[RESEND PATCH v3 0/5] usb: change clock information for chipidea

[RESEND PATCH v3 0/5] usb: change clock information for chipidea

[Peter Chen]

This patch set changes usb clock information for legacy i.mx platforms.
At these platforms, they needs three clocks to let controller work.

Hi Shawn,

Fabio has tested for both imx27 and imx25 platforms.
I have queued 1/5 and 5/5, would you please help to queue others,
thanks.

Changes for v3:
- Delete property "needs-three-clocks", and using of_device_id->data
  to differentiate platforms
- change <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v3.19+ to <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v4.1+

Changes for v2:
- Add imx25 & imx27 dts change
- Add Fabio's tested-by and Cc: <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v3.19+
- Some typo and commit description

Peter Chen (5):
  doc: dt-binding: ci-hdrc-usb2: split vendor specific properties
  ARM: dts: imx27.dtsi: change the clock information for usb
  ARM: dts: imx25.dtsi: change the clock information for usb
  ARM: dts: imx35.dtsi: change the clock information for usb
  usb: chipidea: imx: refine clock operations to adapt for all platforms

 .../devicetree/bindings/usb/ci-hdrc-usb2.txt       |  10 +-
 arch/arm/boot/dts/imx25.dtsi                       |   8 +-
 arch/arm/boot/dts/imx27.dtsi                       |  16 ++-
 arch/arm/boot/dts/imx35.dtsi                       |   8 +-
 drivers/usb/chipidea/ci_hdrc_imx.c                 | 156 ++++++++++++++++++---
 5 files changed, 164 insertions(+), 34 deletions(-)

-- 
1.9.1

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[RESEND PATCH v3 1/5] doc: dt-binding: ci-hdrc-usb2: split vendor specific properties

[Peter Chen]

Each vendor may have its specific properties, they are not belonged
to common optional properties, split them from common's.

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Acked-by: Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
---
 Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
index 77946f5..27dc705 100644
--- a/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
+++ b/Documentation/devicetree/bindings/usb/ci-hdrc-usb2.txt
@@ -27,10 +27,6 @@ Optional properties:
 - vbus-supply: reference to the VBUS regulator
 - maximum-speed: limit the maximum connection speed to "full-speed".
 - tpl-support: TPL (Targeted Peripheral List) feature for targeted hosts
-- fsl,usbmisc: (FSL only) phandler of non-core register device, with one
-  argument that indicate usb controller index
-- disable-over-current: (FSL only) disable over current detect
-- external-vbus-divider: (FSL only) enables off-chip resistor divider for Vbus
 - itc-setting: interrupt threshold control register control, the setting
   should be aligned with ITC bits at register USBCMD.
 - ahb-burst-config: it is vendor dependent, the required value should be
@@ -54,6 +50,12 @@ Optional properties:
 - phy-clkgate-delay-us: the delay time (us) between putting the PHY into
   low power mode and gating the PHY clock.
 
+i.mx specific properties
+- fsl,usbmisc: phandler of non-core register device, with one
+  argument that indicate usb controller index
+- disable-over-current: disable over current detect
+- external-vbus-divider: enables off-chip resistor divider for Vbus
+
 Example:
 
 	usb@f7ed0000 {
-- 
1.9.1

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[RESEND PATCH v3 2/5] ARM: dts: imx27.dtsi: change the clock information for usb

[Peter Chen]

For imx27, it needs three clocks to let the controller work,
the old code is wrong, and usbmisc has not included clock handling
code any more. Without this patch, it will cause below data
abort when accessing usbmisc registers.

usbcore: registered new interface driver usb-storage
Unhandled fault: external abort on non-linefetch (0x008) at 0xf4424600
pgd = c0004000
[f4424600] *pgd=10000452(bad)
Internal error: : 8 [#1] PREEMPT ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.1.0-next-20150701-dirty #3089
Hardware name: Freescale i.MX27 (Device Tree Support)
task: c7832b60 ti: c783e000 task.ti: c783e000
PC is at usbmisc_imx27_init+0x4c/0xbc
LR is at usbmisc_imx27_init+0x40/0xbc
pc : [<c03cb5c0>]    lr : [<c03cb5b4>]    psr: 60000093
sp : c783fe08  ip : 00000000  fp : 00000000
r10: c0576434  r9 : 0000009c  r8 : c7a773a0
r7 : 01000000  r6 : 60000013  r5 : c7a776f0  r4 : c7a773f0
r3 : f4424600  r2 : 00000000  r1 : 00000001  r0 : 00000001
Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
Control: 0005317f  Table: a0004000  DAC: 00000017
Process swapper (pid: 1, stack limit = 0xc783e190)
Stack: (0xc783fe08 to 0xc7840000)

