linux-kernel - Re: [PATCH v2 2/2] mmc: sdhci-npcm: Add NPCM SDHCI driver

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Message-ID: <CAP6Zq1gi7-pA9wdO3=V9Uf0+pKPTHwWw66MfbYmOwodoXeRDqA@mail.gmail.com>
Date:   Mon, 5 Dec 2022 13:20:10 +0200
From:   Tomer Maimon <tmaimon77@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     ulf.hansson@...aro.org, avifishman70@...il.com,
        tali.perry1@...il.com, joel@....id.au, venture@...gle.com,
        yuenn@...gle.com, benjaminfair@...gle.com, adrian.hunter@...el.com,
        skhan@...uxfoundation.org, davidgow@...gle.com,
        pbrobinson@...il.com, gsomlo@...il.com, briannorris@...omium.org,
        arnd@...db.de, krakoczy@...micro.com, openbmc@...ts.ozlabs.org,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] mmc: sdhci-npcm: Add NPCM SDHCI driver

Hi Andy,

Thanks for your comments.

On Mon, 5 Dec 2022 at 12:54, Andy Shevchenko <andy.shevchenko@...il.com> wrote:
>
> On Mon, Dec 5, 2022 at 10:54 AM Tomer Maimon <tmaimon77@...il.com> wrote:
> >
> > Add Nuvoton NPCM BMC sdhci-pltfm controller driver.
>
> Thank you for an update, my comments below.
>
> ...
>
> > +config MMC_SDHCI_NPCM
>
> >  config MMC_SDHCI_IPROC
>
> Perhaps after IPROC?
Will be done in the next version.
>
> ...
>
> > @@ -97,6 +97,7 @@ obj-$(CONFIG_MMC_SDHCI_MICROCHIP_PIC32)       += sdhci-pic32.o
> >  obj-$(CONFIG_MMC_SDHCI_BRCMSTB)                += sdhci-brcmstb.o
> >  obj-$(CONFIG_MMC_SDHCI_OMAP)           += sdhci-omap.o
> >  obj-$(CONFIG_MMC_SDHCI_SPRD)           += sdhci-sprd.o
> > +obj-$(CONFIG_MMC_SDHCI_NPCM)           += sdhci-npcm.o
>
> Perhaps after IPROC? (There is a group of platform drivers slightly
> below than here)
Will be done in the next version.
>
> >  obj-$(CONFIG_MMC_CQHCI)                        += cqhci.o
>
> ...
>
> > +#include <linux/clk.h>
> > +#include <linux/err.h>
> > +#include <linux/io.h>
> > +#include <linux/mmc/host.h>
> > +#include <linux/mmc/mmc.h>
> > +#include <linux/module.h>
>
> I guess platform_device.h is missing here.
Build and work without platform_device.h, do I need it for module use?
>
> ...
>
> > +static int npcm_sdhci_probe(struct platform_device *pdev)
> > +{
> > +       struct sdhci_pltfm_host *pltfm_host;
> > +       struct sdhci_host *host;
> > +       u32 caps;
> > +       int ret;
> > +
> > +       host = sdhci_pltfm_init(pdev, &npcm_sdhci_pdata, 0);
> > +       if (IS_ERR(host))
> > +               return PTR_ERR(host);
> > +
> > +       pltfm_host = sdhci_priv(host);
>
> > +       pltfm_host->clk = devm_clk_get_optional(&pdev->dev, NULL);
>
> You can't mix devm with non-devm in this way.
Can you explain what you mean You can't mix devm with non-devm in this
way, where is the mix?
In version 1 used devm_clk_get, is it problematic?
>
> > +       if (IS_ERR(pltfm_host->clk))
> > +               return PTR_ERR(pltfm_host->clk);
> > +
> > +       ret = clk_prepare_enable(pltfm_host->clk);
> > +       if (ret)
> > +               return ret;
> > +
> > +       caps = sdhci_readl(host, SDHCI_CAPABILITIES);
> > +       if (caps & SDHCI_CAN_DO_8BIT)
> > +               host->mmc->caps |= MMC_CAP_8_BIT_DATA;
> > +
> > +       ret = mmc_of_parse(host->mmc);
> > +       if (ret)
> > +               goto err_sdhci_add;
> > +
> > +       ret = sdhci_add_host(host);
> > +       if (ret)
> > +               goto err_sdhci_add;
>
> Why can't you use sdhci_pltfm_register()?
two things are missing in sdhci_pltfm_register
1. clock.
2. Adding SDHCI_CAN_DO_8BIT capability according the eMMC capabilities.
>
> > +       return 0;
> > +
> > +err_sdhci_add:
> > +       clk_disable_unprepare(pltfm_host->clk);
> > +       sdhci_pltfm_free(pdev);
> > +       return ret;
> > +}
>
> Missing ->remove() due to above.
Will check
>
> Have you tried to compile as a module and then remove and insert it
> several times?
will try
>
> --
> With Best Regards,
> Andy Shevchenko

Best regards,

Tomer