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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: Tony Lindgren <tony@atomide.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
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@ -9,6 +9,7 @@ Required properties:
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"ti,twl4030-power"
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"ti,twl4030-power-reset"
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"ti,twl4030-power-idle"
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"ti,twl4030-power-idle-osc-off"
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The use of ti,twl4030-power-reset is recommended at least on
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3530 that needs a special configuration for warm reset to work.
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@ -16,6 +17,11 @@ The use of ti,twl4030-power-reset is recommended at least on
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When using ti,twl4030-power-idle, the TI recommended configuration
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for idle modes is loaded to the tlw4030 PMIC.
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When using ti,twl4030-power-idle-osc-off, the TI recommended
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configuration is used with the external oscillator being shut
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down during off-idle. Note that this does not work on all boards
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depending on how the external oscillator is wired.
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Optional properties:
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- ti,use_poweroff: With this flag, the chip will initiates an ACTIVE-to-OFF or
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SLEEP-to-OFF transition when the system poweroffs.
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@ -761,6 +761,19 @@ static struct twl4030_power_data omap3_idle = {
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.resource_config = omap3_idle_rconfig,
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};
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/* Disable 32 KiHz oscillator during idle */
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static struct twl4030_resconfig osc_off_rconfig[] = {
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TWL_REMAP_OFF(RES_CLKEN, DEV_GRP_P1 | DEV_GRP_P3, 3, 2),
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{ /* Terminator */ },
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};
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static struct twl4030_power_data osc_off_idle = {
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.scripts = omap3_idle_scripts,
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.num = ARRAY_SIZE(omap3_idle_scripts),
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.resource_config = omap3_idle_rconfig,
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.board_config = osc_off_rconfig,
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};
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static struct of_device_id twl4030_power_of_match[] = {
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{
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.compatible = "ti,twl4030-power-reset",
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@ -770,6 +783,10 @@ static struct of_device_id twl4030_power_of_match[] = {
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.compatible = "ti,twl4030-power-idle",
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.data = &omap3_idle,
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},
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{
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.compatible = "ti,twl4030-power-idle-osc-off",
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.data = &osc_off_idle,
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},
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{ },
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};
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MODULE_DEVICE_TABLE(of, twl4030_power_of_match);
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