[PATCH v3 0/3] dts: imx8qxp add cdns usb3 port

[PATCH v3 0/3] dts: imx8qxp add cdns usb3 port

[Frank Li]

cdns driver code already upstreamed. but missed dts part.

Change from v2 to v3:
1. drop fixed frequency clock binding

Change from v1 to v2:
1. Add binding docoument.
2. Fixed all shawn's comments

Frank Li (3):
  dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings
  arm64: dts: imx8qxp: add cadence usb3 support
  arm64: dts: freescale: imx8qxp-mek: enable cadence usb3

 .../bindings/usb/fsl,imx8qm-cdns3.yaml        | 122 ++++++++++++++++++
 .../boot/dts/freescale/imx8-ss-conn.dtsi      |  72 +++++++++++
 arch/arm64/boot/dts/freescale/imx8qxp-mek.dts |  85 ++++++++++++
 3 files changed, 279 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml

-- 
2.34.1

[PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Frank Li]

NXP imx8qm integrates 1 cdns3 IP. This is glue layer device bindings.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
Change from v2 to v3
- Drop two fixed frequency clocks, it is system reset value, no need set now.
If need, futher work/discuss on driver or dts change. It will not block this
basic enablement work.
- Drop lable
- Drop some descriptions
- Reg as second property.

Change from v1 to v2.
- new add binding doc

 .../bindings/usb/fsl,imx8qm-cdns3.yaml        | 114 ++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml

diff --git a/Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml b/Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml
new file mode 100644
index 000000000000..d876e3dab608
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml
@@ -0,0 +1,112 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+# Copyright (c) 2020 NXP
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/usb/fsl,imx8qm-cdns3.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NXP iMX8QM Soc USB Controller
+
+maintainers:
+  - Frank Li <Frank.Li@nxp.com>
+
+properties:
+  compatible:
+    const: fsl,imx8qm-usb3
+
+  reg:
+    items:
+      - description: Register set for iMX USB3 Platform Control
+
+  "#address-cells":
+    enum: [ 1, 2 ]
+
+  "#size-cells":
+    enum: [ 1, 2 ]
+
+  ranges: true
+
+  clocks:
+    items:
+      - description: Standby clock. Used during ultra low power states.
+      - description: USB bus clock for usb3 controller.
+      - description: AXI clock for AXI interface.
+      - description: ipg clock for register access.
+      - description: Core clock for usb3 controller.
+
+  clock-names:
+    items:
+      - const: usb3_lpm_clk
+      - const: usb3_bus_clk
+      - const: usb3_aclk
+      - const: usb3_ipg_clk
+      - const: usb3_core_pclk
+
+  assigned-clocks:
+    items:
+      - description: Phandle and clock specifoer of IMX_SC_PM_CLK_MST_BUS.
+
+  assigned-clock-rates:
+    items:
+      - description: Should be in Range 100 - 600 Mhz.
+
+  power-domains:
+    maxItems: 1
+
+# Required child node:
+
+patternProperties:
+  "^usb@[0-9a-f]+$":
+    $ref: cdns,usb3.yaml#
+
+required:
+  - compatible
+  - reg
+  - "#address-cells"
+  - "#size-cells"
+  - ranges
+  - clocks
+  - clock-names
+  - power-domains
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8-lpcg.h>
+    #include <dt-bindings/firmware/imx/rsrc.h>
+    #include <dt-bindings/interrupt-controller/arm-gic.h>
+
+    usb@5b110000 {
+      compatible = "fsl,imx8qm-usb3";
+      reg = <0x5b110000 0x10000>;
+      ranges;
+      clocks = <&usb3_lpcg IMX_LPCG_CLK_1>,
+               <&usb3_lpcg IMX_LPCG_CLK_0>,
+               <&usb3_lpcg IMX_LPCG_CLK_7>,
+               <&usb3_lpcg IMX_LPCG_CLK_4>,
+               <&usb3_lpcg IMX_LPCG_CLK_5>;
+      clock-names = "usb3_lpm_clk", "usb3_bus_clk", "usb3_aclk",
+                    "usb3_ipg_clk", "usb3_core_pclk";
+      assigned-clocks = <&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_MST_BUS>;
+      assigned-clock-rates = <250000000>;
+      power-domains = <&pd IMX_SC_R_USB_2>;
+      #address-cells = <1>;
+      #size-cells = <1>;
+
+      usb@5b120000 {
+        compatible = "cdns,usb3";
+        reg = <0x5b120000 0x10000>,   /* memory area for OTG/DRD registers */
+              <0x5b130000 0x10000>,   /* memory area for HOST registers */
+              <0x5b140000 0x10000>;   /* memory area for DEVICE registers */
+        reg-names = "otg", "xhci", "dev";
+        interrupt-parent = <&gic>;
+        interrupts = <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
+                     <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-names = "host", "peripheral", "otg", "wakeup";
+        phys = <&usb3_phy>;
+        phy-names = "cdns3,usb3-phy";
+      };
+    };
-- 
2.34.1

[PATCH v3 2/3] arm64: dts: imx8qxp: add cadence usb3 support

[Frank Li]

There are cadence usb3.0 controller in 8qxp and 8qm.
Add usb3 node at common connect subsystem.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---
Change from v2 to v3:
- Drop fixed frequency clock. See binding doc patch.
- move req as second property
Change from v1 to v2
- fix shawn's comments

 .../boot/dts/freescale/imx8-ss-conn.dtsi      | 70 +++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8-ss-conn.dtsi b/arch/arm64/boot/dts/freescale/imx8-ss-conn.dtsi
index 4852760adeee..a08608312f16 100644
--- a/arch/arm64/boot/dts/freescale/imx8-ss-conn.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8-ss-conn.dtsi
@@ -138,6 +138,54 @@ fec2: ethernet@5b050000 {
 		status = "disabled";
 	};
 
