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linux-next/drivers/sh/pm_runtime.c
Geert Uytterhoeven cbc41d0a76 drivers: sh: Disable PM runtime for multi-platform ARM with genpd
If the default PM Domain using PM_CLK is used for PM runtime, the real
Clock Domain cannot be registered from DT later.

Hence do not enable it when running a multi-platform kernel with genpd
support on R-Car or RZ.  The CPG/MSTP Clock Domain driver will take care
of PM runtime management of the module clocks.

Now most multi-platform ARM shmobile platforms (SH-Mobile, R-Mobile,
R-Car, RZ) use DT-based PM Domains to take care of PM runtime management
of the module clocks, simplify the platform logic by replacing the
explicit SoC checks by a single check for the presence of MSTP clocks in
DT.

Backwards-compatiblity with old DTs (mainly for R-Car Gen2) is provided
by checking for the presence of a "#power-domain-cells" property in DT.

The default PM Domain is still needed for:
  - backwards-compatibility with old DTs that lack PM Domain properties,
  - the CONFIG_PM=n case,
  - legacy (non-DT) ARM/shmobile platforms without genpd support
    (r8a7778, r8a7779),
  - legacy SuperH.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
2015-09-14 10:20:23 +09:00

50 lines
1.2 KiB
C

/*
* Runtime PM support code
*
* Copyright (C) 2009-2010 Magnus Damm
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/pm_runtime.h>
#include <linux/pm_domain.h>
#include <linux/pm_clock.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/sh_clk.h>
#include <linux/bitmap.h>
#include <linux/slab.h>
static struct dev_pm_domain default_pm_domain = {
.ops = {
USE_PM_CLK_RUNTIME_OPS
USE_PLATFORM_PM_SLEEP_OPS
},
};
static struct pm_clk_notifier_block platform_bus_notifier = {
.pm_domain = &default_pm_domain,
.con_ids = { NULL, },
};
static int __init sh_pm_runtime_init(void)
{
if (IS_ENABLED(CONFIG_ARCH_SHMOBILE_MULTI)) {
if (!of_find_compatible_node(NULL, NULL,
"renesas,cpg-mstp-clocks"))
return 0;
if (IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS_OF) &&
of_find_node_with_property(NULL, "#power-domain-cells"))
return 0;
}
pm_clk_add_notifier(&platform_bus_type, &platform_bus_notifier);
return 0;
}
core_initcall(sh_pm_runtime_init);