[RFC PATCH 11/11] ARM: DT: Add support to system control module for OMAP4

On 5/30/2012 11:05 AM, Konstantin Baydarov wrote:

On 05/30/2012 12:38 PM, Cousson, Benoit wrote:

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On 5/29/2012 11:49 AM, Konstantin Baydarov wrote:

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Hi, Eduardo.

On 05/25/2012 12:26 PM, Eduardo Valentin wrote:

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This patch add device tree entries on OMAP4 based boards for
System Control Module (SCM).

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I believe that CPU-specific bandgap definition should be moved to
bard specific dts.

Mmm, why, since it is CPU specific and not board specific. I has to
be in the SoC file.

Speaking about omap4430 - omap4430 bandgap differs from omap4460, so
if omap4430 bandgap support will be added to omap-bandgap driver the
version of bandgap should specified in dts file. omap4.dtsi is a
common for omap4 boards, that is why I'm suggesting to move bandgap
description to probably board specific file.

OK, I got your point, but in that case we could potentially define a 
omap4460.dtsi file.

Another solution is to
determine bandgap type in driver probe function, but in that case
"ti,omap4460-bandgap" in omap4.dtsi should be replaced to
"ti,omap4-bandgap".

Yes, this is the best solution, but that assume that we can identify the 
control module version from the HW, which is not necessarily true :-(

The IP_REVISION (offset = 0) value are unfortunately not documented, so 
we should read it to check if they are different from omap4430 and 4460.

The bitfield layout in that register is:

IP_REV_MAJOR: 8..10
IP_REV_CUSTOM: 6..7
IP_REV_MINOR: 0..5

Regards,
Benoit