linux-kernel - Re: [PATCH 2/3] clk: x86: add support for Lynxpoint LPSS clocks

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Message-ID: <20130115031118.GC5701@opensource.wolfsonmicro.com>
Date:	Tue, 15 Jan 2013 12:11:19 +0900
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Len Brown <lenb@...nel.org>, "Rafael J. Wysocki" <rjw@...k.pl>,
	Mike Turquette <mturquette@...aro.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linus Walleij <linus.walleij@...aro.org>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 2/3] clk: x86: add support for Lynxpoint LPSS clocks

On Mon, Jan 14, 2013 at 04:46:27PM +0200, Mika Westerberg wrote:
> Intel Lynxpoint Low Power Subsystem hosts peripherals like UART, I2C and
> SPI controllers. For most of these there is a configuration register that
> allows software to enable and disable the functional clock. Disabling the
> clock while the peripheral is not used saves power.
> 
> In order to take advantage of this we add a new clock gate of type
> 'lpss_gate' that just re-uses the ordinary clk_gate but in addition is able
> to enumerate the base address register of the device using ACPI.
> 
> We then create a clock tree that models the Lynxpoint LPSS clocks using
> these gates and fixed clocks so that we can pass clock rate to the drivers
> as well.

Reviewed-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
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