[PATCH v7 0/4] da8xx USB PHY platform devices and clocks

[PATCH v7 0/4] da8xx USB PHY platform devices and clocks

[David Lechner]

This series depends on [v3] ARM: davinci: da8xx: Fix some redefined symbol
warnings <https://patchwork.kernel.org/patch/9397005/> being applied first.

v7 changes:
* Dropped patches that have been accepted into linux-davinci already
* New patch for adding device names to clock lookup tables
* Picked up related patch from Axel Haslam for registering USB PHY clocks on
  device tree boards and added error checking to to that patch
* Rebased on latest linux-davinci + linux-next
* Added devices instead of NULL in clk_get() where appropriate usb-da8xx.c
* Re-ordered patches so that they apply/build cleanly

v6 changes:

* Combine "ARM: davinci: da8xx: Enable the usb20 "per" clk on phy_clk_enable"
  from the "[PATCH/RFT v2 00/17] Add DT support for ohci-da8xx" series with
  the "ARM: davinci: da8xx: add usb phy clocks" patch in this series.
* Change the syscon and da8xx-usb-phy device ids to -1.

v5 changes: renamed "usbphy" to "usb_phy" or "usb-phy" as appropriate

v4 changes: fix strict checkpatch complaint

v3 changes:

* Fixed the davinci device tree declarations to use the preferred DT address
  convention so that the items I have added can be correct too.
* Moved that davinci clock init so that we don't have to call ioremap in the
  clock mux functions.
* Added a new "syscon" device for the CFGCHIP registers. This is used by the
  USB PHY driver and will be used in the future in common clock framework
  drivers.
* USB clocks are moved to a common file instead of having duplicated code.
* PHY driver uses syscon for CFGCHIP registers instead of using them directly.

Axel Haslam (1):
  ARM: davinci: da8xx: register USB PHY clocks in the DT file

David Lechner (3):
  ARM: davinci: da8xx: Add USB PHY platform declaration
  ARM: davinci: da8xx: Add USB device names to clock lookup tables
  ARM: davinci: da8xx: add usb phy clocks

 arch/arm/mach-davinci/board-da830-evm.c     |  49 ++---
 arch/arm/mach-davinci/board-omapl138-hawk.c |  20 ++-
 arch/arm/mach-davinci/da830.c               |   4 +-
 arch/arm/mach-davinci/da850.c               |   4 +-
 arch/arm/mach-davinci/da8xx-dt.c            |  14 ++
 arch/arm/mach-davinci/include/mach/da8xx.h  |   4 +
 arch/arm/mach-davinci/usb-da8xx.c           | 270 ++++++++++++++++++++++++++--
 7 files changed, 307 insertions(+), 58 deletions(-)

-- 
2.7.4

[PATCH v7 0/4] da8xx USB PHY platform devices and clocks

[David Lechner]

This series depends on [v3] ARM: davinci: da8xx: Fix some redefined symbol
warnings <https://patchwork.kernel.org/patch/9397005/> being applied first.

v7 changes:
* Dropped patches that have been accepted into linux-davinci already
* New patch for adding device names to clock lookup tables
* Picked up related patch from Axel Haslam for registering USB PHY clocks on
  device tree boards and added error checking to to that patch
* Rebased on latest linux-davinci + linux-next
* Added devices instead of NULL in clk_get() where appropriate usb-da8xx.c
* Re-ordered patches so that they apply/build cleanly

v6 changes:

* Combine "ARM: davinci: da8xx: Enable the usb20 "per" clk on phy_clk_enable"
  from the "[PATCH/RFT v2 00/17] Add DT support for ohci-da8xx" series with
  the "ARM: davinci: da8xx: add usb phy clocks" patch in this series.
* Change the syscon and da8xx-usb-phy device ids to -1.

v5 changes: renamed "usbphy" to "usb_phy" or "usb-phy" as appropriate

v4 changes: fix strict checkpatch complaint

v3 changes:

* Fixed the davinci device tree declarations to use the preferred DT address
  convention so that the items I have added can be correct too.
* Moved that davinci clock init so that we don't have to call ioremap in the
  clock mux functions.
* Added a new "syscon" device for the CFGCHIP registers. This is used by the
  USB PHY driver and will be used in the future in common clock framework
  drivers.
* USB clocks are moved to a common file instead of having duplicated code.
* PHY driver uses syscon for CFGCHIP registers instead of using them directly.

Axel Haslam (1):
  ARM: davinci: da8xx: register USB PHY clocks in the DT file

David Lechner (3):
  ARM: davinci: da8xx: Add USB PHY platform declaration
  ARM: davinci: da8xx: Add USB device names to clock lookup tables
  ARM: davinci: da8xx: add usb phy clocks

 arch/arm/mach-davinci/board-da830-evm.c     |  49 ++---
 arch/arm/mach-davinci/board-omapl138-hawk.c |  20 ++-
 arch/arm/mach-davinci/da830.c               |   4 +-
 arch/arm/mach-davinci/da850.c               |   4 +-
 arch/arm/mach-davinci/da8xx-dt.c            |  14 ++
 arch/arm/mach-davinci/include/mach/da8xx.h  |   4 +
 arch/arm/mach-davinci/usb-da8xx.c           | 270 ++++++++++++++++++++++++++--
 7 files changed, 307 insertions(+), 58 deletions(-)

-- 
2.7.4

[PATCH v7 1/4] ARM: davinci: da8xx: Add USB PHY platform declaration

[David Lechner]

There is now a proper phy driver for the DA8xx SoC USB PHY. This adds the
platform device declarations needed to use it.

Signed-off-by: David Lechner <david@lechnology.com>
---

Updated this patch so that it applies/builds cleanly before "ARM: davinci:
da8xx: add usb phy clocks" since that patch now uses da8xx_usb_phy from this
patch.


 arch/arm/mach-davinci/board-da830-evm.c     | 22 +++++++---------------
 arch/arm/mach-davinci/board-omapl138-hawk.c |  5 +++++
 arch/arm/mach-davinci/include/mach/da8xx.h  |  1 +
 arch/arm/mach-davinci/usb-da8xx.c           | 11 +++++++++++
 4 files changed, 24 insertions(+), 15 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index 2a96b40..829f68d 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -26,7 +26,6 @@
 #include <linux/platform_data/mtd-davinci.h>
 #include <linux/platform_data/mtd-davinci-aemif.h>
 #include <linux/platform_data/spi-davinci.h>
-#include <linux/platform_data/usb-davinci.h>
 #include <linux/mfd/da8xx-cfgchip.h>
 
 #include <asm/mach-types.h>
@@ -111,7 +110,7 @@ static __init void da830_evm_usb_init(void)
 	int ret;
 
 	/*
-	 * Set up USB clock/mode in the CFGCHIP2 register.
+	 * Set up USB clock in the CFGCHIP2 register.
 	 * FYI:  CFGCHIP2 is 0x0000ef00 initially.
 	 */
 	cfgchip2 = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
@@ -128,22 +127,15 @@ static __init void da830_evm_usb_init(void)
 	cfgchip2 &= ~CFGCHIP2_USB1PHYCLKMUX;
 	cfgchip2 |=  CFGCHIP2_USB2PHYCLKMUX;
 
-	/*
-	 * We have to override VBUS/ID signals when MUSB is configured into the
-	 * host-only mode -- ID pin will float if no cable is connected, so the
-	 * controller won't be able to drive VBUS thinking that it's a B-device.
-	 * Otherwise, we want to use the OTG mode and enable VBUS comparators.
-	 */
-	cfgchip2 &= ~CFGCHIP2_OTGMODE;
-#ifdef	CONFIG_USB_MUSB_HOST
-	cfgchip2 |=  CFGCHIP2_FORCE_HOST;
-#else
-	cfgchip2 |=  CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN;
-#endif
-
 	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
 
 	/* USB_REFCLKIN is not used. */
+
+	ret = da8xx_register_usb_phy();
+	if (ret)
+		pr_warn("%s: USB PHY registration failed: %d\n",
+			__func__, ret);
+
 	ret = davinci_cfg_reg(DA830_USB0_DRVVBUS);
 	if (ret)
 		pr_warn("%s: USB 2.0 PinMux setup failed: %d\n", __func__, ret);
diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
index 70ebbba..0fd2ef1 100644
--- a/arch/arm/mach-davinci/board-omapl138-hawk.c
+++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
@@ -259,6 +259,11 @@ static __init void omapl138_hawk_usb_init(void)
 	cfgchip2 |=  CFGCHIP2_REFFREQ_24MHZ;
 	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
 
+	ret = da8xx_register_usb_phy();
+	if (ret)
+		pr_warn("%s: USB PHY registration failed: %d\n",
+			__func__, ret);
+
 	ret = gpio_request_one(DA850_USB1_VBUS_PIN,
 			GPIOF_DIR_OUT, "USB1 VBUS");
 	if (ret < 0) {
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index 2f6fe2f0..5e07d06 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -89,6 +89,7 @@ int da850_register_edma(struct edma_rsv_info *rsv[2]);
 int da8xx_register_i2c(int instance, struct davinci_i2c_platform_data *pdata);
 int da8xx_register_spi_bus(int instance, unsigned num_chipselect);
 int da8xx_register_watchdog(void);
+int da8xx_register_usb_phy(void);
 int da8xx_register_usb20(unsigned mA, unsigned potpgt);
 int da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata);
 int da8xx_register_emac(void);
diff --git a/arch/arm/mach-davinci/usb-da8xx.c b/arch/arm/mach-davinci/usb-da8xx.c
index f141f51..4bb1903 100644
--- a/arch/arm/mach-davinci/usb-da8xx.c
+++ b/arch/arm/mach-davinci/usb-da8xx.c
@@ -3,6 +3,7 @@
  */
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
+#include <linux/phy/phy.h>
 #include <linux/platform_data/usb-davinci.h>
 #include <linux/platform_device.h>
 #include <linux/usb/musb.h>
@@ -15,6 +16,16 @@
 #define DA8XX_USB0_BASE		0x01e00000
 #define DA8XX_USB1_BASE		0x01e25000
 
+static struct platform_device da8xx_usb_phy = {
+	.name		= "da8xx-usb-phy",
+	.id		= -1,
+};
+
+int __init da8xx_register_usb_phy(void)
+{
+	return platform_device_register(&da8xx_usb_phy);
+}
+
 #if IS_ENABLED(CONFIG_USB_MUSB_HDRC)
 
 static struct musb_hdrc_config musb_config = {
-- 
2.7.4

[PATCH v7 1/4] ARM: davinci: da8xx: Add USB PHY platform declaration

[David Lechner]

There is now a proper phy driver for the DA8xx SoC USB PHY. This adds the
platform device declarations needed to use it.

