linux-kernel - [RFC 05/11] dt-bindings: soc: realtek: rtd1195-chip: Extend reg property

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Date:   Sun,  3 Nov 2019 02:36:39 +0100
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,
        Andreas Färber <afaerber@...e.de>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org
Subject: [RFC 05/11] dt-bindings: soc: realtek: rtd1195-chip: Extend reg property

Allow to optionally specify a second register to identify the chip.
Whether needed and which register to specify depends on the family;
RTD1295 family will want the CHIP_INFO1 register.

Signed-off-by: Andreas Färber <afaerber@...e.de>
---
 A SoC specific binding would defeat the purpose of the generic Linux driver;
 is it possible to check the root node's compatible in an if: expression
 to prohibit using more than one reg on "realtek,rtd1195"?
 
 .../devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml  | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml b/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml
index 565ad2419553..e431cf559b66 100644
--- a/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml
+++ b/Documentation/devicetree/bindings/soc/realtek/realtek,rtd1195-chip.yaml
@@ -11,13 +11,15 @@ maintainers:
 
 description: |
   The Realtek SoCs have some registers to identify the chip and revision.
+  To identify the exact model within a family, further registers are needed.
 
 properties:
   compatible:
     const: "realtek,rtd1195-chip"
 
   reg:
-    maxItems: 1
+    minItems: 1
+    maxItems: 2
 
 required:
   - compatible
@@ -29,4 +31,10 @@ examples:
         compatible = "realtek,rtd1195-chip";
         reg = <0x1801a200 0x8>;
     };
+  - |
+    chip-info@...1a200 {
+        compatible = "realtek,rtd1195-chip";
+        reg = <0x9801a200 0x8>,
+              <0x98007028 0x4>;
+    };
 ...
-- 
2.16.4