[PATCH V2 0/9] Bug fixes and improvements to Broadcom BDC driver

[PATCH V2 0/9] Bug fixes and improvements to Broadcom BDC driver

[Al Cooper]

V2 Changes:
- Add support for USB phys. We need to handle systems with either
  a single phy or systems with both a USB2.0 and USB3.0 phy
- Fixes to the dt-bindings document based on feedback from 
  Rob Herring. Changes include changing the compatible base
  name to "brcm,bdc" because "brcm,bdc-udc" seemed redundant
- Add proper suspend/resume support with clock control
- Split out code cleanup into separate patch

Bug fixes and improvements to the Broadcom USB STB BDC driver.

Al Cooper (8):
  usb: bdc: Fix misleading register names
  dt-bindings: usb: bdc: Add Device Tree binding for Broadcom UDC driver
  usb: bdc: Add clock enable for new chips with a separate BDC clock
  usb: bdc: Small code cleanup
  usb: bdc: Add support for suspend/resume
  usb: bdc: fix "xsf for ep not enabled" errror
  usb: bdc: Enable in Kconfig for ARCH_BRCMSTB systems
  usb: bdc: Add support for USB phy

Florian Fainelli (1):
  usb: bdc: hook a quick Device Tree compatible string

 Documentation/devicetree/bindings/usb/brcm,bdc.txt |  29 ++++
 drivers/usb/gadget/udc/bdc/Kconfig                 |   1 +
 drivers/usb/gadget/udc/bdc/bdc.h                   |  24 ++--
 drivers/usb/gadget/udc/bdc/bdc_core.c              | 148 +++++++++++++++++++--
 drivers/usb/gadget/udc/bdc/bdc_dbg.c               |  16 +--
 drivers/usb/gadget/udc/bdc/bdc_ep.c                |   4 +-
 drivers/usb/gadget/udc/bdc/bdc_udc.c               |   7 +-
 7 files changed, 197 insertions(+), 32 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/usb/brcm,bdc.txt

-- 
1.9.0.138.g2de3478

[PATCH V2 1/9] usb: bdc: Fix misleading register names

[Al Cooper]

The BDC endpoint status registers 0-7 were originally each going
to be an array of regsiters. This was later changed to being a
single register. The register definitions are being changed from:
"#define BDC_EPSTS0(n)  (0x60 + (n * 0x10))"
to
"#define BDC_EPSTS0	0x60"
to reflect this change and to avoid future coding mistakes.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
 drivers/usb/gadget/udc/bdc/bdc.h     | 16 ++++++++--------
 drivers/usb/gadget/udc/bdc/bdc_dbg.c | 16 ++++++++--------
 drivers/usb/gadget/udc/bdc/bdc_ep.c  |  4 ++--
 3 files changed, 18 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/gadget/udc/bdc/bdc.h b/drivers/usb/gadget/udc/bdc/bdc.h
index 916d471..3664808 100644
--- a/drivers/usb/gadget/udc/bdc/bdc.h
+++ b/drivers/usb/gadget/udc/bdc/bdc.h
@@ -83,14 +83,14 @@
 
