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Bluetooth: hci_bcm: Add support for regulator supplies

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The Broadcom Bluetooth chips have two power inputs, VBAT and VDDIO.
The former provides overall power for the chip, while the latter powers
the I/O pins and buffers.

Model these two as regulator supplies, and let the driver manage them
in the same way as it does the clock supply.

Tested-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Chen-Yu Tsai 2018-12-17 12:04:43 +08:00 committed by Marcel Holtmann
parent 90bc07cc59
commit 75d11676dc
1 changed files with 30 additions and 9 deletions
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39
drivers/bluetooth/hci_bcm.c
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@ -31,6 +31,7 @@
#include <linux/property.h>
#include <linux/platform_data/x86/apple.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/clk.h>
#include <linux/gpio/consumer.h>
#include <linux/tty.h>
@ -53,6 +54,8 @@
#define BCM_AUTOSUSPEND_DELAY 5000 /* default autosleep delay */
#define BCM_NUM_SUPPLIES 2
/**
* struct bcm_device - device driver resources
* @serdev_hu: HCI UART controller struct
@ -73,7 +76,8 @@
* @btpd: Apple ACPI method to drive BT_REG_ON pin low ("Bluetooth Power Down")
* @txco_clk: external reference frequency clock used by Bluetooth device
* @lpo_clk: external LPO clock used by Bluetooth device
* @clk_enabled: whether clocks are prepared and enabled
* @supplies: VBAT and VDDIO supplies used by Bluetooth device
* @res_enabled: whether clocks and supplies are prepared and enabled
* @init_speed: default baudrate of Bluetooth device;
* the host UART is initially set to this baudrate so that
* it can configure the Bluetooth device for @oper_speed
@ -105,7 +109,8 @@ struct bcm_device {
struct clk *txco_clk;
struct clk *lpo_clk;
bool clk_enabled;
struct regulator_bulk_data supplies[BCM_NUM_SUPPLIES];
bool res_enabled;
u32 init_speed;
u32 oper_speed;
@ -216,17 +221,21 @@ static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
{
int err;
if (powered && !dev->clk_enabled) {
if (powered && !dev->res_enabled) {
err = regulator_bulk_enable(BCM_NUM_SUPPLIES, dev->supplies);
if (err)
return err;
/* LPO clock needs to be 32.768 kHz */
err = clk_set_rate(dev->lpo_clk, 32768);
if (err) {
dev_err(dev->dev, "Could not set LPO clock rate\n");
return err;
goto err_regulator_disable;
}
err = clk_prepare_enable(dev->lpo_clk);
if (err)
return err;
goto err_regulator_disable;
err = clk_prepare_enable(dev->txco_clk);
if (err)
@ -241,23 +250,27 @@ static int bcm_gpio_set_power(struct bcm_device *dev, bool powered)
if (err)
goto err_revert_shutdown;
if (!powered && dev->clk_enabled) {
if (!powered && dev->res_enabled) {
clk_disable_unprepare(dev->txco_clk);
clk_disable_unprepare(dev->lpo_clk);
regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);
}
dev->clk_enabled = powered;
dev->res_enabled = powered;
return 0;
err_revert_shutdown:
dev->set_shutdown(dev, !powered);
err_txco_clk_disable:
if (powered && !dev->clk_enabled)
if (powered && !dev->res_enabled)
clk_disable_unprepare(dev->txco_clk);
err_lpo_clk_disable:
if (powered && !dev->clk_enabled)
if (powered && !dev->res_enabled)
clk_disable_unprepare(dev->lpo_clk);
err_regulator_disable:
if (powered && !dev->res_enabled)
regulator_bulk_disable(BCM_NUM_SUPPLIES, dev->supplies);
return err;
}
@ -936,6 +949,7 @@ static struct clk *bcm_get_txco(struct device *dev)
static int bcm_get_resources(struct bcm_device *dev)
{
const struct dmi_system_id *dmi_id;
int err;
dev->name = dev_name(dev->dev);
@ -978,6 +992,13 @@ static int bcm_get_resources(struct bcm_device *dev)
dev->set_device_wakeup = bcm_gpio_set_device_wakeup;
dev->set_shutdown = bcm_gpio_set_shutdown;
dev->supplies[0].supply = "vbat";
dev->supplies[1].supply = "vddio";
err = devm_regulator_bulk_get(dev->dev, BCM_NUM_SUPPLIES,
dev->supplies);
if (err)
return err;
/* IRQ can be declared in ACPI table as Interrupt or GpioInt */
if (dev->irq <= 0) {
struct gpio_desc *gpio;