[PATCH] ARM: dts: rockchip: Configure BT_DEV_WAKE in on rk3288-veyron

Douglas Anderson
2019-06-19T18:34:25Z

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>
---

.../boot/dts/rk3288-veyron-chromebook.dtsi | 2 ++
arch/arm/boot/dts/rk3288-veyron.dtsi | 20 +++++++++++++++++++
2 files changed, 22 insertions(+)

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 {
--
2.22.0.410.gd8fdbe21b5-goog