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

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Date:	Mon, 11 Jul 2016 12:24:21 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Wan Zongshun <vw@...mu.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	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 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.

> > - 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