[PATCH v2 0/3] Stingray usb phy driver support

[PATCH v2 0/3] Stingray usb phy driver support

[Srinath Mannam]

These patches add stingray usb phy driver and its
corresponding DT nodes with documentation.

All patches are based on Linux-4.19.

Changes from v1:
  - Addressed Kishon review comments
  - phy init call return value handle
  
Srinath Mannam (3):
  dt-bindings: phy: Add binding document for stingray usb phy
  phy: sr-usb: Add stingray usb phy driver
  arm64: dts: Add USB DT nodes for Stingray SoC

 .../bindings/phy/brcm,stingray-usb-phy.txt         |  62 ++++
 .../boot/dts/broadcom/stingray/stingray-usb.dtsi   |  95 ++++++
 .../arm64/boot/dts/broadcom/stingray/stingray.dtsi |   1 +
 drivers/phy/broadcom/Kconfig                       |  11 +
 drivers/phy/broadcom/Makefile                      |   1 +
 drivers/phy/broadcom/phy-bcm-sr-usb.c              | 373 +++++++++++++++++++++
 6 files changed, 543 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/brcm,stingray-usb-phy.txt
 create mode 100644 arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi
 create mode 100644 drivers/phy/broadcom/phy-bcm-sr-usb.c

-- 
2.7.4

[PATCH v2 1/3] dt-bindings: phy: Add binding document for stingray usb phy

[Srinath Mannam]

Add DT binding document for stingray usb phy.

Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
---
 .../bindings/phy/brcm,stingray-usb-phy.txt         | 62 ++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/brcm,stingray-usb-phy.txt

diff --git a/Documentation/devicetree/bindings/phy/brcm,stingray-usb-phy.txt b/Documentation/devicetree/bindings/phy/brcm,stingray-usb-phy.txt
new file mode 100644
index 0000000..bfe1367
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/brcm,stingray-usb-phy.txt
@@ -0,0 +1,62 @@
+Broadcom Stingray USB PHY
+
+Required properties:
+ - compatible : should be one of the listed compatibles
+	- "brcm,sr-usb-phy"
+	- "brcm,sr-usb-phy-v2"
+ - reg: offset and length of the PHY blocks registers
+ - address-cells: should be 1
+ - size-cells: should be 0
+
+Sub-nodes:
+  Each port's PHY should be represented as a sub-node.
+
+Sub-nodes required properties:
+ - reg: required for brcm,sr-usb-phy model phy.
+	reg value 0 is HS phy and 1 is SS phy.
+ - phy-cells: generic PHY binding; must be 0
+
+Refer to phy/phy-bindings.txt for the generic PHY binding properties
+
+Example:
+	usbphy0: usb-phy@0 {
+		compatible = "brcm,sr-usb-phy";
+		reg = <0x00000000 0x100>;
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		usb0_phy0: phy@0 {
+			reg = <0>;
+			#phy-cells = <0>;
+		};
+
+		usb0_phy1: phy@1 {
+			reg = <1>;
+			#phy-cells = <0>;
+		};
+	};
+
+	usbphy1: usb-phy@10000 {
+		compatible = "brcm,sr-usb-phy";
+		reg = <0x00010000 0x100>,
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		usb1_phy0: phy@0 {
+			reg = <0>;
+			#phy-cells = <0>;
+		};
+
+		usb1_phy1: phy@1 {
+			reg = <1>;
+			#phy-cells = <0>;
+		};
+	};
+
+	usbphy2: usb-phy@20000 {
+		compatible = "brcm,sr-usb-phy-v2";
+		reg = <0x00020000 0x100>,
+		#address-cells = <1>;
+		#size-cells = <0>;
+		#phy-cells = <0>;
+	};
-- 
2.7.4

[PATCH v2 2/3] phy: sr-usb: Add stingray usb phy driver

[Srinath Mannam]

This driver supports all versions of stingray SS and HS
USB phys.
In version 1 is combo phy contain both SS and HS phys
in a common IO space.
In version 2 a single HS phy.
These phys support both xHCI host driver and
BDC Broadcom device controller driver.

Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
---
 drivers/phy/broadcom/Kconfig          |  11 +
 drivers/phy/broadcom/Makefile         |   1 +
 drivers/phy/broadcom/phy-bcm-sr-usb.c | 373 ++++++++++++++++++++++++++++++++++
 3 files changed, 385 insertions(+)
 create mode 100644 drivers/phy/broadcom/phy-bcm-sr-usb.c

diff --git a/drivers/phy/broadcom/Kconfig b/drivers/phy/broadcom/Kconfig
index 8786a96..c1e4dd5 100644
--- a/drivers/phy/broadcom/Kconfig
+++ b/drivers/phy/broadcom/Kconfig
@@ -10,6 +10,17 @@ config PHY_CYGNUS_PCIE
 	  Enable this to support the Broadcom Cygnus PCIe PHY.
 	  If unsure, say N.
 