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Reported-by: Fabio Estevam <fabio.estevam-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Tested-by: Fabio Estevam <fabio.estevam-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Cc: <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v4.1+
---
 arch/arm/boot/dts/imx27.dtsi | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/imx27.dtsi b/arch/arm/boot/dts/imx27.dtsi
index feb9d34..f818ea4 100644
--- a/arch/arm/boot/dts/imx27.dtsi
+++ b/arch/arm/boot/dts/imx27.dtsi
@@ -486,7 +486,10 @@
 				compatible = "fsl,imx27-usb";
 				reg = <0x10024000 0x200>;
 				interrupts = <56>;
-				clocks = <&clks IMX27_CLK_USB_IPG_GATE>;
+				clocks = <&clks IMX27_CLK_USB_IPG_GATE>,
+					<&clks IMX27_CLK_USB_AHB_GATE>,
+					<&clks IMX27_CLK_USB_DIV>;
+				clock-names = "ipg", "ahb", "per";
 				fsl,usbmisc = <&usbmisc 0>;
 				status = "disabled";
 			};
@@ -495,7 +498,10 @@
 				compatible = "fsl,imx27-usb";
 				reg = <0x10024200 0x200>;
 				interrupts = <54>;
-				clocks = <&clks IMX27_CLK_USB_IPG_GATE>;
+				clocks = <&clks IMX27_CLK_USB_IPG_GATE>,
+					<&clks IMX27_CLK_USB_AHB_GATE>,
+					<&clks IMX27_CLK_USB_DIV>;
+				clock-names = "ipg", "ahb", "per";
 				fsl,usbmisc = <&usbmisc 1>;
 				dr_mode = "host";
 				status = "disabled";
@@ -505,7 +511,10 @@
 				compatible = "fsl,imx27-usb";
 				reg = <0x10024400 0x200>;
 				interrupts = <55>;
-				clocks = <&clks IMX27_CLK_USB_IPG_GATE>;
+				clocks = <&clks IMX27_CLK_USB_IPG_GATE>,
+					<&clks IMX27_CLK_USB_AHB_GATE>,
+					<&clks IMX27_CLK_USB_DIV>;
+				clock-names = "ipg", "ahb", "per";
 				fsl,usbmisc = <&usbmisc 2>;
 				dr_mode = "host";
 				status = "disabled";
@@ -515,7 +524,6 @@
 				#index-cells = <1>;
 				compatible = "fsl,imx27-usbmisc";
 				reg = <0x10024600 0x200>;
-				clocks = <&clks IMX27_CLK_USB_AHB_GATE>;
 			};
 
 			sahara2: sahara@10025000 {
-- 
1.9.1

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[RESEND PATCH v3 3/5] ARM: dts: imx25.dtsi: change the clock information for usb

[Peter Chen]

For imx25, it needs three clocks to let the controller work,
the old code is wrong, and usbmisc has not included clock
handling code any more.

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 arch/arm/boot/dts/imx25.dtsi | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/imx25.dtsi b/arch/arm/boot/dts/imx25.dtsi
index 677f81d..ab843bd 100644
--- a/arch/arm/boot/dts/imx25.dtsi
+++ b/arch/arm/boot/dts/imx25.dtsi
@@ -493,7 +493,8 @@
 				compatible = "fsl,imx25-usb", "fsl,imx27-usb";
 				reg = <0x53ff4000 0x0200>;
 				interrupts = <37>;
-				clocks = <&clks 70>;
+				clocks = <&clks 9>, <&clks 70>, <&clks 8>;
+				clock-names = "ipg", "ahb", "per";
 				fsl,usbmisc = <&usbmisc 0>;
 				fsl,usbphy = <&usbphy0>;
 				status = "disabled";
@@ -503,7 +504,8 @@
 				compatible = "fsl,imx25-usb", "fsl,imx27-usb";
 				reg = <0x53ff4400 0x0200>;
 				interrupts = <35>;
-				clocks = <&clks 70>;
+				clocks = <&clks 9>, <&clks 70>, <&clks 8>;
+				clock-names = "ipg", "ahb", "per";
 				fsl,usbmisc = <&usbmisc 1>;
 				fsl,usbphy = <&usbphy1>;
 				status = "disabled";
@@ -512,8 +514,6 @@
 			usbmisc: usbmisc@53ff4600 {
 				#index-cells = <1>;
 				compatible = "fsl,imx25-usbmisc";
-				clocks = <&clks 9>, <&clks 70>, <&clks 8>;
-				clock-names = "ipg", "ahb", "per";
 				reg = <0x53ff4600 0x00f>;
 			};
 
