Add USB PHY support for CV18XX/SG200X series
This patch depends a header to build from another patch:
https://lore.kernel.org/all/IA1PR20MB4953BAA0F8E06CB202C5C2FBBB062@IA1PR20MB4953.namprd20.prod.outlook.com/
Changed from v2:
1. add item description for switch gpios.
Changed from v1:
1. remove dr_mode property and use default mode instead.
2. improve the description of `vbus_det-gpios` and `sophgo,switch-gpios`
Inochi Amaoto (2):
dt-bindings: phy: Add Sophgo CV1800 USB phy
phy: sophgo: Add USB 2.0 PHY driver for Sophgo CV18XX/SG200X
.../bindings/phy/sophgo,cv1800-usb-phy.yaml | 71 ++++
drivers/phy/Kconfig | 1 +
drivers/phy/Makefile | 1 +
drivers/phy/sophgo/Kconfig | 19 +
drivers/phy/sophgo/Makefile | 2 +
drivers/phy/sophgo/phy-cv1800-usb.c | 378 ++++++++++++++++++
6 files changed, 472 insertions(+)
create mode 100644 Documentation/devicetree/bindings/phy/sophgo,cv1800-usb-phy.yaml
create mode 100644 drivers/phy/sophgo/Kconfig
create mode 100644 drivers/phy/sophgo/Makefile
create mode 100644 drivers/phy/sophgo/phy-cv1800-usb.c
--
2.45.0
The USB phy of Sophgo CV18XX series SoC needs to sense a pin called
"VBUS_DET" to get the right operation mode. If this pin is not
connected, it only supports setting the mode manually.
Add USB phy bindings for Sophgo CV18XX/SG200X series SoC.
Signed-off-by: Inochi Amaoto <[email protected]>
---
.../bindings/phy/sophgo,cv1800-usb-phy.yaml | 71 +++++++++++++++++++
1 file changed, 71 insertions(+)
create mode 100644 Documentation/devicetree/bindings/phy/sophgo,cv1800-usb-phy.yaml
diff --git a/Documentation/devicetree/bindings/phy/sophgo,cv1800-usb-phy.yaml b/Documentation/devicetree/bindings/phy/sophgo,cv1800-usb-phy.yaml
new file mode 100644
index 000000000000..ae17a8f91b0e
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/sophgo,cv1800-usb-phy.yaml
@@ -0,0 +1,71 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/sophgo,cv1800-usb-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo CV18XX/SG200X USB 2.0 PHY
+
+maintainers:
+ - Inochi Amaoto <[email protected]>
+
+properties:
+ compatible:
+ const: sophgo,cv1800-usb-phy
+
+ reg:
+ maxItems: 1
+
+ "#phy-cells":
+ const: 0
+
+ clocks:
+ items:
+ - description: PHY clock
+ - description: PHY app clock
+ - description: PHY stb clock
+ - description: PHY lpm clock
+
+ clock-names:
+ items:
+ - const: phy
+ - const: app
+ - const: stb
+ - const: lpm
+
+ vbus_det-gpios:
+ description: GPIO to the USB OTG VBUS detect pin. This should not be
+ defined if vbus_det pin and switch pin are connected, which may
+ break the VBUS detection.
+ maxItems: 1
+
+ sophgo,switch-gpios:
+ description: GPIO array for the phy to control connected switch. For
+ host mode, the driver will set these GPIOs to low one by one. For
+ device mode, the driver will set these GPIOs to high in reverse
+ order. For a reference design, see item description.
+ minItems: 1
+ items:
+ - description: USB switch operation mode
+ - description: USB switch host power control
+
+required:
+ - compatible
+ - "#phy-cells"
+ - clocks
+ - clock-names
+
+additionalProperties: false
+
+examples:
+ - |
+ phy@48 {
+ compatible = "sophgo,cv1800-usb-phy";
+ reg = <0x48 0x4>;
+ #phy-cells = <0>;
+ clocks = <&clk 92>, <&clk 93>,
+ <&clk 94>, <&clk 95>;
+ clock-names = "phy", "app", "stb", "lpm";
+ };
+
+...
--
2.45.0
Add USB 2.0 PHY driver for Sophgo CV18XX/SG200X.
