linux-kernel - [PATCH v2 0/3] x86: enable common clk and add support for Lynxpoint clocks

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Message-Id: <1358516761-20981-1-git-send-email-mika.westerberg@linux.intel.com>
Date:	Fri, 18 Jan 2013 15:45:58 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	linux-kernel@...r.kernel.org
Cc:	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>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Heikki Krogerus <heikki.krogerus@...ux.intel.com>,
	Mika Westerberg <mika.westerberg@...ux.intel.com>,
	linux-acpi@...r.kernel.org
Subject: [PATCH v2 0/3] x86: enable common clk and add support for Lynxpoint clocks

This is second iteration of the series. First revision is available here:

	https://lkml.org/lkml/2013/1/14/213

Idea is to let the LPSS peripheral drivers to use common clk framework to
get clock rate or enable/disable the functional clock. The discussion
started in this thread:

	http://thread.gmane.org/gmane.linux.kernel/1417691

In summary, there is no point in adding a special case code to the drivers
in order to pass them a fixed clock rate, but instead x86 should just
enable common clk subsystem and take advantage of it.

We try to address that in this series. Instead of enabling the common clk
framework by default we place it under CONFIG_X86_INTEL_LPSS config option.
This option then selects what is necessary to support the LPSS peripheral
drivers.

We then create the Lynxpoint clock tree and populate it accordingly.

Changes to previous version:
	- add config option CONFIG_X86_INTEL_LPSS
	- pass flags to acpi_create_platform_device() instead of calling
	  function in drivers/acpi/scan.c
	- create the clock platform devices in drivers/acpi/acpi_platform.c

Please review.

Mika Westerberg (3):
  x86: add support for Intel Low Power Subsystem
  clk: x86: add support for Lynxpoint LPSS clocks
  ACPI / platform: create LPSS clocks if Lynxpoint devices are found
    during scan

 arch/x86/Kconfig             |   10 +++++
 drivers/acpi/acpi_platform.c |   25 ++++++++++-
 drivers/acpi/internal.h      |    6 ++-
 drivers/acpi/scan.c          |   22 +++++-----
 drivers/clk/Makefile         |    1 +
 drivers/clk/x86/Makefile     |    2 +
 drivers/clk/x86/clk-lpss.c   |   99 ++++++++++++++++++++++++++++++++++++++++++
 drivers/clk/x86/clk-lpss.h   |   36 +++++++++++++++
 drivers/clk/x86/clk-lpt.c    |   86 ++++++++++++++++++++++++++++++++++++
 9 files changed, 275 insertions(+), 12 deletions(-)
 create mode 100644 drivers/clk/x86/Makefile
 create mode 100644 drivers/clk/x86/clk-lpss.c
 create mode 100644 drivers/clk/x86/clk-lpss.h
 create mode 100644 drivers/clk/x86/clk-lpt.c

-- 
1.7.10.4

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