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[2/3] Bluetooth: hci_ll: Add support for the external clock

Message ID 1496826502-1339-3-git-send-email-ulf.hansson@linaro.org
State New
Headers show
Series arm64: hi6220-hikey: Fix Bluetooth support | expand

Commit Message

Ulf Hansson June 7, 2017, 9:08 a.m. UTC 
Add support to manage the external clock provided to the WiLink combo chip
as it's needed for any of the transport interfaces.

To avoid breaking platforms not yet specifying the external clock, we make
it optional. In case the clock is successfully fetched during ->probe(),
let's manage it via the ->open|close() callbacks, to make sure the device
get properly powered on/off.

Fixes: ea452678734e ("arm64: dts: hikey: Fix WiFi support")
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

---
 drivers/bluetooth/hci_ll.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

-- 
2.7.4
diff mbox series

Patch

diff --git a/drivers/bluetooth/hci_ll.c b/drivers/bluetooth/hci_ll.c
index adc444f..68f3d16 100644
--- a/drivers/bluetooth/hci_ll.c
+++ b/drivers/bluetooth/hci_ll.c
@@ -48,6 +48,7 @@ 
 #include <linux/serdev.h>
 #include <linux/skbuff.h>
 #include <linux/ti_wilink_st.h>
+#include <linux/clk.h>
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
@@ -84,6 +85,7 @@  struct ll_device {
 	struct hci_uart hu;
 	struct serdev_device *serdev;
 	struct gpio_desc *enable_gpio;
+	struct clk *ext_clk;
 };
 
 struct ll_struct {
@@ -146,8 +148,12 @@  static int ll_open(struct hci_uart *hu)
 
 	hu->priv = ll;
 
-	if (hu->serdev)
+	if (hu->serdev) {
+		struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
 		serdev_device_open(hu->serdev);
+		if (!IS_ERR(lldev->ext_clk))
+			clk_prepare_enable(lldev->ext_clk);
+	}
 
 	return 0;
 }
@@ -181,6 +187,8 @@  static int ll_close(struct hci_uart *hu)
 		struct ll_device *lldev = serdev_device_get_drvdata(hu->serdev);
 		gpiod_set_value_cansleep(lldev->enable_gpio, 0);
 
+		clk_disable_unprepare(lldev->ext_clk);
+
 		serdev_device_close(hu->serdev);
 	}
 
@@ -720,6 +728,10 @@  static int hci_ti_probe(struct serdev_device *serdev)
 	if (IS_ERR(lldev->enable_gpio))
 		return PTR_ERR(lldev->enable_gpio);
 
+	lldev->ext_clk = devm_clk_get(&serdev->dev, "ext_clock");
+	if (IS_ERR(lldev->ext_clk) && PTR_ERR(lldev->ext_clk) != -ENOENT)
+		return PTR_ERR(lldev->ext_clk);
+
 	of_property_read_u32(serdev->dev.of_node, "max-speed", &max_speed);
 	hci_uart_set_speeds(hu, 115200, max_speed);