Signed-off-by: David Lechner <david@lechnology.com>
---

Updated this patch so that it applies/builds cleanly before "ARM: davinci:
da8xx: add usb phy clocks" since that patch now uses da8xx_usb_phy from this
patch.


 arch/arm/mach-davinci/board-da830-evm.c     | 22 +++++++---------------
 arch/arm/mach-davinci/board-omapl138-hawk.c |  5 +++++
 arch/arm/mach-davinci/include/mach/da8xx.h  |  1 +
 arch/arm/mach-davinci/usb-da8xx.c           | 11 +++++++++++
 4 files changed, 24 insertions(+), 15 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index 2a96b40..829f68d 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -26,7 +26,6 @@
 #include <linux/platform_data/mtd-davinci.h>
 #include <linux/platform_data/mtd-davinci-aemif.h>
 #include <linux/platform_data/spi-davinci.h>
-#include <linux/platform_data/usb-davinci.h>
 #include <linux/mfd/da8xx-cfgchip.h>
 
 #include <asm/mach-types.h>
@@ -111,7 +110,7 @@ static __init void da830_evm_usb_init(void)
 	int ret;
 
 	/*
-	 * Set up USB clock/mode in the CFGCHIP2 register.
+	 * Set up USB clock in the CFGCHIP2 register.
 	 * FYI:  CFGCHIP2 is 0x0000ef00 initially.
 	 */
 	cfgchip2 = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
@@ -128,22 +127,15 @@ static __init void da830_evm_usb_init(void)
 	cfgchip2 &= ~CFGCHIP2_USB1PHYCLKMUX;
 	cfgchip2 |=  CFGCHIP2_USB2PHYCLKMUX;
 
-	/*
-	 * We have to override VBUS/ID signals when MUSB is configured into the
-	 * host-only mode -- ID pin will float if no cable is connected, so the
-	 * controller won't be able to drive VBUS thinking that it's a B-device.
-	 * Otherwise, we want to use the OTG mode and enable VBUS comparators.
-	 */
-	cfgchip2 &= ~CFGCHIP2_OTGMODE;
-#ifdef	CONFIG_USB_MUSB_HOST
-	cfgchip2 |=  CFGCHIP2_FORCE_HOST;
-#else
-	cfgchip2 |=  CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN;
-#endif
-
 	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
 
 	/* USB_REFCLKIN is not used. */
+
+	ret = da8xx_register_usb_phy();
+	if (ret)
+		pr_warn("%s: USB PHY registration failed: %d\n",
+			__func__, ret);
+
 	ret = davinci_cfg_reg(DA830_USB0_DRVVBUS);
 	if (ret)
 		pr_warn("%s: USB 2.0 PinMux setup failed: %d\n", __func__, ret);
diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
index 70ebbba..0fd2ef1 100644
--- a/arch/arm/mach-davinci/board-omapl138-hawk.c
+++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
@@ -259,6 +259,11 @@ static __init void omapl138_hawk_usb_init(void)
 	cfgchip2 |=  CFGCHIP2_REFFREQ_24MHZ;
 	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
 
+	ret = da8xx_register_usb_phy();
+	if (ret)
+		pr_warn("%s: USB PHY registration failed: %d\n",
+			__func__, ret);
+
 	ret = gpio_request_one(DA850_USB1_VBUS_PIN,
 			GPIOF_DIR_OUT, "USB1 VBUS");
 	if (ret < 0) {
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index 2f6fe2f0..5e07d06 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -89,6 +89,7 @@ int da850_register_edma(struct edma_rsv_info *rsv[2]);
 int da8xx_register_i2c(int instance, struct davinci_i2c_platform_data *pdata);
 int da8xx_register_spi_bus(int instance, unsigned num_chipselect);
 int da8xx_register_watchdog(void);
+int da8xx_register_usb_phy(void);
 int da8xx_register_usb20(unsigned mA, unsigned potpgt);
 int da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata);
 int da8xx_register_emac(void);
diff --git a/arch/arm/mach-davinci/usb-da8xx.c b/arch/arm/mach-davinci/usb-da8xx.c
index f141f51..4bb1903 100644
--- a/arch/arm/mach-davinci/usb-da8xx.c
+++ b/arch/arm/mach-davinci/usb-da8xx.c
@@ -3,6 +3,7 @@
  */
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
+#include <linux/phy/phy.h>
 #include <linux/platform_data/usb-davinci.h>
 #include <linux/platform_device.h>
 #include <linux/usb/musb.h>
@@ -15,6 +16,16 @@
 #define DA8XX_USB0_BASE		0x01e00000
 #define DA8XX_USB1_BASE		0x01e25000
 
+static struct platform_device da8xx_usb_phy = {
+	.name		= "da8xx-usb-phy",
+	.id		= -1,
+};
+
+int __init da8xx_register_usb_phy(void)
+{
+	return platform_device_register(&da8xx_usb_phy);
+}
+
 #if IS_ENABLED(CONFIG_USB_MUSB_HDRC)
 
 static struct musb_hdrc_config musb_config = {
-- 
2.7.4

Re: [PATCH v7 1/4] ARM: davinci: da8xx: Add USB PHY platform declaration

[Sekhar Nori]

On Thursday 27 October 2016 05:48 AM, David Lechner wrote:
> There is now a proper phy driver for the DA8xx SoC USB PHY. This adds the
> platform device declarations needed to use it.
> 
> Signed-off-by: David Lechner <david@lechnology.com>
> ---
> 
> Updated this patch so that it applies/builds cleanly before "ARM: davinci:
> da8xx: add usb phy clocks" since that patch now uses da8xx_usb_phy from this
> patch.
> 
> 
>  arch/arm/mach-davinci/board-da830-evm.c     | 22 +++++++---------------
>  arch/arm/mach-davinci/board-omapl138-hawk.c |  5 +++++
>  arch/arm/mach-davinci/include/mach/da8xx.h  |  1 +
>  arch/arm/mach-davinci/usb-da8xx.c           | 11 +++++++++++
>  4 files changed, 24 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
> index 2a96b40..829f68d 100644
> --- a/arch/arm/mach-davinci/board-da830-evm.c
> +++ b/arch/arm/mach-davinci/board-da830-evm.c
> @@ -26,7 +26,6 @@
>  #include <linux/platform_data/mtd-davinci.h>
>  #include <linux/platform_data/mtd-davinci-aemif.h>
>  #include <linux/platform_data/spi-davinci.h>
> -#include <linux/platform_data/usb-davinci.h>

I applied this patch, but did not drop this include. usb-davinci.h 
provides the definition of da8xx_ohci_root_hub which is still used in 
this file. I guess it did not lead to a build error because the file is 
still getting included indirectly. But I rather prefer a direct include 
of this file.

Attached is the patch I applied for reference.

Thanks,
Sekhar

---8<---
>From 00e69229147533769df8637ff4d4bb098150e325 Mon Sep 17 00:00:00 2001
From: David Lechner <david@lechnology.com>
Date: Wed, 26 Oct 2016 19:18:15 -0500
Subject: [PATCH] ARM: davinci: da8xx: Add USB PHY platform device

There is now a proper phy driver for the DA8xx SoC USB PHY. This adds the
platform device declarations needed to use it.

Signed-off-by: David Lechner <david@lechnology.com>
[nsekhar@ti.com: keep usb-davinci.h included in board-da830-evm.c
		 minor subject line adjustment]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
---
 arch/arm/mach-davinci/board-da830-evm.c     | 21 +++++++--------------
 arch/arm/mach-davinci/board-omapl138-hawk.c |  5 +++++
 arch/arm/mach-davinci/include/mach/da8xx.h  |  1 +
 arch/arm/mach-davinci/usb-da8xx.c           | 11 +++++++++++
 4 files changed, 24 insertions(+), 14 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index 6001b32305ec..53172add5248 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -112,7 +112,7 @@ static __init void da830_evm_usb_init(void)
 	int ret;
 
 	/*
-	 * Set up USB clock/mode in the CFGCHIP2 register.
+	 * Set up USB clock in the CFGCHIP2 register.
 	 * FYI:  CFGCHIP2 is 0x0000ef00 initially.
 	 */
 	cfgchip2 = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
@@ -129,22 +129,15 @@ static __init void da830_evm_usb_init(void)
 	cfgchip2 &= ~CFGCHIP2_USB1PHYCLKMUX;
 	cfgchip2 |=  CFGCHIP2_USB2PHYCLKMUX;
 
-	/*
-	 * We have to override VBUS/ID signals when MUSB is configured into the
-	 * host-only mode -- ID pin will float if no cable is connected, so the
-	 * controller won't be able to drive VBUS thinking that it's a B-device.
-	 * Otherwise, we want to use the OTG mode and enable VBUS comparators.
-	 */
-	cfgchip2 &= ~CFGCHIP2_OTGMODE_MASK;
-#ifdef	CONFIG_USB_MUSB_HOST
-	cfgchip2 |=  CFGCHIP2_FORCE_HOST;
-#else
-	cfgchip2 |=  CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN;
-#endif
-
 	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
 
