linux-kernel - Re: [PATCH v2 06/10] soc: Add SoC specific driver support for nuc900

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Date:	Mon, 11 Jul 2016 17:07:01 +0800
From:	Wan Zongshun <vw@...mu.org>
To:	Arnd Bergmann <arnd@...db.de>, linux-arm-kernel@...ts.infradead.org
Cc:	Russell King <linux@...linux.org.uk>, devicetree@...r.kernel.org,
	linux-clk@...r.kernel.org, jason@...edaemon.net,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-kernel@...r.kernel.org, p.zabel@...gutronix.de,
	Thomas Gleixner <tglx@...utronix.de>,
	Wan Zongshun <mcuos.com@...il.com>
Subject: Re: [PATCH v2 06/10] soc: Add SoC specific driver support for nuc900



On 2016年07月11日 16:03, Arnd Bergmann wrote:
> On Sunday, July 10, 2016 3:27:26 PM CEST Wan Zongshun wrote:
>> +       ret = of_property_read_string(np, "compatible", &soc_dev_attr->soc_id);
>> +       if (ret)
>>                return -EINVAL;
>> +
>> +       soc_dev_attr->machine = "NUC900EVB";
>> +       soc_dev_attr->family = "NUC900";
>> +       soc_dev = soc_device_register(soc_dev_attr);
>> +       if (IS_ERR(soc_dev)) {
>> +               kfree(soc_dev_attr);
>> +               return -ENODEV;
>> +       }
>> +
>> +       ret = regmap_read(syscon_regmap, GCR_CHIPID, &nuc900_chipid);
>> +       if (ret)
>> +               return -ENODEV;
>> +
>> +       device_create_file(soc_device_to_device(soc_dev), &nuc900_chipid_attr);
>> +       device_create_file(soc_device_to_device(soc_dev), &nuc900_version_attr);
>> +
>> +       dev_info(&pdev->dev, "Nuvoton Chip ID: 0x%x, Version ID:0x%x\n",
>> +                nuc900_chipid & GCR_CHIPID_MASK,
>> +                (nuc900_chipid >> 24) & 0xff);
>
> I'm still a bit unsure about the set of attributes here.
>
> - The "soc_id" is read from the device tree from the field that contains
>    the board name, I think for consistency you should try to map the
>    GCR_CHIPID to the name of the SoC and assign that here

I will try to get chipid and map it to soc name like: “nuc970”, "nuc910".

And I will set this soc name to soc_id, ok?

>
> - The "machine" is hardcoded to "NUC900EVB", which in turn looks like
>    a particular board but not the one you are running on. Maybe read
>    that from the DT instead?

Should I read nuc970-evb.dts's "model" or "compatible" properties?

>
> - The "revision" is not filled at all, I would suggest using something
>    derived from the GCR_CHIPID register here
>
> - you have two nonstandard attributes "chipid" and "version", which
>    I'd hope to avoid -- the set of standard attributes is supposed to
>    give enough information about the machine, and platform independent
>    user space will never read those.
>
> 	Arnd
>
>