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clk: shmobile: Add CPG/MSTP Clock Domain support

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Add Clock Domain support to the Clock Pulse Generator (CPG) Module Stop
(MSTP) Clocks driver using the generic PM Domain.  This allows to
power-manage the module clocks of SoC devices that are part of the
CPG/MSTP Clock Domain using Runtime PM, or for system suspend/resume.

SoC devices that are part of the CPG/MSTP Clock Domain and can be
power-managed through an MSTP clock should be tagged in DT with a
proper "power-domains" property.

The CPG/MSTP Clock Domain code will scan such devices for clocks that
are suitable for power-managing the device, by looking for a clock that
is compatible with "renesas,cpg-mstp-clocks".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Geert Uytterhoeven
2015-08-04 14:28:02 +02:00
committed by Simon Horman
parent d770e558e2
commit 752b5ed5f6
2 changed files with 99 additions and 0 deletions
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12
include/linux/clk/shmobile.h
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@@ -16,8 +16,20 @@
#include <linux/types.h>
struct device;
struct device_node;
struct generic_pm_domain;
void r8a7778_clocks_init(u32 mode);
void r8a7779_clocks_init(u32 mode);
void rcar_gen2_clocks_init(u32 mode);
#ifdef CONFIG_PM_GENERIC_DOMAINS_OF
void cpg_mstp_add_clk_domain(struct device_node *np);
int cpg_mstp_attach_dev(struct generic_pm_domain *domain, struct device *dev);
void cpg_mstp_detach_dev(struct generic_pm_domain *domain, struct device *dev);
#else
static inline void cpg_mstp_add_clk_domain(struct device_node *np) {}
#endif
#endif