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87 lines
3.1 KiB
Diff
87 lines
3.1 KiB
Diff
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From 16188a175bccc8fc6809b2751ba853defdff9197 Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 15 Dec 2022 15:57:18 +0000
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Subject: [PATCH] dtoverlays: Add overlay cm-swap-i2c0 to swap buses on
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i2c0mux
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The legacy camera stack wiring instructions connect the cameras
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to the opposite sets of GPIOs compared to the arrangement
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more normally used with libcamera on all other platforms.
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Add an overlay to allow easy swapping of the assignments so
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that the legacy wiring can be used with libcamera.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.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 | 16 +++++++++++
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.../dts/overlays/cm-swap-i2c0-overlay.dts | 27 +++++++++++++++++++
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3 files changed, 44 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/cm-swap-i2c0-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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@@ -39,6 +39,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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cap1106.dtbo \
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chipdip-dac.dtbo \
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cirrus-wm5102.dtbo \
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+ cm-swap-i2c0.dtbo \
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cma.dtbo \
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crystalfontz-cfa050_pi_m.dtbo \
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cutiepi-panel.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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@@ -787,6 +787,22 @@ Load: dtoverlay=cirrus-wm5102
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Params: <None>
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+Name: cm-swap-i2c0
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+Info: Largely for Compute Modules 1&3 where the original instructions for
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+ adding a camera used GPIOs 0&1 for CAM1 and 28&29 for CAM0, whilst all
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+ other platforms use 28&29 (or 44&45) for CAM1.
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+ The default assignment through using this overlay is for
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+ i2c0 to use 28&29, and i2c10 (aka i2c_csi_dsi) to use 28&29, but the
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+ overrides allow this to be changed.
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+Load: dtoverlay=cm-swap-i2c0,<param>=<val>
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+Params: i2c0-gpio0 Use GPIOs 0&1 for i2c0
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+ i2c0-gpio28 Use GPIOs 28&29 for i2c0 (default)
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+ i2c0-gpio44 Use GPIOs 44&45 for i2c0
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+ i2c10-gpio0 Use GPIOs 0&1 for i2c0 (default)
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+ i2c10-gpio28 Use GPIOs 28&29 for i2c0
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+ i2c10-gpio44 Use GPIOs 44&45 for i2c0
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+
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+
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Name: cma
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Info: Set custom CMA sizes, only use if you know what you are doing, might
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clash with other overlays like vc4-fkms-v3d and vc4-kms-v3d.
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/cm-swap-i2c0-overlay.dts
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@@ -0,0 +1,27 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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+// Definitions for IMX708 camera module on VC I2C bus
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+/dts-v1/;
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+/plugin/;
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+
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+#include <dt-bindings/gpio/gpio.h>
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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 = <&i2c0mux>;
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+ i2c0mux_frag: __overlay__ {
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+ pinctrl-0 = <&i2c0_gpio28>;
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+ pinctrl-1 = <&i2c0_gpio0>;
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+ };
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+ };
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+
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+ __overrides__ {
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+ i2c0-gpio0 = <&i2c0mux_frag>, "pinctrl-0:0=",<&i2c0_gpio0>;
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+ i2c0-gpio28 = <&i2c0mux_frag>, "pinctrl-0:0=",<&i2c0_gpio28>;
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+ i2c0-gpio44 = <&i2c0mux_frag>, "pinctrl-0:0=",<&i2c0_gpio44>;
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+ i2c10-gpio0 = <&i2c0mux_frag>, "pinctrl-1:0=",<&i2c0_gpio0>;
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+ i2c10-gpio28 = <&i2c0mux_frag>, "pinctrl-1:0=",<&i2c0_gpio28>;
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+ i2c10-gpio44 = <&i2c0mux_frag>, "pinctrl-1:0=",<&i2c0_gpio44>;
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+ };
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+};
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