mirror of
https://github.com/Ysurac/openmptcprouter.git
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80 lines
2.5 KiB
Diff
80 lines
2.5 KiB
Diff
From 1e1641adaaf26aaf218831d1c39ff1720c59e8c9 Mon Sep 17 00:00:00 2001
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From: Clarke X <1014930533@qq.com>
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Date: Sat, 8 Apr 2023 11:29:16 +0800
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Subject: [PATCH] overlays: Add pcf857x support
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Add pcf857x overlay with related documents.
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Signed-off-by: Clarke X <1014930533@qq.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 | 11 +++++++
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.../arm/boot/dts/overlays/pcf857x-overlay.dts | 32 +++++++++++++++++++
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3 files changed, 44 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/pcf857x-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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@@ -167,6 +167,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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ov9281.dtbo \
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papirus.dtbo \
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pca953x.dtbo \
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+ pcf857x.dtbo \
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pcie-32bit-dma.dtbo \
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pibell.dtbo \
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pifacedigital.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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@@ -3065,6 +3065,17 @@ Params: addr I2C addr
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xra1202 Select the Exar XRA1202 (8 bit)
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+Name: pcf857x
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+Info: NXP PCF857x family of I2C GPIO expanders.
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+Load: dtoverlay=pcf857x,<param>=<val>
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+Params: addr I2C address of expander. Default
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+ depends on model selected.
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+ pcf8574 Select the NXP PCF8574 (8 bit)
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+ pcf8574a Select the NXP PCF8574A (8 bit)
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+ pcf8575 Select the NXP PCF8575 (16 bit)
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+ pca8574 Select the NXP PCA8574 (8 bit)
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+
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+
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Name: pcie-32bit-dma
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Info: Force PCIe config to support 32bit DMA addresses at the expense of
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having to bounce buffers.
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/pcf857x-overlay.dts
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@@ -0,0 +1,32 @@
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+// Definitions for PCF857X GPIO Extender from NXP
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+
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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 = <&i2c_arm>;
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+ __overlay__ {
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+ #address-cells = <1>;
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+ #size-cells = <0>;
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+
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+ pcf857x: pcf857x@0 {
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+ compatible = "";
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+ reg = <0x00>;
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+ gpio-controller;
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+ #gpio-cells = <2>;
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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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+ __overrides__ {
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+ pcf8574 = <&pcf857x>,"compatible=nxp,pcf8574", <&pcf857x>,"reg:0=0x20";
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+ pcf8574a = <&pcf857x>,"compatible=nxp,pcf8574a", <&pcf857x>,"reg:0=0x38";
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+ pcf8575 = <&pcf857x>,"compatible=nxp,pcf8575", <&pcf857x>,"reg:0=0x20";
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+ pca8574 = <&pcf857x>,"compatible=nxp,pca8574", <&pcf857x>,"reg:0=0x20";
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+ addr = <&pcf857x>,"reg:0";
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+ };
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+};
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