+	usbotg3: usb@5b110000 {
+		compatible = "fsl,imx8qm-usb3";
+		reg = <0x5b110000 0x10000>;
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges;
+		clocks = <&usb3_lpcg IMX_LPCG_CLK_1>,
+			 <&usb3_lpcg IMX_LPCG_CLK_0>,
+			 <&usb3_lpcg IMX_LPCG_CLK_7>,
+			 <&usb3_lpcg IMX_LPCG_CLK_4>,
+			 <&usb3_lpcg IMX_LPCG_CLK_5>;
+		clock-names = "usb3_lpm_clk", "usb3_bus_clk", "usb3_aclk",
+			      "usb3_ipg_clk", "usb3_core_pclk";
+		assigned-clocks = <&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_MST_BUS>;
+		assigned-clock-rates = <250000000>;
+		power-domains = <&pd IMX_SC_R_USB_2>;
+		status = "disabled";
+
+		usbotg3_cdns3: usb@5b120000 {
+			compatible = "cdns,usb3";
+			reg = <0x5b130000 0x10000>,     /* memory area for HOST registers */
+			      <0x5b140000 0x10000>,   /* memory area for DEVICE registers */
+			      <0x5b120000 0x10000>;   /* memory area for OTG/DRD registers */
+			reg-names = "xhci", "dev", "otg";
+			#address-cells = <1>;
+			#size-cells = <1>;
+			interrupt-parent = <&gic>;
+			interrupts = <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>,
+				     <GIC_SPI 271 IRQ_TYPE_LEVEL_HIGH>;
+			interrupt-names = "host", "peripheral", "otg", "wakeup";
+			phys = <&usb3_phy>;
+			phy-names = "cdns3,usb3-phy";
+			status = "disabled";
+		};
+	};
+
+	usb3_phy: usb-phy@5b160000 {
+		compatible = "nxp,salvo-phy";
+		reg = <0x5b160000 0x40000>;
+		clocks = <&usb3_lpcg IMX_LPCG_CLK_6>;
+		clock-names = "salvo_phy_clk";
+		power-domains = <&pd IMX_SC_R_USB_2_PHY>;
+		#phy-cells = <0>;
+		status = "disabled";
+	};
+
 	/* LPCG clocks */
 	sdhc0_lpcg: clock-controller@5b200000 {
 		compatible = "fsl,imx8qxp-lpcg";
@@ -234,4 +282,26 @@ usb2_lpcg: clock-controller@5b270000 {
 		clock-output-names = "usboh3_ahb_clk", "usboh3_phy_ipg_clk";
 		power-domains = <&pd IMX_SC_R_USB_0_PHY>;
 	};
+
+	usb3_lpcg: clock-controller@5b280000 {
+		compatible = "fsl,imx8qxp-lpcg";
+		reg = <0x5b280000 0x10000>;
+		#clock-cells = <1>;
+		clock-indices = <IMX_LPCG_CLK_0>, <IMX_LPCG_CLK_1>,
+				<IMX_LPCG_CLK_4>, <IMX_LPCG_CLK_5>,
+				<IMX_LPCG_CLK_6>, <IMX_LPCG_CLK_7>;
+		clocks = <&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_PER>,
+			 <&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_MISC>,
+			 <&conn_ipg_clk>,
+			 <&conn_ipg_clk>,
+			 <&conn_ipg_clk>,
+			 <&clk IMX_SC_R_USB_2 IMX_SC_PM_CLK_MST_BUS>;
+		clock-output-names = "usb3_app_clk",
+				     "usb3_lpm_clk",
+				     "usb3_ipg_clk",
+				     "usb3_core_pclk",
+				     "usb3_phy_clk",
+				     "usb3_aclk";
+		power-domains = <&pd IMX_SC_R_USB_2_PHY>;
+	};
 };
-- 
2.34.1

[PATCH v3 3/3] arm64: dts: freescale: imx8qxp-mek: enable cadence usb3

[Frank Li]

Enable USB3 controller, phy and typec related nodes.

Signed-off-by: Frank Li <Frank.Li@nxp.com>
---

Change from v2 to v3
-none
Change from v1 to v2
-fix shawn's comments.

 arch/arm64/boot/dts/freescale/imx8qxp-mek.dts | 85 +++++++++++++++++++
 1 file changed, 85 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts b/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts
index afa883389456..9ba4c72f0006 100644
--- a/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts
+++ b/arch/arm64/boot/dts/freescale/imx8qxp-mek.dts
@@ -6,6 +6,7 @@
 /dts-v1/;
 
 #include "imx8qxp.dtsi"
+#include <dt-bindings/usb/pd.h>
 
 / {
 	model = "Freescale i.MX8QXP MEK";
@@ -28,6 +29,21 @@ reg_usdhc2_vmmc: usdhc2-vmmc {
 		gpio = <&lsio_gpio4 19 GPIO_ACTIVE_HIGH>;
 		enable-active-high;
 	};
+
+	gpio-sbu-mux {
+		compatible = "gpio-sbu-mux";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_typec_mux>;
+		select-gpios = <&lsio_gpio5 9 GPIO_ACTIVE_HIGH>;
+		enable-gpios = <&pca9557_a 7 GPIO_ACTIVE_LOW>;
+		orientation-switch;
+
+		port {
+			usb3_data_ss: endpoint {
+				remote-endpoint = <&typec_con_ss>;
+			};
+		};
+	};
 };
 
 &dsp {
@@ -127,6 +143,42 @@ light-sensor@44 {
 			};
 		};
 	};
+
+	ptn5110: tcpc@50 {
+		compatible = "nxp,ptn5110";
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_typec>;
+		reg = <0x50>;
+		interrupt-parent = <&lsio_gpio1>;
+		interrupts = <3 IRQ_TYPE_LEVEL_LOW>;
+
+		port {
+			typec_dr_sw: endpoint {
+				remote-endpoint = <&usb3_drd_sw>;
+			};
+		};
+
+		usb_con1: connector {
+			compatible = "usb-c-connector";
+			label = "USB-C";
+			power-role = "source";
+			data-role = "dual";
+			source-pdos = <PDO_FIXED(5000, 3000, PDO_FIXED_USB_COMM)>;
+
+			ports {
+				#address-cells = <1>;
+				#size-cells = <0>;
+
+				port@1 {
+					reg = <1>;
+					typec_con_ss: endpoint {
+						remote-endpoint = <&usb3_data_ss>;
+					};
+				};
+			};
+		};
+	};
+
 };
 
 &lpuart0 {
@@ -204,6 +256,27 @@ &usdhc2 {
 	status = "okay";
 };
 
