3a5584e0df
Adds latest 6.6 patches from the Raspberry Pi repository.
These patches were generated from:
https://github.com/raspberrypi/linux/commits/rpi-6.6.y/
With the following command:
git format-patch -N v6.6.67..HEAD
(HEAD -> 811ff707533bcd67cdcd368bbd46223082009b12)
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry picked from commit 692205305d)
100 lines
2.6 KiB
Diff
100 lines
2.6 KiB
Diff
From ba7e2e3d03a432acbc338c6c03e46dcd97cfa1b3 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Thu, 7 Nov 2024 11:41:33 +0000
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Subject: [PATCH] overlays: Add pwm-pio overlay
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Add an overlay to enable a single-channel PIO-assisted PWM interface on any
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header pin.
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Signed-off-by: Phil Elwell <phil@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 | 8 ++++
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arch/arm/boot/dts/overlays/overlay_map.dts | 4 ++
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.../arm/boot/dts/overlays/pwm-pio-overlay.dts | 39 +++++++++++++++++++
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4 files changed, 52 insertions(+)
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create mode 100644 arch/arm/boot/dts/overlays/pwm-pio-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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@@ -219,6 +219,7 @@ dtbo-$(CONFIG_ARCH_BCM2835) += \
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pwm-2chan.dtbo \
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pwm-gpio.dtbo \
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pwm-ir-tx.dtbo \
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+ pwm-pio.dtbo \
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pwm1.dtbo \
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qca7000.dtbo \
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qca7000-uart0.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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@@ -3926,6 +3926,14 @@ Params: gpio_pin Output G
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func Pin function (default 2 = Alt5)
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+Name: pwm-pio
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+Info: Configures a GPIO pin as PIO-assisted PWM output. Unlike hardware PWM,
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+ this can be used on any RP1 GPIO in bank 0 (0-27). Up to 4 are
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+ supported, assuming nothing else is using PIO. Pi 5 only.
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+Load: dtoverlay=pwm-pio,<param>=<val>
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+Params: gpio Output GPIO (0-27, default 4)
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+
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+
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Name: pwm1
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Info: Configures one or two PWM channel on PWM1 (BCM2711 only)
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N.B.:
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--- a/arch/arm/boot/dts/overlays/overlay_map.dts
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+++ b/arch/arm/boot/dts/overlays/overlay_map.dts
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@@ -240,6 +240,10 @@
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bcm2712;
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};
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+ pwm-pio {
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+ bcm2712;
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+ };
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+
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pwm1 {
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bcm2711;
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};
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--- /dev/null
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+++ b/arch/arm/boot/dts/overlays/pwm-pio-overlay.dts
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@@ -0,0 +1,39 @@
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+// SPDX-License-Identifier: GPL-2.0
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+// Device tree overlay for RP1 PIO PWM.
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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,bcm2712";
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+
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+ fragment@0 {
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+ target = <&gpio>;
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+ __overlay__ {
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+ pwm_pio_pins: pwm_pio_pins@4 {
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+ brcm,pins = <4>; /* gpio 4 */
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+ function = "pio";
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+ bias-disable;
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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-path = "/";
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+ __overlay__ {
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+ pwm_pio: pwm_pio@4 {
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+ compatible = "raspberrypi,pwm-pio-rp1";
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+ pinctrl-names = "default";
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+ pinctrl-0 = <&pwm_pio_pins>;
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+ gpios = <&gpio 4 0>;
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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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+ gpio = <&pwm_pio>,"gpios:4",
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+ <&pwm_pio_pins>,"brcm,pins:0",
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+ /* modify reg values to allow multiple instantiation */
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+ <&pwm_pio>,"reg:0",
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+ <&pwm_pio_pins>,"reg:0";
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+ };
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+};
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