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dts: Add overlay for NXP SC16IS752 Dual UART with SPI Interface

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This commit is contained in:
Erdem MEYDANLI
2016-06-30 21:05:08 +03:00
committed by popcornmix
parent 0bd2e50457
commit c98a31a38d
3 changed files with 72 additions and 0 deletions
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1
arch/arm/boot/dts/overlays/Makefile
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@@ -70,6 +70,7 @@ dtbo-$(RPI_DT_OVERLAYS) += rpi-ft5406.dtbo
dtbo-$(RPI_DT_OVERLAYS) += rpi-proto.dtbo
dtbo-$(RPI_DT_OVERLAYS) += rpi-sense.dtbo
dtbo-$(RPI_DT_OVERLAYS) += rra-digidac1-wm8741-audio.dtbo
dtbo-$(RPI_DT_OVERLAYS) += sc16is752-spi1.dtbo
dtbo-$(RPI_DT_OVERLAYS) += sdhost.dtbo
dtbo-$(RPI_DT_OVERLAYS) += sdio.dtbo
dtbo-$(RPI_DT_OVERLAYS) += sdio-1bit.dtbo

10
arch/arm/boot/dts/overlays/README
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@@ -862,6 +862,16 @@ Load: dtoverlay=rra-digidac1-wm8741-audio
Params: <None>
Name: sc16is752-spi1
Info: Overlay for the NXP SC16IS752 Dual UART with SPI Interface
Enables the chip on SPI1.
N.B.: spi1 is only accessible on devices with a 40pin header, eg:
A+, B+, Zero and PI2 B; as well as the Compute Module.
Load: dtoverlay=sc16is752-spi1,<param>=<val>
Params: int_pin GPIO used for IRQ (default 24)
Name: sdhost
Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock.
N.B. This overlay is designed for situations where the mmc driver is

61
arch/arm/boot/dts/overlays/sc16is752-spi1-overlay.dts Normal file
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@@ -0,0 +1,61 @@
/dts-v1/;
/plugin/;
/ {
compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
fragment@0 {
target = <&gpio>;
__overlay__ {
spi1_pins: spi1_pins {
brcm,pins = <19 20 21>;
brcm,function = <3>; /* alt4 */
};
spi1_cs_pins: spi1_cs_pins {
brcm,pins = <18>;
brcm,function = <1>; /* output */
};
};
};
fragment@1 {
target = <&spi1>;
frag1: __overlay__ {
#address-cells = <1>;
#size-cells = <0>;
pinctrl-names = "default";
pinctrl-0 = <&spi1_pins &spi1_cs_pins>;
cs-gpios = <&gpio 18 1>;
status = "okay";
sc16is752: sc16is752@0 {
compatible = "nxp,sc16is752";
reg = <0>; /* CE0 */
clocks = <&sc16is752_clk>;
interrupt-parent = <&gpio>;
interrupts = <24 2>; /* IRQ_TYPE_EDGE_FALLING */
#gpio-controller;
#gpio-cells = <2>;
spi-max-frequency = <4000000>;
sc16is752_clk: sc16is752_clk {
compatible = "fixed-clock";
#clock-cells = <0>;
clock-frequency = <14745600>;
};
};
};
};
fragment@2 {
target = <&aux>;
__overlay__ {
status = "okay";
};
};
__overrides__ {
int_pin = <&sc16is752>,"interrupts:0";
};
};