+&usb3_phy {
+	status = "okay";
+};
+
+&usbotg3 {
+	status = "okay";
+};
+
+&usbotg3_cdns3 {
+	dr_mode = "otg";
+	usb-role-switch;
+	status = "okay";
+
+	port {
+		usb3_drd_sw: endpoint {
+			remote-endpoint = <&typec_dr_sw>;
+		};
+	};
+};
+
+
 &vpu {
 	compatible = "nxp,imx8qxp-vpu";
 	status = "okay";
@@ -267,6 +340,18 @@ IMX8QXP_UART0_TX_ADMA_UART0_TX				0x06000020
 		>;
 	};
 
+	pinctrl_typec: typecgrp {
+		fsl,pins = <
+			IMX8QXP_SPI2_SCK_LSIO_GPIO1_IO03                        0x06000021
+		>;
+	};
+
+	pinctrl_typec_mux: typecmuxgrp {
+		fsl,pins = <
+			IMX8QXP_ENET0_REFCLK_125M_25M_LSIO_GPIO5_IO09           0x60
+		>;
+	};
+
 	pinctrl_usdhc1: usdhc1grp {
 		fsl,pins = <
 			IMX8QXP_EMMC0_CLK_CONN_EMMC0_CLK			0x06000041
-- 
2.34.1

Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Krzysztof Kozlowski]

On 21/03/2023 16:19, Frank Li wrote:
> NXP imx8qm integrates 1 cdns3 IP. This is glue layer device bindings.
> 
> Signed-off-by: Frank Li <Frank.Li@nxp.com>


Subject is still not fixed.

> ---
> Change from v2 to v3
> - Drop two fixed frequency clocks, it is system reset value, no need set now.
> If need, futher work/discuss on driver or dts change. It will not block this
> basic enablement work.
> - Drop lable
> - Drop some descriptions
> - Reg as second property.
> 
> Change from v1 to v2.
> - new add binding doc
> 
>  .../bindings/usb/fsl,imx8qm-cdns3.yaml        | 114 ++++++++++++++++++
>  1 file changed, 114 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml
> 
> diff --git a/Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml b/Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml
> new file mode 100644
> index 000000000000..d876e3dab608
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/fsl,imx8qm-cdns3.yaml
> @@ -0,0 +1,112 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +# Copyright (c) 2020 NXP
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/fsl,imx8qm-cdns3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP iMX8QM Soc USB Controller
> +
> +maintainers:
> +  - Frank Li <Frank.Li@nxp.com>
> +
> +properties:
> +  compatible:
> +    const: fsl,imx8qm-usb3
> +
> +  reg:
> +    items:
> +      - description: Register set for iMX USB3 Platform Control
> +
> +  "#address-cells":
> +    enum: [ 1, 2 ]
> +
> +  "#size-cells":
> +    enum: [ 1, 2 ]
> +
> +  ranges: true
> +
> +  clocks:
> +    items:
> +      - description: Standby clock. Used during ultra low power states.
> +      - description: USB bus clock for usb3 controller.
> +      - description: AXI clock for AXI interface.
> +      - description: ipg clock for register access.
> +      - description: Core clock for usb3 controller.
> +
> +  clock-names:
> +    items:
> +      - const: usb3_lpm_clk
> +      - const: usb3_bus_clk
> +      - const: usb3_aclk
> +      - const: usb3_ipg_clk
> +      - const: usb3_core_pclk
> +
> +  assigned-clocks:
> +    items:
> +      - description: Phandle and clock specifoer of IMX_SC_PM_CLK_MST_BUS.

Drop useless pieces so "Phandle and clock specifoer of " and name the
hardware, not the syntax.

> +
> +  assigned-clock-rates:
> +    items:
> +      - description: Should be in Range 100 - 600 Mhz.

That's better but I still do not understand why do you need it in the
bindings. You never actually answered this question.

Best regards,
Krzysztof

RE: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Frank Li]

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Sent: Wednesday, March 22, 2023 2:32 AM
> To: Frank Li <frank.li@nxp.
> > +      - const: usb3_aclk
> > +      - const: usb3_ipg_clk
> > +      - const: usb3_core_pclk
> > +
> > +  assigned-clocks:
> > +    items:
> > +      - description: Phandle and clock specifoer of
> IMX_SC_PM_CLK_MST_BUS.
> 
> Drop useless pieces so "Phandle and clock specifoer of " and name the
> hardware, not the syntax.
> 
> > +
> > +  assigned-clock-rates:
> > +    items:
> > +      - description: Should be in Range 100 - 600 Mhz.
> 
> That's better but I still do not understand why do you need it in the
> bindings. You never actually answered this question.

I am not sure 100% sure the reason. 
I think difference system target's  axi bus frequency is difference,   
And just one time work, needn't software to manage it.
Following other driver's code style may be another reason. 

> 
> Best regards,
> Krzysztof

Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Krzysztof Kozlowski]

On 22/03/2023 15:34, Frank Li wrote:
> 
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> Sent: Wednesday, March 22, 2023 2:32 AM
>> To: Frank Li <frank.li@nxp.
>>> +      - const: usb3_aclk
>>> +      - const: usb3_ipg_clk
>>> +      - const: usb3_core_pclk
>>> +
>>> +  assigned-clocks:
>>> +    items:
>>> +      - description: Phandle and clock specifoer of
>> IMX_SC_PM_CLK_MST_BUS.
>>
>> Drop useless pieces so "Phandle and clock specifoer of " and name the
>> hardware, not the syntax.
>>
>>> +
>>> +  assigned-clock-rates:
>>> +    items:
>>> +      - description: Should be in Range 100 - 600 Mhz.
>>
>> That's better but I still do not understand why do you need it in the
>> bindings. You never actually answered this question.
> 
> I am not sure 100% sure the reason. 
> I think difference system target's  axi bus frequency is difference,   
> And just one time work, needn't software to manage it.
> Following other driver's code style may be another reason. 

That's the reason of heaving it in DTS. But I am asking about bindings.
You do understand you define here interface?