 #define BDC_DVCSA	0x50
 #define BDC_DVCSB	0x54
-#define BDC_EPSTS0(n)	(0x60 + (n * 0x10))
-#define BDC_EPSTS1(n)	(0x64 + (n * 0x10))
-#define BDC_EPSTS2(n)	(0x68 + (n * 0x10))
-#define BDC_EPSTS3(n)	(0x6c + (n * 0x10))
-#define BDC_EPSTS4(n)	(0x70 + (n * 0x10))
-#define BDC_EPSTS5(n)	(0x74 + (n * 0x10))
-#define BDC_EPSTS6(n)	(0x78 + (n * 0x10))
-#define BDC_EPSTS7(n)	(0x7c + (n * 0x10))
+#define BDC_EPSTS0	0x60
+#define BDC_EPSTS1	0x64
+#define BDC_EPSTS2	0x68
+#define BDC_EPSTS3	0x6c
+#define BDC_EPSTS4	0x70
+#define BDC_EPSTS5	0x74
+#define BDC_EPSTS6	0x78
+#define BDC_EPSTS7	0x7c
 #define BDC_SRRBAL(n)	(0x200 + (n * 0x10))
 #define BDC_SRRBAH(n)	(0x204 + (n * 0x10))
 #define BDC_SRRINT(n)	(0x208 + (n * 0x10))
diff --git a/drivers/usb/gadget/udc/bdc/bdc_dbg.c b/drivers/usb/gadget/udc/bdc/bdc_dbg.c
index 5945dbc..ac98f6f 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_dbg.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_dbg.c
@@ -40,28 +40,28 @@ void bdc_dump_epsts(struct bdc *bdc)
 {
 	u32 temp;
 
-	temp = bdc_readl(bdc->regs, BDC_EPSTS0(0));
+	temp = bdc_readl(bdc->regs, BDC_EPSTS0);
 	dev_vdbg(bdc->dev, "BDC_EPSTS0:0x%08x\n", temp);
 
-	temp = bdc_readl(bdc->regs, BDC_EPSTS1(0));
+	temp = bdc_readl(bdc->regs, BDC_EPSTS1);
 	dev_vdbg(bdc->dev, "BDC_EPSTS1:0x%x\n", temp);
 
-	temp = bdc_readl(bdc->regs, BDC_EPSTS2(0));
+	temp = bdc_readl(bdc->regs, BDC_EPSTS2);
 	dev_vdbg(bdc->dev, "BDC_EPSTS2:0x%08x\n", temp);
 
-	temp = bdc_readl(bdc->regs, BDC_EPSTS3(0));
+	temp = bdc_readl(bdc->regs, BDC_EPSTS3);
 	dev_vdbg(bdc->dev, "BDC_EPSTS3:0x%08x\n", temp);
 
-	temp = bdc_readl(bdc->regs, BDC_EPSTS4(0));
+	temp = bdc_readl(bdc->regs, BDC_EPSTS4);
 	dev_vdbg(bdc->dev, "BDC_EPSTS4:0x%08x\n", temp);
 
-	temp = bdc_readl(bdc->regs, BDC_EPSTS5(0));
+	temp = bdc_readl(bdc->regs, BDC_EPSTS5);
 	dev_vdbg(bdc->dev, "BDC_EPSTS5:0x%08x\n", temp);
 
-	temp = bdc_readl(bdc->regs, BDC_EPSTS6(0));
+	temp = bdc_readl(bdc->regs, BDC_EPSTS6);
 	dev_vdbg(bdc->dev, "BDC_EPSTS6:0x%08x\n", temp);
 
-	temp = bdc_readl(bdc->regs, BDC_EPSTS7(0));
+	temp = bdc_readl(bdc->regs, BDC_EPSTS7);
 	dev_vdbg(bdc->dev, "BDC_EPSTS7:0x%08x\n", temp);
 }
 
diff --git a/drivers/usb/gadget/udc/bdc/bdc_ep.c b/drivers/usb/gadget/udc/bdc/bdc_ep.c
index ff1ef24..bfd8f7a 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_ep.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_ep.c
@@ -777,9 +777,9 @@ static int ep_dequeue(struct bdc_ep *ep, struct bdc_req *req)
 	 */
 
 	/* The current hw dequeue pointer */
-	tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS0(0));
+	tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS0);
 	deq_ptr_64 = tmp_32;
-	tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS1(0));
+	tmp_32 = bdc_readl(bdc->regs, BDC_EPSTS1);
 	deq_ptr_64 |= ((u64)tmp_32 << 32);
 
 	/* we have the dma addr of next bd that will be fetched by hardware */
-- 
1.9.0.138.g2de3478

[PATCH V2 2/9] dt-bindings: usb: bdc: Add Device Tree binding for Broadcom UDC driver

[Al Cooper]

Add Device Tree binding document for Broadcom USB Device
Controller (BDC).

Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
 Documentation/devicetree/bindings/usb/brcm,bdc.txt | 29 ++++++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/brcm,bdc.txt

diff --git a/Documentation/devicetree/bindings/usb/brcm,bdc.txt b/Documentation/devicetree/bindings/usb/brcm,bdc.txt
new file mode 100644
index 0000000..63e63af
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/brcm,bdc.txt
@@ -0,0 +1,29 @@
+Broadcom USB Device Controller (BDC)
+====================================
+
+Required properties:
+
+- compatible: must be one of:
+                "brcm,bdc-v0.16"
+                "brcm,bdc"
+- reg: the base register address and length
+- interrupts: the interrupt line for this controller
+
+Optional properties:
+
+On Broadcom STB platforms, these properties are required:
+
+- phys: phandle to one or two USB PHY blocks
+        NOTE: Some SoC's have a single phy and some have
+        USB 2.0 and USB 3.0 phys
+- clocks: phandle to the functional clock of this block
+
+Example:
+
+        bdc@f0b02000 {
+                compatible = "brcm,bdc-v0.16";
+                reg = <0xf0b02000 0xfc4>;
+                interrupts = <0x0 0x60 0x0>;
+                phys = <&usbphy_0 0x0>;
+                clocks = <&sw_usbd>;
+        };
-- 
1.9.0.138.g2de3478

Re: [PATCH V2 2/9] dt-bindings: usb: bdc: Add Device Tree binding for Broadcom UDC driver

[Rob Herring]

On Wed, Jul 19, 2017 at 03:11:41PM -0400, Al Cooper wrote:
> Add Device Tree binding document for Broadcom USB Device
> Controller (BDC).
> 
> Signed-off-by: Al Cooper <alcooperx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
>  Documentation/devicetree/bindings/usb/brcm,bdc.txt | 29 ++++++++++++++++++++++
>  1 file changed, 29 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/brcm,bdc.txt

Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
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[PATCH V2 3/9] usb: bdc: Add clock enable for new chips with a separate BDC clock

[Al Cooper]

Newer SoC's have added a BDC clock to the Device Tree, so get
and enable it.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
 drivers/usb/gadget/udc/bdc/bdc_core.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c
index e9bd8d4..dda7b43 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_core.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_core.c
@@ -27,6 +27,7 @@
 #include <linux/moduleparam.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
+#include <linux/clk.h>
 
 #include "bdc.h"
 #include "bdc_dbg.h"
@@ -452,8 +453,22 @@ static int bdc_probe(struct platform_device *pdev)
 	int irq;
 	u32 temp;
 	struct device *dev = &pdev->dev;
+	struct clk *clk;
 
 	dev_dbg(dev, "%s()\n", __func__);
+
+	clk = devm_clk_get(dev, "sw_usbd");
+	if (IS_ERR(clk)) {
+		dev_info(dev, "Clock not found in Device Tree\n");
+		clk = NULL;
+	}
+
+	ret = clk_prepare_enable(clk);
+	if (ret) {
+		dev_err(dev, "could not enable clock\n");
+		return ret;
+	}
+
 	bdc = devm_kzalloc(dev, sizeof(*bdc), GFP_KERNEL);
 	if (!bdc)
 		return -ENOMEM;
-- 
1.9.0.138.g2de3478

[PATCH V2 4/9] usb: bdc: Small code cleanup

[Al Cooper]

Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
 drivers/usb/gadget/udc/bdc/bdc_core.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c
index dda7b43..c2bfae2 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_core.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_core.c
@@ -488,28 +488,29 @@ static int bdc_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, bdc);
 	bdc->irq = irq;
 	bdc->dev = dev;
-	dev_dbg(bdc->dev, "bdc->regs: %p irq=%d\n", bdc->regs, bdc->irq);
+	dev_dbg(dev, "bdc->regs: %p irq=%d\n", bdc->regs, bdc->irq);
 
 	temp = bdc_readl(bdc->regs, BDC_BDCCAP1);
 	if ((temp & BDC_P64) &&
 			!dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64))) {
-		dev_dbg(bdc->dev, "Using 64-bit address\n");
+		dev_dbg(dev, "Using 64-bit address\n");
 	} else {
-		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+		ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
 		if (ret) {
-			dev_err(bdc->dev, "No suitable DMA config available, abort\n");
+			dev_err(dev,
+				"No suitable DMA config available, abort\n");
 			return -ENOTSUPP;
 		}
-		dev_dbg(bdc->dev, "Using 32-bit address\n");
+		dev_dbg(dev, "Using 32-bit address\n");
 	}
 	ret = bdc_hw_init(bdc);
 	if (ret) {
-		dev_err(bdc->dev, "BDC init failure:%d\n", ret);
+		dev_err(dev, "BDC init failure:%d\n", ret);
 		return ret;
 	}
 	ret = bdc_udc_init(bdc);
 	if (ret) {
-		dev_err(bdc->dev, "BDC Gadget init failure:%d\n", ret);
+		dev_err(dev, "BDC Gadget init failure:%d\n", ret);
 		goto cleanup;
 	}
 	return 0;
-- 
1.9.0.138.g2de3478

[PATCH V2 5/9] usb: bdc: hook a quick Device Tree compatible string

[Al Cooper]

From: Florian Fainelli <f.fainelli@gmail.com>

Allows Device Tree probing

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
 drivers/usb/gadget/udc/bdc/bdc.h      | 4 ++--
 drivers/usb/gadget/udc/bdc/bdc_core.c | 8 ++++++++
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/bdc/bdc.h b/drivers/usb/gadget/udc/bdc/bdc.h
index 3664808..f657a4e 100644
--- a/drivers/usb/gadget/udc/bdc/bdc.h
+++ b/drivers/usb/gadget/udc/bdc/bdc.h
@@ -27,8 +27,8 @@
 #include <linux/usb/gadget.h>
 #include <asm/unaligned.h>
 
-#define BRCM_BDC_NAME "bdc_usb3"
-#define BRCM_BDC_DESC "BDC device controller driver"
+#define BRCM_BDC_NAME "bdc"
+#define BRCM_BDC_DESC "Broadcom USB Device Controller driver"
 
 #define DMA_ADDR_INVALID        (~(dma_addr_t)0)
 
diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c
index c2bfae2..bc0729b 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_core.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_core.c
@@ -533,9 +533,17 @@ static int bdc_remove(struct platform_device *pdev)
 	return 0;
 }
 
+static const struct of_device_id bdc_of_match[] = {
+	{ .compatible = "brcm,bdc-v0.16" },
+	{ .compatible = "brcm,bdc" },
+	{ /* sentinel */ }
+};
+
 static struct platform_driver bdc_driver = {
 	.driver		= {
 		.name	= BRCM_BDC_NAME,
+		.owner	= THIS_MODULE,
+		.of_match_table	= bdc_of_match,
 	},
 	.probe		= bdc_probe,
 	.remove		= bdc_remove,
-- 
1.9.0.138.g2de3478

[PATCH V2 6/9] usb: bdc: Add support for suspend/resume

[Al Cooper]

Based on a previous commit by Danesh Petigara <dpetigara-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
that added resume to solve the following problem:
"The BDC driver will fail after resuming from S3 suspend and this
will cause any upper layer gadget driver to fail."
This commit also adds support for suspend and manages the clock during
suspend/resume.

