Add DT compatible string for NXP FRDM-IMX91S board

The FRDM-IMX91S is a low-cost, compact development board based on the
i.MX91 applications processor. It is a cost-optimized variant of the
FRDM-IMX91 board, with notable hardware differences requiring a separate
DTS:
- 512MB LPDDR4 (FRDM-IMX91 uses 1GB)
- 256MB FlexSPI-NAND (FRDM-IMX91 uses 8GB eMMC)
- Single GbE port (FRDM-IMX91 has dual GbE)
- PMIC PF9453 (FRDM-IMX91 uses PCA9451A)

Signed-off-by: Yanan Yang <yanan.yang@nxp.com>

---
Changes in v2:
- Correct author name: removed extra period in "Yanan.Yang"
- Refined commit message to clarify board differences
---
 Documentation/devicetree/bindings/arm/fsl.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/arm/fsl.yaml b/Documentation/devicetree/bindings/arm/fsl.yaml
index 68a2d5fecc43..82f28be401b8 100644
--- a/Documentation/devicetree/bindings/arm/fsl.yaml
+++ b/Documentation/devicetree/bindings/arm/fsl.yaml
@@ -1412,6 +1412,7 @@ properties:
         items:
           - enum:
               - fsl,imx91-11x11-evk       # i.MX91 11x11 EVK Board
+              - fsl,imx91-11x11-frdm-s    # FRDM-IMX91S Board
           - const: fsl,imx91
 
       - description: i.MX93 based Boards

-- 
2.43.0

On 15/12/2025 09:42, Yanan Yang wrote:
> Add DT compatible string for NXP FRDM-IMX91S board
> 
> The FRDM-IMX91S is a low-cost, compact development board based on the
> i.MX91 applications processor. It is a cost-optimized variant of the
> FRDM-IMX91 board, with notable hardware differences requiring a separate
> DTS:
> - 512MB LPDDR4 (FRDM-IMX91 uses 1GB)
> - 256MB FlexSPI-NAND (FRDM-IMX91 uses 8GB eMMC)
> - Single GbE port (FRDM-IMX91 has dual GbE)
> - PMIC PF9453 (FRDM-IMX91 uses PCA9451A)
> 
> Signed-off-by: Yanan Yang <yanan.yang@nxp.com>
> 


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>


Best regards,
Krzysztof