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

Andreas Färber
2019-11-03T01:36:59Z

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@suse.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@9801a200 {
+ compatible = "realtek,rtd1195-chip";
+ reg = <0x9801a200 0x8>,
+ <0x98007028 0x4>;
+ };
...
--
2.16.4