Signed-off-by: Al Cooper <alcooperx-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/usb/gadget/udc/bdc/bdc.h      |  1 +
 drivers/usb/gadget/udc/bdc/bdc_core.c | 36 +++++++++++++++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/drivers/usb/gadget/udc/bdc/bdc.h b/drivers/usb/gadget/udc/bdc/bdc.h
index f657a4e..67c5f23 100644
--- a/drivers/usb/gadget/udc/bdc/bdc.h
+++ b/drivers/usb/gadget/udc/bdc/bdc.h
@@ -454,6 +454,7 @@ struct bdc {
 	 * Func Wake packet every 2.5 secs. Refer to USB3 spec section 8.5.6.4
 	 */
 	struct delayed_work	func_wake_notify;
+	struct clk		*clk;
 };
 
 static inline u32 bdc_readl(void __iomem *base, u32 offset)
diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c
index bc0729b..2690b6f 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_core.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_core.c
@@ -473,6 +473,8 @@ static int bdc_probe(struct platform_device *pdev)
 	if (!bdc)
 		return -ENOMEM;
 
+	bdc->clk = clk;
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	bdc->regs = devm_ioremap_resource(dev, res);
 	if (IS_ERR(bdc->regs)) {
@@ -529,10 +531,43 @@ static int bdc_remove(struct platform_device *pdev)
 	dev_dbg(bdc->dev, "%s ()\n", __func__);
 	bdc_udc_exit(bdc);
 	bdc_hw_exit(bdc);
+	clk_disable_unprepare(bdc->clk);
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int bdc_suspend(struct device *dev)
+{
+	struct bdc *bdc = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(bdc->clk);
+	return 0;
+}
+
+static int bdc_resume(struct device *dev)
+{
+	struct bdc *bdc = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(bdc->clk);
+	if (ret) {
+		dev_err(bdc->dev, "err enabling the clock\n");
+		return ret;
+	}
+	ret = bdc_reinit(bdc);
+	if (ret) {
+		dev_err(bdc->dev, "err in bdc reinit\n");
+		return ret;
+	}
 
 	return 0;
 }
 
+#endif /* CONFIG_PM_SLEEP */
+
+static SIMPLE_DEV_PM_OPS(bdc_pm_ops, bdc_suspend,
+		bdc_resume);
+
 static const struct of_device_id bdc_of_match[] = {
 	{ .compatible = "brcm,bdc-v0.16" },
 	{ .compatible = "brcm,bdc" },
@@ -543,6 +578,7 @@ static int bdc_remove(struct platform_device *pdev)
 	.driver		= {
 		.name	= BRCM_BDC_NAME,
 		.owner	= THIS_MODULE,
+		.pm = &bdc_pm_ops,
 		.of_match_table	= bdc_of_match,
 	},
 	.probe		= bdc_probe,
-- 
1.9.0.138.g2de3478

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[PATCH V2 7/9] usb: bdc: fix "xsf for ep not enabled" errror

[Al Cooper]

This patch essentially clears the port status change bits at the
correct times. It is necessary because the driver was not handling
the change bits correctly for events during device
connection/disconnection and bus enumeration. So, one of them (PCC)
was left stuck sometimes causing the "xsf for ep not enabled"
error we get on first connection. This was found by the Android team.
This was debugged and fixed by Sasi Kumar.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
 drivers/usb/gadget/udc/bdc/bdc_udc.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/gadget/udc/bdc/bdc_udc.c b/drivers/usb/gadget/udc/bdc/bdc_udc.c
index aae7458..c843461 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_udc.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_udc.c
@@ -249,6 +249,7 @@ void bdc_sr_uspc(struct bdc *bdc, struct bdc_sr *sreport)
 			disconn = true;
 		else if ((uspc & BDC_PCS) && !BDC_PST(uspc))
 			connected = true;
+		clear_flags |= BDC_PCC;
 	}
 