-- 
1.9.1

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[RESEND PATCH v3 4/5] ARM: dts: imx35.dtsi: change the clock information for usb

[Peter Chen]

For imx35, it needs three clocks to let the controller work,
the old code is wrong, and the usbmisc does not include
clock handling code any more.

Signed-off-by: Peter Chen <peter.chen-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
---
 arch/arm/boot/dts/imx35.dtsi | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/imx35.dtsi b/arch/arm/boot/dts/imx35.dtsi
index e6540b5..5b887d0 100644
--- a/arch/arm/boot/dts/imx35.dtsi
+++ b/arch/arm/boot/dts/imx35.dtsi
@@ -305,7 +305,8 @@
 				compatible = "fsl,imx35-usb", "fsl,imx27-usb";
 				reg = <0x53ff4000 0x0200>;
 				interrupts = <37>;
-				clocks = <&clks 73>;
+				clocks = <&clks 9>, <&clks 73>, <&clks 28>;
+				clock-names = "ipg", "ahb", "per";
 				fsl,usbmisc = <&usbmisc 0>;
 				fsl,usbphy = <&usbphy0>;
 				status = "disabled";
@@ -315,7 +316,8 @@
 				compatible = "fsl,imx35-usb", "fsl,imx27-usb";
 				reg = <0x53ff4400 0x0200>;
 				interrupts = <35>;
-				clocks = <&clks 73>;
+				clocks = <&clks 9>, <&clks 73>, <&clks 28>;
+				clock-names = "ipg", "ahb", "per";
 				fsl,usbmisc = <&usbmisc 1>;
 				fsl,usbphy = <&usbphy1>;
 				dr_mode = "host";
@@ -325,8 +327,6 @@
 			usbmisc: usbmisc@53ff4600 {
 				#index-cells = <1>;
 				compatible = "fsl,imx35-usbmisc";
-				clocks = <&clks 9>, <&clks 73>, <&clks 28>;
-				clock-names = "ipg", "ahb", "per";
 				reg = <0x53ff4600 0x00f>;
 			};
 		};
-- 
1.9.1

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[RESEND PATCH v3 5/5] usb: chipidea: imx: refine clock operations to adapt for all platforms

[Peter Chen]

Some i.mx platforms need three clocks to let controller work, but
others only need one, refine clock operation to adapt for all
platforms, it fixes a regression found at i.mx27.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Tested-by: Fabio Estevam <fabio.estevam@freescale.com>
Cc: <stable@vger.kernel.org> #v4.1+
---
 drivers/usb/chipidea/ci_hdrc_imx.c | 156 ++++++++++++++++++++++++++++++++-----
 1 file changed, 138 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/chipidea/ci_hdrc_imx.c b/drivers/usb/chipidea/ci_hdrc_imx.c
index 6ccbf60..6ec0fbc 100644
--- a/drivers/usb/chipidea/ci_hdrc_imx.c
+++ b/drivers/usb/chipidea/ci_hdrc_imx.c
@@ -32,6 +32,10 @@ static const struct ci_hdrc_imx_platform_flag imx27_usb_data = {
 		CI_HDRC_DISABLE_STREAMING,
 };
 
