Re: [PATCH v2 2/3] dt-bindings: phy: qcom-qusb2: Convert QUSB2 phy bindings to yaml

[Doug Anderson]

Hi,

On Wed, Dec 4, 2019 at 8:43 PM Sandeep Maheswaram <sanm@xxxxxxxxxxxxxx> wrote:
>
> diff --git a/Documentation/devicetree/bindings/phy/qcom-qusb2-phy.yaml b/Documentation/devicetree/bindings/phy/qcom-qusb2-phy.yaml

Hrm.  Probably should have given this same comment on the USB3 yaml
bindings too, but I think the file name should be:

qcom,qusb2-phy.yaml

Specifically I think that's what Rob H has been requesting elsewhere.



> new file mode 100644
> index 0000000..3ef94bc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/phy/qcom-qusb2-phy.yaml
> @@ -0,0 +1,129 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/phy/qcom-qusb2-phy.yaml#";

If you change the name to add the comma (as per above), don't forget
to update your ID.


> +$schema: "http://devicetree.org/meta-schemas/core.yaml#";
> +
> +title: Qualcomm QUSB2 phy controller
> +
> +maintainers:
> +  - Manu Gautam <mgautam@xxxxxxxxxxxxxx>
> +
> +description: |

nit: don't need the "|" unless carriage returns are important.


> +  QUSB2 controller supports LS/FS/HS usb connectivity on Qualcomm chipsets.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,msm8996-qusb2-phy
> +      - qcom,msm8998-qusb2-phy
> +      - qcom,sdm845-qusb2-phy
> +
> +  reg:
> +    description:
> +        offset and length of the PHY register set.

No description, just maxItems: 1 I think.  This seemed to be what Rob
H suggested in USB3 bindings with regards to resets where the
description was just generic [1].


> +  "#phy-cells":
> +    const: 0
> +
> +  clocks:
> +    maxItems: 3
> +    description:
> +        a list of phandles and clock-specifier pairs,
> +        one for each entry in clock-names.
> +
> +  clock-names:
> +    items:
> +      - const: cfg_ahb #phy config clock
> +      - const: ref #19.2 MHz ref clk
> +      - const: iface #phy interface clock (Optional)

Please take the same type of feedback you got for the USB3 bindings
with regards to clocks / clock-names.


> +  vdda-pll-supply:
> +     description:
> +       Phandle to 1.8V regulator supply to PHY refclk pll block.
> +
> +  vdda-phy-dpdm-supply:
> +     description:
> +       Phandle to 3.1V regulator supply to Dp/Dm port signals.
> +
> +  resets:
> +    description:
> +       Phandle to reset to phy block.

No description, just maxItems: 1 I think [1].


> +  nvmem-cells:
> +    description:
> +        Phandle to nvmem cell that contains 'HS Tx trim'
> +        tuning parameter value for qusb2 phy.

Add maxItems: 1 ?


> +  qcom,tcsr-syscon:
> +    description:
> +        Phandle to TCSR syscon register region.
> +    $ref: /schemas/types.yaml#/definitions/cell
> +
> +  qcom,imp-res-offset-value:
> +    description:
> +        It is a 6 bit value that specifies offset to be
> +        added to PHY refgen RESCODE via IMP_CTRL1 register. It is a PHY
> +        tuning parameter that may vary for different boards of same SOC.
> +        This property is applicable to only QUSB2 v2 PHY (sdm845).
> +    $ref: /schemas/types.yaml#/definitions/uint32

minimum: 0
maximum: 63

...and, I think:
default: 0


> +  qcom,hstx-trim-value:
> +    description:
> +        It is a 4 bit value that specifies tuning for HSTX
> +        output current.
> +        Possible range is - 15mA to 24mA (stepsize of 600 uA).
> +        See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
> +        This property is applicable to only QUSB2 v2 PHY (sdm845).
> +        Default value is 22.2mA for sdm845.
> +    $ref: /schemas/types.yaml#/definitions/uint32

minimum: 0
maximum: 15
default: 3


> +  qcom,preemphasis-level:
> +    description:
> +        It is a 2 bit value that specifies pre-emphasis level.
> +        Possible range is 0 to 15% (stepsize of 5%).
> +        See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
> +        This property is applicable to only QUSB2 v2 PHY (sdm845).
> +        Default value is 10% for sdm845.
> +    $ref: /schemas/types.yaml#/definitions/uint32

minimum: 0
maximum: 3
default: 2


> +  qcom,preemphasis-width:
> +    description:
> +        It is a 1 bit value that specifies how long the HSTX
> +        pre-emphasis (specified using qcom,preemphasis-level) must be in
> +        effect. Duration could be half-bit of full-bit.
> +        See dt-bindings/phy/phy-qcom-qusb2.h for applicable values.
> +        This property is applicable to only QUSB2 v2 PHY (sdm845).
> +        Default value is full-bit width for sdm845.
> +    $ref: /schemas/types.yaml#/definitions/uint32

minimum: 0
maximum: 1
default: 0


> +required:
> +  - compatible
> +  - reg
> +  - "#phy-cells"
> +  - clocks
> +  - clock-names
> +  - vdda-pll-supply
> +  - vdda-phy-dpdm-supply
> +  - resets
> +
> +
> +examples:
> +  - |

#include <dt-bindings/clock/qcom,gcc-msm8996.h>


> +    hsusb_phy: phy@7411000 {
> +        compatible = "qcom,msm8996-qusb2-phy";
> +        reg = <0x7411000 0x180>;
> +        #phy-cells = <0>;
> +
> +        clocks = <&gcc GCC_USB_PHY_CFG_AHB2PHY_CLK>,
> +                <&gcc GCC_RX1_USB2_CLKREF_CLK>,

The comma at the end is a syntax error.

make dt_binding_check
DT_SCHEMA_FILES=Documentation/devicetree/bindings/phy/qcom-qusb2-phy.yaml

[1] https://lore.kernel.org/r/20191213212313.GA21092@bogus


-Doug