[EXT] Re: [PATCH v2 1/2] dt-bindings: phy: mxs-usb-phy: convert to DT schema format
Xu Yang
xu.yang_2 at nxp.com
Fri Jun 9 02:23:42 PDT 2023
Hi Stefan,
> -----Original Message-----
> From: Stefan Wahren <stefan.wahren at i2se.com>
> Sent: Thursday, June 8, 2023 7:39 PM
> To: Xu Yang <xu.yang_2 at nxp.com>; robh+dt at kernel.org; krzysztof.kozlowski+dt at linaro.org; conor+dt at kernel.org
> Cc: shawnguo at kernel.org; s.hauer at pengutronix.de; kernel at pengutronix.de; festevam at gmail.com; dl-linux-imx <linux-
> imx at nxp.com>; linux-phy at lists.infradead.org; devicetree at vger.kernel.org; linux-arm-kernel at lists.infradead.org; linux-
> usb at vger.kernel.org; Jun Li <jun.li at nxp.com>
> Subject: Re: [EXT] Re: [PATCH v2 1/2] dt-bindings: phy: mxs-usb-phy: convert to DT schema format
>
> Caution: This is an external email. Please take care when clicking links or opening attachments. When in doubt, report the
> message using the 'Report this email' button
>
>
> Hi Xu,
>
> Am 08.06.23 um 12:30 schrieb Xu Yang:
> > Hi Stefan,
> >
> >> -----Original Message-----
> >> From: Stefan Wahren <stefan.wahren at i2se.com>
> >> Sent: Thursday, June 8, 2023 3:56 PM
> >> To: Xu Yang <xu.yang_2 at nxp.com>; robh+dt at kernel.org; krzysztof.kozlowski+dt at linaro.org; conor+dt at kernel.org
> >> Cc: shawnguo at kernel.org; s.hauer at pengutronix.de; kernel at pengutronix.de; festevam at gmail.com; dl-linux-imx
> <linux-
> >> imx at nxp.com>; linux-phy at lists.infradead.org; devicetree at vger.kernel.org; linux-arm-kernel at lists.infradead.org;
> linux-
> >> usb at vger.kernel.org; Jun Li <jun.li at nxp.com>
> >> Subject: [EXT] Re: [PATCH v2 1/2] dt-bindings: phy: mxs-usb-phy: convert to DT schema format
> >>
> >> Caution: This is an external email. Please take care when clicking links or opening attachments. When in doubt, report
> the
> >> message using the 'Report this email' button
> >>
> >>
> >> Hi Xu,
> >>
> >> Am 08.06.23 um 05:36 schrieb Xu Yang:
> >>> Convert the binding to DT schema format. Besides, this also add other
> >>> optional properties not contained in txt file.
> >>>
> >>> Signed-off-by: Xu Yang <xu.yang_2 at nxp.com>
> >>>
> >>> ---
> >>> Changes in v2:
> >>> - change filename to fsl,mxs-usbphy.yaml
> >>> - add other optional properties
> >>> - narrow fsl,anatop to imx6
> >>> - use additionalProperties
> >>> ---
> >>> .../bindings/phy/fsl,mxs-usbphy.yaml | 128 ++++++++++++++++++
> >>> .../devicetree/bindings/phy/mxs-usb-phy.txt | 33 -----
> >>> 2 files changed, 128 insertions(+), 33 deletions(-)
> >>> create mode 100644 Documentation/devicetree/bindings/phy/fsl,mxs-usbphy.yaml
> >>> delete mode 100644 Documentation/devicetree/bindings/phy/mxs-usb-phy.txt
> >>>
> >>> diff --git a/Documentation/devicetree/bindings/phy/fsl,mxs-usbphy.yaml
> >> b/Documentation/devicetree/bindings/phy/fsl,mxs-usbphy.yaml
> >>> new file mode 100644
> >>> index 000000000000..1b6b19fdf491
> >>> --- /dev/null
> >>> +++ b/Documentation/devicetree/bindings/phy/fsl,mxs-usbphy.yaml
> >>> @@ -0,0 +1,128 @@
> >>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> >>> +%YAML 1.2
> >>> +---
> >>> +$id:
> >>
> http://devicetree.org/schemas/phy/fsl,mxs-
> &data=05%7C01%7Cxu.yang_2%40nxp.com%7C35ccff605dbd46ac9d8608db6814f13f%7C686ea1d3bc2b4c6fa92cd99c5c3016
> 35%7C0%7C0%7C638218211379372106%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I
> k1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=gSKnnBeB7BrscJNdHEPWgALwvaSlnZrCbW2lo1K8D0s%3D&reserv
> ed=0
> >>
> usbphy.yaml%23&data=05%7C01%7Cxu.yang_2%40nxp.com%7C5df4d949f975469013b408db67f5d46c%7C686ea1d3bc2b4c
> >>
> 6fa92cd99c5c301635%7C0%7C0%7C638218077754788407%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjo
> >>
> iV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=8Sz8tK9GVQqE6ywVLpxPB8YDFQvygZvj6s1NjZk
