Re: [PATCH v2 1/2] dt-bindings: remoteproc: Add fsl,imx-dsp-rproc binding document

Hi Rob

On Thu, Sep 2, 2021 at 11:17 PM Rob Herring [off-list ref] wrote:

On Wed, Aug 25, 2021 at 03:28:35PM +0800, Shengjiu Wang wrote:

quoted

Define the compatible string and properties needed by imx_dsp_rproc
driver.

Signed-off-by: Shengjiu Wang <redacted>
---
changes in v2:
- add items for clock-names
- change syscon to fsl,dsp-ctrl

 .../remoteproc/fsl,imx-dsp-rproc.yaml         | 150 ++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/fsl,imx-dsp-rproc.yaml

diff --git a/Documentation/devicetree/bindings/remoteproc/fsl,imx-dsp-rproc.yaml b/Documentation/devicetree/bindings/remoteproc/fsl,imx-dsp-rproc.yaml
new file mode 100644
index 000000000000..edf6e4b8d7bb
--- /dev/null
+++ b/Documentation/devicetree/bindings/remoteproc/fsl,imx-dsp-rproc.yaml

@@ -0,0 +1,150 @@
+# SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/remoteproc/fsl,imx-dsp-rproc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: i.MX DSP Remoteproc Devices
+
+maintainers:
+  - Shengjiu Wang <shengjiu.wang@nxp.com>
+
+description:
+  This binding provides support for DSP processors found on i.mX family of SoCs

i.MX

I will update it.

quoted

+
+properties:
+  compatible:
+    enum:
+      - fsl,imx8qxp-hifi4
+      - fsl,imx8qm-hifi4
+      - fsl,imx8mp-hifi4
+      - fsl,imx8ulp-hifi4
+
+  clocks:
+    description:
+      Main functional clock for the remote processor
+    minItems: 1
+    maxItems: 32
+
+  clock-names:
+    description: |
+      List of clock names for the remote processor.
+      dsp_clkx for clocks of dsp itself.
+      per_clkx for clocks of peripherals used by dsp.

I still don't like your random collection of clocks. What if you have
other resources besides clocks to manage? Pin mux, resets, power
domains, etc. It would be better if you describe the peripherals in DT
and then link to them here. But maybe the devices themselves aren't
visible?

Ok,  I will remove these per_clks in next version.
Maybe it is better to handle them in firmware side.

quoted

+    minItems: 1
+    maxItems: 26
+    items:
+      - const: dsp_clk1
+      - const: dsp_clk2
+      - const: dsp_clk3
+      - const: dsp_clk4
+      - const: dsp_clk5
+      - const: dsp_clk6
+      - const: dsp_clk7
+      - const: dsp_clk8

Surely you can name these by function? e.g. core, bus, axi, etc.

Ok, I will update them in next version.

Thanks for reviewing.

Best regards
Wang shengjiu

quoted

+      - const: per_clk1
+      - const: per_clk2
+      - const: per_clk3
+      - const: per_clk4
+      - const: per_clk5
+      - const: per_clk6
+      - const: per_clk7
+      - const: per_clk8
+      - const: per_clk9
+      - const: per_clk10
+      - const: per_clk11
+      - const: per_clk12
+      - const: per_clk13
+      - const: per_clk14
+      - const: per_clk15
+      - const: per_clk16
+      - const: per_clk17
+      - const: per_clk18
+
+  fsl,dsp-ctrl:
+    $ref: /schemas/types.yaml#/definitions/phandle
+    description:
+      Phandle to syscon block which provide access for processor enablement
+
+  mbox-names:
+    items:
+      - const: tx
+      - const: rx
+      - const: rxdb
+
+  mboxes:
+    description:
+      This property is required only if the rpmsg/virtio functionality is used.
+      List of <&phandle type channel> - 1 channel for TX, 1 channel for RX, 1 channel for RXDB.
+      (see mailbox/fsl,mu.yaml)
+    minItems: 1
+    maxItems: 3
+
+  firmware-name:
+    description: |
+      Default name of the firmware to load to the remote processor.
+
+  memory-region:
+    description:
+      If present, a phandle for a reserved memory area that used for vdev buffer,
+      resource table, vring region and others used by remote processor.
+    minItems: 1
+    maxItems: 32
+
+  reg:
+    description: |
+      Address space for any remoteproc memories present on the SoC.
+
+  power-domains:
+    minItems: 1
+    maxItems: 32
+
+required:
+  - compatible
+  - reg
+  - mboxes
+  - mbox-names
+  - clocks
+  - clock-names
+  - firmware-name
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/imx8mp-clock.h>
+    dsp_reserved: dsp@92400000 {
+      reg = <0x92400000 0x1000000>;
+      no-map;
+    };
+    dsp_vdev0vring0: vdev0vring0@942f0000 {
+      reg = <0x942f0000 0x8000>;
+      no-map;
+    };
+    dsp_vdev0vring1: vdev0vring1@942f8000 {
+      reg = <0x942f8000 0x8000>;
+      no-map;
+    };
+    dsp_vdev0buffer: vdev0buffer@94300000 {
+      compatible = "shared-dma-pool";
+      reg = <0x94300000 0x100000>;
+      no-map;
+    };
+
+    dsp: dsp@3b6e8000 {
+      compatible = "fsl,imx8mp-hifi4";
+      reg = <0x3B6E8000 0x88000>;
+      clocks = <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_OCRAMA_IPG>,
+               <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_DSP_ROOT>,
+               <&audio_blk_ctrl IMX8MP_CLK_AUDIOMIX_DSPDBG_ROOT>;
+      clock-names = "dsp_clk1", "dsp_clk2", "dsp_clk3";
+      firmware-name = "imx/dsp/hifi4.bin";
+      power-domains = <&audiomix_pd>;
+      mbox-names = "tx", "rx", "rxdb";
+      mboxes = <&mu2 0 0>,
+               <&mu2 1 0>,
+               <&mu2 3 0>;
+      memory-region = <&dsp_vdev0buffer>, <&dsp_vdev0vring0>,
+                      <&dsp_vdev0vring1>, <&dsp_reserved>;
+      fsl,dsp-ctrl = <&audio_blk_ctrl>;
+    };
--
2.17.1