netdev - [PATCH 2/8] Bluetooth: hci_h5: Add support for reset GPIO

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Date:   Fri, 18 Jan 2019 09:02:26 -0800
From:   Vasily Khoruzhick <anarsoul@...il.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Vasily Khoruzhick <anarsoul@...il.com>, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-bluetooth@...r.kernel.org
Subject: [PATCH 2/8] Bluetooth: hci_h5: Add support for reset GPIO

Some boards (e.g. Pine64 and Pinebook) wire a GPIO to reset pin of
RTL8723BS

Signed-off-by: Vasily Khoruzhick <anarsoul@...il.com>
---
 drivers/bluetooth/hci_h5.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index 069d1c8fde73..7ead8c3d8657 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -107,6 +107,7 @@ struct h5 {
 	const struct h5_vnd *vnd;
 	const char *id;
 
+	struct gpio_desc *reset_gpio;
 	struct gpio_desc *enable_gpio;
 	struct gpio_desc *device_wake_gpio;
 };
@@ -833,6 +834,10 @@ static int h5_serdev_probe(struct serdev_device *serdev)
 	if (IS_ERR(h5->device_wake_gpio))
 		return PTR_ERR(h5->device_wake_gpio);
 
+	h5->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(h5->reset_gpio))
+		return PTR_ERR(h5->reset_gpio);
+
 	return hci_uart_register_device(&h5->serdev_hu, &h5p);
 }
 
@@ -921,6 +926,9 @@ static void h5_btrtl_open(struct h5 *h5)
 
 	/* The controller needs up to 500ms to wakeup */
 	gpiod_set_value_cansleep(h5->enable_gpio, 1);
+	/* Take it out of reset */
+	gpiod_set_value_cansleep(h5->reset_gpio, 0);
+	msleep(100);
 	gpiod_set_value_cansleep(h5->device_wake_gpio, 1);
 	msleep(500);
 }
@@ -928,6 +936,7 @@ static void h5_btrtl_open(struct h5 *h5)
 static void h5_btrtl_close(struct h5 *h5)
 {
 	gpiod_set_value_cansleep(h5->device_wake_gpio, 0);
+	gpiod_set_value_cansleep(h5->reset_gpio, 1);
 	gpiod_set_value_cansleep(h5->enable_gpio, 0);
 }
 
-- 
2.20.1