Signed-off-by: Inochi Amaoto <[email protected]>
---
drivers/phy/Kconfig | 1 +
drivers/phy/Makefile | 1 +
drivers/phy/sophgo/Kconfig | 19 ++
drivers/phy/sophgo/Makefile | 2 +
drivers/phy/sophgo/phy-cv1800-usb.c | 378 ++++++++++++++++++++++++++++
5 files changed, 401 insertions(+)
create mode 100644 drivers/phy/sophgo/Kconfig
create mode 100644 drivers/phy/sophgo/Makefile
create mode 100644 drivers/phy/sophgo/phy-cv1800-usb.c
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 787354b849c7..596b37ab3191 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -92,6 +92,7 @@ source "drivers/phy/renesas/Kconfig"
source "drivers/phy/rockchip/Kconfig"
source "drivers/phy/samsung/Kconfig"
source "drivers/phy/socionext/Kconfig"
+source "drivers/phy/sophgo/Kconfig"
source "drivers/phy/st/Kconfig"
source "drivers/phy/starfive/Kconfig"
source "drivers/phy/sunplus/Kconfig"
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index 868a220ed0f6..7ff32f0ae08a 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -31,6 +31,7 @@ obj-y += allwinner/ \
rockchip/ \
samsung/ \
socionext/ \
+ sophgo/ \
st/ \
starfive/ \
sunplus/ \
diff --git a/drivers/phy/sophgo/Kconfig b/drivers/phy/sophgo/Kconfig
new file mode 100644
index 000000000000..b1c558de6616
--- /dev/null
+++ b/drivers/phy/sophgo/Kconfig
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Phy drivers for Sophgo platforms
+#
+
+if ARCH_SOPHGO || COMPILE_TEST
+
+config PHY_SOPHGO_CV1800_USB
+ tristate "Sophgo CV18XX/SG200X USB 2.0 PHY support"
+ depends on MFD_SYSCON
+ depends on USB_SUPPORT
+ select GENERIC_PHY
+ help
+ Enable this to support the USB 2.0 PHY used with
+ the DWC2 USB controller in Sophgo CV18XX/SG200X
+ series SoC.
+ If unsure, say N.
+
+endif # ARCH_SOPHGO || COMPILE_TEST
diff --git a/drivers/phy/sophgo/Makefile b/drivers/phy/sophgo/Makefile
new file mode 100644
index 000000000000..659537054cd4
--- /dev/null
+++ b/drivers/phy/sophgo/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_PHY_SOPHGO_CV1800_USB) += phy-cv1800-usb.o
diff --git a/drivers/phy/sophgo/phy-cv1800-usb.c b/drivers/phy/sophgo/phy-cv1800-usb.c
new file mode 100644
index 000000000000..bf1b86f7aa1a
--- /dev/null
+++ b/drivers/phy/sophgo/phy-cv1800-usb.c
@@ -0,0 +1,378 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2024 Inochi Amaoto <[email protected]>
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/debugfs.h>
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/phy/phy.h>
+#include <linux/regmap.h>
+#include <linux/spinlock.h>
+#include <soc/sophgo/cv1800-sysctl.h>
+
+#define PHY_IDPAD_C_OW BIT(6)
+#define PHY_IDPAD_C_SW BIT(7)
+
+#define PHY_BASE_CLK_RATE 300000000
+#define PHY_APP_CLK_RATE 125000000
+#define PHY_LPM_CLK_RATE 12000000
+#define PHY_STB_CLK_RATE 333334
+
+#define PHY_VBUS_DET_DEBOUNCE_TIME usecs_to_jiffies(100)
+
+struct cv1800_usb_phy {
+ struct phy *phy;
+ struct regmap *syscon;
+ spinlock_t lock;
+ struct clk *usb_phy_clk;
+ struct clk *usb_app_clk;
+ struct clk *usb_lpm_clk;
+ struct clk *usb_stb_clk;
+ struct gpio_descs *switch_gpios;
+ struct gpio_desc *vbus_det_gpio;
+ int vbus_det_irq;
+ struct delayed_work vbus_work;
+ bool enable_otg;
+};
+
+static int cv1800_usb_phy_set_idpad(struct cv1800_usb_phy *phy,
+ bool is_host)
+{
+ unsigned long flags;
+ unsigned int regval = 0;
+ int ret;
+
+ if (is_host)
+ regval = PHY_IDPAD_C_OW;
+ else
+ regval = PHY_IDPAD_C_OW | PHY_IDPAD_C_SW;
+
+ spin_lock_irqsave(&phy->lock, flags);
