6.15-stable review patch. If anyone has any objections, please let me know.
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From: Yao Zi ziyao@disroot.org
commit 09812134071b3941fb81def30b61ed36d3a5dfb5 upstream.
The 8250 binding before converting to json-schema states,
- clock-frequency : the input clock frequency for the UART or - clocks phandle to refer to the clk used as per Documentation/devicetree
for clock-related properties, where "or" indicates these properties shouldn't exist at the same time.
Additionally, the behavior of Linux's driver is strange when both clocks and clock-frequency are specified: it ignores clocks and obtains the frequency from clock-frequency, left the specified clocks unclaimed. It may even be disabled, which is undesired most of the time.
But "anyOf" doesn't prevent these two properties from coexisting, as it considers the object valid as long as there's at LEAST one match.
Let's switch to "oneOf" and disallows the other property if one exists, precisely matching the original binding and avoiding future confusion on the driver's behavior.
Fixes: e69f5dc623f9 ("dt-bindings: serial: Convert 8250 to json-schema") Cc: stable stable@kernel.org Signed-off-by: Yao Zi ziyao@disroot.org Reviewed-by: Conor Dooley conor.dooley@microchip.com Link: https://lore.kernel.org/r/20250623093445.62327-1-ziyao@disroot.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- Documentation/devicetree/bindings/serial/8250.yaml | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/Documentation/devicetree/bindings/serial/8250.yaml +++ b/Documentation/devicetree/bindings/serial/8250.yaml @@ -45,7 +45,7 @@ allOf: - ns16550 - ns16550a then: - anyOf: + oneOf: - required: [ clock-frequency ] - required: [ clocks ]