From d210a0023590dbebb2f547d1ca3fc845b223430a Mon Sep 17 00:00:00 2001 From: Mauro Carvalho Chehab Date: Thu, 10 Sep 2020 08:00:13 +0200 Subject: [PATCH] misc: hisi_hikey_usb: add support for Hikey 970 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 Link: https://lore.kernel.org/r/62843df9927b4d8dac5dc7c4a189567fa52ab2bb.1599717402.git.mchehab+huawei@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/misc/Kconfig | 8 +-- drivers/misc/hisi_hikey_usb.c | 99 +++++++++++++++++++++++++++++------ 2 files changed, 88 insertions(+), 19 deletions(-) diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index cb5944a5fce5..e19e1dcceb41 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..2ddd4072788d 100644 --- a/drivers/misc/hisi_hikey_usb.c +++ b/drivers/misc/hisi_hikey_usb.c @@ -14,8 +14,10 @@ #include #include #include +#include #include #include +#include #include #include @@ -29,9 +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 gpio_desc *reset; + + struct regulator *regulator; struct usb_role_switch *hub_role_sw; @@ -46,23 +52,47 @@ struct hisi_hikey_usb { static void hub_power_ctrl(struct hisi_hikey_usb *hisi_hikey_usb, int value) { - gpiod_set_value_cansleep(hisi_hikey_usb->hub_vbus, value); + int ret, status; + + if (hisi_hikey_usb->hub_vbus) + 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 +147,70 @@ 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 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; + + hisi_hikey_usb->reset = devm_gpiod_get(&pdev->dev, "hub_reset_en_gpio", + GPIOD_OUT_HIGH); + if (IS_ERR(hisi_hikey_usb->reset)) + return PTR_ERR(hisi_hikey_usb->reset); + + 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 +218,6 @@ 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 +226,7 @@ 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 +252,8 @@ 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);