+static const struct ci_hdrc_imx_platform_flag imx31_usb_data = {
+		CI_HDRC_DISABLE_STREAMING,
+};
+
 static const struct ci_hdrc_imx_platform_flag imx28_usb_data = {
 	.flags = CI_HDRC_IMX28_WRITE_FIX |
 		CI_HDRC_TURN_VBUS_EARLY_ON |
@@ -68,6 +72,13 @@ static const struct ci_hdrc_imx_platform_flag imx7d_usb_data = {
 static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
 	{ .compatible = "fsl,imx28-usb", .data = &imx28_usb_data},
 	{ .compatible = "fsl,imx27-usb", .data = &imx27_usb_data},
+	{ .compatible = "fsl,imx25-usb", .data = &imx27_usb_data},
+	{ .compatible = "fsl,imx35-usb", .data = &imx27_usb_data},
+	{ .compatible = "fsl,imx23-usb", .data = &imx31_usb_data},
+	{ .compatible = "fsl,imx31-usb", .data = &imx31_usb_data},
+	{ .compatible = "fsl,imx50-usb", .data = &imx31_usb_data},
+	{ .compatible = "fsl,imx51-usb", .data = &imx31_usb_data},
+	{ .compatible = "fsl,imx53-usb", .data = &imx31_usb_data},
 	{ .compatible = "fsl,imx6q-usb", .data = &imx6q_usb_data},
 	{ .compatible = "fsl,imx6sl-usb", .data = &imx6sl_usb_data},
 	{ .compatible = "fsl,imx6sx-usb", .data = &imx6sx_usb_data},
@@ -77,6 +88,15 @@ static const struct of_device_id ci_hdrc_imx_dt_ids[] = {
 };
 MODULE_DEVICE_TABLE(of, ci_hdrc_imx_dt_ids);
 
+static inline bool imx_needs_three_clocks
+	(const struct ci_hdrc_imx_platform_flag *imx_platform_flag)
+{
+	if (imx_platform_flag == &imx27_usb_data)
+		return true;
+
+	return false;
+}
+
 struct ci_hdrc_imx_data {
 	struct usb_phy *phy;
 	struct platform_device *ci_pdev;
@@ -84,6 +104,12 @@ struct ci_hdrc_imx_data {
 	struct imx_usbmisc_data *usbmisc_data;
 	bool supports_runtime_pm;
 	bool in_lpm;
+	/* SoC before i.mx6 (except imx23/imx28) needs three clks */
+	bool need_three_clks;
+	struct clk *clk_ipg;
+	struct clk *clk_ahb;
+	struct clk *clk_per;
+	/* --------------------------------- */
 };
 
 /* Common functions shared by usbmisc drivers */
@@ -135,6 +161,105 @@ static struct imx_usbmisc_data *usbmisc_get_init_data(struct device *dev)
 }
 
 /* End of common functions shared by usbmisc drivers*/
+static int imx_get_clks(struct device *dev)
+{
+	struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (data->need_three_clks) {
+		data->clk_ipg = devm_clk_get(dev, "ipg");
+		if (IS_ERR(data->clk_ipg)) {
+			ret = PTR_ERR(data->clk_ipg);
+			dev_err(dev,
+				"Failed to get ipg clock, err=%d\n", ret);
+			return ret;
+		}
+
+		data->clk_ahb = devm_clk_get(dev, "ahb");
+		if (IS_ERR(data->clk_ahb)) {
+			ret = PTR_ERR(data->clk_ahb);
+			dev_err(dev,
+				"Failed to get ahb clock, err=%d\n", ret);
+			return ret;
+		}
+
+		data->clk_per = devm_clk_get(dev, "per");
+		if (IS_ERR(data->clk_per)) {
+			ret = PTR_ERR(data->clk_per);
+			dev_err(dev,
+				"Failed to get per clock, err=%d\n", ret);
+			return ret;
+		}
+	} else {
+		data->clk = devm_clk_get(dev, NULL);
+		if (IS_ERR(data->clk)) {
+			ret = PTR_ERR(data->clk);
+			dev_err(dev,
+				"Failed to get clock, err=%d\n", ret);
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+static int imx_prepare_enable_clks(struct device *dev)
+{
+	struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
+	int ret = 0;
+
+	if (data->need_three_clks) {
+		ret = clk_prepare_enable(data->clk_ipg);
+		if (ret) {
+			dev_err(dev,
+				"Failed to prepare/enable ipg clk, err=%d\n",
+				ret);
+			return ret;
+		}
+
+		ret = clk_prepare_enable(data->clk_ahb);
+		if (ret) {
+			dev_err(dev,
+				"Failed to prepare/enable ahb clk, err=%d\n",
+				ret);
+			clk_disable_unprepare(data->clk_ipg);
+			return ret;
+		}
+
+		ret = clk_prepare_enable(data->clk_per);
+		if (ret) {
+			dev_err(dev,
+				"Failed to prepare/enable per clk, err=%d\n",
+				ret);
+			clk_disable_unprepare(data->clk_ahb);
+			clk_disable_unprepare(data->clk_ipg);
+			return ret;
+		}
+	} else {
+		ret = clk_prepare_enable(data->clk);
+		if (ret) {
+			dev_err(dev,
+				"Failed to prepare/enable clk, err=%d\n",
+				ret);
+			return ret;
+		}
+	}
+
+	return ret;
+}
+
+static void imx_disable_unprepare_clks(struct device *dev)
+{
+	struct ci_hdrc_imx_data *data = dev_get_drvdata(dev);
+
+	if (data->need_three_clks) {
+		clk_disable_unprepare(data->clk_per);
+		clk_disable_unprepare(data->clk_ipg);
+		clk_disable_unprepare(data->clk_ahb);
+	} else {
+		clk_disable_unprepare(data->clk);
+	}
+}
 
