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Bluetooth: hci_ll: Add support for the external clock

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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: ea45267873 ("arm64: dts: hikey: Fix WiFi support")
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Ulf Hansson 2017-06-07 11:08:21 +02:00 committed by Marcel Holtmann
parent 3c8e42a793
commit 43d3d092c7
1 changed files with 13 additions and 1 deletions
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14
drivers/bluetooth/hci_ll.c
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@ -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);