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Subject[PATCH v2 09/11] misc: hisi_hikey_usb: add support for Hikey 970
Date
The HiKey 970 board is similar to Hikey 960 with regards
to its USB configutation: it also relies on a USB HUB
that is used when DWC3 is at host mode.

However, it requires a few extra DT settings, as it
uses a voltage regulator and GPIO reset pin.

Add support for them.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
---
drivers/misc/Kconfig | 8 +--
drivers/misc/hisi_hikey_usb.c | 112 +++++++++++++++++++++++++++++-----
2 files changed, 102 insertions(+), 18 deletions(-)

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index fb15364f32d2..e9c38dee2b90 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -457,13 +457,13 @@ config PVPANIC
(guest) communicate panic events to the host.

config HISI_HIKEY_USB
- tristate "USB GPIO Hub on HiSilicon Hikey960 Platform"
+ tristate "USB GPIO Hub on HiSilicon Hikey 960/970 Platform"
depends on (OF && GPIOLIB) || COMPILE_TEST
help
If you say yes here this adds support for the on-board USB GPIO hub
- found on the HiKey960, which is necessary to support switching
- between the dual-role USB-C port and the USB-A host ports using only
- one USB controller.
+ found on HiKey 960/970 boards, which is necessary to support
+ switching between the dual-role USB-C port and the USB-A host ports
+ using only one USB controller.

source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
diff --git a/drivers/misc/hisi_hikey_usb.c b/drivers/misc/hisi_hikey_usb.c
index 3a98a890757c..b884680867a5 100644
--- a/drivers/misc/hisi_hikey_usb.c
+++ b/drivers/misc/hisi_hikey_usb.c
@@ -14,8 +14,10 @@
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/notifier.h>
+#include <linux/of_gpio.h>
#include <linux/platform_device.h>
#include <linux/property.h>
+#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/usb/role.h>

@@ -29,10 +31,13 @@
#define TYPEC_VBUS_POWER_OFF 0

struct hisi_hikey_usb {
+ struct device *dev;
struct gpio_desc *otg_switch;
struct gpio_desc *typec_vbus;
struct gpio_desc *hub_vbus;

+ struct regulator *regulator;
+
struct usb_role_switch *hub_role_sw;

struct usb_role_switch *dev_role_sw;
@@ -46,23 +51,49 @@ struct hisi_hikey_usb {

static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value)
{
+ int ret, status;
+
+ if (!hisi_hikey_usb->hub_vbus)
+ return;
+
gpiod_set_value_cansleep(hisi_hikey_usb->hub_vbus, value);
+
+ if (!hisi_hikey_usb->regulator)
+ return;
+
+ status = regulator_is_enabled(hisi_hikey_usb->regulator);
+ if (status == !!value)
+ return;
+
+ if (value)
+ ret = regulator_enable(hisi_hikey_usb->regulator);
+ else
+ ret = regulator_disable(hisi_hikey_usb->regulator);
+
+ if (ret)
+ dev_err(hisi_hikey_usb->dev,
+ "Can't switch regulator state to %s\n",
+ value ? "enabled" : "disabled");
}

static void usb_switch_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
int switch_to)
{
+ if (!hisi_hikey_usb->otg_switch)
+ return;
+
gpiod_set_value_cansleep(hisi_hikey_usb->otg_switch, switch_to);
}

static void usb_typec_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb,
int value)
{
+ if (!hisi_hikey_usb->typec_vbus)
+ return;
+
gpiod_set_value_cansleep(hisi_hikey_usb->typec_vbus, value);
}

-
-
static void relay_set_role_switch(struct work_struct *work)
{
struct hisi_hikey_usb *hisi_hikey_usb = container_of(work,
@@ -117,31 +148,84 @@ static int hub_usb_role_switch_set(struct usb_role_switch *sw, enum usb_role rol
return 0;
}