+ ret = regmap_update_bits(phy->syscon, CV1800_USB_PHY_CTRL_REG,
+ PHY_IDPAD_C_OW | PHY_IDPAD_C_SW,
+ regval);
+ spin_unlock_irqrestore(&phy->lock, flags);
+
+ return ret;
+}
+
+static void cv1800_usb_phy_set_gpio(struct cv1800_usb_phy *phy,
+ bool is_host)
+{
+ unsigned int i, ndescs;
+ struct gpio_desc **gpios;
+
+ if (!phy->switch_gpios)
+ return;
+
+ ndescs = phy->switch_gpios->ndescs;
+ gpios = phy->switch_gpios->desc;
+
+ if (is_host) {
+ for (i = 0; i < ndescs; i++)
+ gpiod_set_value_cansleep(gpios[i], 0);
+ } else {
+ for (i = 0; i < ndescs; i++)
+ gpiod_set_value_cansleep(gpios[ndescs - 1 - i], 1);
+ }
+}
+
+static int cv1800_usb_phy_set_mode_internal(struct cv1800_usb_phy *phy,
+ bool is_host)
+{
+ int ret = cv1800_usb_phy_set_idpad(phy, is_host);
+
+ if (ret < 0)
+ return ret;
+
+ cv1800_usb_phy_set_gpio(phy, is_host);
+
+ return 0;
+}
+
+static ssize_t dr_mode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct cv1800_usb_phy *phy = dev_get_drvdata(dev);
+ bool is_host;
+
+ if (sysfs_streq(buf, "host")) {
+ phy->enable_otg = false;
+ is_host = true;
+ } else if (sysfs_streq(buf, "peripheral")) {
+ phy->enable_otg = false;
+ is_host = false;
+ } else if (sysfs_streq(buf, "otg") && phy->vbus_det_irq > 0) {
+ phy->enable_otg = true;
+ } else {
+ return -EINVAL;
+ }
+
+ if (phy->enable_otg)
+ queue_delayed_work(system_wq, &phy->vbus_work,
+ PHY_VBUS_DET_DEBOUNCE_TIME);
+ else
+ cv1800_usb_phy_set_mode_internal(phy, is_host);
+
+ return len;
+}
+
+static ssize_t dr_mode_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct cv1800_usb_phy *phy = dev_get_drvdata(dev);
+ unsigned long flags;
+ unsigned int regval;
+ bool is_host = true;
+ int ret;
+
+ spin_lock_irqsave(&phy->lock, flags);
+ ret = regmap_read(phy->syscon, CV1800_USB_PHY_CTRL_REG, ®val);
+ spin_unlock_irqrestore(&phy->lock, flags);
+
+ if (ret)
+ return ret;
+
+ if (regval & PHY_IDPAD_C_SW)
+ is_host = false;
+
+ return sprintf(buf, "%s%s\n",
+ phy->enable_otg ? "otg: " : "",
+ is_host ? "host" : "peripheral");
+}
+
+static DEVICE_ATTR_RW(dr_mode);
+
+static struct attribute *cv1800_usb_phy_attrs[] = {
+ &dev_attr_dr_mode.attr,
+ NULL
+};
+
+static const struct attribute_group cv1800_usb_phy_group = {
+ .attrs = cv1800_usb_phy_attrs,
+};
+
+static int cv1800_usb_phy_set_clock(struct cv1800_usb_phy *phy)
+{
+ int ret;
+
+ ret = clk_set_rate(phy->usb_phy_clk, PHY_BASE_CLK_RATE);
+ if (ret)
+ return ret;
+
+ ret = clk_set_rate(phy->usb_app_clk, PHY_APP_CLK_RATE);
+ if (ret)
+ return ret;
+
+ ret = clk_set_rate(phy->usb_lpm_clk, PHY_LPM_CLK_RATE);
+ if (ret)
+ return ret;
+
+ ret = clk_set_rate(phy->usb_stb_clk, PHY_STB_CLK_RATE);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int cv1800_usb_phy_set_mode(struct phy *_phy,
+ enum phy_mode mode, int submode)
+{
+ struct cv1800_usb_phy *phy = phy_get_drvdata(_phy);
+ bool is_host;
+
+ switch (mode) {
+ case PHY_MODE_USB_DEVICE:
+ is_host = false;
+ phy->enable_otg = false;
+ break;
+ case PHY_MODE_USB_HOST:
+ is_host = true;
+ phy->enable_otg = false;
+ break;
+ case PHY_MODE_USB_OTG:
+ /* phy only supports soft OTG when VBUS_DET pin is connected. */
+ if (phy->vbus_det_irq > 0) {
+ phy->enable_otg = true;
+ queue_delayed_work(system_wq, &phy->vbus_work,
+ PHY_VBUS_DET_DEBOUNCE_TIME);
+ }
+ return 0;
+ default:
+ return -EINVAL;
+ }
+
+ return cv1800_usb_phy_set_mode_internal(phy, is_host);
+}
+
+static const struct phy_ops cv1800_usb_phy_ops = {
+ .set_mode = cv1800_usb_phy_set_mode,
+ .owner = THIS_MODULE,
+};
+