 static int ci_hdrc_imx_probe(struct platform_device *pdev)
 {
@@ -153,23 +278,20 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 	if (!data)
 		return -ENOMEM;
 
+	platform_set_drvdata(pdev, data);
 	data->usbmisc_data = usbmisc_get_init_data(&pdev->dev);
 	if (IS_ERR(data->usbmisc_data))
 		return PTR_ERR(data->usbmisc_data);
 
-	data->clk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(data->clk)) {
-		dev_err(&pdev->dev,
-			"Failed to get clock, err=%ld\n", PTR_ERR(data->clk));
-		return PTR_ERR(data->clk);
-	}
+	data->need_three_clks = imx_needs_three_clocks(imx_platform_flag);
 
-	ret = clk_prepare_enable(data->clk);
-	if (ret) {
-		dev_err(&pdev->dev,
-			"Failed to prepare or enable clock, err=%d\n", ret);
+	ret = imx_get_clks(&pdev->dev);
+	if (ret)
+		return ret;
+
+	ret = imx_prepare_enable_clks(&pdev->dev);
+	if (ret)
 		return ret;
-	}
 
 	data->phy = devm_usb_get_phy_by_phandle(&pdev->dev, "fsl,usbphy", 0);
 	if (IS_ERR(data->phy)) {
@@ -212,8 +334,6 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 		goto disable_device;
 	}
 
-	platform_set_drvdata(pdev, data);
-
 	if (data->supports_runtime_pm) {
 		pm_runtime_set_active(&pdev->dev);
 		pm_runtime_enable(&pdev->dev);
@@ -226,7 +346,7 @@ static int ci_hdrc_imx_probe(struct platform_device *pdev)
 disable_device:
 	ci_hdrc_remove_device(data->ci_pdev);
 err_clk:
-	clk_disable_unprepare(data->clk);
+	imx_disable_unprepare_clks(&pdev->dev);
 	return ret;
 }
 
@@ -240,7 +360,7 @@ static int ci_hdrc_imx_remove(struct platform_device *pdev)
 		pm_runtime_put_noidle(&pdev->dev);
 	}
 	ci_hdrc_remove_device(data->ci_pdev);
-	clk_disable_unprepare(data->clk);
+	imx_disable_unprepare_clks(&pdev->dev);
 
 	return 0;
 }
@@ -252,7 +372,7 @@ static int imx_controller_suspend(struct device *dev)
 
 	dev_dbg(dev, "at %s\n", __func__);
 
-	clk_disable_unprepare(data->clk);
+	imx_disable_unprepare_clks(dev);
 	data->in_lpm = true;
 
 	return 0;
@@ -270,7 +390,7 @@ static int imx_controller_resume(struct device *dev)
 		return 0;
 	}
 
-	ret = clk_prepare_enable(data->clk);
+	ret = imx_prepare_enable_clks(dev);
 	if (ret)
 		return ret;
 
@@ -285,7 +405,7 @@ static int imx_controller_resume(struct device *dev)
 	return 0;
 
 clk_disable:
-	clk_disable_unprepare(data->clk);
+	imx_disable_unprepare_clks(dev);
 	return ret;
 }
 
-- 
1.9.1

Re: [RESEND PATCH v3 0/5] usb: change clock information for chipidea

[Shawn Guo]

On Wed, Sep 30, 2015 at 10:25:20AM +0800, Peter Chen wrote:
> This patch set changes usb clock information for legacy i.mx platforms.
> At these platforms, they needs three clocks to let controller work.
> 
> Hi Shawn,
> 
> Fabio has tested for both imx27 and imx25 platforms.
> I have queued 1/5 and 5/5, would you please help to queue others,
> thanks.
> 
> Changes for v3:
> - Delete property "needs-three-clocks", and using of_device_id->data
>   to differentiate platforms
> - change <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v3.19+ to <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v4.1+

So the last patch will be sent as a fix with stable on copy?  In that
case, will USB driver just work without corresponding DTS change?  Or
the driver change has a dependency on the DTS change?