 	/* USB_REFCLKIN is not used. */
+
+	ret = da8xx_register_usb_phy();
+	if (ret)
+		pr_warn("%s: USB PHY registration failed: %d\n",
+			__func__, ret);
+
 	ret = davinci_cfg_reg(DA830_USB0_DRVVBUS);
 	if (ret)
 		pr_warn("%s: USB 2.0 PinMux setup failed: %d\n", __func__, ret);
diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
index 70ed5ef2ef8c..67477ca4f15a 100644
--- a/arch/arm/mach-davinci/board-omapl138-hawk.c
+++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
@@ -260,6 +260,11 @@ static __init void omapl138_hawk_usb_init(void)
 	cfgchip2 |=  CFGCHIP2_REFFREQ_24MHZ;
 	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
 
+	ret = da8xx_register_usb_phy();
+	if (ret)
+		pr_warn("%s: USB PHY registration failed: %d\n",
+			__func__, ret);
+
 	ret = gpio_request_one(DA850_USB1_VBUS_PIN,
 			GPIOF_DIR_OUT, "USB1 VBUS");
 	if (ret < 0) {
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index 2f6fe2f0c733..5e07d06f60e4 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -89,6 +89,7 @@ int da850_register_edma(struct edma_rsv_info *rsv[2]);
 int da8xx_register_i2c(int instance, struct davinci_i2c_platform_data *pdata);
 int da8xx_register_spi_bus(int instance, unsigned num_chipselect);
 int da8xx_register_watchdog(void);
+int da8xx_register_usb_phy(void);
 int da8xx_register_usb20(unsigned mA, unsigned potpgt);
 int da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata);
 int da8xx_register_emac(void);
diff --git a/arch/arm/mach-davinci/usb-da8xx.c b/arch/arm/mach-davinci/usb-da8xx.c
index f141f5171906..4bb190380060 100644
--- a/arch/arm/mach-davinci/usb-da8xx.c
+++ b/arch/arm/mach-davinci/usb-da8xx.c
@@ -3,6 +3,7 @@
  */
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
+#include <linux/phy/phy.h>
 #include <linux/platform_data/usb-davinci.h>
 #include <linux/platform_device.h>
 #include <linux/usb/musb.h>
@@ -15,6 +16,16 @@
 #define DA8XX_USB0_BASE		0x01e00000
 #define DA8XX_USB1_BASE		0x01e25000
 
+static struct platform_device da8xx_usb_phy = {
+	.name		= "da8xx-usb-phy",
+	.id		= -1,
+};
+
+int __init da8xx_register_usb_phy(void)
+{
+	return platform_device_register(&da8xx_usb_phy);
+}
+
 #if IS_ENABLED(CONFIG_USB_MUSB_HDRC)
 
 static struct musb_hdrc_config musb_config = {
-- 
2.9.0

[PATCH v7 1/4] ARM: davinci: da8xx: Add USB PHY platform declaration

[Sekhar Nori]

On Thursday 27 October 2016 05:48 AM, David Lechner wrote:
> There is now a proper phy driver for the DA8xx SoC USB PHY. This adds the
> platform device declarations needed to use it.
> 
> Signed-off-by: David Lechner <david@lechnology.com>
> ---
> 
> Updated this patch so that it applies/builds cleanly before "ARM: davinci:
> da8xx: add usb phy clocks" since that patch now uses da8xx_usb_phy from this
> patch.
> 
> 
>  arch/arm/mach-davinci/board-da830-evm.c     | 22 +++++++---------------
>  arch/arm/mach-davinci/board-omapl138-hawk.c |  5 +++++
>  arch/arm/mach-davinci/include/mach/da8xx.h  |  1 +
>  arch/arm/mach-davinci/usb-da8xx.c           | 11 +++++++++++
>  4 files changed, 24 insertions(+), 15 deletions(-)
> 
> diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
> index 2a96b40..829f68d 100644
> --- a/arch/arm/mach-davinci/board-da830-evm.c
> +++ b/arch/arm/mach-davinci/board-da830-evm.c
> @@ -26,7 +26,6 @@
>  #include <linux/platform_data/mtd-davinci.h>
>  #include <linux/platform_data/mtd-davinci-aemif.h>
>  #include <linux/platform_data/spi-davinci.h>
> -#include <linux/platform_data/usb-davinci.h>

I applied this patch, but did not drop this include. usb-davinci.h 
provides the definition of da8xx_ohci_root_hub which is still used in 
this file. I guess it did not lead to a build error because the file is 
still getting included indirectly. But I rather prefer a direct include 
of this file.

Attached is the patch I applied for reference.

Thanks,
Sekhar

---8<---
>From 00e69229147533769df8637ff4d4bb098150e325 Mon Sep 17 00:00:00 2001
From: David Lechner <david@lechnology.com>
Date: Wed, 26 Oct 2016 19:18:15 -0500
Subject: [PATCH] ARM: davinci: da8xx: Add USB PHY platform device

There is now a proper phy driver for the DA8xx SoC USB PHY. This adds the
platform device declarations needed to use it.

Signed-off-by: David Lechner <david@lechnology.com>
[nsekhar at ti.com: keep usb-davinci.h included in board-da830-evm.c
		 minor subject line adjustment]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
---
 arch/arm/mach-davinci/board-da830-evm.c     | 21 +++++++--------------
 arch/arm/mach-davinci/board-omapl138-hawk.c |  5 +++++
 arch/arm/mach-davinci/include/mach/da8xx.h  |  1 +
 arch/arm/mach-davinci/usb-da8xx.c           | 11 +++++++++++
 4 files changed, 24 insertions(+), 14 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index 6001b32305ec..53172add5248 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -112,7 +112,7 @@ static __init void da830_evm_usb_init(void)
 	int ret;
 
 	/*
-	 * Set up USB clock/mode in the CFGCHIP2 register.
+	 * Set up USB clock in the CFGCHIP2 register.
 	 * FYI:  CFGCHIP2 is 0x0000ef00 initially.
 	 */
 	cfgchip2 = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
@@ -129,22 +129,15 @@ static __init void da830_evm_usb_init(void)
 	cfgchip2 &= ~CFGCHIP2_USB1PHYCLKMUX;
 	cfgchip2 |=  CFGCHIP2_USB2PHYCLKMUX;
 
-	/*
-	 * We have to override VBUS/ID signals when MUSB is configured into the
-	 * host-only mode -- ID pin will float if no cable is connected, so the
-	 * controller won't be able to drive VBUS thinking that it's a B-device.
-	 * Otherwise, we want to use the OTG mode and enable VBUS comparators.
-	 */
-	cfgchip2 &= ~CFGCHIP2_OTGMODE_MASK;
-#ifdef	CONFIG_USB_MUSB_HOST
-	cfgchip2 |=  CFGCHIP2_FORCE_HOST;
-#else
-	cfgchip2 |=  CFGCHIP2_SESENDEN | CFGCHIP2_VBDTCTEN;
-#endif
-
 	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
 
 	/* USB_REFCLKIN is not used. */
+
+	ret = da8xx_register_usb_phy();
+	if (ret)
+		pr_warn("%s: USB PHY registration failed: %d\n",
+			__func__, ret);
+
 	ret = davinci_cfg_reg(DA830_USB0_DRVVBUS);
 	if (ret)
 		pr_warn("%s: USB 2.0 PinMux setup failed: %d\n", __func__, ret);
diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
index 70ed5ef2ef8c..67477ca4f15a 100644
--- a/arch/arm/mach-davinci/board-omapl138-hawk.c
+++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
@@ -260,6 +260,11 @@ static __init void omapl138_hawk_usb_init(void)
 	cfgchip2 |=  CFGCHIP2_REFFREQ_24MHZ;
 	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
 
+	ret = da8xx_register_usb_phy();
+	if (ret)
+		pr_warn("%s: USB PHY registration failed: %d\n",
+			__func__, ret);
+
 	ret = gpio_request_one(DA850_USB1_VBUS_PIN,
 			GPIOF_DIR_OUT, "USB1 VBUS");
 	if (ret < 0) {
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index 2f6fe2f0c733..5e07d06f60e4 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -89,6 +89,7 @@ int da850_register_edma(struct edma_rsv_info *rsv[2]);
 int da8xx_register_i2c(int instance, struct davinci_i2c_platform_data *pdata);
 int da8xx_register_spi_bus(int instance, unsigned num_chipselect);
 int da8xx_register_watchdog(void);
+int da8xx_register_usb_phy(void);
 int da8xx_register_usb20(unsigned mA, unsigned potpgt);
 int da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata);
 int da8xx_register_emac(void);
diff --git a/arch/arm/mach-davinci/usb-da8xx.c b/arch/arm/mach-davinci/usb-da8xx.c
index f141f5171906..4bb190380060 100644
--- a/arch/arm/mach-davinci/usb-da8xx.c
+++ b/arch/arm/mach-davinci/usb-da8xx.c
@@ -3,6 +3,7 @@
  */
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
+#include <linux/phy/phy.h>
 #include <linux/platform_data/usb-davinci.h>
 #include <linux/platform_device.h>
 #include <linux/usb/musb.h>
@@ -15,6 +16,16 @@
 #define DA8XX_USB0_BASE		0x01e00000
 #define DA8XX_USB1_BASE		0x01e25000
 
+static struct platform_device da8xx_usb_phy = {
+	.name		= "da8xx-usb-phy",
+	.id		= -1,
+};
+
+int __init da8xx_register_usb_phy(void)
+{
+	return platform_device_register(&da8xx_usb_phy);
+}
+
 #if IS_ENABLED(CONFIG_USB_MUSB_HDRC)
 
 static struct musb_hdrc_config musb_config = {
-- 
2.9.0

[PATCH v7 2/4] ARM: davinci: da8xx: Add USB device names to clock lookup tables

[David Lechner]

This adds device names for the SoC USB devices to the clock lookup tables
in da830.c and da850.c.

