Subject: [linux-sunxi] [PATCH] i2c: mv64xxx: The n clockdiv factor is 0 based on sunxi SoCs

From: [email-masked] (Andrew Lunn)
Date: Sun, 27 Sep 2015 18:53:03 +0200

On Sun, Sep 27, 2015 at 06:05:35PM +0200, Olliver Schinagl wrote:
> Hey Hans,
> 
> On 27-09-15 16:57, Hans de Goede wrote:
> >According to the datasheets to n factor for dividing the tclk is
> >2 to the power n on Allwinner SoCs, not 2 to the power n + 1 as it is
> >on other mv64xxx implementations.
> Ah!

Just to be sure, i checked Kirkwood, Armada XP and Armada 370
datasheets. They all say n+1.

> >+	if (of_device_is_compatible(np, "allwinner,sun4i-a10-i2c") ||
> >+	    of_device_is_compatible(np, "allwinner,sun6i-a31-i2c"))

Rather than have to extend this list every so often, how about adding
a helper of_device_is_compatible_vendor(), so you can just have:

> >+	if (of_device_is_compatible_vendor(np, "allwinner")

  Andrew