+config PHY_BCM_SR_USB
+	tristate "Broadcom Stingray USB PHY driver"
+	depends on OF && (ARCH_BCM_IPROC || COMPILE_TEST)
+	select GENERIC_PHY
+	default ARCH_BCM_IPROC
+	help
+	  Enable this to support the Broadcom Stingray USB PHY
+	  driver. It supports all versions of Superspeed and
+	  Highspeed PHYs.
+	  If unsure, say N.
+
 config BCM_KONA_USB2_PHY
 	tristate "Broadcom Kona USB2 PHY Driver"
 	depends on HAS_IOMEM
diff --git a/drivers/phy/broadcom/Makefile b/drivers/phy/broadcom/Makefile
index 0f60184..f453c7d 100644
--- a/drivers/phy/broadcom/Makefile
+++ b/drivers/phy/broadcom/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_PHY_BRCM_USB)		+= phy-brcm-usb-dvr.o
 phy-brcm-usb-dvr-objs := phy-brcm-usb.o phy-brcm-usb-init.o
 
 obj-$(CONFIG_PHY_BCM_SR_PCIE)		+= phy-bcm-sr-pcie.o
+obj-$(CONFIG_PHY_BCM_SR_USB)		+= phy-bcm-sr-usb.o
diff --git a/drivers/phy/broadcom/phy-bcm-sr-usb.c b/drivers/phy/broadcom/phy-bcm-sr-usb.c
new file mode 100644
index 0000000..52484b3
--- /dev/null
+++ b/drivers/phy/broadcom/phy-bcm-sr-usb.c
@@ -0,0 +1,373 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2016-2018 Broadcom
+ */
+
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+enum bcm_usb_phy_version {
+	BCM_USB_PHY_V1,
+	BCM_USB_PHY_V2,
+};
+
+enum bcm_usb_phy_reg {
+	PLL_NDIV_FRAC,
+	PLL_NDIV_INT,
+	PLL_CTRL,
+	PHY_CTRL,
+	PHY_PLL_CTRL,
+};
+
+/* USB PHY registers */
+
+static const u8 bcm_usb_u3phy_v1[] = {
+	[PLL_CTRL]		= 0x18,
+	[PHY_CTRL]		= 0x14,
+};
+
+static const u8 bcm_usb_u2phy_v1[] = {
+	[PLL_NDIV_FRAC]	= 0x04,
+	[PLL_NDIV_INT]	= 0x08,
+	[PLL_CTRL]	= 0x0c,
+	[PHY_CTRL]	= 0x10,
+};
+
+#define HSPLL_NDIV_INT_VAL	0x13
+#define HSPLL_NDIV_FRAC_VAL	0x1005
+
+static const u8 bcm_usb_u2phy_v2[] = {
+	[PLL_NDIV_FRAC]	= 0x0,
+	[PLL_NDIV_INT]	= 0x4,
+	[PLL_CTRL]	= 0x8,
+	[PHY_CTRL]	= 0xc,
+};
+
+enum pll_ctrl_bits {
+	PLL_RESETB,
+	SSPLL_SUSPEND_EN,
+	PLL_SEQ_START,
+	PLL_LOCK,
+	PLL_PDIV,
+};
+
+static const u8 u3pll_ctrl[] = {
+	[PLL_RESETB]		= 0,
+	[SSPLL_SUSPEND_EN]	= 1,
+	[PLL_SEQ_START]		= 2,
+	[PLL_LOCK]		= 3,
+};
+
+#define HSPLL_PDIV_MASK		0xF
+#define HSPLL_PDIV_VAL		0x1
+
+static const u8 u2pll_ctrl[] = {
+	[PLL_PDIV]	= 1,
+	[PLL_RESETB]	= 5,
+	[PLL_LOCK]	= 6,
+};
+
+enum bcm_usb_phy_ctrl_bits {
+	CORERDY,
+	AFE_LDO_PWRDWNB,
+	AFE_PLL_PWRDWNB,
+	AFE_BG_PWRDWNB,
+	PHY_ISO,
+	PHY_RESETB,
+	PHY_PCTL,
+};
+
+#define PHY_PCTL_MASK	0xffff
+/*
+ * 0x0806 of PCTL_VAL has below bits set
+ * BIT-8 : refclk divider 1
+ * BIT-3:2: device mode; mode is not effect
+ * BIT-1: soft reset active low
+ */
+#define HSPHY_PCTL_VAL	0x0806
+#define SSPHY_PCTL_VAL	0x0006
+
+static const u8 u3phy_ctrl[] = {
+	[PHY_RESETB]	= 1,
+	[PHY_PCTL]	= 2,
+};
+
+static const u8 u2phy_ctrl[] = {
+	[CORERDY]		= 0,
+	[AFE_LDO_PWRDWNB]	= 1,
+	[AFE_PLL_PWRDWNB]	= 2,
+	[AFE_BG_PWRDWNB]	= 3,
+	[PHY_ISO]		= 4,
+	[PHY_RESETB]		= 5,
+	[PHY_PCTL]		= 6,
+};
+
+struct bcm_usb_phy_cfg {
+	uint32_t type;
+	uint32_t ver;
+	void __iomem *regs;
+	struct phy *phy;
+	const u8 *offset;
+};
+
+#define PLL_LOCK_RETRY_COUNT	1000
+
+enum bcm_usb_phy_type {
+	USB_HS_PHY,
+	USB_SS_PHY,
+};
+
+static inline void bcm_usb_reg32_clrbits(void __iomem *addr, uint32_t clear)
+{
+	writel(readl(addr) & ~clear, addr);
+}
+
+static inline void bcm_usb_reg32_setbits(void __iomem *addr, uint32_t set)
+{
+	writel(readl(addr) | set, addr);
+}
+
+static int bcm_usb_pll_lock_check(void __iomem *addr, u32 bit)
+{
+	int retry;
+	u32 rd_data;
+
+	retry = PLL_LOCK_RETRY_COUNT;
+	do {
+		rd_data = readl(addr);
+		if (rd_data & bit)
+			return 0;
+		udelay(1);
+	} while (--retry > 0);
+
+	pr_err("%s: FAIL\n", __func__);
+	return -ETIMEDOUT;
+}
+
+static int bcm_usb_ss_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
+{
+	int ret = 0;
+	void __iomem *regs = phy_cfg->regs;
+	const u8 *offset;
+	u32 rd_data;
+
+	offset = phy_cfg->offset;
+
+	/* Set pctl with mode and soft reset */
+	rd_data = readl(regs + offset[PHY_CTRL]);
+	rd_data &= ~(PHY_PCTL_MASK << u3phy_ctrl[PHY_PCTL]);
+	rd_data |= (SSPHY_PCTL_VAL << u3phy_ctrl[PHY_PCTL]);
+	writel(rd_data, regs + offset[PHY_CTRL]);
+
+	bcm_usb_reg32_clrbits(regs + offset[PLL_CTRL],
+			      BIT(u3pll_ctrl[SSPLL_SUSPEND_EN]));
+	bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
+			      BIT(u3pll_ctrl[PLL_SEQ_START]));
+	bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
+			      BIT(u3pll_ctrl[PLL_RESETB]));
+
+	/* Maximum timeout for PLL reset done */
+	msleep(30);
+
+	ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
+				     BIT(u3pll_ctrl[PLL_LOCK]));
+
+	return ret;
+}
+
+static int bcm_usb_hs_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
+{
+	int ret = 0;
+	void __iomem *regs = phy_cfg->regs;
+	const u8 *offset;
+	u32 rd_data;
+
+	offset = phy_cfg->offset;