+static int hisi_hikey_usb_parse_kirin970(struct platform_device *pdev,
+ struct hisi_hikey_usb *hisi_hikey_usb)
+{
+ struct regulator *regulator;
+ int hub_reset_en_gpio;
+ int ret;
+
+ regulator = devm_regulator_get(&pdev->dev, "hub-vdd");
+ if (IS_ERR(regulator)) {
+ if (PTR_ERR(regulator) == -EPROBE_DEFER) {
+ dev_info(&pdev->dev,
+ "waiting for hub-vdd-supply to be probed\n");
+ return PTR_ERR(regulator);
+ }
+ dev_err(&pdev->dev,
+ "get hub-vdd-supply failed with error %ld\n",
+ PTR_ERR(regulator));
+ return PTR_ERR(regulator);
+ }
+ hisi_hikey_usb->regulator = regulator;
+
+ hub_reset_en_gpio = of_get_named_gpio(pdev->dev.of_node,
+ "hub_reset_en_gpio", 0);
+ if (!gpio_is_valid(hub_reset_en_gpio)) {
+ dev_err(&pdev->dev, "Failed to get a valid reset gpio\n");
+ return -ENODEV;
+ }
+
+ ret = devm_gpio_request(&pdev->dev, hub_reset_en_gpio,
+ "hub_reset_en_gpio");
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to request the reset gpio\n");
+ return ret;
+ }
+ ret = gpio_direction_output(hub_reset_en_gpio, 1);
+ if (ret)
+ dev_err(&pdev->dev,
+ "Failed to set the direction of the reset gpio\n");
+
+ return ret;
+}
+
static int hisi_hikey_usb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct hisi_hikey_usb *hisi_hikey_usb;
struct usb_role_switch_desc hub_role_switch = {NULL};
+ int ret;

hisi_hikey_usb = devm_kzalloc(dev, sizeof(*hisi_hikey_usb), GFP_KERNEL);
if (!hisi_hikey_usb)
return -ENOMEM;

- hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
- GPIOD_OUT_LOW);
- if (IS_ERR(hisi_hikey_usb->typec_vbus))
- return PTR_ERR(hisi_hikey_usb->typec_vbus);
+ hisi_hikey_usb->dev = &pdev->dev;

hisi_hikey_usb->otg_switch = devm_gpiod_get(dev, "otg-switch",
GPIOD_OUT_HIGH);
if (IS_ERR(hisi_hikey_usb->otg_switch))
return PTR_ERR(hisi_hikey_usb->otg_switch);

- /* hub-vdd33-en is optional */
- hisi_hikey_usb->hub_vbus = devm_gpiod_get_optional(dev, "hub-vdd33-en",
- GPIOD_OUT_HIGH);
- if (IS_ERR(hisi_hikey_usb->hub_vbus))
- return PTR_ERR(hisi_hikey_usb->hub_vbus);
+ hisi_hikey_usb->typec_vbus = devm_gpiod_get(dev, "typec-vbus",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(hisi_hikey_usb->typec_vbus))
+ return PTR_ERR(hisi_hikey_usb->typec_vbus);
+
+ /* Parse Kirin 970-specific OF data */
+ if (of_device_is_compatible(pdev->dev.of_node,
+ "hisilicon,kirin970_hikey_usbhub")) {
+ ret = hisi_hikey_usb_parse_kirin970(pdev, hisi_hikey_usb);
+ if (ret)
+ return ret;
+ } else {
+ /* hub-vdd33-en is optional */
+ hisi_hikey_usb->hub_vbus = devm_gpiod_get_optional(dev, "hub-vdd33-en",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(hisi_hikey_usb->hub_vbus))
+ return PTR_ERR(hisi_hikey_usb->hub_vbus);
+ }

hisi_hikey_usb->dev_role_sw = usb_role_switch_get(dev);
if (!hisi_hikey_usb->dev_role_sw)
@@ -149,7 +233,6 @@ static int hisi_hikey_usb_probe(struct platform_device *pdev)
if (IS_ERR(hisi_hikey_usb->dev_role_sw))
return PTR_ERR(hisi_hikey_usb->dev_role_sw);

-
INIT_WORK(&hisi_hikey_usb->work, relay_set_role_switch);
mutex_init(&hisi_hikey_usb->lock);

@@ -158,7 +241,7 @@ static int hisi_hikey_usb_probe(struct platform_device *pdev)
hub_role_switch.driver_data = hisi_hikey_usb;

hisi_hikey_usb->hub_role_sw = usb_role_switch_register(dev,
- &hub_role_switch);
+ &hub_role_switch);

if (IS_ERR(hisi_hikey_usb->hub_role_sw)) {
usb_role_switch_put(hisi_hikey_usb->dev_role_sw);
@@ -184,7 +267,8 @@ static int hisi_hikey_usb_remove(struct platform_device *pdev)
}

static const struct of_device_id id_table_hisi_hikey_usb[] = {
- {.compatible = "hisilicon,gpio_hubv1"},
+ { .compatible = "hisilicon,gpio_hubv1" },
+ { .compatible = "hisilicon,kirin970_hikey_usbhub" },
{}
};
MODULE_DEVICE_TABLE(of, id_table_hisi_hikey_usb);
--
2.26.2
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