linux-kernel - [PATCH] dt-bindings: serial: Allow fsl,ns16550 with broken FIFOs

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Message-Id: <20250209-uartfifo-v1-1-501a510a5f07@posteo.net>
Date: Sun, 09 Feb 2025 23:13:40 +0100
From: J. Neuschäfer via B4 Relay <devnull+j.ne.posteo.net@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Jiri Slaby <jirislaby@...nel.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Lubomir Rintel <lkundrak@...sk>, 
 devicetree@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org, 
 J. Neuschäfer <j.ne@...teo.net>
Subject: [PATCH] dt-bindings: serial: Allow fsl,ns16550 with broken FIFOs

From: "J. Neuschäfer" <j.ne@...teo.net>

While testing on a Freescale MPC8314E board, I noticed that changing
the UART compatible string from ns16550 to ns16550a breaks the output,
suggesting that the FIFOs don't work correctly. To accommodate this
fact, move the definition of fsl,ns16550 to the section of 8250.yaml
that allows broken FIFOs.

Signed-off-by: J. Neuschäfer <j.ne@...teo.net>
---
 Documentation/devicetree/bindings/serial/8250.yaml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/serial/8250.yaml b/Documentation/devicetree/bindings/serial/8250.yaml
index 0bde2379e864749a20a2e1c962103bf8f5299e42..dc0d52920575ff851a24e56b808e50ee3a14743b 100644
--- a/Documentation/devicetree/bindings/serial/8250.yaml
+++ b/Documentation/devicetree/bindings/serial/8250.yaml
@@ -77,7 +77,6 @@ properties:
               - altr,16550-FIFO64
               - altr,16550-FIFO128
               - fsl,16550-FIFO64
-              - fsl,ns16550
               - andestech,uart16550
               - nxp,lpc1850-uart
               - opencores,uart16550-rtlsvn105
@@ -86,6 +85,7 @@ properties:
       - items:
           - enum:
               - ns16750
+              - fsl,ns16550
               - cavium,octeon-3860-uart
               - xlnx,xps-uart16550-2.00.b
               - ralink,rt2880-uart

---
base-commit: b142aa50047767e0ab2739102e913fff8207cae1
change-id: 20250209-uartfifo-57ba68a86d5a

Best regards,
-- 
J. Neuschäfer <j.ne@...teo.net>