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Date: Fri, 21 May 2021 10:08:23 +0200
From: Stephan Gerhold <stephan@...hold.net>
To: Bhupesh Sharma <bhupesh.sharma@...aro.org>
Cc: linux-arm-msm@...r.kernel.org,
Thara Gopinath <thara.gopinath@...aro.org>,
Bjorn Andersson <bjorn.andersson@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Andy Gross <agross@...nel.org>,
Herbert Xu <herbert@...dor.apana.org.au>,
"David S . Miller" <davem@...emloft.net>,
Stephen Boyd <sboyd@...nel.org>,
Michael Turquette <mturquette@...libre.com>,
Vinod Koul <vkoul@...nel.org>, dmaengine@...r.kernel.org,
linux-clk@...r.kernel.org, linux-crypto@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
bhupesh.linux@...il.com
Subject: Re: [PATCH v3 01/17] dt-bindings: qcom-bam: Convert binding to YAML
Hi,
On Wed, May 19, 2021 at 08:06:44PM +0530, 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>
> Cc: Andy Gross <agross@...nel.org>
> Cc: Herbert Xu <herbert@...dor.apana.org.au>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Stephen Boyd <sboyd@...nel.org>
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Vinod Koul <vkoul@...nel.org>
> Cc: dmaengine@...r.kernel.org
> Cc: linux-clk@...r.kernel.org
> Cc: linux-crypto@...r.kernel.org
> Cc: devicetree@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Cc: bhupesh.linux@...il.com
> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@...aro.org>
> ---
> .../devicetree/bindings/dma/qcom_bam_dma.txt | 50 ----------
> .../devicetree/bindings/dma/qcom_bam_dma.yaml | 91 +++++++++++++++++++
> 2 files changed, 91 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..173e4d7508a6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> @@ -0,0 +1,91 @@
> +# 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
> + - qcom,bam-v1.3.0
> + - qcom,bam-v1.7.0
> +
> + reg:
> + maxItems: 1
> + description: Address range of the DMA registers.
> +
> + clocks:
> + minItems: 1
> + maxItems: 8
> +
> + clock-names:
> + const: bam_clk
> +
> + interrupts:
> + maxItems: 1
> + description: Single interrupt line shared by all channels.
> +
> + num-channels:
> + maxItems: 31
maxItems doesn't seem right here, since num-channels isn't an array.
Perhaps you meant maximum: 31?
Can you check your bindings on the existing device trees with
"make dtbs_check" and make sure that only reasonable errors remain?
This fails on pretty much every device tree:
arch/arm64/boot/dts/qcom/apq8096-db820c.dt.yaml: dma-controller@...4000: num-channels: [[31]] is too short
From schema: Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> + description: |
> + Indicates supported number of DMA channels in a remotely controlled bam.
> +
> + "#dma-cells":
> + const: 1
> + description: The single cell represents the channel index.
> +
> + qcom,ee:
> + $ref: /schemas/types.yaml#/definitions/uint8
> + description:
> + Indicates the active Execution Environment identifier (0-7)
> + used in the secure world.
> + enum: [0, 1, 2, 3, 4, 5, 6, 7]
> +
bam_dma.c reads this as uint32 and all existing device tree specify it
as uint32. I don't think adding the /bits/ 8 to all existing device
trees is really worth it.
arch/arm64/boot/dts/qcom/apq8096-db820c.dt.yaml: dma-controller@...4000: qcom,ee: missing size tag in [[1]]
From schema: Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
> + 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
> + description:
> + Indicates supported number of Execution Environments in a
> + remotely controlled bam.
> +
> +required:
> + - compatible
> + - reg
> + - interrupts
> + - clocks
> + - clock-names
clocks is often missing if qcom,controlled-remotely is set, e.g.
slimbam: dma-controller@...4000 {
compatible = "qcom,bam-v1.7.0";
qcom,controlled-remotely;
reg = <0x09184000 0x32000>;
num-channels = <31>;
interrupts = <0 164 IRQ_TYPE_LEVEL_HIGH>;
#dma-cells = <1>;
qcom,ee = <1>;
qcom,num-ees = <2>;
};
arch/arm64/boot/dts/qcom/apq8096-db820c.dt.yaml: dma-controller@...4000: 'clocks' is a required property
From schema: Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
arch/arm64/boot/dts/qcom/apq8096-db820c.dt.yaml: dma-controller@...4000: 'clock-names' is a required property
From schema: Documentation/devicetree/bindings/dma/qcom_bam_dma.yaml
You might be able to encode this with an if: statement (clocks required
if qcom,controlled-remotely not specified), not sure.
Stephan
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