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. Cc: Peter De Schrijver <[email protected]> Cc: Samuel Ortiz <[email protected]> Cc: Lee Jones <[email protected]> Signed-off-by: Tony Lindgren <[email protected]> --- .../devicetree/bindings/mfd/twl4030-power.txt | 6 ++++++ drivers/mfd/twl4030-power.c | 19 +++++++++++++++++++ 2 files changed, 25 insertions(+) diff --git a/Documentation/devicetree/bindings/mfd/twl4030-power.txt b/Documentation/devicetree/bindings/mfd/twl4030-power.txt index bbd6603..b9ee7b9 100644 --- a/Documentation/devicetree/bindings/mfd/twl4030-power.txt +++ b/Documentation/devicetree/bindings/mfd/twl4030-power.txt @@ -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. diff --git a/drivers/mfd/twl4030-power.c b/drivers/mfd/twl4030-power.c index 89c6b1a..12e4abe 100644 --- a/drivers/mfd/twl4030-power.c +++ b/drivers/mfd/twl4030-power.c @@ -777,6 +777,21 @@ 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[] = { + { .resource = RES_CLKEN, .devgroup = DEV_GRP_P1 | DEV_GRP_P3, + .type = 3, .type2 = 2, .remap_off = TWL_REMAP_OFF, + .remap_sleep = TWL_REMAP_SLEEP, }, + { /* 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", @@ -786,6 +801,10 @@ 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); -- 1.8.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
