linux-kernel - [PATCH 2/2] dt-bindings: dsp: fsl: Add DSP optional clocks documentation

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Date:   Thu,  2 Sep 2021 15:32:16 +0300
From:   Daniel Baluta <daniel.baluta@....nxp.com>
To:     broonie@...nel.org, pierre-louis.bossart@...ux.intel.com,
        lgirdwood@...il.com, robh+dt@...nel.org, devicetree@...r.kernel.org
Cc:     ranjani.sridharan@...ux.intel.com, kai.vehmanen@...ux.intel.com,
        shawnguo@...nel.org, kernel@...gutronix.de, festevam@...il.com,
        linux-imx@....com, peter.ujfalusi@...ux.intel.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        s-anna@...com, Daniel Baluta <daniel.baluta@....com>
Subject: [PATCH 2/2] dt-bindings: dsp: fsl: Add DSP optional clocks documentation

From: Daniel Baluta <daniel.baluta@....com>

DSP node on the Linux kernel side must also take care of enabling
DAI/DMA related clocks.

By design we choose to manage DAI/DMA clocks from the kernel side because of
the architecture of some i.MX8 boards.

Clocks are handled by a special M4 core which runs a special firmware
called SCFW (System Controler firmware).

This communicates with A cores running Linux via a special Messaging
Unit and implements a custom API which is already implemented by the
Linux kernel i.MX clocks implementation.

Note that these clocks are optional. We can use the DSP without them.

Signed-off-by: Daniel Baluta <daniel.baluta@....com>
---
 .../devicetree/bindings/dsp/fsl,dsp.yaml      | 33 +++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml b/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
index 7afc9f2be13a..1453668c0194 100644
--- a/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
+++ b/Documentation/devicetree/bindings/dsp/fsl,dsp.yaml
@@ -24,16 +24,49 @@ properties:
     maxItems: 1
 
   clocks:
+    minItems: 3
     items:
       - description: ipg clock
       - description: ocram clock
       - description: core clock
+      - description: esai0 core clock for accessing registers
+      - description: esai0 baud clock
+      - description: esai0 system clock
+      - description: esai0 spba clock required when ESAI is placed in slave mode
+      - description: SAI1 bus clock
+      - description: SAI1 master clock 0
+      - description: SAI1 master clock 1
+      - description: SAI1 master clock 2
+      - description: SAI1 master clock 3
+      - description: SAI3 bus clock
+      - description: SAI3 master clock 0
+      - description: SAI3 master clock 1
+      - description: SAI3 master clock 2
+      - description: SAI3 master clock 3
+      - description: SDMA3 root clock used for accessing registers
+
 
   clock-names:
+    minItems: 3
     items:
       - const: ipg
       - const: ocram
       - const: core
+      - const: esai0_core
+      - const: esai0_extal
+      - const: esai0_fsys
+      - const: esai0_spba
+      - const: sai1_bus
+      - const: sai1_mclk0
+      - const: sai1_mclk1
+      - const: sai1_mclk2
+      - const: sai1_mclk3
+      - const: sai3_bus
+      - const: sai3_mclk0
+      - const: sai3_mclk1
+      - const: sai3_mclk2
+      - const: sai3_mclk3
+      - const: smda3_root
 
   power-domains:
     description:
-- 
2.27.0