Best regards,
Krzysztof

RE: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Frank Li]

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Sent: Wednesday, March 22, 2023 4:32 PM
> To: Frank Li <frank.li@nxp.com>
> Cc: devicetree@vger.kernel.org; festevam@gmail.com; imx@lists.linux.dev;
> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
> shawnguo@kernel.org
> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
> imx8qm cdns3 glue bindings
> 
> Caution: EXT Email
> 
> On 22/03/2023 15:34, Frank Li wrote:
> >
> >
> >> -----Original Message-----
> >> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> >> Sent: Wednesday, March 22, 2023 2:32 AM
> >> To: Frank Li <frank.li@nxp.
> >>> +      - const: usb3_aclk
> >>> +      - const: usb3_ipg_clk
> >>> +      - const: usb3_core_pclk
> >>> +
> >>> +  assigned-clocks:
> >>> +    items:
> >>> +      - description: Phandle and clock specifoer of
> >> IMX_SC_PM_CLK_MST_BUS.
> >>
> >> Drop useless pieces so "Phandle and clock specifoer of " and name the
> >> hardware, not the syntax.
> >>
> >>> +
> >>> +  assigned-clock-rates:
> >>> +    items:
> >>> +      - description: Should be in Range 100 - 600 Mhz.
> >>
> >> That's better but I still do not understand why do you need it in the
> >> bindings. You never actually answered this question.
> >
> > I am not sure 100% sure the reason.
> > I think difference system target's  axi bus frequency is difference,
> > And just one time work, needn't software to manage it.
> > Following other driver's code style may be another reason.
> 
> That's the reason of heaving it in DTS. But I am asking about bindings.
> You do understand you define here interface?

I defined here is descript AXI frequency for usb controller. Supposed difference
Platform will have difference working frequency.  

> 
> Best regards,
> Krzysztof

Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Krzysztof Kozlowski]

On 22/03/2023 22:36, Frank Li wrote:
> 
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> Sent: Wednesday, March 22, 2023 4:32 PM
>> To: Frank Li <frank.li@nxp.com>
>> Cc: devicetree@vger.kernel.org; festevam@gmail.com; imx@lists.linux.dev;
>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
>> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
>> shawnguo@kernel.org
>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
>> imx8qm cdns3 glue bindings
>>
>> Caution: EXT Email
>>
>> On 22/03/2023 15:34, Frank Li wrote:
>>>
>>>
>>>> -----Original Message-----
>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>> Sent: Wednesday, March 22, 2023 2:32 AM
>>>> To: Frank Li <frank.li@nxp.
>>>>> +      - const: usb3_aclk
>>>>> +      - const: usb3_ipg_clk
>>>>> +      - const: usb3_core_pclk
>>>>> +
>>>>> +  assigned-clocks:
>>>>> +    items:
>>>>> +      - description: Phandle and clock specifoer of
>>>> IMX_SC_PM_CLK_MST_BUS.
>>>>
>>>> Drop useless pieces so "Phandle and clock specifoer of " and name the
>>>> hardware, not the syntax.
>>>>
>>>>> +
>>>>> +  assigned-clock-rates:
>>>>> +    items:
>>>>> +      - description: Should be in Range 100 - 600 Mhz.
>>>>
>>>> That's better but I still do not understand why do you need it in the
>>>> bindings. You never actually answered this question.
>>>
>>> I am not sure 100% sure the reason.
>>> I think difference system target's  axi bus frequency is difference,
>>> And just one time work, needn't software to manage it.
>>> Following other driver's code style may be another reason.
>>
>> That's the reason of heaving it in DTS. But I am asking about bindings.
>> You do understand you define here interface?
> 
> I defined here is descript AXI frequency for usb controller. Supposed difference
> Platform will have difference working frequency.  

I don't understand how does this answer my concerns of having it in DT
bindings. If you do not add it, you "will have difference working
frequency", so what's the point?

Best regards,
Krzysztof

RE: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Frank Li]

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Sent: Wednesday, March 22, 2023 4:38 PM
> To: Frank Li <frank.li@nxp.com>
> Cc: devicetree@vger.kernel.org; festevam@gmail.com; imx@lists.linux.dev;
> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
> shawnguo@kernel.org
> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
> imx8qm cdns3 glue bindings
> 
> Caution: EXT Email
> 
> On 22/03/2023 22:36, Frank Li wrote:
> >
> >
> >> -----Original Message-----
> >> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> >> Sent: Wednesday, March 22, 2023 4:32 PM
> >> To: Frank Li <frank.li@nxp.com>
> >> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
> imx@lists.linux.dev;
> >> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
> >> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
> >> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
> >> shawnguo@kernel.org
> >> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
> >> imx8qm cdns3 glue bindings
> >>
> >> Caution: EXT Email
> >>
> >> On 22/03/2023 15:34, Frank Li wrote:
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> >>>> Sent: Wednesday, March 22, 2023 2:32 AM
> >>>> To: Frank Li <frank.li@nxp.
> >>>>> +      - const: usb3_aclk
> >>>>> +      - const: usb3_ipg_clk
> >>>>> +      - const: usb3_core_pclk
> >>>>> +
> >>>>> +  assigned-clocks:
> >>>>> +    items:
> >>>>> +      - description: Phandle and clock specifoer of
> >>>> IMX_SC_PM_CLK_MST_BUS.
> >>>>
> >>>> Drop useless pieces so "Phandle and clock specifoer of " and name the
> >>>> hardware, not the syntax.
> >>>>
> >>>>> +
> >>>>> +  assigned-clock-rates:
> >>>>> +    items:
> >>>>> +      - description: Should be in Range 100 - 600 Mhz.
> >>>>
> >>>> That's better but I still do not understand why do you need it in the
> >>>> bindings. You never actually answered this question.
> >>>
> >>> I am not sure 100% sure the reason.
> >>> I think difference system target's  axi bus frequency is difference,
> >>> And just one time work, needn't software to manage it.
> >>> Following other driver's code style may be another reason.
> >>
> >> That's the reason of heaving it in DTS. But I am asking about bindings.
> >> You do understand you define here interface?
> >
> > I defined here is descript AXI frequency for usb controller. Supposed
> difference
> > Platform will have difference working frequency.
> 
> I don't understand how does this answer my concerns of having it in DT
> bindings. If you do not add it, you "will have difference working
> frequency", so what's the point?

For example: imx8qxp, it need set to 250Mhz,  i.MX8QM need set to 200Mhz.
Maybe future chip can set to 400Mhz.