Also add the USB device names to the da850_auxdata_lookup[] table.

Signed-off-by: David Lechner <david@lechnology.com>
---

This is a new patch setting up clock lookup names that will be used in "ARM:
davinci: da8xx: add usb phy clocks"


 arch/arm/mach-davinci/da830.c    | 4 ++--
 arch/arm/mach-davinci/da850.c    | 4 ++--
 arch/arm/mach-davinci/da8xx-dt.c | 2 ++
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-davinci/da830.c b/arch/arm/mach-davinci/da830.c
index 426fd74..41459bd 100644
--- a/arch/arm/mach-davinci/da830.c
+++ b/arch/arm/mach-davinci/da830.c
@@ -412,7 +412,7 @@ static struct clk_lookup da830_clks[] = {
 	CLK("davinci-mcasp.0",	NULL,		&mcasp0_clk),
 	CLK("davinci-mcasp.1",	NULL,		&mcasp1_clk),
 	CLK("davinci-mcasp.2",	NULL,		&mcasp2_clk),
-	CLK(NULL,		"usb20",	&usb20_clk),
+	CLK("musb-da8xx",	"usb20",	&usb20_clk),
 	CLK(NULL,		"aemif",	&aemif_clk),
 	CLK(NULL,		"aintc",	&aintc_clk),
 	CLK(NULL,		"secu_mgr",	&secu_mgr_clk),
@@ -420,7 +420,7 @@ static struct clk_lookup da830_clks[] = {
 	CLK("davinci_mdio.0",   "fck",          &emac_clk),
 	CLK(NULL,		"gpio",		&gpio_clk),
 	CLK("i2c_davinci.2",	NULL,		&i2c1_clk),
-	CLK(NULL,		"usb11",	&usb11_clk),
+	CLK("ohci",		"usb11",	&usb11_clk),
 	CLK(NULL,		"emif3",	&emif3_clk),
 	CLK(NULL,		"arm",		&arm_clk),
 	CLK(NULL,		"rmii",		&rmii_clk),
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index 6b78a8f..47084be 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -503,8 +503,8 @@ static struct clk_lookup da850_clks[] = {
 	CLK("da830-mmc.1",	NULL,		&mmcsd1_clk),
 	CLK("ti-aemif",		NULL,		&aemif_clk),
 	CLK(NULL,		"aemif",	&aemif_clk),
-	CLK(NULL,		"usb11",	&usb11_clk),
-	CLK(NULL,		"usb20",	&usb20_clk),
+	CLK("ohci",		"usb11",	&usb11_clk),
+	CLK("musb-da8xx",	"usb20",	&usb20_clk),
 	CLK("spi_davinci.0",	NULL,		&spi0_clk),
 	CLK("spi_davinci.1",	NULL,		&spi1_clk),
 	CLK("vpif",		NULL,		&vpif_clk),
diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
index b03ad19..aec569f9 100644
--- a/arch/arm/mach-davinci/da8xx-dt.c
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -39,6 +39,8 @@ static struct of_dev_auxdata da850_auxdata_lookup[] __initdata = {
 	OF_DEV_AUXDATA("ti,da830-mcasp-audio", 0x01d00000, "davinci-mcasp.0", NULL),
 	OF_DEV_AUXDATA("ti,da850-aemif", 0x68000000, "ti-aemif", NULL),
 	OF_DEV_AUXDATA("ti,da850-tilcdc", 0x01e13000, "da8xx_lcdc.0", NULL),
+	OF_DEV_AUXDATA("ti,da830-ohci", 0x01e25000, "ohci", NULL),
+	OF_DEV_AUXDATA("ti,da830-musb", 0x01e00000, "musb-da8xx", NULL),
 	{}
 };
 
-- 
2.7.4

[PATCH v7 2/4] ARM: davinci: da8xx: Add USB device names to clock lookup tables

[David Lechner]

This adds device names for the SoC USB devices to the clock lookup tables
in da830.c and da850.c.

Also add the USB device names to the da850_auxdata_lookup[] table.

Signed-off-by: David Lechner <david@lechnology.com>
---

This is a new patch setting up clock lookup names that will be used in "ARM:
davinci: da8xx: add usb phy clocks"


 arch/arm/mach-davinci/da830.c    | 4 ++--
 arch/arm/mach-davinci/da850.c    | 4 ++--
 arch/arm/mach-davinci/da8xx-dt.c | 2 ++
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/arch/arm/mach-davinci/da830.c b/arch/arm/mach-davinci/da830.c
index 426fd74..41459bd 100644
--- a/arch/arm/mach-davinci/da830.c
+++ b/arch/arm/mach-davinci/da830.c
@@ -412,7 +412,7 @@ static struct clk_lookup da830_clks[] = {
 	CLK("davinci-mcasp.0",	NULL,		&mcasp0_clk),
 	CLK("davinci-mcasp.1",	NULL,		&mcasp1_clk),
 	CLK("davinci-mcasp.2",	NULL,		&mcasp2_clk),
-	CLK(NULL,		"usb20",	&usb20_clk),
+	CLK("musb-da8xx",	"usb20",	&usb20_clk),
 	CLK(NULL,		"aemif",	&aemif_clk),
 	CLK(NULL,		"aintc",	&aintc_clk),
 	CLK(NULL,		"secu_mgr",	&secu_mgr_clk),
@@ -420,7 +420,7 @@ static struct clk_lookup da830_clks[] = {
 	CLK("davinci_mdio.0",   "fck",          &emac_clk),
 	CLK(NULL,		"gpio",		&gpio_clk),
 	CLK("i2c_davinci.2",	NULL,		&i2c1_clk),
-	CLK(NULL,		"usb11",	&usb11_clk),
+	CLK("ohci",		"usb11",	&usb11_clk),
 	CLK(NULL,		"emif3",	&emif3_clk),
 	CLK(NULL,		"arm",		&arm_clk),
 	CLK(NULL,		"rmii",		&rmii_clk),
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index 6b78a8f..47084be 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -503,8 +503,8 @@ static struct clk_lookup da850_clks[] = {
 	CLK("da830-mmc.1",	NULL,		&mmcsd1_clk),
 	CLK("ti-aemif",		NULL,		&aemif_clk),
 	CLK(NULL,		"aemif",	&aemif_clk),
-	CLK(NULL,		"usb11",	&usb11_clk),
-	CLK(NULL,		"usb20",	&usb20_clk),
+	CLK("ohci",		"usb11",	&usb11_clk),
+	CLK("musb-da8xx",	"usb20",	&usb20_clk),
 	CLK("spi_davinci.0",	NULL,		&spi0_clk),
 	CLK("spi_davinci.1",	NULL,		&spi1_clk),
 	CLK("vpif",		NULL,		&vpif_clk),
diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
index b03ad19..aec569f9 100644
--- a/arch/arm/mach-davinci/da8xx-dt.c
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -39,6 +39,8 @@ static struct of_dev_auxdata da850_auxdata_lookup[] __initdata = {
 	OF_DEV_AUXDATA("ti,da830-mcasp-audio", 0x01d00000, "davinci-mcasp.0", NULL),
 	OF_DEV_AUXDATA("ti,da850-aemif", 0x68000000, "ti-aemif", NULL),
 	OF_DEV_AUXDATA("ti,da850-tilcdc", 0x01e13000, "da8xx_lcdc.0", NULL),
+	OF_DEV_AUXDATA("ti,da830-ohci", 0x01e25000, "ohci", NULL),
+	OF_DEV_AUXDATA("ti,da830-musb", 0x01e00000, "musb-da8xx", NULL),
 	{}
 };
 
-- 
2.7.4

Re: [PATCH v7 2/4] ARM: davinci: da8xx: Add USB device names to clock lookup tables

[Sekhar Nori]

On Thursday 27 October 2016 05:48 AM, David Lechner wrote:
> This adds device names for the SoC USB devices to the clock lookup tables
> in da830.c and da850.c.
> 
> Also add the USB device names to the da850_auxdata_lookup[] table.
> 
> Signed-off-by: David Lechner <david@lechnology.com>

Applied to v4.10/soc

Thanks,
Sekhar

[PATCH v7 2/4] ARM: davinci: da8xx: Add USB device names to clock lookup tables

[Sekhar Nori]

On Thursday 27 October 2016 05:48 AM, David Lechner wrote:
> This adds device names for the SoC USB devices to the clock lookup tables
> in da830.c and da850.c.
> 
> Also add the USB device names to the da850_auxdata_lookup[] table.
> 
> Signed-off-by: David Lechner <david@lechnology.com>

Applied to v4.10/soc

Thanks,
Sekhar

[PATCH v7 3/4] ARM: davinci: da8xx: add usb phy clocks

[David Lechner]

Up to this point, the USB phy clock configuration was handled manually in
the board files and in the usb drivers. This adds proper clocks so that
the usb drivers can use clk_get and clk_enable and not have to worry about
the details. Also, the related code is removed from the board files and
replaced with the new clock registration functions.

This also removes the #if IS_ENABLED(CONFIG_USB_MUSB_HDRC) around the musb
declaration and renames the musb platform device so that we can reference
it from the usb20 clock even if the musb device is not used.

Signed-off-by: David Lechner <david@lechnology.com>
[added usb20_clk get/enable to usb20_phy_clk_enable()]
Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
---

This patch now includes devices instead of NULL in clk_get() where possible.
Had to add dev.init_name to these devices to ensure that clock matching works.
I have tested and clock matching fails without dev.init_name set.

I also fixed the #includes that somehow got messed up in the v6 patch.

