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From 7f747c53fc4afa9a25eeb3ca290b4fed4690ca3f Mon Sep 17 00:00:00 2001
From: "Sunip K. Mukherjee" <sunipkmukherjee@gmail.com>
Date: Sun, 4 Jul 2021 16:03:07 -0400
Subject: [PATCH] overlays: Add overlay for Si446x Transceiver SPI
See: https://github.com/raspberrypi/linux/pull/4430
Signed-off-by: Sunip K. Mukherjee <sunipkmukherjee@gmail.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 10 ++++
.../boot/dts/overlays/si446x-spi0-overlay.dts | 53 +++++++++++++++++++
3 files changed, 64 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/si446x-spi0-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -176,6 +176,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
seeed-can-fd-hat-v1.dtbo \
seeed-can-fd-hat-v2.dtbo \
sh1106-spi.dtbo \
+ si446x-spi0.dtbo \
smi.dtbo \
smi-dev.dtbo \
smi-nand.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -2733,6 +2733,16 @@ Params: speed SPI bus
height Display height (32 or 64; default 64)
+Name: si446x-spi0
+Info: Overlay for Si446x UHF Transceiver via SPI using si446x driver.
+ The driver is currently out-of-tree at
+ https://github.com/sunipkmukherjee/silabs.git
+Load: dtoverlay=si446x-spi0,<param>=<val>
+Params: speed SPI bus speed (default 4000000)
+ int_pin GPIO pin for interrupts (default 17)
+ reset_pin GPIO pin for RESET (default 27)
+
+
Name: smi
Info: Enables the Secondary Memory Interface peripheral. Uses GPIOs 2-25!
Load: dtoverlay=smi
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/si446x-spi0-overlay.dts
@@ -0,0 +1,53 @@
+// Overlay for the SiLabs Si446X Controller - SPI0
+// Default Interrupt Pin: 17
+// Default SDN Pin: 27
+/dts-v1/;
+/plugin/;
+
+ / {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target = <&spi0>;
+ __overlay__ {
+ // needed to avoid dtc warning
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ status = "okay";
+
+ uhf0: si446x@0{
+ compatible = "silabs,si446x";
+ reg = <0>; // CE0
+ pinctrl-names = "default";
+ pinctrl-0 = <&uhf0_pins>;
+ interrupt-parent = <&gpio>;
+ interrupts = <17 0x2>; // falling edge
+ spi-max-frequency = <4000000>;
+ sdn_pin = <27>;
+ irq_pin = <17>;
+ status = "okay";
+ };
+ };
+ };
+
+ fragment@1 {
+ target = <&gpio>;
+ __overlay__ {
+ uhf0_pins: uhf0_pins {
+ brcm,pins = <17 27>;
+ brcm,function = <0 1>; // in, out
+ brcm,pull = <2 0>; // high, none
+ };
+ };
+ };
+
+ __overrides__ {
+ int_pin = <&uhf0>, "interrupts:0",
+ <&uhf0>, "irq_pin:0",
+ <&uhf0_pins>, "brcm,pins:0";
+ reset_pin = <&uhf0>, "sdn_pin:0",
+ <&uhf0_pins>, "brcm,pins:4";
+ speed = <&uhf0>, "spi-max-frequency:0";
+ };
+};
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