> >> hbzU%3D&reserved=0
> >>> +$schema: http://devicetree.org/meta-
> &data=05%7C01%7Cxu.yang_2%40nxp.com%7C35ccff605dbd46ac9d8608db6814f13f%7C686ea1d3bc2b4c6fa92cd99c5c3016
> 35%7C0%7C0%7C638218211379372106%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6I
> k1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=D3MKKJpLHdfLhK9ubiqQYGZ7ORNDOYbA%2FJOQX%2B3DoAg%3
> D&reserved=0
> >>
> schemas%2Fcore.yaml%23&data=05%7C01%7Cxu.yang_2%40nxp.com%7C5df4d949f975469013b408db67f5d46c%7C686ea1
> >>
> d3bc2b4c6fa92cd99c5c301635%7C0%7C0%7C638218077754788407%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMD
> >>
> AiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=iaX16VnSJnvU%2F0tcnRgsdnTxMsD89
> >> 5r4WquGsCFt9Qo%3D&reserved=0
> >>> +
> >>> +title: Freescale MXS USB Phy Device
> >>> +
> >>> +maintainers:
> >>> + - Xu Yang <xu.yang_2 at nxp.com>
> >>> +
> >>> +properties:
> >>> + compatible:
> >>> + oneOf:
> >>> + - enum:
> >>> + - fsl,imx23-usbphy
> >>> + - fsl,vf610-usbphy
> >>> + - fsl,imx7ulp-usbphy
> >>
> >> on the one side the fsl,imx7ulp-usbphy has an individual compatible
> >>
> >>> + - items:
> >>> + - enum:
> >>> + - fsl,imx28-usbphy
> >>> + - fsl,imx6ul-usbphy
> >>> + - fsl,imx6sl-usbphy
> >>> + - fsl,imx6sx-usbphy
> >>> + - fsl,imx6q-usbphy
> >>> + - const: fsl,imx23-usbphy
> >>> + - items:
> >>> + - const: fsl,imx6sll-usbphy
> >>> + - const: fsl,imx6ul-usbphy
> >>> + - const: fsl,imx23-usbphy
> >>> + - items:
> >>> + - const: fsl,imx7ulp-usbphy
> >>> + - const: fsl,imx6ul-usbphy
> >>
> >> on the other side this should be compatible to imx6ul. So at least one
> >> definition seems to be unnecessary.
> >>
> >> Looking at usb/phy/phy-mxs-usb.c suggests me that fsl,imx7ulp-usbphy is
> >> not directly compatible to fsl,imx6ul-usbphy, because the platform data
> >> is different. So maybe the using dts* files should be fixed instead?
> >
> > The imx7ulp and imx6ul only has minor difference. In general, imx7ulp
> > is compatilbe with imx6ul. We don't need to modify both dts file and
> > this doc here. So the validation of existing dtb would not fail.
>
> The fact that according to the schema imx6ul needs fsl,anatop and
> imx7ulp doesn't need it, let me think that the difference is not really
> minor.
>
> Nevertheless the compatibles for imx7ulp-usbphy looks fishy to me,
> because there are two ways to describe imx7ulp-usbphy ( with and without
> fsl,imx6ul-usbphy ). From my understanding there should be only one way.
>
> In case you are just concerned about validation issues in this series:
> it's acceptable to convert txt file to YAML and fix outstanding
> validation issues within the series via separate patch. In my opinion
> the goal is to get a proper DT schema and not just to avoid DT
> validation warnings.
I reviewed the dts files and driver again. It seems indeedly that
imx7ulp-usbphy is diverged from imx6ul-usbphy today. Therefore, to keep
this doc clear, "fsl,imx7ulp-usbphy", "fsl,imx6ul-usbphy" could be
removed. Thanks for your input. I will remove the second one and keep
the first one in V4.
Thanks,
Xu Yang
>
> Best regards
>
> >
> > Thanks,
> > Xu Yang
> >
> >>
> >>> + - items:
> >>> + - const: fsl,imx8dxl-usbphy
> >>> + - const: fsl,imx7ulp-usbphy
> >>> +
> >>> + reg:
> >>> + minItems: 1
> >>> + maxItems: 2
> >>> +
> >>> + interrupts:
> >>> + minItems: 1
> >>> + maxItems: 2
> >>> +
> >>> + clocks:
> >>> + maxItems: 1
> >>> +
> >>> + '#phy-cells':
> >>> + const: 0
> >>> +
> >>> + power-domains:
> >>> + maxItems: 1
> >>> +
> >>> + fsl,anatop:
> >>> + description:
> >>> + phandle for anatop register, it is only for imx6 SoC series.
> >>> + $ref: /schemas/types.yaml#/definitions/phandle
> >>> +
> >>> + phy-3p0-supply:
> >>> + description:
> >>> + One of USB PHY's power supply. Can be used to keep a good signal
> >>> + quality.