Removing the #if IS_ENABLED(CONFIG_USB_MUSB_HDRC) is also new this go around.


 arch/arm/mach-davinci/board-da830-evm.c     |  31 +---
 arch/arm/mach-davinci/board-omapl138-hawk.c |  15 +-
 arch/arm/mach-davinci/da8xx-dt.c            |   1 +
 arch/arm/mach-davinci/include/mach/da8xx.h  |   3 +
 arch/arm/mach-davinci/usb-da8xx.c           | 261 ++++++++++++++++++++++++++--
 5 files changed, 269 insertions(+), 42 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index 829f68d..c62766e 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -26,7 +26,6 @@
 #include <linux/platform_data/mtd-davinci.h>
 #include <linux/platform_data/mtd-davinci-aemif.h>
 #include <linux/platform_data/spi-davinci.h>
-#include <linux/mfd/da8xx-cfgchip.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -106,30 +105,18 @@ static irqreturn_t da830_evm_usb_ocic_irq(int irq, void *dev_id)
 
 static __init void da830_evm_usb_init(void)
 {
-	u32 cfgchip2;
 	int ret;
 
-	/*
-	 * Set up USB clock in the CFGCHIP2 register.
-	 * FYI:  CFGCHIP2 is 0x0000ef00 initially.
-	 */
-	cfgchip2 = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
-
-	/* USB2.0 PHY reference clock is 24 MHz */
-	cfgchip2 &= ~CFGCHIP2_REFFREQ;
-	cfgchip2 |=  CFGCHIP2_REFFREQ_24MHZ;
-
-	/*
-	 * Select internal reference clock for USB 2.0 PHY
-	 * and use it as a clock source for USB 1.1 PHY
-	 * (this is the default setting anyway).
-	 */
-	cfgchip2 &= ~CFGCHIP2_USB1PHYCLKMUX;
-	cfgchip2 |=  CFGCHIP2_USB2PHYCLKMUX;
-
-	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
-
 	/* USB_REFCLKIN is not used. */
+	ret = da8xx_register_usb20_phy_clk(false);
+	if (ret)
+		pr_warn("%s: USB 2.0 PHY CLK registration failed: %d\n",
+			__func__, ret);
+
+	ret = da8xx_register_usb11_phy_clk(false);
+	if (ret)
+		pr_warn("%s: USB 1.1 PHY CLK registration failed: %d\n",
+			__func__, ret);
 
 	ret = da8xx_register_usb_phy();
 	if (ret)
diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
index 0fd2ef1..3798ee4 100644
--- a/arch/arm/mach-davinci/board-omapl138-hawk.c
+++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
@@ -14,7 +14,6 @@
 #include <linux/console.h>
 #include <linux/gpio.h>
 #include <linux/platform_data/gpio-davinci.h>
-#include <linux/mfd/da8xx-cfgchip.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -244,7 +243,6 @@ static irqreturn_t omapl138_hawk_usb_ocic_irq(int irq, void *dev_id)
 static __init void omapl138_hawk_usb_init(void)
 {
 	int ret;
-	u32 cfgchip2;
 
 	ret = davinci_cfg_reg_list(da850_hawk_usb11_pins);
 	if (ret) {
@@ -252,12 +250,15 @@ static __init void omapl138_hawk_usb_init(void)
 		return;
 	}
 
-	/* Setup the Ref. clock frequency for the HAWK at 24 MHz. */
+	ret = da8xx_register_usb20_phy_clk(false);
+	if (ret)
+		pr_warn("%s: USB 2.0 PHY CLK registration failed: %d\n",
+			__func__, ret);
 
-	cfgchip2 = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
-	cfgchip2 &= ~CFGCHIP2_REFFREQ;
-	cfgchip2 |=  CFGCHIP2_REFFREQ_24MHZ;
-	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+	ret = da8xx_register_usb11_phy_clk(false);
+	if (ret)
+		pr_warn("%s: USB 1.1 PHY CLK registration failed: %d\n",
+			__func__, ret);
 
 	ret = da8xx_register_usb_phy();
 	if (ret)
diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
index aec569f9..75e831d 100644
--- a/arch/arm/mach-davinci/da8xx-dt.c
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -41,6 +41,7 @@ static struct of_dev_auxdata da850_auxdata_lookup[] __initdata = {
 	OF_DEV_AUXDATA("ti,da850-tilcdc", 0x01e13000, "da8xx_lcdc.0", NULL),
 	OF_DEV_AUXDATA("ti,da830-ohci", 0x01e25000, "ohci", NULL),
 	OF_DEV_AUXDATA("ti,da830-musb", 0x01e00000, "musb-da8xx", NULL),
+	OF_DEV_AUXDATA("ti,da830-usb-phy", 0x01c00000, "da8xx-usb-phy", NULL),
 	{}
 };
 
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index 5e07d06..43322be 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -92,6 +92,9 @@ int da8xx_register_watchdog(void);
 int da8xx_register_usb_phy(void);
 int da8xx_register_usb20(unsigned mA, unsigned potpgt);
 int da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata);
+int da8xx_register_usb_refclkin(int rate);
+int da8xx_register_usb20_phy_clk(bool use_usb_refclkin);
+int da8xx_register_usb11_phy_clk(bool use_usb_refclkin);
 int da8xx_register_emac(void);
 int da8xx_register_uio_pruss(void);
 int da8xx_register_lcdc(struct da8xx_lcdc_platform_data *pdata);
diff --git a/arch/arm/mach-davinci/usb-da8xx.c b/arch/arm/mach-davinci/usb-da8xx.c
index 4bb1903..b010e5f 100644
--- a/arch/arm/mach-davinci/usb-da8xx.c
+++ b/arch/arm/mach-davinci/usb-da8xx.c
@@ -1,24 +1,38 @@
 /*
  * DA8xx USB
  */
+#include <linux/clk.h>
+#include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
+#include <linux/mfd/da8xx-cfgchip.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_data/usb-davinci.h>
 #include <linux/platform_device.h>
 #include <linux/usb/musb.h>
 
+#include <mach/clock.h>
 #include <mach/common.h>
 #include <mach/cputype.h>
 #include <mach/da8xx.h>
 #include <mach/irqs.h>
 
+#include "clock.h"
+
 #define DA8XX_USB0_BASE		0x01e00000
 #define DA8XX_USB1_BASE		0x01e25000
 
 static struct platform_device da8xx_usb_phy = {
 	.name		= "da8xx-usb-phy",
 	.id		= -1,
+	.dev		= {
+		/*
+		 * Setting init_name so that clock lookup will work in
+		 * da8xx_register_usb11_phy_clk() even if this device is not
+		 * registered yet.
+		 */
+		.init_name	= "da8xx-usb-phy",
+	},
 };
 
 int __init da8xx_register_usb_phy(void)
@@ -26,8 +40,6 @@ int __init da8xx_register_usb_phy(void)
 	return platform_device_register(&da8xx_usb_phy);
 }
 
-#if IS_ENABLED(CONFIG_USB_MUSB_HDRC)
-
 static struct musb_hdrc_config musb_config = {
 	.multipoint	= true,
 	.num_eps	= 5,
@@ -56,10 +68,15 @@ static struct resource da8xx_usb20_resources[] = {
 
 static u64 usb_dmamask = DMA_BIT_MASK(32);
 
-static struct platform_device usb_dev = {
+static struct platform_device da8xx_usb20_dev = {
 	.name		= "musb-da8xx",
 	.id             = -1,
 	.dev = {
+		/*
+		 * Setting init_name so that clock lookup will work in
+		 * usb20_phy_clk_enable() even if this device is not registered.
+		 */
+		.init_name		= "musb-da8xx",
 		.platform_data		= &usb_data,
 		.dma_mask		= &usb_dmamask,
 		.coherent_dma_mask      = DMA_BIT_MASK(32),
@@ -73,18 +90,9 @@ int __init da8xx_register_usb20(unsigned int mA, unsigned int potpgt)
 	usb_data.power	= mA > 510 ? 255 : mA / 2;
 	usb_data.potpgt = (potpgt + 1) / 2;
 
-	return platform_device_register(&usb_dev);
-}
-
-#else
-
-int __init da8xx_register_usb20(unsigned int mA, unsigned int potpgt)
-{
-	return 0;
+	return platform_device_register(&da8xx_usb20_dev);
 }
 
