linux-kernel - Re: [RFC PATCH] clk: add extension API

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Message-ID: <20120531094301.GT8026@tbergstrom-lnx.Nvidia.com>
Date:	Thu, 31 May 2012 12:43:01 +0300
From:	Peter De Schrijver <pdeschrijver@...dia.com>
To:	Felipe Balbi <balbi@...com>
CC:	Stephen Boyd <sboyd@...eaurora.org>,
	Russell King <linux@....linux.org.uk>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Mike Turquette <mturquette@...com>
Subject: Re: [RFC PATCH] clk: add extension API

> > > on Tegra:
> > > 
> > > device_reset(dev)
> > > 	-> dev_pm_domain->reset()
> > > 		-> tegra_periph_reset()
> > > 
> > 
> > These methods are also needed internally by the powergating code.
> 
> so ? Just call them when you need...
> 

the powergating code calls assert and deassert indepedently
ie:

tegra_periph_reset_assert()

do stuff

tegra_periph_reset_assert()

> > > on OMAP:
> > > 
> > > device_reset(dev)
> > > 	-> dev_pm_domain->reset()
> > > 		-> omap_hwmod_reset()
> > > 
> > > 
> > > btw:
> > > 
> > > tegra_periph_reset(....)
> > > {
> > > 	tegra_periph_reset_assert(...);
> > > 	udelay(2);
> > > 	tegra_periph_reset_deassert(...);
> > > }
> > 
> > which uses the clockframework currently.
> 
> no problems there. The point is that you already know which clock feed
> into which device, so if you have a device-based API for device
> soft-reset, you can figure out which exact clock to toggle, right ?

you have the struct clk, you could dive into that and grab clk_hw and call
some function directly. But sounds quite horrible to me.

Cheers,

Peter.
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