 	/* Change in VBus and VBus is present */
@@ -259,16 +260,16 @@ void bdc_sr_uspc(struct bdc *bdc, struct bdc_sr *sreport)
 			bdc_softconn(bdc);
 			usb_gadget_set_state(&bdc->gadget, USB_STATE_POWERED);
 		}
-		clear_flags = BDC_VBC;
+		clear_flags |= BDC_VBC;
 	} else if ((uspc & BDC_PRS) || (uspc & BDC_PRC) || disconn) {
 		/* Hot reset, warm reset, 2.0 bus reset or disconn */
 		dev_dbg(bdc->dev, "Port reset or disconn\n");
 		bdc_uspc_disconnected(bdc, disconn);
-		clear_flags = BDC_PCC|BDC_PCS|BDC_PRS|BDC_PRC;
+		clear_flags |= BDC_PRC;
 	} else if ((uspc & BDC_PSC) && (uspc & BDC_PCS)) {
 		/* Change in Link state */
 		handle_link_state_change(bdc, uspc);
-		clear_flags = BDC_PSC|BDC_PCS;
+		clear_flags |= BDC_PSC;
 	}
 
 	/*
-- 
1.9.0.138.g2de3478

[PATCH V2 8/9] usb: bdc: Enable in Kconfig for ARCH_BRCMSTB systems

[Al Cooper]

Many ARM based Broadcom STB SoC's have a USB BDC controller so
enable this driver for these systems.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
 drivers/usb/gadget/udc/bdc/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/gadget/udc/bdc/Kconfig b/drivers/usb/gadget/udc/bdc/Kconfig
index eb8b553..c74ac25 100644
--- a/drivers/usb/gadget/udc/bdc/Kconfig
+++ b/drivers/usb/gadget/udc/bdc/Kconfig
@@ -1,6 +1,7 @@
 config USB_BDC_UDC
 	tristate "Broadcom USB3.0 device controller IP driver(BDC)"
 	depends on USB_GADGET && HAS_DMA
+	default ARCH_BRCMSTB
 
 	help
 	BDC is Broadcom's USB3.0 device controller IP. If your SOC has a BDC IP
-- 
1.9.0.138.g2de3478

[PATCH V2 9/9] usb: bdc: Add support for USB phy

[Al Cooper]

If a phy is specified in the device tree node, get it and use it.
This was based on a patch by:
"Srinath Mannam <srinath.mannam@broadcom.com>"

Signed-off-by: Al Cooper <alcooperx@gmail.com>
---
 drivers/usb/gadget/udc/bdc/bdc.h      |  3 ++
 drivers/usb/gadget/udc/bdc/bdc_core.c | 74 ++++++++++++++++++++++++++++++++++-
 2 files changed, 75 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/gadget/udc/bdc/bdc.h b/drivers/usb/gadget/udc/bdc/bdc.h
index 67c5f23..6df0352 100644
--- a/drivers/usb/gadget/udc/bdc/bdc.h
+++ b/drivers/usb/gadget/udc/bdc/bdc.h
@@ -413,6 +413,9 @@ struct bdc {
 	/* device lock */
 	spinlock_t	lock;
 
+	/* generic phy */
+	struct phy      **phys;
+	int num_phys;
 	/* num of endpoints for a particular instantiation of IP */
 	unsigned int num_eps;
 	/*
diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c
index 2690b6f..7a8af4b 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_core.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_core.c
@@ -24,6 +24,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/dmapool.h>
 #include <linux/of.h>
+#include <linux/phy/phy.h>
 #include <linux/moduleparam.h>
 #include <linux/usb/ch9.h>
 #include <linux/usb/gadget.h>
@@ -445,6 +446,43 @@ static int bdc_hw_init(struct bdc *bdc)
 	return 0;
 }
 
