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Date: Tue, 24 Mar 2020 10:21:57 +0530
From: "Sandeep Maheswaram (Temp)" <sanm@...eaurora.org>
To: Stephen Boyd <swboyd@...omium.org>, Andy Gross <agross@...nel.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Doug Anderson <dianders@...omium.org>,
Felipe Balbi <balbi@...nel.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Mark Rutland <mark.rutland@....com>,
Matthias Kaehlcke <mka@...omium.org>,
Rob Herring <robh+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-usb@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
Manu Gautam <mgautam@...eaurora.org>
Subject: Re: [PATCH v4 1/2] dt-bindings: usb: qcom,dwc3: Convert USB DWC3
bindings
Hi Stephen,
Can you check my reply to the review comments and let me know how to
proceeed.
Thanks
Sandeep
On 3/13/2020 5:41 PM, Sandeep Maheswaram (Temp) wrote:
> Hi Stephen,
>
> On 2/11/2020 3:01 AM, Stephen Boyd wrote:
>> Quoting Sandeep Maheswaram (2020-02-09 22:36:44)
>>> diff --git a/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
>>> b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
>>> new file mode 100644
>>> index 0000000..0353401
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/usb/qcom,dwc3.yaml
>>> @@ -0,0 +1,155 @@
>>> +# SPDX-License-Identifier: GPL-2.0-only
>>> +%YAML 1.2
>>> +---
>>> +$id: http://devicetree.org/schemas/usb/qcom,dwc3.yaml#
>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>> +
>>> +title: Qualcomm SuperSpeed DWC3 USB SoC controller
>>> +
>>> +maintainers:
>>> + - Manu Gautam <mgautam@...eaurora.org>
>>> +
>>> +properties:
>>> + compatible:
>>> + items:
>>> + - enum:
>>> + - qcom,msm8996-dwc3
>>> + - qcom,msm8998-dwc3
>>> + - qcom,sdm845-dwc3
>>> + - const: qcom,dwc3
>>> +
>>> + reg:
>>> + description: Offset and length of register set for QSCRATCH
>>> wrapper
>>> + maxItems: 1
>>> +
>>> + "#address-cells":
>>> + enum: [ 1, 2 ]
>>> +
>>> + "#size-cells":
>>> + enum: [ 1, 2 ]
>>> +
>>> + power-domains:
>>> + description: specifies a phandle to PM domain provider node
>>> + maxItems: 1
>>> +
>>> + clocks:
>>> + description:
>>> + A list of phandle and clock-specifier pairs for the clocks
>>> + listed in clock-names.
>>> + items:
>>> + - description: System Config NOC clock.
>>> + - description: Master/Core clock, has to be >= 125 MHz
>>> + for SS operation and >= 60MHz for HS operation.
>>> + - description: System bus AXI clock.
>>> + - description: Mock utmi clock needed for ITP/SOF generation
>>> + in host mode.Its frequency should be 19.2MHz.
>> Please add a space between the end of sentence and next one.
> will do in next version
>>
>>> + - description: Sleep clock, used for wakeup when
>>> + USB3 core goes into low power mode (U3).
>>> +
>>> + clock-names:
>>> + items:
>>> + - const: cfg_noc
>>> + - const: core
>>> + - const: iface
>>> + - const: mock_utmi
>>> + - const: sleep
>>> +
>>> + assigned-clocks:
>>> + items:
>>> + - description: Phandle to MOCK_UTMI_CLK.
>>> + - description: Phandle to MASTER_CLK.
>> It's a phandle and clock specifier pair, not always just a phandle.
>> Maybe the base schema can enforce that somehow, but the description
>> isn't accurate.
> will do in next version
>>
>>> +
>>> + assigned-clock-rates:
>>> + items:
>>> + - description: Must be 19.2MHz (19200000).
>>> + - description: Must be >= 60 MHz in HS mode, >= 125 MHz in SS
>>> mode.
>> Can this be more strict? I see in [1] that it was suggested to update
>> the schema checker. Did you try that?
>
> Tried that but need to add maximum value also and even after that
> getting some errors as below.
>
> /Documentation/devicetree/bindings/usb/qcom,dwc3.example.dt.yaml:
> usb@...8800: assigned-clock-rates: Additional items are not allowed
> ([150000000] was unexpected)
>
> /local/mnt/workspace/sandeep/bu_build/src/third_party/kernel/linux-next/Documentation/devicetree/bindings/usb/qcom,dwc3.example.dt.yaml:
> usb@...8800: assigned-clock-rates:0: [19200000] is too short
>>
>>> +
>>> + resets:
>>> + maxItems: 1
>>> +
>>> + interrupts:
>>> + items:
>>> + - description: The interrupt that is asserted
>>> + when a wakeup event is received on USB2 bus.
