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