+static int bdc_phy_init(struct bdc *bdc)
+{
+	int phy_num;
+	int ret;
+
+	for (phy_num = 0; phy_num < bdc->num_phys; phy_num++) {
+		ret = phy_init(bdc->phys[phy_num]);
+		if (ret)
+			goto err_exit_phy;
+		ret = phy_power_on(bdc->phys[phy_num]);
+		if (ret) {
+			phy_exit(bdc->phys[phy_num]);
+			goto err_exit_phy;
+		}
+	}
+
+	return 0;
+
+err_exit_phy:
+	while (--phy_num >= 0) {
+		phy_power_off(bdc->phys[phy_num]);
+		phy_exit(bdc->phys[phy_num]);
+	}
+
+	return ret;
+}
+
+static void bdc_phy_exit(struct bdc *bdc)
+{
+	int phy_num;
+
+	for (phy_num = 0; phy_num < bdc->num_phys; phy_num++) {
+		phy_power_off(bdc->phys[phy_num]);
+		phy_exit(bdc->phys[phy_num]);
+	}
+}
+
 static int bdc_probe(struct platform_device *pdev)
 {
 	struct bdc *bdc;
@@ -454,6 +492,7 @@ static int bdc_probe(struct platform_device *pdev)
 	u32 temp;
 	struct device *dev = &pdev->dev;
 	struct clk *clk;
+	int phy_num;
 
 	dev_dbg(dev, "%s()\n", __func__);
 
@@ -492,6 +531,35 @@ static int bdc_probe(struct platform_device *pdev)
 	bdc->dev = dev;
 	dev_dbg(dev, "bdc->regs: %p irq=%d\n", bdc->regs, bdc->irq);
 
+	bdc->num_phys = of_count_phandle_with_args(dev->of_node,
+						"phys", "#phy-cells");
+	if (bdc->num_phys > 0) {
+		bdc->phys = devm_kcalloc(dev, bdc->num_phys,
+					sizeof(struct phy *), GFP_KERNEL);
+		if (!bdc->phys)
+			return -ENOMEM;
+	} else {
+		bdc->num_phys = 0;
+	}
+	dev_info(dev, "Using %d phy(s)\n", bdc->num_phys);
+
+	for (phy_num = 0; phy_num < bdc->num_phys; phy_num++) {
+		bdc->phys[phy_num] = devm_of_phy_get_by_index(
+			dev, dev->of_node, phy_num);
+		if (IS_ERR(bdc->phys[phy_num])) {
+			ret = PTR_ERR(bdc->phys[phy_num]);
+			dev_err(bdc->dev,
+				"BDC phy specified but not found:%d\n", ret);
+			return ret;
+		}
+	}
+
+	ret = bdc_phy_init(bdc);
+	if (ret) {
+		dev_err(bdc->dev, "BDC phy init failure:%d\n", ret);
+		return ret;
+	}
+
 	temp = bdc_readl(bdc->regs, BDC_BDCCAP1);
 	if ((temp & BDC_P64) &&
 			!dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64))) {
@@ -508,7 +576,7 @@ static int bdc_probe(struct platform_device *pdev)
 	ret = bdc_hw_init(bdc);
 	if (ret) {
 		dev_err(dev, "BDC init failure:%d\n", ret);
-		return ret;
+		goto phycleanup;
 	}
 	ret = bdc_udc_init(bdc);
 	if (ret) {
@@ -519,7 +587,8 @@ static int bdc_probe(struct platform_device *pdev)
 
 cleanup:
 	bdc_hw_exit(bdc);
-
+phycleanup:
+	bdc_phy_exit(bdc);
 	return ret;
 }
 
@@ -531,6 +600,7 @@ static int bdc_remove(struct platform_device *pdev)
 	dev_dbg(bdc->dev, "%s ()\n", __func__);
 	bdc_udc_exit(bdc);
 	bdc_hw_exit(bdc);
+	bdc_phy_exit(bdc);
 	clk_disable_unprepare(bdc->clk);
 	return 0;
 }
-- 
1.9.0.138.g2de3478