linux-kernel - Re: [Patch v3 0/5] Introduce keystone reset driver

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Date:	Tue, 20 May 2014 21:27:48 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Ivan Khoronzhuk <ivan.khoronzhuk@...com>
Cc:	Santosh Shilimkar <santosh.shilimkar@...com>, dbaryshkov@...il.com,
	dwmw2@...radead.org, ijc+devicetree@...lion.org.uk,
	robh+dt@...nel.org, pawel.moll@....com, mark.rutland@....com,
	galak@...eaurora.org, grant.likely@...aro.org,
	rdunlap@...radead.org, linux@....linux.org.uk,
	grygorii.strashko@...com, olof@...om.net, w-kwok2@...com,
	sboyd@...eaurora.org, devicetree@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [Patch v3 0/5] Introduce keystone reset driver

On Tuesday 20 May 2014 21:35:23 Ivan Khoronzhuk wrote:
> Thank for the note.
> 
> Ok.
> 
> Memory map:
> [00 02310000 - 00 023101FF] size=512 PLL Controller
> [00 02620000 - 00 02620FFF] size=4K device state control registers
> 
> I'll define in DT two new syscon compatible nodes like:
> 
>          pllctrl: pll_controller {
>              compatible = "syscon";
>              reg = <0x2310000 0x200>;
>          };
> 
>          devctrl: device_state_control {
>              compatible = "syscon";
>              reg = <0x2620000 0x1000>;
>          };

Please add a well-defined compatible-string in addition to "syscon" as
well.

> then correct reset-controller node like:
> 
>          rstctrl: reset-controller {
>              compatible = "ti,keystone-reset";
>              reg = <0xE4 0x10>, <0x328 0x10>;
>              reg-names = "pllregs", "muxregs";
>              syscon1 = <&pllctrl>;
>              syscon2 = <&devctrl>;
>              ti,wdt_list = <0>;
>          };

You can't really use the "reg" property to refer to syscon
registers, but you can make up your own property for that,
or put the register numbers into the syscon1/2 properties,
or just hardcode the offsets in the driver.

> And correct reset-controller code to get regmap by phandle,
> then access registers by regmap.
> 
> Also I'll post two separate patches that add syscon nodes in question.

Sounds good, thanks!

	Arnd
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