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Message-ID: <41efd28c-ff64-2b9f-2cdc-ac4aaaeb4611@arm.com>
Date: Thu, 4 Feb 2021 11:35:43 +0000
From: Robin Murphy <robin.murphy@....com>
To: Johan Jonker <jbx6244@...il.com>, heiko@...ech.de,
Elaine Zhang <zhangqing@...k-chips.com>
Cc: devicetree@...r.kernel.org, balbi@...nel.org,
gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-rockchip@...ts.infradead.org,
robh+dt@...nel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/7] dt-bindings: usb: convert rockchip,dwc3.txt to
yaml
On 2021-02-03 16:52, Johan Jonker wrote:
> In the past Rockchip dwc3 usb nodes were manually checked.
> With the conversion of snps,dwc3.yaml as common document
> we now can convert rockchip,dwc3.txt to yaml as well.
> Remove node wrapper.
>
> Added properties for rk3399 are:
> power-domains
> resets
> reset-names
>
> Signed-off-by: Johan Jonker <jbx6244@...il.com>
> ---
> .../devicetree/bindings/usb/rockchip,dwc3.txt | 56 -----------
> .../devicetree/bindings/usb/rockchip,dwc3.yaml | 103 +++++++++++++++++++++
> 2 files changed, 103 insertions(+), 56 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/usb/rockchip,dwc3.txt
> create mode 100644 Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
>
> diff --git a/Documentation/devicetree/bindings/usb/rockchip,dwc3.txt b/Documentation/devicetree/bindings/usb/rockchip,dwc3.txt
> deleted file mode 100644
> index 945204932..000000000
> --- a/Documentation/devicetree/bindings/usb/rockchip,dwc3.txt
> +++ /dev/null
> @@ -1,56 +0,0 @@
> -Rockchip SuperSpeed DWC3 USB SoC controller
> -
> -Required properties:
> -- compatible: should contain "rockchip,rk3399-dwc3" for rk3399 SoC
> -- clocks: A list of phandle + clock-specifier pairs for the
> - clocks listed in clock-names
> -- clock-names: Should contain the following:
> - "ref_clk" Controller reference clk, have to be 24 MHz
> - "suspend_clk" Controller suspend clk, have to be 24 MHz or 32 KHz
> - "bus_clk" Master/Core clock, have to be >= 62.5 MHz for SS
> - operation and >= 30MHz for HS operation
> - "grf_clk" Controller grf clk
> -
> -Required child node:
> -A child node must exist to represent the core DWC3 IP block. The name of
> -the node is not important. The content of the node is defined in dwc3.txt.
> -
> -Phy documentation is provided in the following places:
> -Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.yaml - USB2.0 PHY
> -Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt - Type-C PHY
> -
> -Example device nodes:
> -
> - usbdrd3_0: usb@...00000 {
> - compatible = "rockchip,rk3399-dwc3";
> - clocks = <&cru SCLK_USB3OTG0_REF>, <&cru SCLK_USB3OTG0_SUSPEND>,
> - <&cru ACLK_USB3OTG0>, <&cru ACLK_USB3_GRF>;
> - clock-names = "ref_clk", "suspend_clk",
> - "bus_clk", "grf_clk";
> - #address-cells = <2>;
> - #size-cells = <2>;
> - ranges;
> - usbdrd_dwc3_0: dwc3@...00000 {
> - compatible = "snps,dwc3";
> - reg = <0x0 0xfe800000 0x0 0x100000>;
> - interrupts = <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
> - dr_mode = "otg";
> - };
> - };
> -
> - usbdrd3_1: usb@...00000 {
> - compatible = "rockchip,rk3399-dwc3";
> - clocks = <&cru SCLK_USB3OTG1_REF>, <&cru SCLK_USB3OTG1_SUSPEND>,
> - <&cru ACLK_USB3OTG1>, <&cru ACLK_USB3_GRF>;
> - clock-names = "ref_clk", "suspend_clk",
> - "bus_clk", "grf_clk";
> - #address-cells = <2>;
> - #size-cells = <2>;
> - ranges;
> - usbdrd_dwc3_1: dwc3@...00000 {
> - compatible = "snps,dwc3";
> - reg = <0x0 0xfe900000 0x0 0x100000>;
> - interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_HIGH>;
> - dr_mode = "otg";
> - };
> - };
> diff --git a/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml b/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> new file mode 100644
> index 000000000..fdf9497bc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/usb/rockchip,dwc3.yaml
> @@ -0,0 +1,103 @@
> +# SPDX-License-Identifier: GPL-2.0
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/usb/rockchip,dwc3.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Rockchip SuperSpeed DWC3 USB SoC controller
> +
> +maintainers:
> + - Heiko Stuebner <heiko@...ech.de>
> +
> +description:
> + The common content of the node is defined in snps,dwc3.yaml.
