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

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Date:	Mon, 11 Jul 2016 18:28:57 +0800
From:	Wan ZongShun <mcuos.com@...il.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Wan Zongshun <vw@...mu.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	Russell King <linux@...linux.org.uk>,
	devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
	Jason Cooper <jason@...edaemon.net>,
	Daniel Lezcano <daniel.lezcano@...aro.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	p.zabel@...gutronix.de, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v2 06/10] soc: Add SoC specific driver support for nuc900

2016-07-11 18:24 GMT+08:00 Arnd Bergmann <arnd@...db.de>:
> On Monday, July 11, 2016 5:07:01 PM CEST Wan Zongshun wrote:
>>
>> 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?
>
> Ok.

Maybe I also can set versionid as soc name partly, like
nuc970-version1,nuc970-version2? and then set the to soc_id, make
sense?


>
>> > - 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?
>
> I think "model" is best here, but see what the others do.
>
>         Arnd
>



-- 
---
Vincent Wan(Zongshun)
www.mcuos.com