+static void cv1800_usb_phy_vbus_switch(struct work_struct *work)
+{
+ struct cv1800_usb_phy *phy =
+ container_of(work, struct cv1800_usb_phy, vbus_work.work);
+ int state = gpiod_get_value_cansleep(phy->vbus_det_gpio);
+
+ cv1800_usb_phy_set_mode_internal(phy, state == 0);
+}
+
+static irqreturn_t cv1800_usb_phy_vbus_det_irq(int irq, void *dev_id)
+{
+ struct cv1800_usb_phy *phy = dev_id;
+
+ if (phy->enable_otg)
+ queue_delayed_work(system_wq, &phy->vbus_work,
+ PHY_VBUS_DET_DEBOUNCE_TIME);
+ return IRQ_HANDLED;
+}
+
+static void cv1800_usb_phy_init_mode(struct device *dev,
+ struct cv1800_usb_phy *phy)
+{
+ phy->enable_otg = false;
+
+ if (phy->vbus_det_irq > 0)
+ phy->enable_otg = true;
+
+ if (phy->enable_otg)
+ queue_delayed_work(system_wq, &phy->vbus_work, 0);
+ else
+ cv1800_usb_phy_set_mode_internal(phy, true);
+}
+
+static int cv1800_usb_phy_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device *parent = dev->parent;
+ struct cv1800_usb_phy *phy;
+ struct phy_provider *phy_provider;
+ int ret;
+
+ if (!parent)
+ return -ENODEV;
+
+ phy = devm_kmalloc(dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy)
+ return -ENOMEM;
+
+ phy->syscon = syscon_node_to_regmap(parent->of_node);
+ if (IS_ERR_OR_NULL(phy->syscon))
+ return -ENODEV;
+
+ spin_lock_init(&phy->lock);
+
+ phy->usb_phy_clk = devm_clk_get_enabled(dev, "phy");
+ if (IS_ERR(phy->usb_phy_clk))
+ return dev_err_probe(dev, PTR_ERR(phy->usb_phy_clk),
+ "Failed to get phy clock\n");
+
+ phy->usb_app_clk = devm_clk_get_enabled(dev, "app");
+ if (IS_ERR(phy->usb_app_clk))
+ return dev_err_probe(dev, PTR_ERR(phy->usb_app_clk),
+ "Failed to get app clock\n");
+
+ phy->usb_lpm_clk = devm_clk_get_enabled(dev, "lpm");
+ if (IS_ERR(phy->usb_lpm_clk))
+ return dev_err_probe(dev, PTR_ERR(phy->usb_lpm_clk),
+ "Failed to get lpm clock\n");
+
+ phy->usb_stb_clk = devm_clk_get_enabled(dev, "stb");
+ if (IS_ERR(phy->usb_stb_clk))
+ return dev_err_probe(dev, PTR_ERR(phy->usb_stb_clk),
+ "Failed to get stb clock\n");
+
+ phy->phy = devm_phy_create(dev, NULL, &cv1800_usb_phy_ops);
+ if (IS_ERR(phy->phy))
+ return dev_err_probe(dev, PTR_ERR(phy->phy),
+ "Failed to create phy\n");
+
+ ret = cv1800_usb_phy_set_clock(phy);
+ if (ret)
+ return ret;
+
+ phy->switch_gpios = devm_gpiod_get_array_optional(dev, "sophgo,switch",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(phy->switch_gpios))
+ return dev_err_probe(dev, PTR_ERR(phy->switch_gpios),
+ "Failed to get switch pin\n");
+
+ phy->vbus_det_gpio = devm_gpiod_get_optional(dev, "vbus_det", GPIOD_IN);
+ if (IS_ERR(phy->vbus_det_gpio))
+ return dev_err_probe(dev, PTR_ERR(phy->vbus_det_gpio),
+ "Failed to process vbus pin\n");
+
+ phy->vbus_det_irq = gpiod_to_irq(phy->vbus_det_gpio);
+ if (phy->vbus_det_irq > 0) {
+ ret = devm_request_irq(dev, phy->vbus_det_irq,
+ cv1800_usb_phy_vbus_det_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
+ "usb-vbus-det", phy);
+ if (ret)
+ return dev_err_probe(dev, ret,
+ "Failed to request vbus irq\n");
+ }
+
+ INIT_DELAYED_WORK(&phy->vbus_work, cv1800_usb_phy_vbus_switch);
+
+ ret = sysfs_create_group(&dev->kobj, &cv1800_usb_phy_group);
+ if (ret)
+ dev_warn(dev, "failed to create sysfs attributes\n");
+
+ phy_set_drvdata(phy->phy, phy);
+ platform_set_drvdata(pdev, phy);
+ phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+
+ /*
+ * phy needs to change mode twice after initialization,
+ * otherwise the controller can not found devices attached
+ * to the phy.
