mfd: twl4030-power: Add a configuration to turn off oscillator during off-idle
Some oscillators can be turned off during off-idle saving few
a little bit power at the cost of the oscillator start up
latency.
If you board can do this, you can now enable it by using the
ti,twl4030-power-idle-osc-off compatible flag.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c
index 4846c7b..3bc969a 100644
--- a/drivers/mfd/twl4030-power.c
+++ b/drivers/mfd/twl4030-power.c
@@ -761,6 +761,19 @@
.resource_config = omap3_idle_rconfig,
};
+/* Disable 32 KiHz oscillator during idle */
+static struct twl4030_resconfig osc_off_rconfig[] = {
+ TWL_REMAP_OFF(RES_CLKEN, DEV_GRP_P1 | DEV_GRP_P3, 3, 2),
+ { /* Terminator */ },
+};
+
+static struct twl4030_power_data osc_off_idle = {
+ .scripts = omap3_idle_scripts,
+ .num = ARRAY_SIZE(omap3_idle_scripts),
+ .resource_config = omap3_idle_rconfig,
+ .board_config = osc_off_rconfig,
+};
+
static struct of_device_id twl4030_power_of_match[] = {
{
.compatible = "ti,twl4030-power-reset",
@@ -770,6 +783,10 @@
.compatible = "ti,twl4030-power-idle",
.data = &omap3_idle,
},
+ {
+ .compatible = "ti,twl4030-power-idle-osc-off",
+ .data = &osc_off_idle,
+ },
{ },
};
MODULE_DEVICE_TABLE(of, twl4030_power_of_match);