linux-kernel - Re: [PATCH] SPI: Add driver for Cadence SPI controller

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Date:	Mon, 17 Mar 2014 14:30:33 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Michal Simek <monstr@...str.eu>
Cc:	Rob Herring <robherring2@...il.com>,
	Harini Katakam <harinik@...inx.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Rob Landley <rob@...dley.net>, Mark Brown <broonie@...nel.org>,
	Grant Likely <grant.likely@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>
Subject: Re: [PATCH] SPI: Add driver for Cadence SPI controller

On Mon, Mar 17, 2014 at 2:22 PM, Michal Simek <monstr@...str.eu> wrote:
>>> +       return 0;
>>> +}
>>> +
>>> +static SIMPLE_DEV_PM_OPS(cdns_spi_dev_pm_ops, cdns_spi_suspend,
>>> +                        cdns_spi_resume);
>>> +
>>> +/* Work with hotplug and coldplug */
>>> +MODULE_ALIAS("platform:" CDNS_SPI_NAME);
>>
>> Not sure, but I don't think this should be needed.
>
> I don't know too.

A plain platform device driver needs the MODULE_ALIAS, unless there's
a "MODULE_DEVICE_TABLE(platform, ...)", which doesn't exist in this driver.

However, as the driver fails in the absence of DT:

      ret = of_property_read_u16(pdev->dev.of_node, "num-chip-select",
                                  &master->num_chipselect);
      if (ret < 0) {
              dev_err(&pdev->dev, "couldn't determine num-chip-select\n");
              goto clk_dis_all;
      }

it won't work (yet) as a plain platform device driver.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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