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From 23074d03200bc35acdb2ebd8a127fb6b832307fc Mon Sep 17 00:00:00 2001
From: Erdem MEYDANLI <erdem.meydanli@punica.com.tr>
Date: Thu, 30 Jun 2016 21:05:08 +0300
Subject: [PATCH] dts: Add overlay for NXP SC16IS752 Dual UART with SPI
Interface
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 10 ++++
.../boot/dts/overlays/sc16is752-spi1-overlay.dts | 61 ++++++++++++++++++++++
3 files changed, 72 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/sc16is752-spi1-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -71,6 +71,7 @@ dtbo-$(RPI_DT_OVERLAYS) += rpi-ft5406.dt
dtbo-$(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
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -888,6 +888,16 @@ Load: dtoverlay=rra-digidac1-wm8741-au
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
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/sc16is752-spi1-overlay.dts
@@ -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";
+ };
+};
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