+
+	writel(HSPLL_NDIV_INT_VAL, regs + offset[PLL_NDIV_INT]);
+	writel(HSPLL_NDIV_FRAC_VAL, regs + offset[PLL_NDIV_FRAC]);
+
+	rd_data = readl(regs + offset[PLL_CTRL]);
+	rd_data &= ~(HSPLL_PDIV_MASK << u2pll_ctrl[PLL_PDIV]);
+	rd_data |= (HSPLL_PDIV_VAL << u2pll_ctrl[PLL_PDIV]);
+	writel(rd_data, regs + offset[PLL_CTRL]);
+
+	/* Set Core Ready high */
+	bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
+			      BIT(u2phy_ctrl[CORERDY]));
+
+	/* Maximum timeout for Core Ready done */
+	msleep(30);
+
+	bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
+			      BIT(u2pll_ctrl[PLL_RESETB]));
+	bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
+			      BIT(u2phy_ctrl[PHY_RESETB]));
+
+
+	rd_data = readl(regs + offset[PHY_CTRL]);
+	rd_data &= ~(PHY_PCTL_MASK << u2phy_ctrl[PHY_PCTL]);
+	rd_data |= (HSPHY_PCTL_VAL << u2phy_ctrl[PHY_PCTL]);
+	writel(rd_data, regs + offset[PHY_CTRL]);
+
+	/* Maximum timeout for PLL reset done */
+	msleep(30);
+
+	ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
+				     BIT(u2pll_ctrl[PLL_LOCK]));
+
+	return ret;
+}
+
+static int bcm_usb_phy_reset(struct phy *phy)
+{
+	struct bcm_usb_phy_cfg *phy_cfg = phy_get_drvdata(phy);
+	void __iomem *regs = phy_cfg->regs;
+	const u8 *offset;
+
+	offset = phy_cfg->offset;
+
+	if (phy_cfg->type == USB_HS_PHY) {
+		bcm_usb_reg32_clrbits(regs + offset[PHY_CTRL],
+				      BIT(u2phy_ctrl[CORERDY]));
+		bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
+				      BIT(u2phy_ctrl[CORERDY]));
+	}
+
+	return 0;
+}
+
+static int bcm_usb_phy_init(struct phy *phy)
+{
+	struct bcm_usb_phy_cfg *phy_cfg = phy_get_drvdata(phy);
+	int ret = -EINVAL;
+
+	if (phy_cfg->type == USB_SS_PHY)
+		ret = bcm_usb_ss_phy_init(phy_cfg);
+	else if (phy_cfg->type == USB_HS_PHY)
+		ret = bcm_usb_hs_phy_init(phy_cfg);
+
+	return ret;
+}
+
+static struct phy_ops sr_phy_ops = {
+	.init		= bcm_usb_phy_init,
+	.reset		= bcm_usb_phy_reset,
+	.owner		= THIS_MODULE,
+};
+
+static int bcm_usb_phy_create(struct device *dev, struct device_node *node,
+			     void __iomem *regs, uint32_t version)
+{
+	struct bcm_usb_phy_cfg *phy_cfg;
+	struct phy_provider *phy_provider;
+
+	phy_cfg = devm_kzalloc(dev, sizeof(struct bcm_usb_phy_cfg), GFP_KERNEL);
+	if (!phy_cfg)
+		return -ENOMEM;
+
+	phy_cfg->regs = regs;
+	phy_cfg->ver = version;
+
+	if (phy_cfg->ver == BCM_USB_PHY_V1) {
+		unsigned int id;
+
+		if (of_property_read_u32(node, "reg", &id)) {
+			dev_err(dev, "missing reg property in node %s\n",
+				node->name);
+			return -EINVAL;
+		}
+
+		if (id == 0) {
+			phy_cfg->offset = bcm_usb_u2phy_v1;
+			phy_cfg->type = USB_HS_PHY;
+		} else if (id == 1) {
+			phy_cfg->offset = bcm_usb_u3phy_v1;
+			phy_cfg->type = USB_SS_PHY;
+		} else {
+			return -ENODEV;
+		}
+	} else if (phy_cfg->ver == BCM_USB_PHY_V2) {
+		phy_cfg->offset = bcm_usb_u2phy_v2;
+		phy_cfg->type = USB_HS_PHY;
+	}
+
+	phy_cfg->phy = devm_phy_create(dev, node, &sr_phy_ops);
+	if (IS_ERR(phy_cfg->phy))
+		return PTR_ERR(phy_cfg->phy);
+
+	phy_set_drvdata(phy_cfg->phy, phy_cfg);
+	phy_provider = devm_of_phy_provider_register(&phy_cfg->phy->dev,
+						     of_phy_simple_xlate);
+	if (IS_ERR(phy_provider)) {
+		dev_err(dev, "Failed to register phy provider\n");
+		return PTR_ERR(phy_provider);
+	}
+
+	return 0;
+}
+
+static const struct of_device_id bcm_usb_phy_of_match[] = {
+	{
+		.compatible = "brcm,sr-usb-phy",
+		.data = (void *)BCM_USB_PHY_V1,
+	},
+	{
+		.compatible = "brcm,sr-usb-phy-v2",
+		.data = (void *)BCM_USB_PHY_V2,
+	},
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, bcm_usb_phy_of_match);
+
+static int bcm_usb_phy_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *dn = dev->of_node, *child;
+	const struct of_device_id *of_id;
+	struct resource *res;
+	void __iomem *regs;
+	int ret;
+	enum bcm_usb_phy_version version;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	regs = devm_ioremap_resource(dev, res);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	of_id = of_match_node(bcm_usb_phy_of_match, dn);
+	if (of_id)
+		version = (enum bcm_usb_phy_version)of_id->data;
+	else
+		return -ENODEV;
+
+	if (of_get_child_count(dn) == 0)
+		return bcm_usb_phy_create(dev, dn, regs, version);
+
+	for_each_available_child_of_node(dn, child) {
+		ret = bcm_usb_phy_create(dev, child, regs, version);
+		if (ret) {
+			of_node_put(child);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static struct platform_driver bcm_usb_phy_driver = {
+	.driver = {
+		.name = "phy-bcm-sr-usb",
+		.of_match_table = bcm_usb_phy_of_match,
+	},
+	.probe = bcm_usb_phy_probe,
+};
+module_platform_driver(bcm_usb_phy_driver);
+
+MODULE_AUTHOR("Broadcom");
+MODULE_DESCRIPTION("Broadcom stingray USB Phy driver");
+MODULE_LICENSE("GPL v2");
-- 
2.7.4

