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From e0db80960019c296c47690dea9052dc4960f4f99 Mon Sep 17 00:00:00 2001
From: Clarke X <1014930533@qq.com>
Date: Sat, 8 Apr 2023 11:29:16 +0800
Subject: [PATCH] overlays: Add pcf857x support
Add pcf857x overlay with related documents.
Signed-off-by: Clarke X <1014930533@qq.com>
---
arch/arm/boot/dts/overlays/Makefile | 1 +
arch/arm/boot/dts/overlays/README | 11 +++++++
.../arm/boot/dts/overlays/pcf857x-overlay.dts | 32 +++++++++++++++++++
3 files changed, 44 insertions(+)
create mode 100644 arch/arm/boot/dts/overlays/pcf857x-overlay.dts
--- a/arch/arm/boot/dts/overlays/Makefile
+++ b/arch/arm/boot/dts/overlays/Makefile
@@ -167,6 +167,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
ov9281.dtbo \
papirus.dtbo \
pca953x.dtbo \
+ pcf857x.dtbo \
pcie-32bit-dma.dtbo \
pibell.dtbo \
pifacedigital.dtbo \
--- a/arch/arm/boot/dts/overlays/README
+++ b/arch/arm/boot/dts/overlays/README
@@ -3065,6 +3065,17 @@ Params: addr I2C addr
xra1202 Select the Exar XRA1202 (8 bit)
+Name: pcf857x
+Info: NXP PCF857x family of I2C GPIO expanders.
+Load: dtoverlay=pcf857x,<param>=<val>
+Params: addr I2C address of expander. Default
+ depends on model selected.
+ pcf8574 Select the NXP PCF8574 (8 bit)
+ pcf8574a Select the NXP PCF8574A (8 bit)
+ pcf8575 Select the NXP PCF8575 (16 bit)
+ pca8574 Select the NXP PCA8574 (8 bit)
+
+
Name: pcie-32bit-dma
Info: Force PCIe config to support 32bit DMA addresses at the expense of
having to bounce buffers.
--- /dev/null
+++ b/arch/arm/boot/dts/overlays/pcf857x-overlay.dts
@@ -0,0 +1,32 @@
+// Definitions for PCF857X GPIO Extender from NXP
+
+/dts-v1/;
+/plugin/;
+
+/ {
+ compatible = "brcm,bcm2835";
+
+ fragment@0 {
+ target = <&i2c_arm>;
+ __overlay__ {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ pcf857x: pcf857x@0 {
+ compatible = "";
+ reg = <0x00>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ status = "okay";
+ };
+ };
+ };
+
+ __overrides__ {
+ pcf8574 = <&pcf857x>,"compatible=nxp,pcf8574", <&pcf857x>,"reg:0=0x20";
+ pcf8574a = <&pcf857x>,"compatible=nxp,pcf8574a", <&pcf857x>,"reg:0=0x38";
+ pcf8575 = <&pcf857x>,"compatible=nxp,pcf8575", <&pcf857x>,"reg:0=0x20";
+ pca8574 = <&pcf857x>,"compatible=nxp,pca8574", <&pcf857x>,"reg:0=0x20";
+ addr = <&pcf857x>,"reg:0";
+ };
+};
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