linux-kernel - [RFC PATCH v2 3/6] ASoC: dt-bindings: Extend clock bindings of rt5659

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Date:   Mon, 28 Mar 2022 11:44:07 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     <broonie@...nel.org>, <lgirdwood@...il.com>, <robh+dt@...nel.org>,
        <krzk+dt@...nel.org>, <perex@...ex.cz>, <tiwai@...e.com>,
        <peter.ujfalusi@...ux.intel.com>,
        <pierre-louis.bossart@...ux.intel.com>
CC:     <oder_chiou@...ltek.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <alsa-devel@...a-project.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, Sameer Pujar <spujar@...dia.com>
Subject: [RFC PATCH v2 3/6] ASoC: dt-bindings: Extend clock bindings of rt5659

The rt5658 or rt5659 CODEC system clock (SYSCLK) can be derived from
various clock sources. For example it can be derived either from master
clock (MCLK) or by internal PLL. The internal PLL again can take input
clock references from bit clocks (BCLKs) and MCLK. To enable a flexible
clocking configuration the DT binding is extended here.

It makes use of standard clock bindings and sets up the clock relation
via DT.

Signed-off-by: Sameer Pujar <spujar@...dia.com>
Cc: Oder Chiou <oder_chiou@...ltek.com>
---
 .../devicetree/bindings/sound/realtek,rt5659.yaml  | 53 ++++++++++++++++++++--
 1 file changed, 49 insertions(+), 4 deletions(-)

diff --git a/Documentation/devicetree/bindings/sound/realtek,rt5659.yaml b/Documentation/devicetree/bindings/sound/realtek,rt5659.yaml
index b0485b8..0c2f3cb 100644
--- a/Documentation/devicetree/bindings/sound/realtek,rt5659.yaml
+++ b/Documentation/devicetree/bindings/sound/realtek,rt5659.yaml
@@ -29,12 +29,28 @@ properties:
     maxItems: 1
 
   clocks:
-    items:
-      - description: Master clock (MCLK) to the CODEC
+    description: |
+      CODEC can receive multiple clock inputs like Master
+      clock (MCLK), I2S bit clocks (BCLK1, BCLK2, BCLK3,
+      BCLK4). The CODEC SYSCLK can be generated from MCLK
+      or internal PLL. In turn PLL can reference from MCLK
+      and BCLKs.
 
   clock-names:
-    items:
-      - const: mclk
+    description: |
+      The clock names can be combination of following:
+        "mclk"        : Master clock
+        "pll_ref"     : Reference to CODEC PLL clock
+        "sysclk"      : CODEC SYSCLK
+        "^bclk[1-4]$" : Bit clocks to CODEC
+
+  "#clock-cells":
+    const: 1
+
+  clock-output-names:
+    description: PLL output clock
+    $ref: /schemas/types.yaml#/definitions/string
+    const: rt5659_pll_out
 
   realtek,in1-differential:
     description: MIC1 input is differntial and not single-ended.
@@ -97,6 +113,7 @@ required:
 
 examples:
   - |
+    /* SYSCLK derived from MCLK */
     #include<dt-bindings/gpio/tegra194-gpio.h>
     #include<dt-bindings/clock/tegra194-clock.h>
 
@@ -114,3 +131,31 @@ examples:
             realtek,jd-src = <2>;
         };
     };
+
+  - |
+    /*
+     * SYSCLK is derived from CODEC internal PLL and PLL uses I2S1 BCLK
+     * as the clock reference.
+     */
+    #include<dt-bindings/gpio/tegra194-gpio.h>
+    #include<dt-bindings/clock/tegra194-clock.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        rt5658: audio-codec@1a {
+            compatible = "realtek,rt5658";
+            reg = <0x1a>;
+            interrupt-parent = <&gpio>;
+            interrupts = <TEGRA194_MAIN_GPIO(S, 5) GPIO_ACTIVE_HIGH>;
+            clocks = <&bpmp TEGRA194_CLK_AUD_MCLK>,
+                     <&bpmp TEGRA194_CLK_I2S1>,
+                     <&bpmp TEGRA194_CLK_I2S1>,
+                     <&rt5658 0>;
+            clock-names = "mclk", "bclk1", "pll_ref", "sysclk";
+            #clock-cells = <1>;
+            clock-output-names = "rt5659_pll_out";
+            realtek,jd-src = <2>;
+        };
+    };
-- 
2.7.4