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authorTony Lindgren <tony@atomide.com>2014-05-05 17:27:38 -0700
committerTony Lindgren <tony@atomide.com>2014-05-06 15:45:15 -0700
commitc1be2032f66df9e1238bd5bc4ca666de88a62abc (patch)
tree435f663e06f1c9dbbcc113ecfa4273d2616e4c82 /arch/arm/boot/dts/omap3-n900.dts
parent2ee5f528a8102269ba1c0562799d30dd0075d57a (diff)
downloadlinux-c1be2032f66df9e1238bd5bc4ca666de88a62abc.tar.bz2
ARM: dts: Enable N900 keyboard sleep leds by default
On N900 there are nice LEDs that show the state of the sys_clkreq and sys_off_mode pins. These LEDs go low when the system enters deeper idle states. The left LED shows the state of the sys_clkreq pin, and goes off during retention idle. The right LED shows the state of sys_off_mode pin and both go off during off idle. As N900 is a battery operated device, these LEDs should be off most of the time. So let's enable them by default so we can make sure the system is mostly idle. This allows the maintainers to also immediately test patches for PM regressions by looking at the LEDs, which certainly makes my life easier. The LED can naturally be disabled during runtime with: # echo none > /sys/class/leds/debug::sleep/trigger Note that we don't currently have support for omap3 errata 1.158 that remuxes GPIO pins to INPUT_PULLUP | MUX_MODE7 for the duration of idle. This means that the GPIO pins set high will go down during off idle. In this case it does not matter as the sys_off_mode goes down too, but there's still a slim chance of false off idle LED signals. If in doubt, false LED signals can be verified by the sys_off_mode or vdd_core values. Also note that to allow the UARTs to autoidle, the following needs to be run on N900 to enable off idle: #!/bin/sh uarts=$(find /sys/class/tty/ttyO*/device/power/ -type d) for uart in $uarts; do echo 3000 > $uart/autosuspend_delay_ms done uarts=$(find /sys/class/tty/ttyO*/power/ -type d) for uart in $uarts; do echo enabled > $uart/wakeup echo auto > $uart/control done echo 1 > /sys/kernel/debug/pm_debug/enable_off_mode For retention idle, change the above to set 0 to enable_off_mode. Also note that without the twl4030 PM scripts the actual voltage scaling won't happen for off idle so we only get voltage scaling over I2C4 for retention idle. I'll do some device tree patches for those also a bit later on. Cc: Kevin Hilman <khilman@linaro.org> Cc: Nishanth Menon <nm@ti.com> Cc: Pali Rohár <pali.rohar@gmail.com> Cc: Paul Walmsley <paul@pwsan.com> Cc: Pavel Machek <pavel@ucw.cz> Cc: Sebastian Reichel <sre@kernel.org> Cc: Tero Kristo <t-kristo@ti.com> Acked-by: Aaro Koskinen <aaro.koskinen@iki.fi> [tony@atomide.com: also make sure the LEDs get built to see PM regressions] Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/boot/dts/omap3-n900.dts')
-rw-r--r--arch/arm/boot/dts/omap3-n900.dts17
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index 656ae403018f..150ca097c02d 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -21,6 +21,17 @@
};
};
+ leds {
+ compatible = "gpio-leds";
+ heartbeat {
+ label = "debug::sleep";
+ gpios = <&gpio6 2 GPIO_ACTIVE_HIGH>; /* gpio162 */
+ linux,default-trigger = "default-on";
+ pinctrl-names = "default";
+ pinctrl-0 = <&debug_leds>;
+ };
+ };
+
memory {
device_type = "memory";
reg = <0x80000000 0x10000000>; /* 256 MB */
@@ -130,6 +141,12 @@
>;
};
+ debug_leds: pinmux_debug_led_pins {
+ pinctrl-single,pins = <
+ OMAP3_CORE1_IOPAD(0x2198, PIN_OUTPUT | MUX_MODE4) /* mcbsp1_clkx.gpio_162 */
+ >;
+ };
+
mmc1_pins: pinmux_mmc1_pins {
pinctrl-single,pins = <
0x114 (PIN_INPUT_PULLUP | MUX_MODE0) /* sdmmc1_clk */