>>> + - description: The interrupt that is asserted
>>> + when a wakeup event is received on USB3 bus.
>>> + - description: Wakeup event on DM line.
>>> + - description: Wakeup event on DP line.
>>> +
>>> + interrupt-names:
>>> + items:
>>> + - const: hs_phy_irq
>>> + - const: ss_phy_irq
>>> + - const: dm_hs_phy_irq
>>> + - const: dp_hs_phy_irq
>>> +
>>> + qcom,select-utmi-as-pipe-clk:
>>> + description:
>>> + If present, disable USB3 pipe_clk requirement.
>>> + Used when dwc3 operates without SSPHY and only
>>> + HS/FS/LS modes are supported.
>>> + type: boolean
>>> +
>>> +# Required child node:
>>> +
>>> +patternProperties:
>>> + "^dwc3@[0-9a-f]+$":
>>> + type: object
>>> + description:
>>> + A child node must exist to represent the core DWC3 IP block
>>> + The content of the node is defined in dwc3.txt.
>>> +
>>> +required:
>>> + - compatible
>>> + - reg
>>> + - "#address-cells"
>>> + - "#size-cells"
>>> + - power-domains
>>> + - clocks
>>> + - clock-names
>> Why aren't interrupts required? They're always present, aren't they?
> In qcom,dwc3.txt file interrupts are mentioned in Optional properties
> and I also didnt find any interrupts in 8996.dtsi
>>
>>> +
>>> +examples:
>>> + - |
>>> + #include <dt-bindings/clock/qcom,gcc-sdm845.h>
>>> + #include <dt-bindings/interrupt-controller/arm-gic.h>
>> It would be good to include <dt-bindings/interrupt-controller/irq.h>
>> here too, just in case someone wants to move that include out of
>> arm-gic.h, which is possible.
>>
>>> + usb_1: usb@...8800 {
>> Can we drop the phandle? It's not used.
> will do in next version
>>
>>> + compatible = "qcom,sdm845-dwc3", "qcom,dwc3";
>>> + reg = <0 0x0a6f8800 0 0x400>;
>>> +
>>> + #address-cells = <2>;
>>> + #size-cells = <2>;
>>> +
>>> + clocks = <&gcc GCC_CFG_NOC_USB3_PRIM_AXI_CLK>,
>>> + <&gcc GCC_USB30_PRIM_MASTER_CLK>,
>>> + <&gcc GCC_AGGRE_USB3_PRIM_AXI_CLK>,
>>> + <&gcc GCC_USB30_PRIM_MOCK_UTMI_CLK>,
>>> + <&gcc GCC_USB30_PRIM_SLEEP_CLK>;
>>> + clock-names = "cfg_noc", "core", "iface", "mock_utmi",
>>> + "sleep";
>> Spacing looks off. Are there tabs?
> will correct in next version
>>
>>> +
>>> + assigned-clocks = <&gcc GCC_USB30_PRIM_MOCK_UTMI_CLK>,
>>> + <&gcc GCC_USB30_PRIM_MASTER_CLK>;
>>> + assigned-clock-rates = <19200000>, <150000000>;
>>> +
>>> + interrupts = <GIC_SPI 131 IRQ_TYPE_LEVEL_HIGH>,
>>> + <GIC_SPI 486 IRQ_TYPE_LEVEL_HIGH>,
>>> + <GIC_SPI 488 IRQ_TYPE_LEVEL_HIGH>,
>>> + <GIC_SPI 489 IRQ_TYPE_LEVEL_HIGH>;
>>> + interrupt-names = "hs_phy_irq", "ss_phy_irq",
>>> + "dm_hs_phy_irq", "dp_hs_phy_irq";
>> Same spacing nit
> will correct in next version
>>
>>> +
>>> + power-domains = <&gcc USB30_PRIM_GDSC>;
>>> +
>>> + resets = <&gcc GCC_USB30_PRIM_BCR>;
>>> +
>>> + usb_1_dwc3: dwc3@...0000 {
>> Drop this phandle too? It isn't used.
> will correct in next version
>>
>>> + compatible = "snps,dwc3";
>>> + reg = <0 0x0a600000 0 0xcd00>;
>>> + interrupts = <GIC_SPI 133 IRQ_TYPE_LEVEL_HIGH>;
>>> + iommus = <&apps_smmu 0x740 0>;
>>> + snps,dis_u2_susphy_quirk;
>>> + snps,dis_enblslpm_quirk;
>>> + phys = <&usb_1_hsphy>, <&usb_1_ssphy>;
>>> + phy-names = "usb2-phy", "usb3-phy";
>>> + };
>> [1] https://lkml.kernel.org/r/20191218221310.GA4624@bogus
>
--
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