From: Erwan Le Ray <erwan.leray@foss.st.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>, Rob Herring <robh+dt@kernel.org>,
Maxime Coquelin <mcoquelin.stm32@gmail.com>,
Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: <linux-serial@vger.kernel.org>, <devicetree@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>,
Erwan Le Ray <erwan.leray@foss.st.com>,
Fabrice Gasnier <fabrice.gasnier@foss.st.com>,
Valentin Caron <valentin.caron@foss.st.com>
Subject: [PATCH v2 5/8] dt-bindings: serial: stm32: update rts-gpios and cts-gpios
Date: Wed, 6 Jan 2021 17:22:00 +0100 [thread overview]
Message-ID: <20210106162203.28854-6-erwan.leray@foss.st.com> (raw)
In-Reply-To: <20210106162203.28854-1-erwan.leray@foss.st.com>
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.
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Erwan Le Ray <erwan.leray@foss.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
next prev parent reply other threads:[~2021-01-06 16:24 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-06 16:21 [PATCH 0/7] STM32 uart cleanup and improvements Erwan Le Ray
2021-01-06 16:21 ` [PATCH v2 1/8] serial: stm32: fix DMA initialization error handling Erwan Le Ray
2021-01-06 16:21 ` [PATCH v2 2/8] serial: stm32: fix code cleaning warnings and checks Erwan Le Ray
2021-01-11 9:58 ` Jiri Slaby
2021-01-12 10:02 ` Erwan LE RAY
2021-01-12 10:24 ` Greg Kroah-Hartman
2021-01-06 16:21 ` [PATCH v2 3/8] serial: stm32: add "_usart" prefix in functions name Erwan Le Ray
2021-01-06 16:21 ` [PATCH v2 4/8] serial: stm32: add author Erwan Le Ray
2021-01-11 9:59 ` Jiri Slaby
2021-01-06 16:22 ` Erwan Le Ray [this message]
2021-01-06 16:22 ` [PATCH v2 6/8] serial: stm32: update conflicting RTS/CTS config comment Erwan Le Ray
2021-01-06 16:22 ` [PATCH v2 7/8] serial: stm32: clean probe and remove port deinit Erwan Le Ray
2021-01-06 16:22 ` [PATCH v2 8/8] serial: stm32: update transmission complete error message in shutdown Erwan Le Ray
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