> +
> + Phy documentation is provided in the following places.
> +
> + USB2.0 PHY
> + Documentation/devicetree/bindings/phy/phy-rockchip-inno-usb2.yaml
> +
> + Type-C PHY
> + Documentation/devicetree/bindings/phy/phy-rockchip-typec.txt
> +
> +allOf:
> + - $ref: snps,dwc3.yaml#
> +
> +properties:
> + compatible:
> + items:
> + - enum:
> + - rockchip,rk3399-dwc3
> + - const: snps,dwc3
> +
> + reg:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 1
> +
> + clocks:
> + items:
> + - description:
> + Controller reference clock, must to be 24 MHz
> + - description:
> + Controller suspend clock, must to be 24 MHz or 32 KHz
> + - description:
> + Master/Core clock, must to be >= 62.5 MHz for SS
> + operation and >= 30MHz for HS operation
> + - description:
> + Controller aclk_usb3_rksoc_axi_perf clock
I'm pretty sure these last 3 don't belong to the controller itself,
hence why they were in the glue layer node to being with.
> + - description:
> + Controller aclk_usb3 clock
Does anything in the USB3 block actually consume this clock directly? If
not, then I don't think it needs to be specified since it's already the
parent of the controller's required bus_clk.
I'm similarly suspicious of ACLK_USB3_NOC which is currently marked as
CLK_IGNORE_UNUSED - if that's necessary for USB3 to function then it
probably *should* be specified as part of the glue layer binding here.
Robin.
> + - description:
> + Controller grf clock
> +
> + clock-names:
> + items:
> + - const: ref_clk
> + - const: suspend_clk
> + - const: bus_clk
> + - const: aclk_usb3_rksoc_axi_perf
> + - const: aclk_usb3
> + - const: grf_clk
> +
> + power-domains:
> + maxItems: 1
> +
> + resets:
> + maxItems: 1
> +
> + reset-names:
> + const: usb3-otg
> +
> +unevaluatedProperties: false
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - clocks
> + - clock-names
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/rk3399-cru.h>
> + #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> + bus {
> + #address-cells = <2>;
> + #size-cells = <2>;
> +
> + usbdrd3_0: usb@...00000 {
> + compatible = "rockchip,rk3399-dwc3", "snps,dwc3";
> + reg = <0x0 0xfe800000 0x0 0x100000>;
> + interrupts = <GIC_SPI 105 IRQ_TYPE_LEVEL_HIGH>;
> + clocks = <&cru SCLK_USB3OTG0_REF>, <&cru SCLK_USB3OTG0_SUSPEND>,
> + <&cru ACLK_USB3OTG0>, <&cru ACLK_USB3_RKSOC_AXI_PERF>,
> + <&cru ACLK_USB3>, <&cru ACLK_USB3_GRF>;
> + clock-names = "ref_clk", "suspend_clk",
> + "bus_clk", "aclk_usb3_rksoc_axi_perf",
> + "aclk_usb3", "grf_clk";
> + dr_mode = "otg";
> + };
> + };
>
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