[PATCH v3 1/2] dt-bindings: serial: 8250: add Microchip Core16550

[Kohei Otsuka via B4 Relay]

From: Kohei Otsuka <kohei@xxxxxxxxxxxxxxxxx>

Core16550 is a 16550-compatible UART soft IP core for Microchip FPGAs,
including the fabric of PolarFire SoC. Its registers follow the 16550A,
but it raises no interrupt on TEMT. A driver that knows only ns16550a
waits for one in software RS-485 mode (em485), so RTS stays asserted
after the first frame and the port stops receiving. ns16550a is
therefore not a valid fallback.

Add microchip,core16550-rtl-v3 as a compatible of its own. As for
Microchip's other FPGA fabric cores, the -rtl-v3 suffix is the major
RTL version of the IP, Core16550 3.x.

Link: https://github.com/linux4microchip/meta-mchp/issues/5
Signed-off-by: Kohei Otsuka <kohei@xxxxxxxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/serial/8250.yaml | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml
index 50d5c977afa3..d9ee14f7b694 100644
--- a/Documentation/devicetree/bindings/serial/8250.yaml
+++ b/Documentation/devicetree/bindings/serial/8250.yaml
@@ -111,6 +111,7 @@ properties:
           - aspeed,ast2400-vuart
           - aspeed,ast2500-vuart
           - intel,xscale-uart
+          - microchip,core16550-rtl-v3
           - mrvl,pxa-uart
           - nuvoton,npcm750-uart
           - nuvoton,wpcm450-uart

-- 
2.53.0