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From b2998ffa15aabea3292159ca20973f45ed9cb4b0 Mon Sep 17 00:00:00 2001
From: bjorn <beikeland@gmail.com>
Date: Thu, 7 May 2020 05:11:43 +0200
Subject: [PATCH] overlays: Add spi0 overlay to support sc16is752
Signed-off-by: Bjorn <beikeland@gmail.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 8 ++++
.../dts/overlays/sc16is752-spi0-overlay.dts | 44 +++++++++++++++++++
3 files changed, 53 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/sc16is752-spi0-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -143,6 +143,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
rra-digidac1-wm8741-audio.dtbo \
sc16is750-i2c.dtbo \
sc16is752-i2c.dtbo \
+ sc16is752-spi0.dtbo \
sc16is752-spi1.dtbo \
sdhost.dtbo \
sdio.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -2144,6 +2144,14 @@ Params: int_pin GPIO use
xtal On-board crystal frequency (default 14745600)
+Name: sc16is752-spi0
+Info: Overlay for the NXP SC16IS752 Dual UART with SPI Interface
+ Enables the chip on SPI0.
+Load: dtoverlay=sc16is752-spi0,<param>=<val>
+Params: int_pin GPIO used for IRQ (default 24)
+ xtal On-board crystal frequency (default 14745600)
+
+
Name: sc16is752-spi1
Info: Overlay for the NXP SC16IS752 Dual UART with SPI Interface
Enables the chip on SPI1.
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/sc16is752-spi0-overlay.dts
@@ -0,0 +1,44 @@
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target = <&spi0>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+ 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@1 {
+ target = <&spidev0>;
+ __overlay__ {
+ status = "disabled";
+ };
+ };
+
+ __overrides__ {
+ int_pin = <&sc16is752>,"interrupts:0";
+ xtal = <&sc16is752_clk>, "clock-frequency:0";
+ };
+};
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