[PATCH v2 3/3] arm64: dts: Add USB DT nodes for Stingray SoC

[Srinath Mannam]

Add DT nodes for
  - Two xHCI host controllers
  - Two BDC Broadcom USB device controller
  - Five USB PHY controllers

[xHCI0]      [BDC0]            [xHCI1]            [BDC1]
   |           |                  |                 |
  ---------------               -----------------------
   |           |                 |         |         |
[SS-PHY0]   [HS-PHY0]        [SS-PHY1] [HS-PHY2] [HS-PHY1]

[SS-PHY0/HS-PHY0] and [SS-PHY1/HS-PHY1] are combo PHYs of
version1 category has both SS and HS PHYs..
[HS-PHY2] is HS PHY of version2 category.

Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Scott Branden <scott.branden@broadcom.com>
---
 .../boot/dts/broadcom/stingray/stingray-usb.dtsi   | 95 ++++++++++++++++++++++
 .../arm64/boot/dts/broadcom/stingray/stingray.dtsi |  1 +
 2 files changed, 96 insertions(+)
 create mode 100644 arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi

diff --git a/arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi b/arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi
new file mode 100644
index 0000000..164a1de
--- /dev/null
+++ b/arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi
@@ -0,0 +1,95 @@
+// SPDX-License-Identifier: (GPL-2.0 or BSD-3-Clause)
+/*
+ *Copyright(c) 2018 Broadcom
+ */
+	usb {
+		compatible = "simple-bus";
+		dma-ranges;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x0 0x0 0x68500000 0x00400000>;
+
+		usbphy0: usb-phy@0 {
+			compatible = "brcm,sr-usb-phy";
+			reg = <0x00000000 0x100>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+
+			usb0_phy0: phy@0 {
+				reg = <0>;
+				#phy-cells = <0>;
+			};
+			usb0_phy1: phy@1 {
+				reg = <1>;
+				#phy-cells = <0>;
+			};
+
+		};
+
+		xhci0: usb@1000 {
+			compatible = "generic-xhci";
+			reg = <0x00001000 0x1000>;
+			interrupts = <GIC_SPI 256 IRQ_TYPE_LEVEL_HIGH>;
+			phys = <&usb0_phy1>, <&usb0_phy0>;
+			phy-names = "phy0", "phy1";
+			dma-coherent;
+			status = "disabled";
+		};
+
+		bdc0: usb@2000 {
+			compatible = "brcm,bdc-v0.16";
+			reg = <0x00002000 0x1000>;
+			interrupts = <GIC_SPI 259 IRQ_TYPE_LEVEL_HIGH>;
+			phys = <&usb0_phy1>, <&usb0_phy0>;
+			phy-names = "phy0", "phy1";
+			dma-coherent;
+			status = "disabled";
+		};
+
+		usbphy1: usb-phy@10000 {
+			compatible = "brcm,sr-usb-phy";
+			reg = <0x00010000 0x100>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			status = "disabled";
+
+			usb1_phy0: phy@0 {
+				reg = <0>;
+				#phy-cells = <0>;
+			};
+			usb1_phy1: phy@1 {
+				reg = <1>;
+				#phy-cells = <0>;
+			};
+		};
+
+		usbphy2: usb-phy@20000 {
+			compatible = "brcm,sr-usb-phy-v2";
+			reg = <0x00020000 0x100>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+			#phy-cells = <0>;
+			status = "disabled";
+		};
+
+		xhci1: usb@11000 {
+			compatible = "generic-xhci";
+			reg = <0x00011000 0x1000>;
+			interrupts = <GIC_SPI 263 IRQ_TYPE_LEVEL_HIGH>;
+			phys = <&usb1_phy1>, <&usbphy2>, <&usb1_phy0>;
+			phy-names = "phy0", "phy1", "phy2";
+			dma-coherent;
+			status = "disabled";
+		};
+
+		bdc1: usb@21000 {
+			compatible = "brcm,bdc-v0.16";
+			reg = <0x00021000 0x1000>;
+			interrupts = <GIC_SPI 266 IRQ_TYPE_LEVEL_HIGH>;
+			phys = <&usbphy2>;
+			phy-names = "phy0";
+			dma-coherent;
+			status = "disabled";
+		};
+	};
diff --git a/arch/arm64/boot/dts/broadcom/stingray/stingray.dtsi b/arch/arm64/boot/dts/broadcom/stingray/stingray.dtsi
index e283480..6927236 100644
--- a/arch/arm64/boot/dts/broadcom/stingray/stingray.dtsi
+++ b/arch/arm64/boot/dts/broadcom/stingray/stingray.dtsi
@@ -287,6 +287,7 @@
 	#include "stingray-fs4.dtsi"
 	#include "stingray-sata.dtsi"
 	#include "stingray-pcie.dtsi"
+	#include "stingray-usb.dtsi"
 
 	hsls {
 		compatible = "simple-bus";
-- 
2.7.4

Re: [PATCH v2 2/3] phy: sr-usb: Add stingray usb phy driver

[Kishon Vijay Abraham I]

