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dt-bindings: nfc: ti,trf7970a: Restrict the ti,rx-gain-reduction-db values

Instead of stating the supported values for the ti,rx-gain-reduction-db
property in free text format, add an enum entry that can help validating
the devicetree files.

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://patch.msgid.link/20250826141736.712827-1-festevam@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

authored by

Fabio Estevam and committed by
Jakub Kicinski 40fb9751 705609de

+2 -1
+2 -1
Documentation/devicetree/bindings/net/nfc/ti,trf7970a.yaml
··· 58 58 ti,rx-gain-reduction-db: 59 59 description: | 60 60 Specify an RX gain reduction to reduce antenna sensitivity with 5dB per 61 - increment, with a maximum of 15dB. Supported values: [0, 5, 10, 15]. 61 + increment, with a maximum of 15dB. 62 + enum: [ 0, 5, 10, 15] 62 63 63 64 required: 64 65 - compatible