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

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Date:	Wed, 30 May 2012 13:28:52 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Mike Turquette <mturquette@...com>
CC:	Peter De Schrijver <pdeschrijver@...dia.com>,
	Russell King <linux@....linux.org.uk>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [RFC PATCH] clk: add extension API

On 05/30/12 12:40, Mike Turquette wrote:
> I also wonder if exposing some of these knobs should be done in the
> basic clock types.  Meaning that instead of having additional calls in
> the clk.h API those calls could be exposed by the basic clock types that
> map to the actions.

What do you mean by basic clock types that map to actions? Perhaps an
example?

>
> The question that needs to be answered is this: do generic drivers need
> access to these additional functions (clk.h) or just the platform code
> which implements some of the clock logic (basic clock types &
> platform-speciic clock types).

At least for tegra it looks like they need reset assertion and
deassertion in generic drivers.

$ git grep tegra_periph_reset_assert
arch/arm/mach-tegra/clock.c:void tegra_periph_reset_assert(struct clk *c)
arch/arm/mach-tegra/clock.c:EXPORT_SYMBOL(tegra_periph_reset_assert);
arch/arm/mach-tegra/include/mach/clk.h:void tegra_periph_reset_assert(struct clk *c);
arch/arm/mach-tegra/pcie.c:     tegra_periph_reset_assert(tegra_pcie.pcie_xclk);
arch/arm/mach-tegra/pcie.c:     tegra_periph_reset_assert(tegra_pcie.afi_clk);
arch/arm/mach-tegra/pcie.c:     tegra_periph_reset_assert(tegra_pcie.pex_clk);
arch/arm/mach-tegra/pcie.c:     tegra_periph_reset_assert(tegra_pcie.pcie_xclk);
arch/arm/mach-tegra/pcie.c:     tegra_periph_reset_assert(tegra_pcie.afi_clk);
arch/arm/mach-tegra/powergate.c:        tegra_periph_reset_assert(clk);
drivers/i2c/busses/i2c-tegra.c: tegra_periph_reset_assert(i2c_dev->clk);
drivers/input/keyboard/tegra-kbc.c:     tegra_periph_reset_assert(kbc->clk);
drivers/staging/nvec/nvec.c:    tegra_periph_reset_assert(nvec->i2c_clk);

-- 
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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