-#endif  /* CONFIG_USB_MUSB_HDRC */
-
 static struct resource da8xx_usb11_resources[] = {
 	[0] = {
 		.start	= DA8XX_USB1_BASE,
@@ -116,3 +124,236 @@ int __init da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata)
 	da8xx_usb11_device.dev.platform_data = pdata;
 	return platform_device_register(&da8xx_usb11_device);
 }
+
+static struct clk usb_refclkin = {
+	.name		= "usb_refclkin",
+	.set_rate	= davinci_simple_set_rate,
+};
+
+static struct clk_lookup usb_refclkin_lookup =
+	CLK(NULL, "usb_refclkin", &usb_refclkin);
+
+/**
+ * da8xx_register_usb_refclkin - register USB_REFCLKIN clock
+ *
+ * @rate: The clock rate in Hz
+ *
+ * This clock is only needed if the board provides an external USB_REFCLKIN
+ * signal, in which case it will be used as the parent of usb20_phy_clk and/or
+ * usb11_phy_clk.
+ */
+int __init da8xx_register_usb_refclkin(int rate)
+{
+	int ret;
+
+	usb_refclkin.rate = rate;
+	ret = clk_register(&usb_refclkin);
+	if (ret)
+		return ret;
+
+	clkdev_add(&usb_refclkin_lookup);
+
+	return 0;
+}
+
+static void usb20_phy_clk_enable(struct clk *clk)
+{
+	struct clk *usb20_clk;
+	int err;
+	u32 val;
+	u32 timeout = 500000; /* 500 msec */
+
+	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	usb20_clk = clk_get(&da8xx_usb20_dev.dev, "usb20");
+	if (IS_ERR(usb20_clk)) {
+		pr_err("could not get usb20 clk: %ld\n", PTR_ERR(usb20_clk));
+		return;
+	}
+
+	/* The USB 2.O PLL requires that the USB 2.O PSC is enabled as well. */
+	err = clk_prepare_enable(usb20_clk);
+	if (err) {
+		pr_err("failed to enable usb20 clk: %d\n", err);
+		clk_put(usb20_clk);
+		return;
+	}
+
+	/*
+	 * Turn on the USB 2.0 PHY, but just the PLL, and not OTG. The USB 1.1
+	 * host may use the PLL clock without USB 2.0 OTG being used.
+	 */
+	val &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN);
+	val |= CFGCHIP2_PHY_PLLON;
+
+	writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	while (--timeout) {
+		val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+		if (val & CFGCHIP2_PHYCLKGD)
+			goto done;
+		udelay(1);
+	}
+
+	pr_err("Timeout waiting for USB 2.0 PHY clock good\n");
+done:
+	clk_disable_unprepare(usb20_clk);
+	clk_put(usb20_clk);
+}
+
+static void usb20_phy_clk_disable(struct clk *clk)
+{
+	u32 val;
+
+	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+	val |= CFGCHIP2_PHYPWRDN;
+	writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+}
+
+static int usb20_phy_clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	u32 val;
+
+	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	/* Set the mux depending on the parent clock. */
+	if (parent == &usb_refclkin) {
+		val &= ~CFGCHIP2_USB2PHYCLKMUX;
+	} else if (strcmp(parent->name, "pll0_aux_clk") == 0) {
+		val |= CFGCHIP2_USB2PHYCLKMUX;
+	} else {
+		pr_err("Bad parent on USB 2.0 PHY clock\n");
+		return -EINVAL;
+	}
+
+	/* reference frequency also comes from parent clock */
+	val &= ~CFGCHIP2_REFFREQ_MASK;
+	switch (clk_get_rate(parent)) {
+	case 12000000:
+		val |= CFGCHIP2_REFFREQ_12MHZ;
+		break;
+	case 13000000:
+		val |= CFGCHIP2_REFFREQ_13MHZ;
+		break;
+	case 19200000:
+		val |= CFGCHIP2_REFFREQ_19_2MHZ;
+		break;
+	case 20000000:
+		val |= CFGCHIP2_REFFREQ_20MHZ;
+		break;
+	case 24000000:
+		val |= CFGCHIP2_REFFREQ_24MHZ;
+		break;
+	case 26000000:
+		val |= CFGCHIP2_REFFREQ_26MHZ;
+		break;
+	case 38400000:
+		val |= CFGCHIP2_REFFREQ_38_4MHZ;
+		break;
+	case 40000000:
+		val |= CFGCHIP2_REFFREQ_40MHZ;
+		break;
+	case 48000000:
+		val |= CFGCHIP2_REFFREQ_48MHZ;
+		break;
+	default:
+		pr_err("Bad parent clock rate on USB 2.0 PHY clock\n");
+		return -EINVAL;
+	}
+
+	writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	return 0;
+}
+
+static struct clk usb20_phy_clk = {
+	.name		= "usb20_phy",
+	.clk_enable	= usb20_phy_clk_enable,
+	.clk_disable	= usb20_phy_clk_disable,
+	.set_parent	= usb20_phy_clk_set_parent,
+};
+
+static struct clk_lookup usb20_phy_clk_lookup =
+	CLK("da8xx-usb-phy", "usb20_phy", &usb20_phy_clk);
+
+/**
+ * da8xx_register_usb20_phy_clk - register USB0PHYCLKMUX clock
+ *
+ * @use_usb_refclkin: Selects the parent clock - either "usb_refclkin" if true
+ *	or "pll0_aux" if false.
+ */
+int __init da8xx_register_usb20_phy_clk(bool use_usb_refclkin)
+{
+	struct clk *parent;
+	int ret = 0;
+
+	parent = clk_get(NULL, use_usb_refclkin ? "usb_refclkin" : "pll0_aux");
+	if (IS_ERR(parent))
+		return PTR_ERR(parent);
+
+	usb20_phy_clk.parent = parent;
+	ret = clk_register(&usb20_phy_clk);
+	if (!ret)
+		clkdev_add(&usb20_phy_clk_lookup);
+
+	clk_put(parent);
+
+	return ret;
+}
+
+static int usb11_phy_clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	u32 val;
+
+	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	/* Set the USB 1.1 PHY clock mux based on the parent clock. */
+	if (parent == &usb20_phy_clk) {
+		val &= ~CFGCHIP2_USB1PHYCLKMUX;
+	} else if (parent == &usb_refclkin) {
+		val |= CFGCHIP2_USB1PHYCLKMUX;
+	} else {
+		pr_err("Bad parent on USB 1.1 PHY clock\n");
+		return -EINVAL;
+	}
+
+	writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	return 0;
+}
+
+static struct clk usb11_phy_clk = {
+	.name		= "usb11_phy",
+	.set_parent	= usb11_phy_clk_set_parent,
+};
+
+static struct clk_lookup usb11_phy_clk_lookup =
+	CLK("da8xx-usb-phy", "usb11_phy", &usb11_phy_clk);
+
+/**
+ * da8xx_register_usb11_phy_clk - register USB1PHYCLKMUX clock
+ *
+ * @use_usb_refclkin: Selects the parent clock - either "usb_refclkin" if true
+ *	or "usb20_phy" if false.
+ */
+int __init da8xx_register_usb11_phy_clk(bool use_usb_refclkin)
+{
+	struct clk *parent;
+	int ret = 0;
+
+	if (use_usb_refclkin)
+		parent = clk_get(NULL, "usb_refclkin");
+	else
+		parent = clk_get(&da8xx_usb_phy.dev, "usb20_phy");
+	if (IS_ERR(parent))
+		return PTR_ERR(parent);
+
+	usb11_phy_clk.parent = parent;
+	ret = clk_register(&usb11_phy_clk);
+	if (!ret)
+		clkdev_add(&usb11_phy_clk_lookup);
+
+	clk_put(parent);
+
+	return ret;
+}
-- 
2.7.4

[PATCH v7 3/4] ARM: davinci: da8xx: add usb phy clocks

[David Lechner]

Up to this point, the USB phy clock configuration was handled manually in
the board files and in the usb drivers. This adds proper clocks so that
the usb drivers can use clk_get and clk_enable and not have to worry about
the details. Also, the related code is removed from the board files and
replaced with the new clock registration functions.

This also removes the #if IS_ENABLED(CONFIG_USB_MUSB_HDRC) around the musb
declaration and renames the musb platform device so that we can reference
it from the usb20 clock even if the musb device is not used.

Signed-off-by: David Lechner <david@lechnology.com>
[added usb20_clk get/enable to usb20_phy_clk_enable()]
Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
---

This patch now includes devices instead of NULL in clk_get() where possible.
Had to add dev.init_name to these devices to ensure that clock matching works.
I have tested and clock matching fails without dev.init_name set.

I also fixed the #includes that somehow got messed up in the v6 patch.

Removing the #if IS_ENABLED(CONFIG_USB_MUSB_HDRC) is also new this go around.


 arch/arm/mach-davinci/board-da830-evm.c     |  31 +---
 arch/arm/mach-davinci/board-omapl138-hawk.c |  15 +-
 arch/arm/mach-davinci/da8xx-dt.c            |   1 +
 arch/arm/mach-davinci/include/mach/da8xx.h  |   3 +
 arch/arm/mach-davinci/usb-da8xx.c           | 261 ++++++++++++++++++++++++++--
 5 files changed, 269 insertions(+), 42 deletions(-)

diff --git a/arch/arm/mach-davinci/board-da830-evm.c b/arch/arm/mach-davinci/board-da830-evm.c
index 829f68d..c62766e 100644
--- a/arch/arm/mach-davinci/board-da830-evm.c
+++ b/arch/arm/mach-davinci/board-da830-evm.c
@@ -26,7 +26,6 @@
 #include <linux/platform_data/mtd-davinci.h>
 #include <linux/platform_data/mtd-davinci-aemif.h>
 #include <linux/platform_data/spi-davinci.h>
-#include <linux/mfd/da8xx-cfgchip.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -106,30 +105,18 @@ static irqreturn_t da830_evm_usb_ocic_irq(int irq, void *dev_id)
 
 static __init void da830_evm_usb_init(void)
 {
-	u32 cfgchip2;
 	int ret;
 
-	/*
-	 * Set up USB clock in the CFGCHIP2 register.
-	 * FYI:  CFGCHIP2 is 0x0000ef00 initially.
-	 */
-	cfgchip2 = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
-
-	/* USB2.0 PHY reference clock is 24 MHz */
-	cfgchip2 &= ~CFGCHIP2_REFFREQ;
-	cfgchip2 |=  CFGCHIP2_REFFREQ_24MHZ;
-
-	/*
-	 * Select internal reference clock for USB 2.0 PHY
-	 * and use it as a clock source for USB 1.1 PHY
-	 * (this is the default setting anyway).
-	 */
-	cfgchip2 &= ~CFGCHIP2_USB1PHYCLKMUX;
-	cfgchip2 |=  CFGCHIP2_USB2PHYCLKMUX;
-
-	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
-
 	/* USB_REFCLKIN is not used. */
+	ret = da8xx_register_usb20_phy_clk(false);
+	if (ret)
+		pr_warn("%s: USB 2.0 PHY CLK registration failed: %d\n",
+			__func__, ret);
+
+	ret = da8xx_register_usb11_phy_clk(false);
+	if (ret)
+		pr_warn("%s: USB 1.1 PHY CLK registration failed: %d\n",
+			__func__, ret);
 
 	ret = da8xx_register_usb_phy();
 	if (ret)
diff --git a/arch/arm/mach-davinci/board-omapl138-hawk.c b/arch/arm/mach-davinci/board-omapl138-hawk.c
index 0fd2ef1..3798ee4 100644
--- a/arch/arm/mach-davinci/board-omapl138-hawk.c
+++ b/arch/arm/mach-davinci/board-omapl138-hawk.c
@@ -14,7 +14,6 @@
 #include <linux/console.h>
 #include <linux/gpio.h>
 #include <linux/platform_data/gpio-davinci.h>
-#include <linux/mfd/da8xx-cfgchip.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -244,7 +243,6 @@ static irqreturn_t omapl138_hawk_usb_ocic_irq(int irq, void *dev_id)
 static __init void omapl138_hawk_usb_init(void)
 {
 	int ret;
-	u32 cfgchip2;
 
 	ret = davinci_cfg_reg_list(da850_hawk_usb11_pins);
 	if (ret) {
@@ -252,12 +250,15 @@ static __init void omapl138_hawk_usb_init(void)
 		return;
 	}
 