Hi,

On 03/12/18 2:06 PM, Srinath Mannam wrote:
> This driver supports all versions of stingray SS and HS
> USB phys.
> In version 1 is combo phy contain both SS and HS phys
> in a common IO space.
> In version 2 a single HS phy.
> These phys support both xHCI host driver and
> BDC Broadcom device controller driver.
> 
> Signed-off-by: Srinath Mannam <srinath.mannam@broadcom.com>
> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
> Reviewed-by: Scott Branden <scott.branden@broadcom.com>
> ---
>  drivers/phy/broadcom/Kconfig          |  11 +
>  drivers/phy/broadcom/Makefile         |   1 +
>  drivers/phy/broadcom/phy-bcm-sr-usb.c | 373 ++++++++++++++++++++++++++++++++++
>  3 files changed, 385 insertions(+)
>  create mode 100644 drivers/phy/broadcom/phy-bcm-sr-usb.c
> 
> diff --git a/drivers/phy/broadcom/Kconfig b/drivers/phy/broadcom/Kconfig
> index 8786a96..c1e4dd5 100644
> --- a/drivers/phy/broadcom/Kconfig
> +++ b/drivers/phy/broadcom/Kconfig
> @@ -10,6 +10,17 @@ config PHY_CYGNUS_PCIE
>  	  Enable this to support the Broadcom Cygnus PCIe PHY.
>  	  If unsure, say N.
>  
> +config PHY_BCM_SR_USB
> +	tristate "Broadcom Stingray USB PHY driver"
> +	depends on OF && (ARCH_BCM_IPROC || COMPILE_TEST)
> +	select GENERIC_PHY
> +	default ARCH_BCM_IPROC
> +	help
> +	  Enable this to support the Broadcom Stingray USB PHY
> +	  driver. It supports all versions of Superspeed and
> +	  Highspeed PHYs.
> +	  If unsure, say N.
> +
>  config BCM_KONA_USB2_PHY
>  	tristate "Broadcom Kona USB2 PHY Driver"
>  	depends on HAS_IOMEM
> diff --git a/drivers/phy/broadcom/Makefile b/drivers/phy/broadcom/Makefile
> index 0f60184..f453c7d 100644
> --- a/drivers/phy/broadcom/Makefile
> +++ b/drivers/phy/broadcom/Makefile
> @@ -11,3 +11,4 @@ obj-$(CONFIG_PHY_BRCM_USB)		+= phy-brcm-usb-dvr.o
>  phy-brcm-usb-dvr-objs := phy-brcm-usb.o phy-brcm-usb-init.o
>  
>  obj-$(CONFIG_PHY_BCM_SR_PCIE)		+= phy-bcm-sr-pcie.o
> +obj-$(CONFIG_PHY_BCM_SR_USB)		+= phy-bcm-sr-usb.o
> diff --git a/drivers/phy/broadcom/phy-bcm-sr-usb.c b/drivers/phy/broadcom/phy-bcm-sr-usb.c
> new file mode 100644
> index 0000000..52484b3
> --- /dev/null
> +++ b/drivers/phy/broadcom/phy-bcm-sr-usb.c
> @@ -0,0 +1,373 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (C) 2016-2018 Broadcom
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/phy/phy.h>
> +#include <linux/platform_device.h>
> +
> +enum bcm_usb_phy_version {
> +	BCM_USB_PHY_V1,
> +	BCM_USB_PHY_V2,
> +};
> +
> +enum bcm_usb_phy_reg {
> +	PLL_NDIV_FRAC,
> +	PLL_NDIV_INT,
> +	PLL_CTRL,
> +	PHY_CTRL,
> +	PHY_PLL_CTRL,
> +};
> +
> +/* USB PHY registers */
> +
> +static const u8 bcm_usb_u3phy_v1[] = {
> +	[PLL_CTRL]		= 0x18,
> +	[PHY_CTRL]		= 0x14,
> +};
> +
> +static const u8 bcm_usb_u2phy_v1[] = {
> +	[PLL_NDIV_FRAC]	= 0x04,
> +	[PLL_NDIV_INT]	= 0x08,
> +	[PLL_CTRL]	= 0x0c,
> +	[PHY_CTRL]	= 0x10,
> +};
> +
> +#define HSPLL_NDIV_INT_VAL	0x13
> +#define HSPLL_NDIV_FRAC_VAL	0x1005
> +
> +static const u8 bcm_usb_u2phy_v2[] = {
> +	[PLL_NDIV_FRAC]	= 0x0,
> +	[PLL_NDIV_INT]	= 0x4,
> +	[PLL_CTRL]	= 0x8,
> +	[PHY_CTRL]	= 0xc,
> +};
> +
> +enum pll_ctrl_bits {
> +	PLL_RESETB,
> +	SSPLL_SUSPEND_EN,
> +	PLL_SEQ_START,
> +	PLL_LOCK,
> +	PLL_PDIV,
> +};
> +