+ */
+ cv1800_usb_phy_set_idpad(phy, false);
+ cv1800_usb_phy_set_idpad(phy, true);
+ cv1800_usb_phy_init_mode(dev, phy);
+
+ return PTR_ERR_OR_ZERO(phy_provider);
+}
+
+static void cv1800_usb_phy_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cv1800_usb_phy *phy = platform_get_drvdata(pdev);
+
+ if (phy->vbus_det_irq > 0)
+ devm_free_irq(dev, phy->vbus_det_irq, phy);
+
+ cancel_delayed_work_sync(&phy->vbus_work);
+}
+
+static const struct of_device_id cv1800_usb_phy_ids[] = {
+ { .compatible = "sophgo,cv1800-usb-phy" },
+ { },
+};
+MODULE_DEVICE_TABLE(of, cv1800_usb_phy_ids);
+
+static struct platform_driver cv1800_usb_phy_driver = {
+ .probe = cv1800_usb_phy_probe,
+ .remove_new = cv1800_usb_phy_remove,
+ .driver = {
+ .name = "cv1800-usb-phy",
+ .of_match_table = cv1800_usb_phy_ids,
+ },
+};
+module_platform_driver(cv1800_usb_phy_driver);
+MODULE_DESCRIPTION("CV1800/SG2000 SoC USB 2.0 PHY driver");
+MODULE_LICENSE("GPL");
--
2.45.0
On 05/05/2024 03:52, Inochi Amaoto wrote:
> The USB phy of Sophgo CV18XX series SoC needs to sense a pin called
> "VBUS_DET" to get the right operation mode. If this pin is not
> connected, it only supports setting the mode manually.
>
> Add USB phy bindings for Sophgo CV18XX/SG200X series SoC.
..
> +
> + clock-names:
> + items:
> + - const: phy
> + - const: app
> + - const: stb
> + - const: lpm
> +
> + vbus_det-gpios:
No underscores.
> + description: GPIO to the USB OTG VBUS detect pin. This should not be
> + defined if vbus_det pin and switch pin are connected, which may
> + break the VBUS detection.
Why is this property of the PHY? VBUS pin goes to the connector, doesn't
it? It looks like you combined two or three (!!!) bindings into one.
> + maxItems: 1
> +
> + sophgo,switch-gpios:
> + description: GPIO array for the phy to control connected switch. For
Switch? This is a binding of the phy, not switch...
> + host mode, the driver will set these GPIOs to low one by one. For
Yeah, you mention driver which further confirms this is a property for
driver, not hardware.
Describe your hardware, not driver behavior.
> + device mode, the driver will set these GPIOs to high in reverse
> + order. For a reference design, see item description.
> + minItems: 1
> + items:
> + - description: USB switch operation mode
> + - description: USB switch host power control
> +
> +required:
> + - compatible
> + - "#phy-cells"
> + - clocks
> + - clock-names
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + phy@48 {
> + compatible = "sophgo,cv1800-usb-phy";
> + reg = <0x48 0x4>;
> + #phy-cells = <0>;
> + clocks = <&clk 92>, <&clk 93>,
> + <&clk 94>, <&clk 95>;
> + clock-names = "phy", "app", "stb", "lpm";
Make the example complete.
Best regards,
Krzysztof
On Mon, May 06, 2024 at 08:51:59AM GMT, Krzysztof Kozlowski wrote:
> On 05/05/2024 03:52, Inochi Amaoto wrote:
> > The USB phy of Sophgo CV18XX series SoC needs to sense a pin called
> > "VBUS_DET" to get the right operation mode. If this pin is not
> > connected, it only supports setting the mode manually.
> >
> > Add USB phy bindings for Sophgo CV18XX/SG200X series SoC.