> >>> +
> >>> + fsl,tx-cal-45-dn-ohms:
> >>> + description:
> >>> + Resistance (in ohms) of switchable high-speed trimming resistor
> >>> + connected in parallel with the 45 ohm resistor that terminates
> >>> + the DN output signal.
> >>> + minimum: 35
> >>> + maximum: 54
> >>> + default: 45
> >>> +
> >>> + fsl,tx-cal-45-dp-ohms:
> >>> + description:
> >>> + Resistance (in ohms) of switchable high-speed trimming resistor
> >>> + connected in parallel with the 45 ohm resistor that terminates
> >>> + the DP output signal.
> >>> + minimum: 35
> >>> + maximum: 54
> >>> + default: 45
> >>> +
> >>> + fsl,tx-d-cal:
> >>> + description:
> >>> + Current trimming value (as a percentage) of the 17.78 mA TX
> >>> + reference current.
> >>> + $ref: /schemas/types.yaml#/definitions/uint32
> >>> + minimum: 79
> >>> + maximum: 119
> >>> + default: 100
> >>> +
> >>> +required:
> >>> + - compatible
> >>> + - reg
> >>> + - clocks
> >>> +
> >>> +allOf:
> >>> + - if:
> >>> + properties:
> >>> + compatible:
> >>> + oneOf:
> >>> + - enum:
> >>> + - fsl,imx6sl-usbphy
> >>> + - fsl,imx6sx-usbphy
> >>> + - fsl,imx6sll-usbphy
> >>> + - fsl,imx6q-usbphy
> >>> + - fsl,vf610-usbphy
> >>> + - items:
> >>> + - const: fsl,imx6ul-usbphy
> >>> + - const: fsl,imx23-usbphy
> >>> + then:
> >>> + required:
> >>> + - fsl,anatop
> >>> +
> >>> +additionalProperties: false
> >>> +
> >>> +examples:
> >>> + - |
> >>> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> >>> +
> >>> + usbphy1: usb-phy at 20c9000 {
> >>> + compatible = "fsl,imx6q-usbphy", "fsl,imx23-usbphy";
> >>> + reg = <0x020c9000 0x1000>;
> >>> + interrupts = <GIC_SPI 44 IRQ_TYPE_LEVEL_HIGH>;
> >>> + fsl,anatop = <&anatop>;
> >>> + };
> >>> +
> >>> +...
> >>> diff --git a/Documentation/devicetree/bindings/phy/mxs-usb-phy.txt
> b/Documentation/devicetree/bindings/phy/mxs-
> >> usb-phy.txt
> >>> deleted file mode 100644
> >>> index 70c813b0755f..000000000000
> >>> --- a/Documentation/devicetree/bindings/phy/mxs-usb-phy.txt
> >>> +++ /dev/null
> >>> @@ -1,33 +0,0 @@
> >>> -* Freescale MXS USB Phy Device
> >>> -
> >>> -Required properties:
> >>> -- compatible: should contain:
> >>> - * "fsl,imx23-usbphy" for imx23 and imx28
> >>> - * "fsl,imx6q-usbphy" for imx6dq and imx6dl
> >>> - * "fsl,imx6sl-usbphy" for imx6sl
> >>> - * "fsl,vf610-usbphy" for Vybrid vf610
> >>> - * "fsl,imx6sx-usbphy" for imx6sx
> >>> - * "fsl,imx7ulp-usbphy" for imx7ulp
> >>> - * "fsl,imx8dxl-usbphy" for imx8dxl
> >>> - "fsl,imx23-usbphy" is still a fallback for other strings
> >>> -- reg: Should contain registers location and length
> >>> -- interrupts: Should contain phy interrupt
> >>> -- fsl,anatop: phandle for anatop register, it is only for imx6 SoC series
> >>> -
> >>> -Optional properties:
> >>> -- fsl,tx-cal-45-dn-ohms: Integer [35-54]. Resistance (in ohms) of switchable
> >>> - high-speed trimming resistor connected in parallel with the 45 ohm resistor
> >>> - that terminates the DN output signal. Default: 45
> >>> -- fsl,tx-cal-45-dp-ohms: Integer [35-54]. Resistance (in ohms) of switchable
> >>> - high-speed trimming resistor connected in parallel with the 45 ohm resistor
> >>> - that terminates the DP output signal. Default: 45
> >>> -- fsl,tx-d-cal: Integer [79-119]. Current trimming value (as a percentage) of
> >>> - the 17.78mA TX reference current. Default: 100
> >>> -
> >>> -Example:
> >>> -usbphy1: usb-phy at 20c9000 {
> >>> - compatible = "fsl,imx6q-usbphy", "fsl,imx23-usbphy";
> >>> - reg = <0x020c9000 0x1000>;
> >>> - interrupts = <0 44 0x04>;
> >>> - fsl,anatop = <&anatop>;
> >>> -};
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