linux-kernel - [PATCH 8/9] ARM: dts: ux500: samsung-golden: Add Bluetooth

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Date:   Thu, 19 Dec 2019 21:20:51 +0100
From:   Stephan Gerhold <stephan@...hold.net>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephan Gerhold <stephan@...hold.net>
Subject: [PATCH 8/9] ARM: dts: ux500: samsung-golden: Add Bluetooth

samsung-golden uses a BCM4334 WiFi+BT combo chip.
The BT part is connected via UART and supported by the hci_bcm
driver in mainline.
Add the necessary device tree changes to make it load correctly.

It requires (seemingly) device-specific firmware that can be
extracted from the stock Android system used on samsung-golden:
  - /system/bin/bcm4334.hcd -> /lib/firmware/brcm/BCM4334B0.hcd

On my device, scanning for other Bluetooth devices works just fine,
but for some reason it keeps disconnecting immediately
when attempting to connect to an other device.

Signed-off-by: Stephan Gerhold <stephan@...hold.net>
---
 .../arm/boot/dts/ste-ux500-samsung-golden.dts | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/arch/arm/boot/dts/ste-ux500-samsung-golden.dts b/arch/arm/boot/dts/ste-ux500-samsung-golden.dts
index d22b2879c46a..313f0ab16866 100644
--- a/arch/arm/boot/dts/ste-ux500-samsung-golden.dts
+++ b/arch/arm/boot/dts/ste-ux500-samsung-golden.dts
@@ -113,6 +113,19 @@ uart@...20000 {
 			pinctrl-names = "default", "sleep";
 			pinctrl-0 = <&u0_a_1_default>;
 			pinctrl-1 = <&u0_a_1_sleep>;
+
+			bluetooth {
+				compatible = "brcm,bcm4330-bt";
+				/* GPIO222 (BT_VREG_ON) */
+				shutdown-gpios = <&gpio6 30 GPIO_ACTIVE_HIGH>;
+				/* GPIO199 (BT_WAKE) */
+				device-wakeup-gpios = <&gpio6 7 GPIO_ACTIVE_HIGH>;
+				/* GPIO97 (BT_HOST_WAKE) */
+				host-wakeup-gpios = <&gpio3 1 GPIO_ACTIVE_HIGH>;
+
+				pinctrl-names = "default";
+				pinctrl-0 = <&bluetooth_default>;
+			};
 		};
 
 		/* GPF UART */
@@ -396,6 +409,20 @@ golden_cfg1 {
 		};
 	};
 
+	bluetooth {
+		bluetooth_default: bluetooth_default {
+			golden_cfg1 {
+				pins = "GPIO199_AH23",	/* BT_WAKE */
+				       "GPIO222_AJ9";	/* BT_VREG_ON */
+				ste,config = <&gpio_out_lo>;
+			};
+			golden_cfg2 {
+				pins = "GPIO97_D9";	/* BT_HOST_WAKE */
+				ste,config = <&gpio_in_nopull>;
+			};
+		};
+	};
+
 	vibrator {
 		vibrator_default: vibrator_default {
 			golden_cfg1 {
-- 
2.24.1