Some boards don't need the 4.2V power source at all, so allow them to
keep it disabled for efficiency reasons.
For backwards compatibility, don't disable the 4P2 power source on the
existing boards which are supplied from battery input.
The POWER_USE_5V code path however always enables it up as it is needed
to supply the DC-DC converter.
Signed-off-by: Roland Hieber <r.hieber@xxxxxxxxxxxxxx>
---
arch/arm/boards/freescale-mx28-evk/lowlevel.c | 2 +-
arch/arm/boards/karo-tx28/lowlevel.c | 2 +-
arch/arm/mach-mxs/include/mach/init.h | 2 ++
arch/arm/mach-mxs/power-init.c | 3 ++-
4 files changed, 6 insertions(+), 3 deletions(-)
diff --git a/arch/arm/boards/freescale-mx28-evk/lowlevel.c b/arch/arm/boards/freescale-mx28-evk/lowlevel.c
index b6a8793c9e..fdaef959a3 100644
--- a/arch/arm/boards/freescale-mx28-evk/lowlevel.c
+++ b/arch/arm/boards/freescale-mx28-evk/lowlevel.c
@@ -43,7 +43,7 @@ static noinline void freescale_mx28evk_init(void)
pr_debug("initializing power...\n");
- mx28_power_init(POWER_USE_BATTERY_INPUT);
+ mx28_power_init(POWER_USE_BATTERY_INPUT | POWER_ENABLE_4P2);
pr_debug("initializing SDRAM...\n");
diff --git a/arch/arm/boards/karo-tx28/lowlevel.c b/arch/arm/boards/karo-tx28/lowlevel.c
index 5a6a3e3519..a9b65167cd 100644
--- a/arch/arm/boards/karo-tx28/lowlevel.c
+++ b/arch/arm/boards/karo-tx28/lowlevel.c
@@ -43,7 +43,7 @@ static noinline void karo_tx28_init(void)
pr_debug("initializing power...\n");
- mx28_power_init(POWER_USE_BATTERY_INPUT);
+ mx28_power_init(POWER_USE_BATTERY_INPUT | POWER_ENABLE_4P2);
pr_debug("initializing SDRAM...\n");
diff --git a/arch/arm/mach-mxs/include/mach/init.h b/arch/arm/mach-mxs/include/mach/init.h
index 878cf4ad62..aa3c68facb 100644
--- a/arch/arm/mach-mxs/include/mach/init.h
+++ b/arch/arm/mach-mxs/include/mach/init.h
@@ -18,11 +18,13 @@ void mxs_early_delay(int delay);
* - POWER_USE_BATTERY: use battery input when the system is supplied by a battery
* - POWER_USE_BATTERY_INPUT: use battery input when the system is supplied by
* a DC source (instead of a real battery) on the battery input
+ * - POWER_ENABLE_4P2: power up the 4P2 regulator (implied for POWER_USE_5V)
*/
enum mxs_power_config {
POWER_USE_5V = 0b00000000,
POWER_USE_BATTERY = 0b00000001,
POWER_USE_BATTERY_INPUT = 0b00000010,
+ POWER_ENABLE_4P2 = 0b00000100,
};
extern int power_config;
static inline enum mxs_power_config mxs_power_config_get_use(void) {
diff --git a/arch/arm/mach-mxs/power-init.c b/arch/arm/mach-mxs/power-init.c
index 14f9b7cca7..60fa0cb022 100644
--- a/arch/arm/mach-mxs/power-init.c
+++ b/arch/arm/mach-mxs/power-init.c
@@ -717,7 +717,8 @@ static void mxs_enable_battery_input(void)
POWER_5VCTRL_CHARGE_4P2_ILIMIT_MASK,
0x8 << POWER_5VCTRL_CHARGE_4P2_ILIMIT_OFFSET);
- mxs_power_enable_4p2();
+ if (power_config & POWER_ENABLE_4P2)
+ mxs_power_enable_4p2();
}
/**
--
2.18.0
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