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107 lines
3.0 KiB
107 lines
3.0 KiB
8 years ago
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From 2770e16422c3d3df76bb510a309877b507d4553f Mon Sep 17 00:00:00 2001
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8 years ago
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From: Erdem MEYDANLI <erdem.meydanli@punica.com.tr>
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Date: Thu, 30 Jun 2016 21:05:08 +0300
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8 years ago
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Subject: [PATCH] dts: Add overlay for NXP SC16IS752 Dual UART with SPI
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8 years ago
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Interface
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---
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arch/arm/boot/dts/overlays/Makefile | 1 +
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arch/arm/boot/dts/overlays/README | 10 ++++
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.../boot/dts/overlays/sc16is752-spi1-overlay.dts | 61 ++++++++++++++++++++++
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3 files changed, 72 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/sc16is752-spi1-overlay.dts
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--- a/arch/arm/boot/dts/overlays/Makefile
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+++ b/arch/arm/boot/dts/overlays/Makefile
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@@ -71,6 +71,7 @@ dtbo-$(RPI_DT_OVERLAYS) += rpi-ft5406.dt
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dtbo-$(RPI_DT_OVERLAYS) += rpi-proto.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += rpi-sense.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += rra-digidac1-wm8741-audio.dtbo
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+dtbo-$(RPI_DT_OVERLAYS) += sc16is752-spi1.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += sdhost.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += sdio.dtbo
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dtbo-$(RPI_DT_OVERLAYS) += sdio-1bit.dtbo
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--- a/arch/arm/boot/dts/overlays/README
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+++ b/arch/arm/boot/dts/overlays/README
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@@ -888,6 +888,16 @@ Load: dtoverlay=rra-digidac1-wm8741-au
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Params: <None>
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+Name: sc16is752-spi1
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+Info: Overlay for the NXP SC16IS752 Dual UART with SPI Interface
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+ Enables the chip on SPI1.
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+ N.B.: spi1 is only accessible on devices with a 40pin header, eg:
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+ A+, B+, Zero and PI2 B; as well as the Compute Module.
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+
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+Load: dtoverlay=sc16is752-spi1,<param>=<val>
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+Params: int_pin GPIO used for IRQ (default 24)
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+
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+
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Name: sdhost
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Info: Selects the bcm2835-sdhost SD/MMC driver, optionally with overclock.
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N.B. This overlay is designed for situations where the mmc driver is
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/sc16is752-spi1-overlay.dts
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@@ -0,0 +1,61 @@
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+/dts-v1/;
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+/plugin/;
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+
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+/ {
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+ compatible = "brcm,bcm2835", "brcm,bcm2708", "brcm,bcm2709";
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+
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+ fragment@0 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ spi1_pins: spi1_pins {
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+ brcm,pins = <19 20 21>;
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+ brcm,function = <3>; /* alt4 */
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+ };
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+
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+ spi1_cs_pins: spi1_cs_pins {
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+ brcm,pins = <18>;
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+ brcm,function = <1>; /* output */
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+ };
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+ };
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+ };
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+
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+ fragment@1 {
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+ target = <&spi1>;
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+ frag1: __overlay__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&spi1_pins &spi1_cs_pins>;
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+ cs-gpios = <&gpio 18 1>;
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+ status = "okay";
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+
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+ sc16is752: sc16is752@0 {
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+ compatible = "nxp,sc16is752";
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+ reg = <0>; /* CE0 */
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+ clocks = <&sc16is752_clk>;
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+ interrupt-parent = <&gpio>;
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+ interrupts = <24 2>; /* IRQ_TYPE_EDGE_FALLING */
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+ #gpio-controller;
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+ #gpio-cells = <2>;
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+ spi-max-frequency = <4000000>;
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+
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+ sc16is752_clk: sc16is752_clk {
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+ compatible = "fixed-clock";
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+ #clock-cells = <0>;
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+ clock-frequency = <14745600>;
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+ };
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+ };
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+ };
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+ };
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+
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+ fragment@2 {
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+ target = <&aux>;
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+ __overlay__ {
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+ status = "okay";
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+ };
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+ };
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+
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+ __overrides__ {
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+ int_pin = <&sc16is752>,"interrupts:0";
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+ };
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+};
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