linux-kernel - Re: [PATCH v3 3/3] EDAC: nuvoton: Add NPCM memory controller driver

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Message-ID: <143db512-0223-1553-c141-2dc24a23c430@canonical.com>
Date:   Mon, 14 Mar 2022 08:36:15 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Medad Young <medadyoung@...il.com>
Cc:     rric@...nel.org, james.morse@....com, tony.luck@...el.com,
        mchehab@...nel.org, bp@...en8.de, robh+dt@...nel.org,
        Benjamin Fair <benjaminfair@...gle.com>,
        Nancy Yuen <yuenn@...gle.com>,
        Patrick Venture <venture@...gle.com>, KWLIU@...oton.com,
        YSCHU@...oton.com, JJLIU0@...oton.com, KFTING <KFTING@...oton.com>,
        avifishman70@...il.com, tmaimon77@...il.com, tali.perry1@...il.com,
        ctcchien@...oton.com, linux-edac@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        openbmc@...ts.ozlabs.org
Subject: Re: [PATCH v3 3/3] EDAC: nuvoton: Add NPCM memory controller driver

On 14/03/2022 06:32, Medad Young wrote:
> Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com> 於 2022年3月11日
> 週五 下午5:15寫道：
>>
>> On 11/03/2022 02:42, Medad CChien wrote:
>>> Add support for Nuvoton NPCM SoC.
>>>
>>> Signed-off-by: Medad CChien <ctcchien@...oton.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 = &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 = -ENODEV;
>>> +     int irq;
>>> +
>>> +     id = 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

Yes and how NULL can happen for OF-only driver? Unless I missed
something and this is not an OF-only driver? Do you allow any other
matching methods?

Best regards,
Krzysztof