Shawn

> 
> Changes for v2:
> - Add imx25 & imx27 dts change
> - Add Fabio's tested-by and Cc: <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v3.19+
> - Some typo and commit description
> 
> Peter Chen (5):
>   doc: dt-binding: ci-hdrc-usb2: split vendor specific properties
>   ARM: dts: imx27.dtsi: change the clock information for usb
>   ARM: dts: imx25.dtsi: change the clock information for usb
>   ARM: dts: imx35.dtsi: change the clock information for usb
>   usb: chipidea: imx: refine clock operations to adapt for all platforms
> 
>  .../devicetree/bindings/usb/ci-hdrc-usb2.txt       |  10 +-
>  arch/arm/boot/dts/imx25.dtsi                       |   8 +-
>  arch/arm/boot/dts/imx27.dtsi                       |  16 ++-
>  arch/arm/boot/dts/imx35.dtsi                       |   8 +-
>  drivers/usb/chipidea/ci_hdrc_imx.c                 | 156 ++++++++++++++++++---
>  5 files changed, 164 insertions(+), 34 deletions(-)
> 
> -- 
> 1.9.1
> 
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Re: [RESEND PATCH v3 0/5] usb: change clock information for chipidea

[Peter Chen]

On Wed, Sep 30, 2015 at 01:28:36PM +0800, Shawn Guo wrote:
> On Wed, Sep 30, 2015 at 10:25:20AM +0800, Peter Chen wrote:
> > This patch set changes usb clock information for legacy i.mx platforms.
> > At these platforms, they needs three clocks to let controller work.
> > 
> > Hi Shawn,
> > 
> > Fabio has tested for both imx27 and imx25 platforms.
> > I have queued 1/5 and 5/5, would you please help to queue others,
> > thanks.
> > 
> > Changes for v3:
> > - Delete property "needs-three-clocks", and using of_device_id->data
> >   to differentiate platforms
> > - change <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v3.19+ to <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v4.1+
> 
> So the last patch will be sent as a fix with stable on copy?

Yes

> In that
> case, will USB driver just work without corresponding DTS change?  Or
> the driver change has a dependency on the DTS change?
> 

At v4.1, One of USB driver changes break i.mx27's USB function.
The driver's change at patch 5/5 is also tagged for stable tree,
so it needs both DTS and driver's change to let i.mx27 USB work from
v4.1.

-- 

Best Regards,
Peter Chen
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Re: [RESEND PATCH v3 0/5] usb: change clock information for chipidea

[Shawn Guo]

On Wed, Sep 30, 2015 at 02:24:28PM +0800, Peter Chen wrote:
> On Wed, Sep 30, 2015 at 01:28:36PM +0800, Shawn Guo wrote:
> > On Wed, Sep 30, 2015 at 10:25:20AM +0800, Peter Chen wrote:
> > > This patch set changes usb clock information for legacy i.mx platforms.
> > > At these platforms, they needs three clocks to let controller work.
> > > 
> > > Hi Shawn,
> > > 
> > > Fabio has tested for both imx27 and imx25 platforms.
> > > I have queued 1/5 and 5/5, would you please help to queue others,
> > > thanks.
> > > 
> > > Changes for v3:
> > > - Delete property "needs-three-clocks", and using of_device_id->data
> > >   to differentiate platforms
> > > - change <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v3.19+ to <stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org> #v4.1+
> > 
> > So the last patch will be sent as a fix with stable on copy?
> 
> Yes
> 
> > In that
> > case, will USB driver just work without corresponding DTS change?  Or
> > the driver change has a dependency on the DTS change?
> > 
> 
> At v4.1, One of USB driver changes break i.mx27's USB function.
> The driver's change at patch 5/5 is also tagged for stable tree,
> so it needs both DTS and driver's change to let i.mx27 USB work from
> v4.1.

In that case, you need to have dts and driver changes go through the
same tree.  For dts patches, you can have

Acked-by: Shawn Guo <shawnguo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>

As a side note, the kernel change breaks the ABI with DT anyway.

Shawn
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