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dt-bindings: sc16is7xx: Add property to change GPIO function
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commit 4cf478d upstream.

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.

Cc: stable@vger.kernel.org # 6.1.x
Signed-off-by: Hugo Villeneuve <hvilleneuve@dimonoff.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Lech Perczak <lech.perczak@camlingroup.com>
Acked-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230807214556.540627-4-hugo@hugovil.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Hugo Villeneuve authored and Greg Kroah-Hartman committed Sep 6, 2023
1 parent f75a9a5 commit d53a0a7
Showing 1 changed file with 46 additions and 0 deletions.
46 changes: 46 additions & 0 deletions Documentation/devicetree/bindings/serial/nxp,sc16is7xx.txt
Original file line number Diff line number Diff line change
@@ -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@53 {
compatible = "nxp,sc16is752";
reg = <0x53>;
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@1 {
compatible = "nxp,sc16is752";
reg = <1>;
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@2 {
compatible = "nxp,sc16is752";
reg = <2>;
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 */
};

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