ARM: dts: rockchip: Configure BT_DEV_WAKE in on rk3288-veyron

This is the other half of the hacky solution from commit f497ab6b4bb8
("ARM: dts: rockchip: Configure BT_HOST_WAKE as wake-up signal on
veyron").  Specifically the LPM driver that the Broadcom Bluetooth
expects to have (but is missing in mainline) has two halves of the
equation: BT_HOST_WAKE and BT_DEV_WAKE.  The BT_HOST_WAKE (which was
handled in the previous commit) is the one that lets the Bluetooth
wake the system up.  The BT_DEV_WAKE (this patch) tells the Bluetooth
that it's OK to go into a low power mode.  That means we were burning
a bit of extra power in S3 without this patch.  Measurements are a bit
noisy, but it appears to be a few mA worth of difference.

NOTE: Though these pins don't do much on systems with Marvell
Bluetooth, downstream kernels set it on all veyron boards so we'll do
the same.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

2 files changed, 22 insertions, 0 deletions

diff --git a/arch/arm/boot/dts/rk3288-veyron-chromebook.dtsi b/arch/arm/boot/dts/rk3288-veyron-chromebook.dtsi
index 5727017f34b2..1cadb522fd0d 100644
--- a/arch/arm/boot/dts/rk3288-veyron-chromebook.dtsi
+++ b/arch/arm/boot/dts/rk3288-veyron-chromebook.dtsi
@@ -237,6 +237,7 @@
 
                 /* Wake only */
                 &suspend_l_wake
+                &bt_dev_wake_awake
         >;
         pinctrl-1 = <
                 /* Common for sleep and wake, but no owners */
@@ -246,6 +247,7 @@
 
                 /* Sleep only */
                 &suspend_l_sleep
+                &bt_dev_wake_sleep
         >;
 
         backlight {
diff --git a/arch/arm/boot/dts/rk3288-veyron.dtsi b/arch/arm/boot/dts/rk3288-veyron.dtsi
index e2635ad574e7..53d2f2452868 100644
--- a/arch/arm/boot/dts/rk3288-veyron.dtsi
+++ b/arch/arm/boot/dts/rk3288-veyron.dtsi
@@ -485,12 +485,18 @@
                 &ddr0_retention
                 &ddrio_pwroff
                 &global_pwroff
+
+                /* Wake only */
+                &bt_dev_wake_awake
         >;
         pinctrl-1 = <
                 /* Common for sleep and wake, but no owners */
                 &ddr0_retention
                 &ddrio_pwroff
                 &global_pwroff
+
+                /* Sleep only */
+                &bt_dev_wake_sleep
         >;
 
         pcfg_pull_none_drv_8ma: pcfg-pull-none-drv-8ma {
@@ -596,6 +602,20 @@
                 sdio0_clk: sdio0-clk {
                         rockchip,pins = <4 RK_PD1 1 &pcfg_pull_none_drv_8ma>;
                 };
+
+                /*
+                 * These pins are only present on very new veyron boards; on
+                 * older boards bt_dev_wake is simply always high.  Note that
+                 * gpio4_D2 is a NC on old veyron boards, so it doesn't hurt
+                 * to map this pin everywhere
+                 */
+                bt_dev_wake_sleep: bt-dev-wake-sleep {
+                        rockchip,pins = <4 RK_PD2 RK_FUNC_GPIO &pcfg_output_low>;
+                };
+
+                bt_dev_wake_awake: bt-dev-wake-awake {
+                        rockchip,pins = <4 RK_PD2 RK_FUNC_GPIO &pcfg_output_high>;
+                };
         };
 
         tpm {