> +static const u8 u3pll_ctrl[] = {
> +	[PLL_RESETB]		= 0,
> +	[SSPLL_SUSPEND_EN]	= 1,
> +	[PLL_SEQ_START]		= 2,
> +	[PLL_LOCK]		= 3,
> +};
> +
> +#define HSPLL_PDIV_MASK		0xF
> +#define HSPLL_PDIV_VAL		0x1
> +
> +static const u8 u2pll_ctrl[] = {
> +	[PLL_PDIV]	= 1,
> +	[PLL_RESETB]	= 5,
> +	[PLL_LOCK]	= 6,
> +};
> +
> +enum bcm_usb_phy_ctrl_bits {
> +	CORERDY,
> +	AFE_LDO_PWRDWNB,
> +	AFE_PLL_PWRDWNB,
> +	AFE_BG_PWRDWNB,
> +	PHY_ISO,
> +	PHY_RESETB,
> +	PHY_PCTL,
> +};
> +
> +#define PHY_PCTL_MASK	0xffff
> +/*
> + * 0x0806 of PCTL_VAL has below bits set
> + * BIT-8 : refclk divider 1
> + * BIT-3:2: device mode; mode is not effect
> + * BIT-1: soft reset active low
> + */
> +#define HSPHY_PCTL_VAL	0x0806
> +#define SSPHY_PCTL_VAL	0x0006
> +
> +static const u8 u3phy_ctrl[] = {
> +	[PHY_RESETB]	= 1,
> +	[PHY_PCTL]	= 2,
> +};
> +
> +static const u8 u2phy_ctrl[] = {
> +	[CORERDY]		= 0,
> +	[AFE_LDO_PWRDWNB]	= 1,
> +	[AFE_PLL_PWRDWNB]	= 2,
> +	[AFE_BG_PWRDWNB]	= 3,
> +	[PHY_ISO]		= 4,
> +	[PHY_RESETB]		= 5,
> +	[PHY_PCTL]		= 6,
> +};
> +
> +struct bcm_usb_phy_cfg {
> +	uint32_t type;
> +	uint32_t ver;
> +	void __iomem *regs;
> +	struct phy *phy;
> +	const u8 *offset;
> +};
> +
> +#define PLL_LOCK_RETRY_COUNT	1000
> +
> +enum bcm_usb_phy_type {
> +	USB_HS_PHY,
> +	USB_SS_PHY,
> +};
> +
> +static inline void bcm_usb_reg32_clrbits(void __iomem *addr, uint32_t clear)
> +{
> +	writel(readl(addr) & ~clear, addr);
> +}
> +
> +static inline void bcm_usb_reg32_setbits(void __iomem *addr, uint32_t set)
> +{
> +	writel(readl(addr) | set, addr);
> +}
> +
> +static int bcm_usb_pll_lock_check(void __iomem *addr, u32 bit)
> +{
> +	int retry;
> +	u32 rd_data;
> +
> +	retry = PLL_LOCK_RETRY_COUNT;
> +	do {
> +		rd_data = readl(addr);
> +		if (rd_data & bit)
> +			return 0;
> +		udelay(1);
> +	} while (--retry > 0);
> +
> +	pr_err("%s: FAIL\n", __func__);
> +	return -ETIMEDOUT;
> +}
> +
> +static int bcm_usb_ss_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
> +{
> +	int ret = 0;
> +	void __iomem *regs = phy_cfg->regs;
> +	const u8 *offset;
> +	u32 rd_data;
> +
> +	offset = phy_cfg->offset;
> +
> +	/* Set pctl with mode and soft reset */
> +	rd_data = readl(regs + offset[PHY_CTRL]);
> +	rd_data &= ~(PHY_PCTL_MASK << u3phy_ctrl[PHY_PCTL]);
> +	rd_data |= (SSPHY_PCTL_VAL << u3phy_ctrl[PHY_PCTL]);
> +	writel(rd_data, regs + offset[PHY_CTRL]);
> +
> +	bcm_usb_reg32_clrbits(regs + offset[PLL_CTRL],
> +			      BIT(u3pll_ctrl[SSPLL_SUSPEND_EN]));
> +	bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
> +			      BIT(u3pll_ctrl[PLL_SEQ_START]));
> +	bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
> +			      BIT(u3pll_ctrl[PLL_RESETB]));
> +
> +	/* Maximum timeout for PLL reset done */
> +	msleep(30);
> +
> +	ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
> +				     BIT(u3pll_ctrl[PLL_LOCK]));
> +
> +	return ret;
> +}
> +
> +static int bcm_usb_hs_phy_init(struct bcm_usb_phy_cfg *phy_cfg)
> +{
> +	int ret = 0;
> +	void __iomem *regs = phy_cfg->regs;
> +	const u8 *offset;
> +	u32 rd_data;
> +
> +	offset = phy_cfg->offset;
> +
> +	writel(HSPLL_NDIV_INT_VAL, regs + offset[PLL_NDIV_INT]);
> +	writel(HSPLL_NDIV_FRAC_VAL, regs + offset[PLL_NDIV_FRAC]);
> +
