linux-kernel - [PATCH v2 05/29] dt-bindings: soc: realtek: rtd1195-chip: Add iso-syscon property

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Date:   Tue, 23 Jun 2020 04:50:42 +0200
From:   Andreas Färber <afaerber@...e.de>
To:     linux-realtek-soc@...ts.infradead.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        James Tai [戴志峰] 
        <james.tai@...ltek.com>,
        Stanley Chang [昌育德] 
        <stanley_chang@...ltek.com>, Edgar Lee <cylee12@...ltek.com>,
        Andreas Färber <afaerber@...e.de>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org
Subject: [PATCH v2 05/29] dt-bindings: soc: realtek: rtd1195-chip: Add iso-syscon property

Allow to optionally specify a phandle to iso syscon to identify the chip.
RTD1295 family will want to check the ISO_CHIP_INFO1 register.

Signed-off-by: Andreas Färber <afaerber@...e.de>
---
 A SoC specific binding would defeat the purpose of the generic Linux driver
 detecting the SoC based on registers.
 Simply allowing it all for SoC families seems the most flexible.
 
 v1 -> v2:
 * Instead of extending reg, allow optional iso-syscon property for RTD129x.
   Iso syscon currently does not have a compatible, and it may need to differ
   across SoC families.
 
 .../bindings/soc/realtek/realtek,rtd1195-chip.yaml       | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml b/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml
index 86a1de214782..dfe33c95f68d 100644
--- a/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml
+++ b/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml
@@ -11,6 +11,7 @@ maintainers:
 
 description: |
   The Realtek DHC SoCs have some registers to identify the chip and revision.
+  To identify the exact model within a family, further registers are needed.
 
 properties:
   compatible:
@@ -19,6 +20,8 @@ properties:
   reg:
     maxItems: 1
 
+  iso-syscon: true
+
 required:
   - compatible
   - reg
@@ -31,4 +34,10 @@ examples:
         compatible = "realtek,rtd1195-chip";
         reg = <0x1801a200 0x8>;
     };
+  - |
+    chip-info@...1a200 {
+        compatible = "realtek,rtd1195-chip";
+        reg = <0x9801a200 0x8>;
+        iso-syscon = <&iso>;
+    };
 ...
-- 
2.26.2