Re: [PATCH v3 01/17] dt-bindings: qcom-bam: Convert binding to YAML

On Thu, Jun 3, 2021 at 9:27 PM Bhupesh Sharma [off-list ref] wrote:

Hello Rob,

Thanks for the review and sorry for the late reply.

On Fri, 21 May 2021 at 07:13, Rob Herring [off-list ref] wrote:

quoted

On Wed, May 19, 2021 at 08:06:44PM +0530, Bhupesh Sharma wrote:

quoted

Convert Qualcomm BAM DMA devicetree binding to YAML.

Cc: Thara Gopinath <redacted>
Cc: Bjorn Andersson <redacted>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Andy Gross <agross@kernel.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David S. Miller <davem@davemloft.net>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Michael Turquette <redacted>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: dmaengine@vger.kernel.org
Cc: linux-clk@vger.kernel.org
Cc: linux-crypto@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: bhupesh.linux@gmail.com
Signed-off-by: Bhupesh Sharma <redacted>
---
 .../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@f9984000 = {
-             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@f991e000 {
-             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@linaro.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

Can we keep the SoC association please.

The original bam dma bindings are as per the underlying bam IP
version, so I would prefer that we keep it this way for this series.

Later on I can send a patchset to convert the bam DMA dt-bindings, dts
and driver to work with 'SoC association' instead.

I just mean keep a comment with the mapping of versions to SoC:

quoted

quoted

- * "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

Otherwise, we are losing that information.

Rob