> 
> Best regards,
> Krzysztof

Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Krzysztof Kozlowski]

On 22/03/2023 22:40, Frank Li wrote:
> 
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> Sent: Wednesday, March 22, 2023 4:38 PM
>> To: Frank Li <frank.li@nxp.com>
>> Cc: devicetree@vger.kernel.org; festevam@gmail.com; imx@lists.linux.dev;
>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
>> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
>> shawnguo@kernel.org
>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
>> imx8qm cdns3 glue bindings
>>
>> Caution: EXT Email
>>
>> On 22/03/2023 22:36, Frank Li wrote:
>>>
>>>
>>>> -----Original Message-----
>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>> Sent: Wednesday, March 22, 2023 4:32 PM
>>>> To: Frank Li <frank.li@nxp.com>
>>>> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
>> imx@lists.linux.dev;
>>>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
>>>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
>>>> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
>>>> shawnguo@kernel.org
>>>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
>>>> imx8qm cdns3 glue bindings
>>>>
>>>> Caution: EXT Email
>>>>
>>>> On 22/03/2023 15:34, Frank Li wrote:
>>>>>
>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>>>> Sent: Wednesday, March 22, 2023 2:32 AM
>>>>>> To: Frank Li <frank.li@nxp.
>>>>>>> +      - const: usb3_aclk
>>>>>>> +      - const: usb3_ipg_clk
>>>>>>> +      - const: usb3_core_pclk
>>>>>>> +
>>>>>>> +  assigned-clocks:
>>>>>>> +    items:
>>>>>>> +      - description: Phandle and clock specifoer of
>>>>>> IMX_SC_PM_CLK_MST_BUS.
>>>>>>
>>>>>> Drop useless pieces so "Phandle and clock specifoer of " and name the
>>>>>> hardware, not the syntax.
>>>>>>
>>>>>>> +
>>>>>>> +  assigned-clock-rates:
>>>>>>> +    items:
>>>>>>> +      - description: Should be in Range 100 - 600 Mhz.
>>>>>>
>>>>>> That's better but I still do not understand why do you need it in the
>>>>>> bindings. You never actually answered this question.
>>>>>
>>>>> I am not sure 100% sure the reason.
>>>>> I think difference system target's  axi bus frequency is difference,
>>>>> And just one time work, needn't software to manage it.
>>>>> Following other driver's code style may be another reason.
>>>>
>>>> That's the reason of heaving it in DTS. But I am asking about bindings.
>>>> You do understand you define here interface?
>>>
>>> I defined here is descript AXI frequency for usb controller. Supposed
>> difference
>>> Platform will have difference working frequency.
>>
>> I don't understand how does this answer my concerns of having it in DT
>> bindings. If you do not add it, you "will have difference working
>> frequency", so what's the point?
> 
> For example: imx8qxp, it need set to 250Mhz,  i.MX8QM need set to 200Mhz.
> Maybe future chip can set to 400Mhz.

And? So as you can see you will still have different frequencies, so
what's the point? What is the benefit? Dunno, maybe we do not understand
each other, because I don't think you are answering my questions at all.

Best regards,
Krzysztof

RE: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Frank Li]

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Sent: Wednesday, March 22, 2023 4:43 PM
> To: Frank Li <frank.li@nxp.com>
> Cc: devicetree@vger.kernel.org; festevam@gmail.com; imx@lists.linux.dev;
> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
> shawnguo@kernel.org
> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
> imx8qm cdns3 glue bindings
> 
> Caution: EXT Email
> 
> On 22/03/2023 22:40, Frank Li wrote:
> >
> >
> >> -----Original Message-----
> >> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> >> Sent: Wednesday, March 22, 2023 4:38 PM
> >> To: Frank Li <frank.li@nxp.com>
> >> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
> imx@lists.linux.dev;
> >> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
> >> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
> >> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
> >> shawnguo@kernel.org
> >> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
> >> imx8qm cdns3 glue bindings
> >>
> >> Caution: EXT Email
> >>
> >> On 22/03/2023 22:36, Frank Li wrote:
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> >>>> Sent: Wednesday, March 22, 2023 4:32 PM
> >>>> To: Frank Li <frank.li@nxp.com>
> >>>> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
> >> imx@lists.linux.dev;
> >>>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
> >>>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
> >>>> kernel@vger.kernel.org; robh+dt@kernel.org;
> s.hauer@pengutronix.de;
> >>>> shawnguo@kernel.org
> >>>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm:
> add
> >>>> imx8qm cdns3 glue bindings
> >>>>
> >>>> Caution: EXT Email
> >>>>
> >>>> On 22/03/2023 15:34, Frank Li wrote:
> >>>>>
> >>>>>
> >>>>>> -----Original Message-----
> >>>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> >>>>>> Sent: Wednesday, March 22, 2023 2:32 AM
> >>>>>> To: Frank Li <frank.li@nxp.
> >>>>>>> +      - const: usb3_aclk
> >>>>>>> +      - const: usb3_ipg_clk
> >>>>>>> +      - const: usb3_core_pclk
> >>>>>>> +
> >>>>>>> +  assigned-clocks:
> >>>>>>> +    items:
> >>>>>>> +      - description: Phandle and clock specifoer of
> >>>>>> IMX_SC_PM_CLK_MST_BUS.
> >>>>>>
> >>>>>> Drop useless pieces so "Phandle and clock specifoer of " and name
> the
> >>>>>> hardware, not the syntax.
> >>>>>>
> >>>>>>> +
> >>>>>>> +  assigned-clock-rates:
> >>>>>>> +    items:
> >>>>>>> +      - description: Should be in Range 100 - 600 Mhz.
> >>>>>>
> >>>>>> That's better but I still do not understand why do you need it in the
> >>>>>> bindings. You never actually answered this question.
> >>>>>
> >>>>> I am not sure 100% sure the reason.
> >>>>> I think difference system target's  axi bus frequency is difference,
> >>>>> And just one time work, needn't software to manage it.
> >>>>> Following other driver's code style may be another reason.
> >>>>
> >>>> That's the reason of heaving it in DTS. But I am asking about bindings.
> >>>> You do understand you define here interface?
> >>>
> >>> I defined here is descript AXI frequency for usb controller. Supposed
> >> difference
> >>> Platform will have difference working frequency.
> >>
> >> I don't understand how does this answer my concerns of having it in DT
> >> bindings. If you do not add it, you "will have difference working
> >> frequency", so what's the point?
> >
> > For example: imx8qxp, it need set to 250Mhz,  i.MX8QM need set to
> 200Mhz.
> > Maybe future chip can set to 400Mhz.
> 
> And? So as you can see you will still have different frequencies, so
> what's the point? What is the benefit? Dunno, maybe we do not understand
> each other, because I don't think you are answering my questions at all.