-	/* Setup the Ref. clock frequency for the HAWK at 24 MHz. */
+	ret = da8xx_register_usb20_phy_clk(false);
+	if (ret)
+		pr_warn("%s: USB 2.0 PHY CLK registration failed: %d\n",
+			__func__, ret);
 
-	cfgchip2 = __raw_readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
-	cfgchip2 &= ~CFGCHIP2_REFFREQ;
-	cfgchip2 |=  CFGCHIP2_REFFREQ_24MHZ;
-	__raw_writel(cfgchip2, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+	ret = da8xx_register_usb11_phy_clk(false);
+	if (ret)
+		pr_warn("%s: USB 1.1 PHY CLK registration failed: %d\n",
+			__func__, ret);
 
 	ret = da8xx_register_usb_phy();
 	if (ret)
diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
index aec569f9..75e831d 100644
--- a/arch/arm/mach-davinci/da8xx-dt.c
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -41,6 +41,7 @@ static struct of_dev_auxdata da850_auxdata_lookup[] __initdata = {
 	OF_DEV_AUXDATA("ti,da850-tilcdc", 0x01e13000, "da8xx_lcdc.0", NULL),
 	OF_DEV_AUXDATA("ti,da830-ohci", 0x01e25000, "ohci", NULL),
 	OF_DEV_AUXDATA("ti,da830-musb", 0x01e00000, "musb-da8xx", NULL),
+	OF_DEV_AUXDATA("ti,da830-usb-phy", 0x01c00000, "da8xx-usb-phy", NULL),
 	{}
 };
 
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index 5e07d06..43322be 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -92,6 +92,9 @@ int da8xx_register_watchdog(void);
 int da8xx_register_usb_phy(void);
 int da8xx_register_usb20(unsigned mA, unsigned potpgt);
 int da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata);
+int da8xx_register_usb_refclkin(int rate);
+int da8xx_register_usb20_phy_clk(bool use_usb_refclkin);
+int da8xx_register_usb11_phy_clk(bool use_usb_refclkin);
 int da8xx_register_emac(void);
 int da8xx_register_uio_pruss(void);
 int da8xx_register_lcdc(struct da8xx_lcdc_platform_data *pdata);
diff --git a/arch/arm/mach-davinci/usb-da8xx.c b/arch/arm/mach-davinci/usb-da8xx.c
index 4bb1903..b010e5f 100644
--- a/arch/arm/mach-davinci/usb-da8xx.c
+++ b/arch/arm/mach-davinci/usb-da8xx.c
@@ -1,24 +1,38 @@
 /*
  * DA8xx USB
  */
+#include <linux/clk.h>
+#include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/init.h>
+#include <linux/mfd/da8xx-cfgchip.h>
 #include <linux/phy/phy.h>
 #include <linux/platform_data/usb-davinci.h>
 #include <linux/platform_device.h>
 #include <linux/usb/musb.h>
 
+#include <mach/clock.h>
 #include <mach/common.h>
 #include <mach/cputype.h>
 #include <mach/da8xx.h>
 #include <mach/irqs.h>
 
+#include "clock.h"
+
 #define DA8XX_USB0_BASE		0x01e00000
 #define DA8XX_USB1_BASE		0x01e25000
 
 static struct platform_device da8xx_usb_phy = {
 	.name		= "da8xx-usb-phy",
 	.id		= -1,
+	.dev		= {
+		/*
+		 * Setting init_name so that clock lookup will work in
+		 * da8xx_register_usb11_phy_clk() even if this device is not
+		 * registered yet.
+		 */
+		.init_name	= "da8xx-usb-phy",
+	},
 };
 
 int __init da8xx_register_usb_phy(void)
@@ -26,8 +40,6 @@ int __init da8xx_register_usb_phy(void)
 	return platform_device_register(&da8xx_usb_phy);
 }
 
-#if IS_ENABLED(CONFIG_USB_MUSB_HDRC)
-
 static struct musb_hdrc_config musb_config = {
 	.multipoint	= true,
 	.num_eps	= 5,
@@ -56,10 +68,15 @@ static struct resource da8xx_usb20_resources[] = {
 
 static u64 usb_dmamask = DMA_BIT_MASK(32);
 
-static struct platform_device usb_dev = {
+static struct platform_device da8xx_usb20_dev = {
 	.name		= "musb-da8xx",
 	.id             = -1,
 	.dev = {
+		/*
+		 * Setting init_name so that clock lookup will work in
+		 * usb20_phy_clk_enable() even if this device is not registered.
+		 */
+		.init_name		= "musb-da8xx",
 		.platform_data		= &usb_data,
 		.dma_mask		= &usb_dmamask,
 		.coherent_dma_mask      = DMA_BIT_MASK(32),
@@ -73,18 +90,9 @@ int __init da8xx_register_usb20(unsigned int mA, unsigned int potpgt)
 	usb_data.power	= mA > 510 ? 255 : mA / 2;
 	usb_data.potpgt = (potpgt + 1) / 2;
 
-	return platform_device_register(&usb_dev);
-}
-
-#else
-
-int __init da8xx_register_usb20(unsigned int mA, unsigned int potpgt)
-{
-	return 0;
+	return platform_device_register(&da8xx_usb20_dev);
 }
 
-#endif  /* CONFIG_USB_MUSB_HDRC */
-
 static struct resource da8xx_usb11_resources[] = {
 	[0] = {
 		.start	= DA8XX_USB1_BASE,
@@ -116,3 +124,236 @@ int __init da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata)
 	da8xx_usb11_device.dev.platform_data = pdata;
 	return platform_device_register(&da8xx_usb11_device);
 }
+
+static struct clk usb_refclkin = {
+	.name		= "usb_refclkin",
+	.set_rate	= davinci_simple_set_rate,
+};
+
+static struct clk_lookup usb_refclkin_lookup =
+	CLK(NULL, "usb_refclkin", &usb_refclkin);
+
+/**
+ * da8xx_register_usb_refclkin - register USB_REFCLKIN clock
+ *
+ * @rate: The clock rate in Hz
+ *
+ * This clock is only needed if the board provides an external USB_REFCLKIN
+ * signal, in which case it will be used as the parent of usb20_phy_clk and/or
+ * usb11_phy_clk.
+ */
+int __init da8xx_register_usb_refclkin(int rate)
+{
+	int ret;
+
+	usb_refclkin.rate = rate;
+	ret = clk_register(&usb_refclkin);
+	if (ret)
+		return ret;
+
+	clkdev_add(&usb_refclkin_lookup);
+
+	return 0;
+}
+
+static void usb20_phy_clk_enable(struct clk *clk)
+{
+	struct clk *usb20_clk;
+	int err;
+	u32 val;
+	u32 timeout = 500000; /* 500 msec */
+
+	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	usb20_clk = clk_get(&da8xx_usb20_dev.dev, "usb20");
+	if (IS_ERR(usb20_clk)) {
+		pr_err("could not get usb20 clk: %ld\n", PTR_ERR(usb20_clk));
+		return;
+	}
+
+	/* The USB 2.O PLL requires that the USB 2.O PSC is enabled as well. */
+	err = clk_prepare_enable(usb20_clk);
+	if (err) {
+		pr_err("failed to enable usb20 clk: %d\n", err);
+		clk_put(usb20_clk);
+		return;
+	}
+
+	/*
+	 * Turn on the USB 2.0 PHY, but just the PLL, and not OTG. The USB 1.1
+	 * host may use the PLL clock without USB 2.0 OTG being used.
+	 */
+	val &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN);
+	val |= CFGCHIP2_PHY_PLLON;
+
+	writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	while (--timeout) {
+		val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+		if (val & CFGCHIP2_PHYCLKGD)
+			goto done;
+		udelay(1);
+	}
+
+	pr_err("Timeout waiting for USB 2.0 PHY clock good\n");
+done:
+	clk_disable_unprepare(usb20_clk);
+	clk_put(usb20_clk);
+}
+
+static void usb20_phy_clk_disable(struct clk *clk)
+{
+	u32 val;
+
+	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+	val |= CFGCHIP2_PHYPWRDN;
+	writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+}
+
+static int usb20_phy_clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	u32 val;
+
+	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	/* Set the mux depending on the parent clock. */
+	if (parent == &usb_refclkin) {
+		val &= ~CFGCHIP2_USB2PHYCLKMUX;
+	} else if (strcmp(parent->name, "pll0_aux_clk") == 0) {
+		val |= CFGCHIP2_USB2PHYCLKMUX;
+	} else {
+		pr_err("Bad parent on USB 2.0 PHY clock\n");
+		return -EINVAL;
+	}
+
+	/* reference frequency also comes from parent clock */
+	val &= ~CFGCHIP2_REFFREQ_MASK;
+	switch (clk_get_rate(parent)) {
+	case 12000000:
+		val |= CFGCHIP2_REFFREQ_12MHZ;
+		break;
+	case 13000000:
+		val |= CFGCHIP2_REFFREQ_13MHZ;
+		break;
+	case 19200000:
+		val |= CFGCHIP2_REFFREQ_19_2MHZ;
+		break;
+	case 20000000:
+		val |= CFGCHIP2_REFFREQ_20MHZ;
+		break;
+	case 24000000:
+		val |= CFGCHIP2_REFFREQ_24MHZ;
+		break;
+	case 26000000:
+		val |= CFGCHIP2_REFFREQ_26MHZ;
+		break;
+	case 38400000:
+		val |= CFGCHIP2_REFFREQ_38_4MHZ;
+		break;
+	case 40000000:
+		val |= CFGCHIP2_REFFREQ_40MHZ;
+		break;
+	case 48000000:
+		val |= CFGCHIP2_REFFREQ_48MHZ;
+		break;
+	default:
+		pr_err("Bad parent clock rate on USB 2.0 PHY clock\n");
+		return -EINVAL;
+	}
+
+	writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	return 0;
+}
+
+static struct clk usb20_phy_clk = {
+	.name		= "usb20_phy",
+	.clk_enable	= usb20_phy_clk_enable,
+	.clk_disable	= usb20_phy_clk_disable,
+	.set_parent	= usb20_phy_clk_set_parent,
+};
+
+static struct clk_lookup usb20_phy_clk_lookup =
+	CLK("da8xx-usb-phy", "usb20_phy", &usb20_phy_clk);
+
+/**
+ * da8xx_register_usb20_phy_clk - register USB0PHYCLKMUX clock
+ *
+ * @use_usb_refclkin: Selects the parent clock - either "usb_refclkin" if true
+ *	or "pll0_aux" if false.
+ */
+int __init da8xx_register_usb20_phy_clk(bool use_usb_refclkin)
+{
+	struct clk *parent;
+	int ret = 0;
+
+	parent = clk_get(NULL, use_usb_refclkin ? "usb_refclkin" : "pll0_aux");
+	if (IS_ERR(parent))
+		return PTR_ERR(parent);
+
+	usb20_phy_clk.parent = parent;
+	ret = clk_register(&usb20_phy_clk);
+	if (!ret)
+		clkdev_add(&usb20_phy_clk_lookup);
+
+	clk_put(parent);
+
+	return ret;
+}
+
+static int usb11_phy_clk_set_parent(struct clk *clk, struct clk *parent)
+{
+	u32 val;
+
+	val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	/* Set the USB 1.1 PHY clock mux based on the parent clock. */
+	if (parent == &usb20_phy_clk) {
+		val &= ~CFGCHIP2_USB1PHYCLKMUX;
+	} else if (parent == &usb_refclkin) {
+		val |= CFGCHIP2_USB1PHYCLKMUX;
+	} else {
+		pr_err("Bad parent on USB 1.1 PHY clock\n");
+		return -EINVAL;
+	}
+
+	writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
+
+	return 0;
+}
+
+static struct clk usb11_phy_clk = {
+	.name		= "usb11_phy",
+	.set_parent	= usb11_phy_clk_set_parent,
+};
+
+static struct clk_lookup usb11_phy_clk_lookup =
+	CLK("da8xx-usb-phy", "usb11_phy", &usb11_phy_clk);
+
+/**
+ * da8xx_register_usb11_phy_clk - register USB1PHYCLKMUX clock
+ *
+ * @use_usb_refclkin: Selects the parent clock - either "usb_refclkin" if true
+ *	or "usb20_phy" if false.
+ */
+int __init da8xx_register_usb11_phy_clk(bool use_usb_refclkin)
+{
+	struct clk *parent;
+	int ret = 0;
+
+	if (use_usb_refclkin)
+		parent = clk_get(NULL, "usb_refclkin");
+	else
+		parent = clk_get(&da8xx_usb_phy.dev, "usb20_phy");
+	if (IS_ERR(parent))
+		return PTR_ERR(parent);
+
+	usb11_phy_clk.parent = parent;
+	ret = clk_register(&usb11_phy_clk);
+	if (!ret)
+		clkdev_add(&usb11_phy_clk_lookup);
+
+	clk_put(parent);
+
+	return ret;
+}
-- 
2.7.4