> +	rd_data = readl(regs + offset[PLL_CTRL]);
> +	rd_data &= ~(HSPLL_PDIV_MASK << u2pll_ctrl[PLL_PDIV]);
> +	rd_data |= (HSPLL_PDIV_VAL << u2pll_ctrl[PLL_PDIV]);
> +	writel(rd_data, regs + offset[PLL_CTRL]);
> +
> +	/* Set Core Ready high */
> +	bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
> +			      BIT(u2phy_ctrl[CORERDY]));
> +
> +	/* Maximum timeout for Core Ready done */
> +	msleep(30);
> +
> +	bcm_usb_reg32_setbits(regs + offset[PLL_CTRL],
> +			      BIT(u2pll_ctrl[PLL_RESETB]));
> +	bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
> +			      BIT(u2phy_ctrl[PHY_RESETB]));
> +
> +
> +	rd_data = readl(regs + offset[PHY_CTRL]);
> +	rd_data &= ~(PHY_PCTL_MASK << u2phy_ctrl[PHY_PCTL]);
> +	rd_data |= (HSPHY_PCTL_VAL << u2phy_ctrl[PHY_PCTL]);
> +	writel(rd_data, regs + offset[PHY_CTRL]);
> +
> +	/* Maximum timeout for PLL reset done */
> +	msleep(30);
> +
> +	ret = bcm_usb_pll_lock_check(regs + offset[PLL_CTRL],
> +				     BIT(u2pll_ctrl[PLL_LOCK]));
> +
> +	return ret;
> +}
> +
> +static int bcm_usb_phy_reset(struct phy *phy)
> +{
> +	struct bcm_usb_phy_cfg *phy_cfg = phy_get_drvdata(phy);
> +	void __iomem *regs = phy_cfg->regs;
> +	const u8 *offset;
> +
> +	offset = phy_cfg->offset;
> +
> +	if (phy_cfg->type == USB_HS_PHY) {
> +		bcm_usb_reg32_clrbits(regs + offset[PHY_CTRL],
> +				      BIT(u2phy_ctrl[CORERDY]));
> +		bcm_usb_reg32_setbits(regs + offset[PHY_CTRL],
> +				      BIT(u2phy_ctrl[CORERDY]));
> +	}
> +
> +	return 0;
> +}
> +
> +static int bcm_usb_phy_init(struct phy *phy)
> +{
> +	struct bcm_usb_phy_cfg *phy_cfg = phy_get_drvdata(phy);
> +	int ret = -EINVAL;
> +
> +	if (phy_cfg->type == USB_SS_PHY)
> +		ret = bcm_usb_ss_phy_init(phy_cfg);
> +	else if (phy_cfg->type == USB_HS_PHY)
> +		ret = bcm_usb_hs_phy_init(phy_cfg);
> +
> +	return ret;
> +}
> +
> +static struct phy_ops sr_phy_ops = {
> +	.init		= bcm_usb_phy_init,
> +	.reset		= bcm_usb_phy_reset,
> +	.owner		= THIS_MODULE,
> +};
> +
> +static int bcm_usb_phy_create(struct device *dev, struct device_node *node,
> +			     void __iomem *regs, uint32_t version)
> +{
> +	struct bcm_usb_phy_cfg *phy_cfg;
> +	struct phy_provider *phy_provider;
> +
> +	phy_cfg = devm_kzalloc(dev, sizeof(struct bcm_usb_phy_cfg), GFP_KERNEL);
> +	if (!phy_cfg)
> +		return -ENOMEM;
> +
> +	phy_cfg->regs = regs;
> +	phy_cfg->ver = version;
> +
> +	if (phy_cfg->ver == BCM_USB_PHY_V1) {
> +		unsigned int id;
> +
> +		if (of_property_read_u32(node, "reg", &id)) {
> +			dev_err(dev, "missing reg property in node %s\n",
> +				node->name);
> +			return -EINVAL;
> +		}
> +
> +		if (id == 0) {
> +			phy_cfg->offset = bcm_usb_u2phy_v1;
> +			phy_cfg->type = USB_HS_PHY;
> +		} else if (id == 1) {
> +			phy_cfg->offset = bcm_usb_u3phy_v1;
> +			phy_cfg->type = USB_SS_PHY;
> +		} else {
> +			return -ENODEV;
> +		}
> +	} else if (phy_cfg->ver == BCM_USB_PHY_V2) {
> +		phy_cfg->offset = bcm_usb_u2phy_v2;
> +		phy_cfg->type = USB_HS_PHY;
> +	}
> +
> +	phy_cfg->phy = devm_phy_create(dev, node, &sr_phy_ops);
> +	if (IS_ERR(phy_cfg->phy))
> +		return PTR_ERR(phy_cfg->phy);
> +
> +	phy_set_drvdata(phy_cfg->phy, phy_cfg);
> +	phy_provider = devm_of_phy_provider_register(&phy_cfg->phy->dev,
> +						     of_phy_simple_xlate);

