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authorKevin Hilman <khilman@ti.com>2012-09-07 01:03:08 +0400
committerKevin Hilman <khilman@ti.com>2012-10-09 01:59:04 +0400
commit24d7b40a60cf19008334bcbcbd98da374d4d9c64 (patch)
tree4f2252f030dbfd9976026945af70f87c7c217196 /arch/arm/mach-omap2/pm.c
parent747a7f64201b8ffa8654c8767c5f794fdfa4239e (diff)
downloadlinux-24d7b40a60cf19008334bcbcbd98da374d4d9c64.tar.xz
ARM: OMAP2+: PM: MPU DVFS: use generic CPU device for MPU-SS
Currently, a dummy omap_device is created for the MPU sub-system so that a device node exists for MPU DVFS. Specifically, for the association of MPU OPPs to a device node, and so that a voltage regulator can be mapped to a device node. For drivers to get a handle to this device node, an OMAP-specific API has been used. However, the kernel already has device nodes for the CPU(s) in the system, so we can use those instead of an OMAP-specific dummy device and then drivers (like OMAP CPUfreq) can use generic APIs. To use the existing CPU device nodes, modify the OPP creation and regulator registration to use the CPU0 device node for registraion. NOTE: this patch always uses CPU0 as the device node. On all OMAPs today, MPU DVFS scales all CPUs together, so this will not be a problem, but this assumption will need to be changed if independently scalable CPUs are introduced. Cc: Paul Walmsley <paul@pwsan.com> Signed-off-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'arch/arm/mach-omap2/pm.c')
-rw-r--r--arch/arm/mach-omap2/pm.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c
index 939bd6f70b51..173c2be14d5d 100644
--- a/arch/arm/mach-omap2/pm.c
+++ b/arch/arm/mach-omap2/pm.c
@@ -16,6 +16,7 @@
#include <linux/opp.h>
#include <linux/export.h>
#include <linux/suspend.h>
+#include <linux/cpu.h>
#include <asm/system_misc.h>
@@ -168,7 +169,15 @@ static int __init omap2_set_init_voltage(char *vdd_name, char *clk_name,
goto exit;
}
- dev = omap_device_get_by_hwmod_name(oh_name);
+ if (!strncmp(oh_name, "mpu", 3))
+ /*
+ * All current OMAPs share voltage rail and clock
+ * source, so CPU0 is used to represent the MPU-SS.
+ */
+ dev = get_cpu_device(0);
+ else
+ dev = omap_device_get_by_hwmod_name(oh_name);
+
if (IS_ERR(dev)) {
pr_err("%s: Unable to get dev pointer for hwmod %s\n",
__func__, oh_name);