Benefit: New chip just need change dts file for the same IP, like change base
Reg address and irq number.  

Your question is:  "why need this assigned-clock-rates IMX_SC_PM_CLK_MST_BUS property?"  

My answer: it is one of hardware property, like reg base address and irq number.

If can't match your expectation, can you change another words or provide me an example?  

> 
> Best regards,
> Krzysztof

Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Krzysztof Kozlowski]

On 22/03/2023 22:57, Frank Li wrote:
> 
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> Sent: Wednesday, March 22, 2023 4:43 PM
>> To: Frank Li <frank.li@nxp.com>
>> Cc: devicetree@vger.kernel.org; festevam@gmail.com; imx@lists.linux.dev;
>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
>> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
>> shawnguo@kernel.org
>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
>> imx8qm cdns3 glue bindings
>>
>> Caution: EXT Email
>>
>> On 22/03/2023 22:40, Frank Li wrote:
>>>
>>>
>>>> -----Original Message-----
>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>> Sent: Wednesday, March 22, 2023 4:38 PM
>>>> To: Frank Li <frank.li@nxp.com>
>>>> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
>> imx@lists.linux.dev;
>>>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
>>>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
>>>> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
>>>> shawnguo@kernel.org
>>>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
>>>> imx8qm cdns3 glue bindings
>>>>
>>>> Caution: EXT Email
>>>>
>>>> On 22/03/2023 22:36, Frank Li wrote:
>>>>>
>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>>>> Sent: Wednesday, March 22, 2023 4:32 PM
>>>>>> To: Frank Li <frank.li@nxp.com>
>>>>>> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
>>>> imx@lists.linux.dev;
>>>>>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
>>>>>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
>>>>>> kernel@vger.kernel.org; robh+dt@kernel.org;
>> s.hauer@pengutronix.de;
>>>>>> shawnguo@kernel.org
>>>>>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm:
>> add
>>>>>> imx8qm cdns3 glue bindings
>>>>>>
>>>>>> Caution: EXT Email
>>>>>>
>>>>>> On 22/03/2023 15:34, Frank Li wrote:
>>>>>>>
>>>>>>>
>>>>>>>> -----Original Message-----
>>>>>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>>>>>> Sent: Wednesday, March 22, 2023 2:32 AM
>>>>>>>> To: Frank Li <frank.li@nxp.
>>>>>>>>> +      - const: usb3_aclk
>>>>>>>>> +      - const: usb3_ipg_clk
>>>>>>>>> +      - const: usb3_core_pclk
>>>>>>>>> +
>>>>>>>>> +  assigned-clocks:
>>>>>>>>> +    items:
>>>>>>>>> +      - description: Phandle and clock specifoer of
>>>>>>>> IMX_SC_PM_CLK_MST_BUS.
>>>>>>>>
>>>>>>>> Drop useless pieces so "Phandle and clock specifoer of " and name
>> the
>>>>>>>> hardware, not the syntax.
>>>>>>>>
>>>>>>>>> +
>>>>>>>>> +  assigned-clock-rates:
>>>>>>>>> +    items:
>>>>>>>>> +      - description: Should be in Range 100 - 600 Mhz.
>>>>>>>>
>>>>>>>> That's better but I still do not understand why do you need it in the
>>>>>>>> bindings. You never actually answered this question.
>>>>>>>
>>>>>>> I am not sure 100% sure the reason.
>>>>>>> I think difference system target's  axi bus frequency is difference,
>>>>>>> And just one time work, needn't software to manage it.
>>>>>>> Following other driver's code style may be another reason.
>>>>>>
>>>>>> That's the reason of heaving it in DTS. But I am asking about bindings.
>>>>>> You do understand you define here interface?
>>>>>
>>>>> I defined here is descript AXI frequency for usb controller. Supposed
>>>> difference
>>>>> Platform will have difference working frequency.
>>>>
>>>> I don't understand how does this answer my concerns of having it in DT
>>>> bindings. If you do not add it, you "will have difference working
>>>> frequency", so what's the point?
>>>
>>> For example: imx8qxp, it need set to 250Mhz,  i.MX8QM need set to
>> 200Mhz.
>>> Maybe future chip can set to 400Mhz.
>>
>> And? So as you can see you will still have different frequencies, so
>> what's the point? What is the benefit? Dunno, maybe we do not understand
>> each other, because I don't think you are answering my questions at all.
> 
> Benefit: New chip just need change dts file for the same IP, like change base
> Reg address and irq number.  

To remind - the question was:
"That's better but I still do not understand why do you need it in the
bindings."
If you drop it from the bindings the benefit is still there, so what do
you want to prove?

> 
> Your question is:  "why need this assigned-clock-rates IMX_SC_PM_CLK_MST_BUS property?"

This was the previous thread. Now, related but slightly different, why
do you still need it in the bindings?


> My answer: it is one of hardware property, like reg base address and irq number.

Sure, it is, I know, and bindings already allow it. Just look at many
DTS and their bindings. Do you see the bindings defining this property?
No. So why do you think it is needed here? I am asking this since like 6
emails and your answers are not related to bindings at all.

> 
> If can't match your expectation, can you change another words or provide me an example?  

Yeah, just open several DTS and look for assigned-clock, then open their
bindings and answer - why do you need to add it to the binding but all
other bindings did not have to? If you have the answer, sure, bring
these parts of bindings.

