linux-kernel - [PATCH v4 6/9] dt-bindings: sc16is7xx: Add property to change GPIO function

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Message-Id: <20230529140711.896830-7-hugo@hugovil.com>
Date:   Mon, 29 May 2023 10:07:08 -0400
From:   Hugo Villeneuve <hugo@...ovil.com>
To:     gregkh@...uxfoundation.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        jirislaby@...nel.org, jringle@...dpoint.com,
        l.perczak@...lintechnologies.com, tomasz.mon@...lingroup.com
Cc:     linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, hugo@...ovil.com,
        linux-gpio@...r.kernel.org,
        Hugo Villeneuve <hvilleneuve@...onoff.com>
Subject: [PATCH v4 6/9] dt-bindings: sc16is7xx: Add property to change GPIO function

From: Hugo Villeneuve <hvilleneuve@...onoff.com>

Some variants in this series of UART controllers have GPIO pins that
are shared between GPIO and modem control lines.

The pin mux mode (GPIO or modem control lines) can be set for each
ports (channels) supported by the variant.

This adds a property to the device tree to set the GPIO pin mux to
modem control lines on selected ports if needed.

Signed-off-by: Hugo Villeneuve <hvilleneuve@...onoff.com>
---
 .../bindings/serial/nxp,sc16is7xx.txt         | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)

diff --git a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
index 0fa8e3e43bf8..74dfbbf7b2cb 100644
--- a/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
+++ b/Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
@@ -23,6 +23,9 @@ Optional properties:
     1 = active low.
 - irda-mode-ports: An array that lists the indices of the port that
 		   should operate in IrDA mode.
+- nxp,modem-control-line-ports: An array that lists the indices of the port that
+				should have shared GPIO lines configured as
+				modem control lines.
 
 Example:
         sc16is750: sc16is750@51 {
@@ -35,6 +38,26 @@ Example:
                 #gpio-cells = <2>;
         };
 
+	sc16is752: sc16is752@54 {
+		compatible = "nxp,sc16is752";
+		reg = <0x54>;
+		clocks = <&clk20m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+		nxp,modem-control-line-ports = <1>; /* Port 1 as modem control lines */
+		gpio-controller; /* Port 0 as GPIOs */
+		#gpio-cells = <2>;
+	};
+
+	sc16is752: sc16is752@54 {
+		compatible = "nxp,sc16is752";
+		reg = <0x54>;
+		clocks = <&clk20m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+		nxp,modem-control-line-ports = <0 1>; /* Ports 0 and 1 as modem control lines */
+	};
+
 * spi as bus
 
 Required properties:
@@ -59,6 +82,9 @@ Optional properties:
     1 = active low.
 - irda-mode-ports: An array that lists the indices of the port that
 		   should operate in IrDA mode.
+- nxp,modem-control-line-ports: An array that lists the indices of the port that
+				should have shared GPIO lines configured as
+				modem control lines.
 
 Example:
 	sc16is750: sc16is750@0 {
@@ -70,3 +96,23 @@ Example:
 		gpio-controller;
 		#gpio-cells = <2>;
 	};
+
+	sc16is752: sc16is752@0 {
+		compatible = "nxp,sc16is752";
+		reg = <0>;
+		clocks = <&clk20m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+		nxp,modem-control-line-ports = <1>; /* Port 1 as modem control lines */
+		gpio-controller; /* Port 0 as GPIOs */
+		#gpio-cells = <2>;
+	};
+
+	sc16is752: sc16is752@0 {
+		compatible = "nxp,sc16is752";
+		reg = <0>;
+		clocks = <&clk20m>;
+		interrupt-parent = <&gpio3>;
+		interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
+		nxp,modem-control-line-ports = <0 1>; /* Ports 0 and 1 as modem control lines */
+	};
-- 
2.30.2