linux-kernel - Re: [PATCH v2] MediaTek PMIC support

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Message-ID: <20150129142740.GH12209@pengutronix.de>
Date:	Thu, 29 Jan 2015 15:27:40 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Matthias Brugger <matthias.bgg@...il.com>
Cc:	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	YH Chen (陳昱豪) <yh.chen@...iatek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Henry Chen <henryc.chen@...iatek.com>,
	Rob Herring <robh+dt@...nel.org>,
	Yingjoe Chen (陳英洲) 
	<Yingjoe.Chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Lee Jones <lee.jones@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	James Liao <jamesjj.liao@...iatek.com>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v2] MediaTek PMIC support

On Thu, Jan 29, 2015 at 01:39:42PM +0100, Matthias Brugger wrote:
> Hi Sascha,
> 
> 2015-01-26 12:47 GMT+01:00 Sascha Hauer <s.hauer@...gutronix.de>:
> > Olof, Arnd,
> >
> > OK to put the driver into drivers/soc/mediatek? Can you take these
> > patches?
> 
> How does this patches fit together with the one James clock framework patches?
> Both use the same compatible "mediatek,mt8135-infracfg" and
> "mediatek,mt8135-pericfg".
> 
> I had a look on other implementations and they attach the reset
> controller to the clk driver, if they share the same hw block.
> Might we run into problems if we implement the clocks in the mfd, as
> we need the clocks early in boot (e.g. for the timer)?

>From my experience the clocks are needed by the timer before any driver
initializes.

> 
> In mt6589 pericfg apart from the clocks and reset controller provides
> registers for AXI bus control and USB wakeup and USB clock selection.
> The infracfg block provides top AXI bus fabric control signals and
> remap registers for the modem.
> Mike, Stephen, what do you think. Can we implement the clk in a mfd
> driver? Or do you prefer to implement the whole block in the clk
> driver?

Currently the clk support uses regular CLK_OF_DECLARE which handles the
clock part of pericfg/infracfg and then later a regular driver for
pericfg/infracfg comes and handles the rest of the functionality. Since
both use separate registers in the device register space it should work
fine.

Sascha

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