Best regards,
Krzysztof

RE: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Frank Li]

> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> Sent: Wednesday, March 22, 2023 5:09 PM
> To: Frank Li <frank.li@nxp.com>
> Cc: devicetree@vger.kernel.org; festevam@gmail.com; imx@lists.linux.dev;
> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
> shawnguo@kernel.org
> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
> imx8qm cdns3 glue bindings
> 
> Caution: EXT Email
> 
> On 22/03/2023 22:57, Frank Li wrote:
> >
> >
> >> -----Original Message-----
> >> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> >> Sent: Wednesday, March 22, 2023 4:43 PM
> >> To: Frank Li <frank.li@nxp.com>
> >> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
> imx@lists.linux.dev;
> >> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
> >> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
> >> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
> >> shawnguo@kernel.org
> >> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
> >> imx8qm cdns3 glue bindings
> >>
> >> Caution: EXT Email
> >>
> >> On 22/03/2023 22:40, Frank Li wrote:
> >>>
> >>>
> >>>> -----Original Message-----
> >>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> >>>> Sent: Wednesday, March 22, 2023 4:38 PM
> >>>> To: Frank Li <frank.li@nxp.com>
> >>>> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
> >> imx@lists.linux.dev;
> >>>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
> >>>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
> >>>> kernel@vger.kernel.org; robh+dt@kernel.org;
> s.hauer@pengutronix.de;
> >>>> shawnguo@kernel.org
> >>>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm:
> add
> >>>> imx8qm cdns3 glue bindings
> >>>>
> >>>> Caution: EXT Email
> >>>>
> >>>> On 22/03/2023 22:36, Frank Li wrote:
> >>>>>
> >>>>>
> >>>>>> -----Original Message-----
> >>>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> >>>>>> Sent: Wednesday, March 22, 2023 4:32 PM
> >>>>>> To: Frank Li <frank.li@nxp.com>
> >>>>>> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
> >>>> imx@lists.linux.dev;
> >>>>>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-
> arm-
> >>>>>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>;
> linux-
> >>>>>> kernel@vger.kernel.org; robh+dt@kernel.org;
> >> s.hauer@pengutronix.de;
> >>>>>> shawnguo@kernel.org
> >>>>>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm:
> >> add
> >>>>>> imx8qm cdns3 glue bindings
> >>>>>>
> >>>>>> Caution: EXT Email
> >>>>>>
> >>>>>> On 22/03/2023 15:34, Frank Li wrote:
> >>>>>>>
> >>>>>>>
> >>>>>>>> -----Original Message-----
> >>>>>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
> >>>>>>>> Sent: Wednesday, March 22, 2023 2:32 AM
> >>>>>>>> To: Frank Li <frank.li@nxp.
> >>>>>>>>> +      - const: usb3_aclk
> >>>>>>>>> +      - const: usb3_ipg_clk
> >>>>>>>>> +      - const: usb3_core_pclk
> >>>>>>>>> +
> >>>>>>>>> +  assigned-clocks:
> >>>>>>>>> +    items:
> >>>>>>>>> +      - description: Phandle and clock specifoer of
> >>>>>>>> IMX_SC_PM_CLK_MST_BUS.
> >>>>>>>>
> >>>>>>>> Drop useless pieces so "Phandle and clock specifoer of " and
> name
> >> the
> >>>>>>>> hardware, not the syntax.
> >>>>>>>>
> >>>>>>>>> +
> >>>>>>>>> +  assigned-clock-rates:
> >>>>>>>>> +    items:
> >>>>>>>>> +      - description: Should be in Range 100 - 600 Mhz.
> >>>>>>>>
> >>>>>>>> That's better but I still do not understand why do you need it in
> the
> >>>>>>>> bindings. You never actually answered this question.
> >>>>>>>
> >>>>>>> I am not sure 100% sure the reason.
> >>>>>>> I think difference system target's  axi bus frequency is difference,
> >>>>>>> And just one time work, needn't software to manage it.
> >>>>>>> Following other driver's code style may be another reason.
> >>>>>>
> >>>>>> That's the reason of heaving it in DTS. But I am asking about bindings.
> >>>>>> You do understand you define here interface?
> >>>>>
> >>>>> I defined here is descript AXI frequency for usb controller. Supposed
> >>>> difference
> >>>>> Platform will have difference working frequency.
> >>>>
> >>>> I don't understand how does this answer my concerns of having it in DT
> >>>> bindings. If you do not add it, you "will have difference working
> >>>> frequency", so what's the point?
> >>>
> >>> For example: imx8qxp, it need set to 250Mhz,  i.MX8QM need set to
> >> 200Mhz.
> >>> Maybe future chip can set to 400Mhz.
> >>
> >> And? So as you can see you will still have different frequencies, so
> >> what's the point? What is the benefit? Dunno, maybe we do not
> understand
> >> each other, because I don't think you are answering my questions at all.
> >
> > Benefit: New chip just need change dts file for the same IP, like change
> base
> > Reg address and irq number.
> 
> To remind - the question was:
> "That's better but I still do not understand why do you need it in the
> bindings."
> If you drop it from the bindings the benefit is still there, so what do
> you want to prove?
> 
> >
> > Your question is:  "why need this assigned-clock-rates
> IMX_SC_PM_CLK_MST_BUS property?"
> 
> This was the previous thread. Now, related but slightly different, why
> do you still need it in the bindings?
> 
> 
> > My answer: it is one of hardware property, like reg base address and irq
> number.
> 
> Sure, it is, I know, and bindings already allow it. Just look at many
> DTS and their bindings. Do you see the bindings defining this property?
> No. So why do you think it is needed here? I am asking this since like 6
> emails and your answers are not related to bindings at all.
> 
> >
> > If can't match your expectation, can you change another words or provide
> me an example?
> 
> Yeah, just open several DTS and look for assigned-clock, then open their
> bindings and answer - why do you need to add it to the binding but all
> other bindings did not have to? If you have the answer, sure, bring
> these parts of bindings.

Do you means, Needn't add assigned-clock in binding *document* yaml file?
And dts file still can use assigned-clock property. 

