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Commit 43fef47f authored by Tony Lindgren's avatar Tony Lindgren Committed by Lee Jones
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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: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
parent 482e7db1

Documentation/devicetree/bindings/mfd/twl4030-power.txt

+6 −0
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ Required properties: 
	"ti,twl4030-power"

	"ti,twl4030-power-reset"

	"ti,twl4030-power-idle"

	"ti,twl4030-power-idle-osc-off"



The use of ti,twl4030-power-reset is recommended at least on

3530 that needs a special configuration for warm reset to work.
@@ -16,6 +17,11 @@ The use of ti,twl4030-power-reset is recommended at least on 
When using ti,twl4030-power-idle, the TI recommended configuration

for idle modes is loaded to the tlw4030 PMIC.



When using ti,twl4030-power-idle-osc-off, the TI recommended

configuration is used with the external oscillator being shut

down during off-idle. Note that this does not work on all boards

depending on how the external oscillator is wired.



Optional properties:

- ti,use_poweroff: With this flag, the chip will initiates an ACTIVE-to-OFF or

		   SLEEP-to-OFF transition when the system poweroffs.

drivers/mfd/twl4030-power.c

+17 −0
Original line number Diff line number Diff line
@@ -761,6 +761,19 @@ static struct twl4030_power_data omap3_idle = { 
	.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 @@ static struct of_device_id twl4030_power_of_match[] = { 
		.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);