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References: <20220311014245.4612-1-ctcchien@nuvoton.com> <20220311014245.4612-4-ctcchien@nuvoton.com>
 <1f5e1e49-4ab0-5e06-fa8f-2a11b0fd1df9@canonical.com>
In-Reply-To: <1f5e1e49-4ab0-5e06-fa8f-2a11b0fd1df9@canonical.com>
From:   Medad Young <medadyoung@gmail.com>
Date:   Mon, 14 Mar 2022 13:32:40 +0800
Message-ID: <CAHpyw9dHau348qJB6g+fCcKqWByUsRHAGwb_mdUg=hjhW+xNsw@mail.gmail.com>
Subject: Re: [PATCH v3 3/3] EDAC: nuvoton: Add NPCM memory controller driver
To:     Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Cc:     rric@kernel.org, james.morse@arm.com, tony.luck@intel.com,
        mchehab@kernel.org, bp@alien8.de, robh+dt@kernel.org,
        Benjamin Fair <benjaminfair@google.com>,
        Nancy Yuen <yuenn@google.com>,
        Patrick Venture <venture@google.com>, KWLIU@nuvoton.com,
        YSCHU@nuvoton.com, JJLIU0@nuvoton.com, KFTING <KFTING@nuvoton.com>,
        avifishman70@gmail.com, tmaimon77@gmail.com, tali.perry1@gmail.com,
        ctcchien@nuvoton.com, linux-edac@vger.kernel.org,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
        openbmc@lists.ozlabs.org
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Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com> =E6=96=BC 2022=E5=
=B9=B43=E6=9C=8811=E6=97=A5
=E9=80=B1=E4=BA=94 =E4=B8=8B=E5=8D=885:15=E5=AF=AB=E9=81=93=EF=BC=9A
>
> On 11/03/2022 02:42, Medad CChien wrote:
> > Add support for Nuvoton NPCM SoC.
> >
> > Signed-off-by: Medad CChien <ctcchien@nuvoton.com>
> > ---
> >  drivers/edac/Kconfig     |   9 +
> >  drivers/edac/Makefile    |   1 +
> >  drivers/edac/npcm_edac.c | 714 +++++++++++++++++++++++++++++++++++++++
> >  3 files changed, 724 insertions(+)
> >  create mode 100644 drivers/edac/npcm_edac.c
> >
> > diff --git a/drivers/edac/Kconfig b/drivers/edac/Kconfig
> > index 58ab63642e72..757e1d160640 100644
> > --- a/drivers/edac/Kconfig
> > +++ b/drivers/edac/Kconfig
> > @@ -539,4 +539,13 @@ config EDAC_DMC520
> >         Support for error detection and correction on the
> >         SoCs with ARM DMC-520 DRAM controller.
> >
> > +config EDAC_NPCM
> > +     tristate "Nuvoton NPCM DDR Memory Controller"
> > +     depends on ARCH_NPCM
>
> || COMPILE_TEST
> (and test if it compiles)
>
> (...)
>
> > +
> > +MODULE_DEVICE_TABLE(of, npcm_edac_of_match);
> > +
> > +static int npcm_edac_mc_probe(struct platform_device *pdev)
> > +{
> > +     const struct npcm_edac_platform_data *npcm_chip;
> > +     struct device *dev =3D &pdev->dev;
> > +     struct edac_mc_layer layers[1];
> > +     const struct of_device_id *id;
> > +     struct priv_data *priv_data;
> > +     struct mem_ctl_info *mci;
> > +     struct resource *res;
> > +     void __iomem *reg;
> > +     int ret =3D -ENODEV;
> > +     int irq;
> > +
> > +     id =3D of_match_device(npcm_edac_of_match, &pdev->dev);
> > +     if (!id)
> > +             return -ENODEV;
>
> Why do you need it? How such case is even possible?
this driver is used for two nuvoton SOCs, one is NPCM845 and the other
is NPCM750

>
> > +
> > +     npcm_chip =3D of_device_get_match_data(&pdev->dev);
> > +     if (!npcm_chip)
> > +             return -ENODEV;
>
> I wonder, how is it possible to have here NULL?
>
> Best regards,
> Krzysztof