> 
> Best regards,
> Krzysztof

Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add imx8qm cdns3 glue bindings

[Krzysztof Kozlowski]

On 22/03/2023 23:15, Frank Li wrote:
> 
> 
>> -----Original Message-----
>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>> Sent: Wednesday, March 22, 2023 5:09 PM
>> To: Frank Li <frank.li@nxp.com>
>> Cc: devicetree@vger.kernel.org; festevam@gmail.com; imx@lists.linux.dev;
>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
>> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
>> shawnguo@kernel.org
>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
>> imx8qm cdns3 glue bindings
>>
>> Caution: EXT Email
>>
>> On 22/03/2023 22:57, Frank Li wrote:
>>>
>>>
>>>> -----Original Message-----
>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>> Sent: Wednesday, March 22, 2023 4:43 PM
>>>> To: Frank Li <frank.li@nxp.com>
>>>> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
>> imx@lists.linux.dev;
>>>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
>>>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
>>>> kernel@vger.kernel.org; robh+dt@kernel.org; s.hauer@pengutronix.de;
>>>> shawnguo@kernel.org
>>>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm: add
>>>> imx8qm cdns3 glue bindings
>>>>
>>>> Caution: EXT Email
>>>>
>>>> On 22/03/2023 22:40, Frank Li wrote:
>>>>>
>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>>>> Sent: Wednesday, March 22, 2023 4:38 PM
>>>>>> To: Frank Li <frank.li@nxp.com>
>>>>>> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
>>>> imx@lists.linux.dev;
>>>>>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-arm-
>>>>>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>; linux-
>>>>>> kernel@vger.kernel.org; robh+dt@kernel.org;
>> s.hauer@pengutronix.de;
>>>>>> shawnguo@kernel.org
>>>>>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm:
>> add
>>>>>> imx8qm cdns3 glue bindings
>>>>>>
>>>>>> Caution: EXT Email
>>>>>>
>>>>>> On 22/03/2023 22:36, Frank Li wrote:
>>>>>>>
>>>>>>>
>>>>>>>> -----Original Message-----
>>>>>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>>>>>> Sent: Wednesday, March 22, 2023 4:32 PM
>>>>>>>> To: Frank Li <frank.li@nxp.com>
>>>>>>>> Cc: devicetree@vger.kernel.org; festevam@gmail.com;
>>>>>> imx@lists.linux.dev;
>>>>>>>> kernel@pengutronix.de; krzysztof.kozlowski+dt@linaro.org; linux-
>> arm-
>>>>>>>> kernel@lists.infradead.org; dl-linux-imx <linux-imx@nxp.com>;
>> linux-
>>>>>>>> kernel@vger.kernel.org; robh+dt@kernel.org;
>>>> s.hauer@pengutronix.de;
>>>>>>>> shawnguo@kernel.org
>>>>>>>> Subject: Re: [EXT] Re: [PATCH v3 1/3] dt-bindings: usb: cdns-imx8qm:
>>>> add
>>>>>>>> imx8qm cdns3 glue bindings
>>>>>>>>
>>>>>>>> Caution: EXT Email
>>>>>>>>
>>>>>>>> On 22/03/2023 15:34, Frank Li wrote:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> -----Original Message-----
>>>>>>>>>> From: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
>>>>>>>>>> Sent: Wednesday, March 22, 2023 2:32 AM
>>>>>>>>>> To: Frank Li <frank.li@nxp.
>>>>>>>>>>> +      - const: usb3_aclk
>>>>>>>>>>> +      - const: usb3_ipg_clk
>>>>>>>>>>> +      - const: usb3_core_pclk
>>>>>>>>>>> +
>>>>>>>>>>> +  assigned-clocks:
>>>>>>>>>>> +    items:
>>>>>>>>>>> +      - description: Phandle and clock specifoer of
>>>>>>>>>> IMX_SC_PM_CLK_MST_BUS.
>>>>>>>>>>
>>>>>>>>>> Drop useless pieces so "Phandle and clock specifoer of " and
>> name
>>>> the
>>>>>>>>>> hardware, not the syntax.
>>>>>>>>>>
>>>>>>>>>>> +
>>>>>>>>>>> +  assigned-clock-rates:
>>>>>>>>>>> +    items:
>>>>>>>>>>> +      - description: Should be in Range 100 - 600 Mhz.
>>>>>>>>>>
>>>>>>>>>> That's better but I still do not understand why do you need it in
>> the
>>>>>>>>>> bindings. You never actually answered this question.
>>>>>>>>>
>>>>>>>>> I am not sure 100% sure the reason.
>>>>>>>>> I think difference system target's  axi bus frequency is difference,
>>>>>>>>> And just one time work, needn't software to manage it.
>>>>>>>>> Following other driver's code style may be another reason.
>>>>>>>>
>>>>>>>> That's the reason of heaving it in DTS. But I am asking about bindings.
>>>>>>>> You do understand you define here interface?
>>>>>>>
>>>>>>> I defined here is descript AXI frequency for usb controller. Supposed
>>>>>> difference
>>>>>>> Platform will have difference working frequency.
>>>>>>
>>>>>> I don't understand how does this answer my concerns of having it in DT
>>>>>> bindings. If you do not add it, you "will have difference working
>>>>>> frequency", so what's the point?
>>>>>
>>>>> For example: imx8qxp, it need set to 250Mhz,  i.MX8QM need set to
>>>> 200Mhz.
>>>>> Maybe future chip can set to 400Mhz.
>>>>
>>>> And? So as you can see you will still have different frequencies, so
>>>> what's the point? What is the benefit? Dunno, maybe we do not
>> understand
>>>> each other, because I don't think you are answering my questions at all.
>>>
>>> Benefit: New chip just need change dts file for the same IP, like change
>> base
>>> Reg address and irq number.
>>
>> To remind - the question was:
>> "That's better but I still do not understand why do you need it in the
>> bindings."
>> If you drop it from the bindings the benefit is still there, so what do
>> you want to prove?
>>
>>>
>>> Your question is:  "why need this assigned-clock-rates
>> IMX_SC_PM_CLK_MST_BUS property?"
>>
>> This was the previous thread. Now, related but slightly different, why
>> do you still need it in the bindings?
>>
>>
>>> My answer: it is one of hardware property, like reg base address and irq
>> number.
>>
>> Sure, it is, I know, and bindings already allow it. Just look at many
>> DTS and their bindings. Do you see the bindings defining this property?
>> No. So why do you think it is needed here? I am asking this since like 6
>> emails and your answers are not related to bindings at all.
>>
>>>
>>> If can't match your expectation, can you change another words or provide
>> me an example?
>>
>> Yeah, just open several DTS and look for assigned-clock, then open their
>> bindings and answer - why do you need to add it to the binding but all
>> other bindings did not have to? If you have the answer, sure, bring
>> these parts of bindings.
> 
> Do you means, Needn't add assigned-clock in binding *document* yaml file?
> And dts file still can use assigned-clock property. 

Yes, I said it many times already...

Best regards,
Krzysztof