linux-kernel - [PATCH RFC v2 00/12] soc: samsung: Modify and enhance power domain driver

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Message-id: <1416833572-6880-1-git-send-email-amit.daniel@samsung.com>
Date:	Mon, 24 Nov 2014 18:22:40 +0530
From:	Amit Daniel Kachhap <amit.daniel@...sung.com>
To:	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org
Cc:	kgene.kim@...sung.com, linux-kernel@...r.kernel.org,
	s.nawrocki@...sung.com, pankaj.dubey@...sung.com,
	ulf.hansson@...aro.org, khilman@...nel.org,
	linux-pm@...r.kernel.org, geert@...ux-m68k.org, rjw@...ysocki.net,
	devicetree@...r.kernel.org,
	Amit Daniel Kachhap <amit.daniel@...sung.com>
Subject: [PATCH RFC v2 00/12] soc: samsung: Modify and enhance power domain
 driver

Posting this series as RFC to get more clarity as lot of power domain related
discussion is happening in mailing lists.

This patch series[1 - 12] performs several implementations as listed below,

1) Converts power domain driver to platform driver.
2) Registers this driver as MFD client driver.
3) Moves them into driver/soc/samsung folder.
4) Add parent power domain parsing code.
5) Updates the reparenting feature to make it more generic.
6) A feature to turn clocks on during pm domain off/on. There can be
   different set of clocks to be turned on. The patches in Rafael's tree allows
   a single list only.
7) Code added to preserve the clocks rates during power domain on/off
   sequence.
8) Restructured the exynos PD on/off handlers and added exynos7 support.

The power domain DT node may look something like,

mfc_pd: power-domain@...44060 {
	compatible = "samsung,exynos4210-pd", "samsung,exynos7-pd-mfc";
	reg = <0x10044060 0x20>;
	pd-parent-clock-names = "tclk0", "pclk0", "clk0";
	pd-parent-clocks = <&clock CLK_FIN_PLL>, <&clock CLK_MOUT_SW_ACLK333>,
		<&clock CLK_MOUT_USER_ACLK333>;
	pd-on-en-clock-names = "clk0", "clk1";
	pd-on-en-clocks = <&clock CLK_IP1>, <&clock CLK_IP2>,
	pd-off-en-clock-names = "clk0", "clk1", "clk3";
	pd-off-en-clocks = <&clock CLK_IP1>, <&clock CLK_IP2>, <&clock CLK_IP3>;
	pd-rate-clock-names = "clk0", "clk1";
	pd-rate-clocks = <&clock CLK_IP1>, <&clock CLK_IP2>,
	parents = <&pd_top>;
	#power-domain-cells = <0>;
};

Changes from v1:
* Removed PM domain notifier features.
* Removed clock save/restore through those notifiers.
* link for v1 is http://www.spinics.net/lists/linux-samsung-soc/msg38442.html.

This patch series depends on exynos pmu patches posted earlier.
http://lkml.org/lkml/2014/11/23/221

Amit Daniel Kachhap (12):
  arm: exynos: Add platform driver support for power domain driver
  soc: exynos: Move exynos power domain file to driver/soc/samsung
    folder
  soc: samsung: exynos-pmu: Register exynos pd driver as a mfd client
  soc: samsung: Re-structure PMU driver to create pd on/off handlers
  soc: samsung: pm_domain: Use unique compatible name for power domain
  driver: soc: exynos-pmu: Add exynos7 power domain on/off ops
  PM / Domains: export pm_genpd_lookup_name
  soc: samsung: pm_domain: Add support for parent power domain
  drivers: soc: pm_domain: Modify the parent clocks bindings
  drivers: soc: samsung: Add support for clock enabling in power domain
  drivers: soc: samsung: Add support for clock rate save/restore in
    power domain
  arm64: Kconfig: Enable PM_GENERIC_DOMAINS for exynos7

 .../bindings/arm/exynos/power_domain.txt           |   45 +-
 arch/arm/mach-exynos/Makefile                      |    1 -
 arch/arm/mach-exynos/pm_domains.c                  |  166 -------
 arch/arm64/Kconfig                                 |    1 +
 drivers/base/power/domain.c                        |    3 +-
 drivers/soc/samsung/Kconfig                        |    9 +
 drivers/soc/samsung/Makefile                       |    3 +-
 drivers/soc/samsung/exynos-pmu.c                   |  185 +++++++
 drivers/soc/samsung/pm_domains.c                   |  510 ++++++++++++++++++++
 include/linux/pm_domain.h                          |    7 +
 include/linux/soc/samsung/exynos-pmu.h             |   15 +
 include/linux/soc/samsung/exynos-regs-pmu.h        |   26 +
 12 files changed, 794 insertions(+), 177 deletions(-)
 delete mode 100644 arch/arm/mach-exynos/pm_domains.c
 create mode 100644 drivers/soc/samsung/pm_domains.c

-- 
1.7.9.5

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