linux-kernel - Re: [PATCH V4 5/7] ARM: dts: Enable Broadcom Cygnus SoC

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Date:	Fri, 10 Oct 2014 12:11:37 -0700
From:	Scott Branden <sbranden@...adcom.com>
To:	Arnd Bergmann <arnd@...db.de>
CC:	Christian Daudt <bcm@...thebug.org>,
	Matt Porter <mporter@...aro.org>,
	Russell King <linux@....linux.org.uk>,
	<bcm-kernel-feedback-list@...adcom.com>,
	Mike Turquette <mturquette@...aro.org>,
	Alex Elder <elder@...aro.org>,
	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>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Joe Perches <joe@...ches.com>,
	"Mauro Carvalho Chehab" <m.chehab@...sung.com>,
	Antti Palosaari <crope@....fi>,
	JD Zheng <jdzheng@...adcom.com>, Ray Jui <rjui@...adcom.com>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
	Jonathan Richardson <jonathar@...adcom.com>
Subject: Re: [PATCH V4 5/7] ARM: dts: Enable Broadcom Cygnus SoC

On 14-10-10 03:08 AM, Arnd Bergmann wrote:
> On Thursday 09 October 2014 15:44:29 Scott Branden wrote:
>> +
>> +               lcpll: lcpll@...1d02c {
>> +                       #clock-cells = <0>;
>> +                       compatible = "brcm,cygnus-lcpll-clk";
>> +                       reg = <0x0301d02c 0x1c>;
>> +                       clocks = <&osc>;
>> +               };
>> +
>> +               genpll: genpll@...1d000 {
>> +                       #clock-cells = <0>;
>> +                       compatible = "brcm,cygnus-genpll-clk";
>> +                       reg = <0x0301d000 0x2c>,
>> +                                 <0x180AA024 0x4>,
>> +                                 <0x0301C020 0x4>;
>> +                       clocks = <&osc>;
>> +               };
>> +
>
> To be honest, I'm not too happy about the way you specify a single
> register for each clock as a global 'reg' property.
I'm not happy with this either.  Will rework.
>
> Presumably each of these registers is part of an IP block that does
> multiple things, so it would be better to start out with a binding
> for each IP block. How many of these blocks are used for clocks, and
> what do they do?
Clocks are a little scattered in the chip and don't make a lot of sense 
for easy software programming.  Will look at how to change bindings so 
they are flexible to work on other generations.
>
> 	Arnd
>

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