>
> ...
>
> > +
> > + clock-names:
> > + items:
> > + - const: phy
> > + - const: app
> > + - const: stb
> > + - const: lpm
> > +
> > + vbus_det-gpios:
>
> No underscores.
>
Thanks.
> > + description: GPIO to the USB OTG VBUS detect pin. This should not be
> > + defined if vbus_det pin and switch pin are connected, which may
> > + break the VBUS detection.
>
> Why is this property of the PHY? VBUS pin goes to the connector, doesn't
> it? It looks like you combined two or three (!!!) bindings into one.
>
Yes, but I am not sure which is the best to write this bindings.
The topology of USB likes this:
controller -- phy -- switch --> (host) port/hub
--> (device) port
The vbus-detect connect to the device port, but it will change the mode for
both phy and switch. And the switch is just a switching circuit.
I am pretty confused on how to split this binding. I think it may like the
following:
phy {
switch {
/* This is the switch in the follows */
connector1 {
/* host port */
};
connector2 {
/* device port*/
/* the vbus pin is here */
};
};
};
Could you share some suggestion on this?
> > + maxItems: 1
> > +
> > + sophgo,switch-gpios:
> > + description: GPIO array for the phy to control connected switch. For
>
> Switch? This is a binding of the phy, not switch...
>
You are right, I think this switch may be more like a pattern device.
> > + host mode, the driver will set these GPIOs to low one by one. For
>
> Yeah, you mention driver which further confirms this is a property for
> driver, not hardware.
>
> Describe your hardware, not driver behavior.
OK, I will remove this.
>
>
> > + device mode, the driver will set these GPIOs to high in reverse
> > + order. For a reference design, see item description.
> > + minItems: 1
> > + items:
> > + - description: USB switch operation mode
> > + - description: USB switch host power control
> > +
> > +required:
> > + - compatible
> > + - "#phy-cells"
> > + - clocks
> > + - clock-names
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > + - |
> > + phy@48 {
> > + compatible = "sophgo,cv1800-usb-phy";
> > + reg = <0x48 0x4>;
> > + #phy-cells = <0>;
> > + clocks = <&clk 92>, <&clk 93>,
> > + <&clk 94>, <&clk 95>;
> > + clock-names = "phy", "app", "stb", "lpm";
>
> Make the example complete.
>
>
>
> Best regards,
> Krzysztof
>
On Mon, May 06, 2024 at 08:17:30PM +0800, Inochi Amaoto wrote:
> On Mon, May 06, 2024 at 08:51:59AM GMT, Krzysztof Kozlowski wrote:
> > On 05/05/2024 03:52, Inochi Amaoto wrote:
> > > The USB phy of Sophgo CV18XX series SoC needs to sense a pin called
> > > "VBUS_DET" to get the right operation mode. If this pin is not
> > > connected, it only supports setting the mode manually.
> > >
> > > Add USB phy bindings for Sophgo CV18XX/SG200X series SoC.
> >
> > ...
> >
> > > +
> > > + clock-names:
> > > + items:
> > > + - const: phy
> > > + - const: app
> > > + - const: stb
> > > + - const: lpm
> > > +
> > > + vbus_det-gpios:
> >
> > No underscores.
> >
>
> Thanks.
>
> > > + description: GPIO to the USB OTG VBUS detect pin. This should not be
> > > + defined if vbus_det pin and switch pin are connected, which may
> > > + break the VBUS detection.
> >
> > Why is this property of the PHY? VBUS pin goes to the connector, doesn't
> > it? It looks like you combined two or three (!!!) bindings into one.
> >
>
> Yes, but I am not sure which is the best to write this bindings.
> The topology of USB likes this:
>
> controller -- phy -- switch --> (host) port/hub
> --> (device) port
>
> The vbus-detect connect to the device port, but it will change the mode for
> both phy and switch. And the switch is just a switching circuit.
> I am pretty confused on how to split this binding. I think it may like the
> following:
>
> phy {
> switch {
> /* This is the switch in the follows */
> connector1 {
> /* host port */
> };
> connector2 {
> /* device port*/
> /* the vbus pin is here */
> };
> };
> };
>
> Could you share some suggestion on this?
Something like the above assuming 2 physical connectors, but probably
should be a child of the USB controller or on its own. PHYs usually
aren't put into a parent/child hierarchy, but are out of band.
Is this switch implemented on the board level? If so, you should create
something that would work on any platform with a GPIO controlled USB
switch like this.
Rob