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Date: Fri, 18 Dec 2020 20:00:16 +0100 From: Erwan Le Ray <erwan.leray@...s.st.com> To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jslaby@...e.com>, Rob Herring <robh+dt@...nel.org>, Maxime Coquelin <mcoquelin.stm32@...il.com>, Alexandre Torgue <alexandre.torgue@...s.st.com> CC: <linux-serial@...r.kernel.org>, <devicetree@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>, <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>, Erwan Le Ray <erwan.leray@...s.st.com>, Fabrice Gasnier <fabrice.gasnier@...s.st.com>, Valentin Caron <valentin.caron@...s.st.com> Subject: [PATCH 5/8] dt-bindings: serial: stm32: update rts-gpios and cts-gpios Update rts-gpios and cts-gpios: - remove max-items as already defined in serial.yaml - add a note describing rts-gpios and cts-gpios usage with stm32 Document the use of cts-gpios and rts-gpios for flow control in STM32 UART controller. These properties can be used instead of 'uart-has-rtscts' or 'st,hw-flow-ctrl' (deprecated) for making use of any gpio pins for flow control instead of dedicated pins. It should be noted that both cts-gpios/rts-gpios and 'uart-has-rtscts' or 'st,hw-flow-ctrl' (deprecated) properties cannot co-exist in a design. Signed-off-by: Erwan Le Ray <erwan.leray@...s.st.com> diff --git a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml index 06d5f251ec88..8631678283f9 100644 --- a/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml +++ b/Documentation/devicetree/bindings/serial/st,stm32-uart.yaml @@ -50,11 +50,14 @@ properties: minItems: 1 maxItems: 2 - cts-gpios: - maxItems: 1 - - rts-gpios: - maxItems: 1 +# cts-gpios and rts-gpios properties can be used instead of 'uart-has-rtscts' +# or 'st,hw-flow-ctrl' (deprecated) for making use of any gpio pins for flow +# control instead of dedicated pins. +# +# It should be noted that both cts-gpios/rts-gpios and 'uart-has-rtscts' or +# 'st,hw-flow-ctrl' (deprecated) properties cannot co-exist in a design. + cts-gpios: true + rts-gpios: true wakeup-source: true -- 2.17.1
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