[PATCH v7 4/4] ARM: davinci: da8xx: register USB PHY clocks in the DT file

[David Lechner]

From: Axel Haslam <ahaslam@baylibre.com>

The usb20_phy clock needs to be registered for the driver to be able
to get and enable a clock. Currently the usb phy clocks are registered
form board files, which will not be called during a device tree based
boot.

To be able to probe correctly usb form a device tree boot, register
the usb phy clocks form the DT specific init.

Unfortunately, davinci does not have proper clock support on device tree
yet, so by registering the clock form de DT specific file we are
forced to hardcode the parent clock, and cannot select refclkin as
parent for any of the phy clocks of the da850 family.

As none of the current da850 based boards currently in mainline use
refclkin as source. I guess we can live with this limitation until clocks
are correctly represented through CCF/device tree.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
[Added error checking]
Signed-off-by: David Lechner <david@lechnology.com>
---

This patch was recently submitted separately. I added error checking and I am
including it in this series since it is closely related. It could be combined
with the "ARM: davinci: da8xx: add usb phy clocks" patch, but I think it is
good to have a separate commit for the explanation in the commit message.


 arch/arm/mach-davinci/da8xx-dt.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
index 75e831d..839f8db 100644
--- a/arch/arm/mach-davinci/da8xx-dt.c
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -49,6 +49,17 @@ static struct of_dev_auxdata da850_auxdata_lookup[] __initdata = {
 
 static void __init da850_init_machine(void)
 {
+	int ret;
+
+	ret = da8xx_register_usb20_phy_clk(false);
+	if (ret)
+		pr_warn("%s: registering USB 2.0 PHY clock failed: %d",
+			__func__, ret);
+	ret = da8xx_register_usb11_phy_clk(false);
+	if (ret)
+		pr_warn("%s: registering USB 1.1 PHY clock failed: %d",
+			__func__, ret);
+
 	of_platform_default_populate(NULL, da850_auxdata_lookup, NULL);
 }
 
-- 
2.7.4

[PATCH v7 4/4] ARM: davinci: da8xx: register USB PHY clocks in the DT file

[David Lechner]

From: Axel Haslam <ahaslam@baylibre.com>

The usb20_phy clock needs to be registered for the driver to be able
to get and enable a clock. Currently the usb phy clocks are registered
form board files, which will not be called during a device tree based
boot.

To be able to probe correctly usb form a device tree boot, register
the usb phy clocks form the DT specific init.

Unfortunately, davinci does not have proper clock support on device tree
yet, so by registering the clock form de DT specific file we are
forced to hardcode the parent clock, and cannot select refclkin as
parent for any of the phy clocks of the da850 family.

As none of the current da850 based boards currently in mainline use
refclkin as source. I guess we can live with this limitation until clocks
are correctly represented through CCF/device tree.

Signed-off-by: Axel Haslam <ahaslam@baylibre.com>
[Added error checking]
Signed-off-by: David Lechner <david@lechnology.com>
---

This patch was recently submitted separately. I added error checking and I am
including it in this series since it is closely related. It could be combined
with the "ARM: davinci: da8xx: add usb phy clocks" patch, but I think it is
good to have a separate commit for the explanation in the commit message.


 arch/arm/mach-davinci/da8xx-dt.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm/mach-davinci/da8xx-dt.c b/arch/arm/mach-davinci/da8xx-dt.c
index 75e831d..839f8db 100644
--- a/arch/arm/mach-davinci/da8xx-dt.c
+++ b/arch/arm/mach-davinci/da8xx-dt.c
@@ -49,6 +49,17 @@ static struct of_dev_auxdata da850_auxdata_lookup[] __initdata = {
 
 static void __init da850_init_machine(void)
 {
+	int ret;
+
+	ret = da8xx_register_usb20_phy_clk(false);
+	if (ret)
+		pr_warn("%s: registering USB 2.0 PHY clock failed: %d",
+			__func__, ret);
+	ret = da8xx_register_usb11_phy_clk(false);
+	if (ret)
+		pr_warn("%s: registering USB 1.1 PHY clock failed: %d",
+			__func__, ret);
+
 	of_platform_default_populate(NULL, da850_auxdata_lookup, NULL);
 }
 
-- 
2.7.4

Re: [PATCH v7 0/4] da8xx USB PHY platform devices and clocks

[Sekhar Nori]

On Thursday 27 October 2016 05:48 AM, David Lechner wrote:
> This series depends on [v3] ARM: davinci: da8xx: Fix some redefined symbol
> warnings <https://patchwork.kernel.org/patch/9397005/> being applied first.
> 
> v7 changes:
> * Dropped patches that have been accepted into linux-davinci already
> * New patch for adding device names to clock lookup tables
> * Picked up related patch from Axel Haslam for registering USB PHY clocks on
>   device tree boards and added error checking to to that patch
> * Rebased on latest linux-davinci + linux-next
> * Added devices instead of NULL in clk_get() where appropriate usb-da8xx.c
> * Re-ordered patches so that they apply/build cleanly

The series looks good to me now. Since this is considerable change from
previous version, I will wait a while to see if others have any comments
before applying this.

Thanks,
Sekhar

[PATCH v7 0/4] da8xx USB PHY platform devices and clocks

[Sekhar Nori]

On Thursday 27 October 2016 05:48 AM, David Lechner wrote:
> This series depends on [v3] ARM: davinci: da8xx: Fix some redefined symbol
> warnings <https://patchwork.kernel.org/patch/9397005/> being applied first.
> 
> v7 changes:
> * Dropped patches that have been accepted into linux-davinci already
> * New patch for adding device names to clock lookup tables
> * Picked up related patch from Axel Haslam for registering USB PHY clocks on
>   device tree boards and added error checking to to that patch
> * Rebased on latest linux-davinci + linux-next
> * Added devices instead of NULL in clk_get() where appropriate usb-da8xx.c
> * Re-ordered patches so that they apply/build cleanly

The series looks good to me now. Since this is considerable change from
previous version, I will wait a while to see if others have any comments
before applying this.

Thanks,
Sekhar