Commit 43d3d092 authored by Ulf Hansson's avatar Ulf Hansson Committed by Marcel Holtmann
Browse files

Bluetooth: hci_ll: Add support for the external clock 



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: ea452678 ("arm64: dts: hikey: Fix WiFi support")
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Tested-by: default avatarJohn Stultz <john.stultz@linaro.org>
Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
parent 3c8e42a7

drivers/bluetooth/hci_ll.c

+13 −1
Original line number Diff line number Diff line
@@ -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);

	}
@@ -721,6 +729,10 @@ 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);

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