The phy_provider_register usage is wrong here. The device passed shouldn't be
PHY's device rather it should be PHY provider device. So
devm_of_phy_provider_register should have just used dev from the argument of
this function instead of &phy_cfg->phy->dev.

Moreover a single PHY provider can support multiple PHYs. So you can actually
move the devm_of_phy_provider_register out of this function and register the
PHY provider only once.

Remove devm_of_phy_provider_register from this function and add the following
in the probe
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
return PTR_ERR_OR_ZERO(phy_provider);

Thanks
Kishon

> +	if (IS_ERR(phy_provider)) {
> +		dev_err(dev, "Failed to register phy provider\n");
> +		return PTR_ERR(phy_provider);
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id bcm_usb_phy_of_match[] = {
> +	{
> +		.compatible = "brcm,sr-usb-phy",
> +		.data = (void *)BCM_USB_PHY_V1,
> +	},
> +	{
> +		.compatible = "brcm,sr-usb-phy-v2",
> +		.data = (void *)BCM_USB_PHY_V2,
> +	},
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, bcm_usb_phy_of_match);
> +
> +static int bcm_usb_phy_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct device_node *dn = dev->of_node, *child;
> +	const struct of_device_id *of_id;
> +	struct resource *res;
> +	void __iomem *regs;
> +	int ret;
> +	enum bcm_usb_phy_version version;
> +
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	regs = devm_ioremap_resource(dev, res);
> +	if (IS_ERR(regs))
> +		return PTR_ERR(regs);
> +
> +	of_id = of_match_node(bcm_usb_phy_of_match, dn);
> +	if (of_id)
> +		version = (enum bcm_usb_phy_version)of_id->data;
> +	else
> +		return -ENODEV;
> +
> +	if (of_get_child_count(dn) == 0)
> +		return bcm_usb_phy_create(dev, dn, regs, version);
> +
> +	for_each_available_child_of_node(dn, child) {
> +		ret = bcm_usb_phy_create(dev, child, regs, version);
> +		if (ret) {
> +			of_node_put(child);
> +			return ret;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static struct platform_driver bcm_usb_phy_driver = {
> +	.driver = {
> +		.name = "phy-bcm-sr-usb",
> +		.of_match_table = bcm_usb_phy_of_match,
> +	},
> +	.probe = bcm_usb_phy_probe,
> +};
> +module_platform_driver(bcm_usb_phy_driver);
> +
> +MODULE_AUTHOR("Broadcom");
> +MODULE_DESCRIPTION("Broadcom stingray USB Phy driver");
> +MODULE_LICENSE("GPL v2");
>