linux-kernel - Re: [PATCH v3 10/11] spi: dw: Add support for Pensando Elba SoC

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Message-ID: <CAHp75Vejm7exqWY9XcaJQCqLgUvoM5E93=0JV2Wew7T6WzTKpg@mail.gmail.com>
Date:   Sun, 31 Oct 2021 15:19:48 +0200
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Brad Larson <brad@...sando.io>
Cc:     linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Mark Brown <broonie@...nel.org>,
        Serge Semin <fancer.lancer@...il.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Olof Johansson <olof@...om.net>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        linux-spi <linux-spi@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 10/11] spi: dw: Add support for Pensando Elba SoC

On Mon, Oct 25, 2021 at 4:54 AM Brad Larson <brad@...sando.io> wrote:
>
> The Pensando Elba SoC includes a DW apb_ssi v4 controller
> with device specific chip-select control.  The Elba SoC
> provides four chip-selects where the native DW IP supports
> two chip-selects.

...

> +static void dw_spi_elba_set_cs(struct spi_device *spi, bool enable)
> +{
> +       struct dw_spi *dws = spi_master_get_devdata(spi->master);
> +       struct dw_spi_mmio *dwsmmio = container_of(dws, struct dw_spi_mmio, dws);
> +       struct dw_spi_elba *dwselba = dwsmmio->priv;

> +       u8 cs = spi->chip_select;

Much easier to maintain and follow the code (in the future) if this
assignment is broken to two parts, i.e...

> +

...like this

       cs = spi->chip_select;
       if (cs < 2) {
         ...

> +       if (cs < 2) {
> +               /* overridden native chip-select */
> +               elba_spics_set_cs(dwselba, spi->chip_select, enable);
> +       }

...

> +       regmap = syscon_node_to_regmap(args.np);
> +       if (IS_ERR(regmap)) {
> +               dev_err(&pdev->dev, "could not map pensando,spics\n");
> +               return PTR_ERR(regmap);
> +       }

Why not return dev_err_probe()?

-- 
With Best Regards,
Andy Shevchenko