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Date: Wed, 13 Oct 2021 15:56:52 +0300
From: Vladimir Zapolskiy <vladimir.zapolskiy@...aro.org>
To: Bhupesh Sharma <bhupesh.sharma@...aro.org>,
linux-arm-msm@...r.kernel.org, linux-crypto@...r.kernel.org
Cc: bhupesh.linux@...il.com, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org, robh+dt@...nel.org, agross@...nel.org,
herbert@...dor.apana.org.au, davem@...emloft.net,
Thara Gopinath <thara.gopinath@...aro.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>
Subject: Re: [PATCH v4 04/20] dt-bindings: qcom-bam: Convert binding to YAML
Hi Bhupesh,
On 10/13/21 1:55 PM, Bhupesh Sharma wrote:
> Convert Qualcomm BAM DMA devicetree binding to YAML.
>
> Cc: Thara Gopinath <thara.gopinath@...aro.org>
> Cc: Bjorn Andersson <bjorn.andersson@...aro.org>
> Cc: Rob Herring <robh+dt@...nel.org>
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
> .../devicetree/bindings/dma/qcom_bam_dma.txt | 50 -----------
> .../devicetree/bindings/dma/qcom_bam_dma.yaml | 89 +++++++++++++++++++
> 2 files changed, 89 insertions(+), 50 deletions(-)
> delete mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> create mode 100644 Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
>
> diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt b/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> deleted file mode 100644
> index cf5b9e44432c..000000000000
> --- a/Documentation/devicetree/bindings/dma/qcom_bam_dma.txt
> +++ /dev/null
> @@ -1,50 +0,0 @@
> -QCOM BAM DMA controller
> -
> -Required properties:
> -- compatible: must be one of the following:
> - * "qcom,bam-v1.4.0" for MSM8974, APQ8074 and APQ8084
> - * "qcom,bam-v1.3.0" for APQ8064, IPQ8064 and MSM8960
> - * "qcom,bam-v1.7.0" for MSM8916
> -- reg: Address range for DMA registers
> -- interrupts: Should contain the one interrupt shared by all channels
> -- #dma-cells: must be <1>, the cell in the dmas property of the client device
> - represents the channel number
> -- clocks: required clock
> -- clock-names: must contain "bam_clk" entry
> -- qcom,ee : indicates the active Execution Environment identifier (0-7) used in
> - the secure world.
> -- qcom,controlled-remotely : optional, indicates that the bam is controlled by
> - remote proccessor i.e. execution environment.
> -- num-channels : optional, indicates supported number of DMA channels in a
> - remotely controlled bam.
> -- qcom,num-ees : optional, indicates supported number of Execution Environments
> - in a remotely controlled bam.
> -
> -Example:
> -
> - uart-bam: dma@...84000 = {
> - compatible = "qcom,bam-v1.4.0";
> - reg = <0xf9984000 0x15000>;
> - interrupts = <0 94 0>;
> - clocks = <&gcc GCC_BAM_DMA_AHB_CLK>;
> - clock-names = "bam_clk";
> - #dma-cells = <1>;
> - qcom,ee = <0>;
> - };
> -
> -DMA clients must use the format described in the dma.txt file, using a two cell
> -specifier for each channel.
> -
> -Example:
> - serial@...1e000 {
> - compatible = "qcom,msm-uart";
> - reg = <0xf991e000 0x1000>
> - <0xf9944000 0x19000>;
> - interrupts = <0 108 0>;
> - clocks = <&gcc GCC_BLSP1_UART2_APPS_CLK>,
> - <&gcc GCC_BLSP1_AHB_CLK>;
> - clock-names = "core", "iface";
> -
> - dmas = <&uart-bam 0>, <&uart-bam 1>;
> - dma-names = "rx", "tx";
> - };
> diff --git a/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> new file mode 100644
> index 000000000000..32b47e3b7769
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> @@ -0,0 +1,89 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/dma/qcom_bam_dma.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: QCOM BAM DMA controller binding
> +
> +maintainers:
> + - Bhupesh Sharma <bhupesh.sharma@...aro.org>
> +
> +description: |
> + This document defines the binding for the BAM DMA controller
> + found on Qualcomm parts.
> +
> +allOf:
> + - $ref: "dma-controller.yaml#"
> +
> +properties:
> + compatible:
> + enum:
> + - qcom,bam-v1.4.0 # for MSM8974, APQ8074 and APQ8084
> + - qcom,bam-v1.3.0 # for APQ8064, IPQ8064 and MSM8960
> + - qcom,bam-v1.7.0 # for MSM8916
would it be better to sort the list above by IP version?
> +
> + reg:
> + maxItems: 1
> +
> + clocks:
> + maxItems: 1
> +
> + clock-names:
> + const: bam_clk
> +
> + interrupts:
> + minItems: 1
> + maxItems: 31
> +
> + num-channels:
> + maximum: 31
> + description: |
> + Indicates supported number of DMA channels in a remotely controlled bam.
A comment about YAML specifics, I'm not sure, if it makes sense to set a control
to enable literal style of the given multiline description, since it is a one-liner.
My main observation though is that all actually multi-line descriptions in the
schema are different and of the folded style ("pipe" symbol is not set).
Probably it's good enough just to remove the "pipe" above.
> +
> + "#dma-cells":
> + const: 1
> + description: The single cell represents the channel index.
> +
> + qcom,ee:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + description:
> + Indicates the active Execution Environment identifier (0-7)
> + used in the secure world.
Would it make sense to add here
minimum: 0
maximum: 7
?
> +
> + qcom,controlled-remotely:
> + $ref: /schemas/types.yaml#/definitions/flag
> + description:
> + Indicates that the bam is controlled by remote proccessor i.e.
> + execution environment.
> +
> + qcom,num-ees:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + minimum: 0
> + maximum: 31
> + default: 2
> + description:
> + Indicates supported number of Execution Environments in a
> + remotely controlled bam.
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - "#dma-cells"
> + - qcom,ee
> +
> +additionalProperties: false
> +
> +examples:
> + - |
> + #include <dt-bindings/clock/qcom,gcc-msm8974.h>
> + dma-controller@...84000 {
> + compatible = "qcom,bam-v1.4.0";
> + reg = <0xf9984000 0x15000>;
> + interrupts = <0 94 0>;
> + clocks = <&gcc GCC_BAM_DMA_AHB_CLK>;
> + clock-names = "bam_clk";
> + #dma-cells = <1>;
> + qcom,ee = <0>;
> + };
>
--
Best wishes,
Vladimir
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