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Diffstat (limited to 'target/linux/brcm2708/patches-4.1/0154-BCM270X_DT-Add-pwm-and-pwm-2chan-overlays.patch')
-rw-r--r--target/linux/brcm2708/patches-4.1/0154-BCM270X_DT-Add-pwm-and-pwm-2chan-overlays.patch250
1 files changed, 250 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.1/0154-BCM270X_DT-Add-pwm-and-pwm-2chan-overlays.patch b/target/linux/brcm2708/patches-4.1/0154-BCM270X_DT-Add-pwm-and-pwm-2chan-overlays.patch
new file mode 100644
index 0000000..80bb708
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.1/0154-BCM270X_DT-Add-pwm-and-pwm-2chan-overlays.patch
@@ -0,0 +1,250 @@
+From 9ace261c44e2a16d13305b34b06a56c1a4838dc5 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Mon, 17 Aug 2015 10:49:44 +0100
+Subject: [PATCH 154/171] BCM270X_DT: Add pwm and pwm-2chan overlays
+
+From the README entries:
+ Legal pin,function combinations for each channel:
+ PWM0: 12,4(Alt0) 18,2(Alt5) 40,4(Alt0) 52,5(Alt1)
+ PWM1: 13,4(Alt0) 19,2(Alt5) 41,4(Alt0) 45,4(Alt0) 53,5(Alt1)
+ N.B.:
+ 1) Pin 18 is the only one available on all platforms, and
+ it is the one used by the I2S audio interface.
+ Pins 12 and 13 might be better choices on an A+, B+ or Pi2.
+ 2) The onboard analogue audio output uses both PWM channels.
+ 3) So be careful mixing audio and PWM.
+ 4) Currently the clock must have been enabled and configured
+ by other means.
+
+See: https://github.com/raspberrypi/linux/issues/756
+---
+ arch/arm/boot/dts/bcm2708_common.dtsi | 16 +++++++++
+ arch/arm/boot/dts/overlays/Makefile | 2 ++
+ arch/arm/boot/dts/overlays/README | 41 +++++++++++++++++++++
+ arch/arm/boot/dts/overlays/pwm-2chan-overlay.dts | 46 ++++++++++++++++++++++++
+ arch/arm/boot/dts/overlays/pwm-overlay.dts | 42 ++++++++++++++++++++++
+ arch/arm/configs/bcm2709_defconfig | 1 +
+ arch/arm/configs/bcmrpi_defconfig | 1 +
+ drivers/pwm/Kconfig | 2 +-
+ 8 files changed, 150 insertions(+), 1 deletion(-)
+ create mode 100644 arch/arm/boot/dts/overlays/pwm-2chan-overlay.dts
+ create mode 100644 arch/arm/boot/dts/overlays/pwm-overlay.dts
+
+--- a/arch/arm/boot/dts/bcm2708_common.dtsi
++++ b/arch/arm/boot/dts/bcm2708_common.dtsi
+@@ -154,6 +154,14 @@
+ status = "disabled";
+ };
+
++ pwm: pwm@7e20c000 {
++ compatible = "brcm,bcm2835-pwm";
++ reg = <0x7e20c000 0x28>;
++ clocks = <&clk_pwm>;
++ #pwm-cells = <2>;
++ status = "disabled";
++ };
++
+ uart1: uart@7e215040 {
+ compatible = "brcm,bcm2835-aux-uart", "ns16550";
+ reg = <0x7e215040 0x40>;
+@@ -279,6 +287,14 @@
+ clock-output-names = "apb_pclk";
+ clock-frequency = <126000000>;
+ };
++
++ clk_pwm: clock@5 {
++ compatible = "fixed-clock";
++ reg = <3>;
++ #clock-cells = <0>;
++ clock-output-names = "pwm";
++ clock-frequency = <100000000>;
++ };
+ };
+
+ __overrides__ {
+--- a/arch/arm/boot/dts/overlays/Makefile
++++ b/arch/arm/boot/dts/overlays/Makefile
+@@ -35,6 +35,8 @@ dtb-$(RPI_DT_OVERLAYS) += mz61581-overla
+ dtb-$(RPI_DT_OVERLAYS) += piscreen-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += pitft28-resistive-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += pps-gpio-overlay.dtb
++dtb-$(RPI_DT_OVERLAYS) += pwm-overlay.dtb
++dtb-$(RPI_DT_OVERLAYS) += pwm-2chan-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += rpi-dac-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += rpi-display-overlay.dtb
+ dtb-$(RPI_DT_OVERLAYS) += rpi-ft5406-overlay.dtb
+--- a/arch/arm/boot/dts/overlays/README
++++ b/arch/arm/boot/dts/overlays/README
+@@ -410,6 +410,47 @@ Load: dtoverlay=pps-gpio,<param>=<val>
+ Params: gpiopin Input GPIO (default "18")
+
+
++Name: pwm
++Info: Configures a single PWM channel
++ Legal pin,function combinations for each channel:
++ PWM0: 12,4(Alt0) 18,2(Alt5) 40,4(Alt0) 52,5(Alt1)
++ PWM1: 13,4(Alt0) 19,2(Alt5) 41,4(Alt0) 45,4(Alt0) 53,5(Alt1)
++ N.B.:
++ 1) Pin 18 is the only one available on all platforms, and
++ it is the one used by the I2S audio interface.
++ Pins 12 and 13 might be better choices on an A+, B+ or Pi2.
++ 2) The onboard analogue audio output uses both PWM channels.
++ 3) So be careful mixing audio and PWM.
++ 4) Currently the clock must have been enabled and configured
++ by other means.
++Load: dtoverlay=pwm-2chan,<param>=<val>
++Load: dtoverlay=pwm,<param>=<val>
++Params: pin Output pin (default 18) - see table
++ func Pin function (default 2 = Alt5) - see above
++ clock PWM clock frequency (informational)
++
++
++Name: pwm-2chan
++Info: Configures both PWM channels
++ Legal pin,function combinations for each channel:
++ PWM0: 12,4(Alt0) 18,2(Alt5) 40,4(Alt0) 52,5(Alt1)
++ PWM1: 13,4(Alt0) 19,2(Alt5) 41,4(Alt0) 45,4(Alt0) 53,5(Alt1)
++ N.B.:
++ 1) Pin 18 is the only one available on all platforms, and
++ it is the one used by the I2S audio interface.
++ Pins 12 and 13 might be better choices on an A+, B+ or Pi2.
++ 2) The onboard analogue audio output uses both PWM channels.
++ 3) So be careful mixing audio and PWM.
++ 4) Currently the clock must have been enabled and configured
++ by other means.
++Load: dtoverlay=pwm-2chan,<param>=<val>
++Params: pin Output pin (default 18) - see table
++ pin2 Output pin for other channel (default 19)
++ func Pin function (default 2 = Alt5) - see above
++ func2 Function for pin2 (default 2 = Alt5)
++ clock PWM clock frequency (informational)
++
++
+ Name: rpi-dac
+ Info: Configures the RPi DAC audio card
+ Load: dtoverlay=rpi-dac
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/pwm-2chan-overlay.dts
+@@ -0,0 +1,46 @@
++/dts-v1/;
++/plugin/;
++
++/*
++This is the 2-channel overlay - only use it if you need both channels.
++
++Legal pin,function combinations for each channel:
++ PWM0: 12,4(Alt0) 18,2(Alt5) 40,4(Alt0) 52,5(Alt1)
++ PWM1: 13,4(Alt0) 19,2(Alt5) 41,4(Alt0) 45,4(Alt0) 53,5(Alt1)
++
++N.B.:
++ 1) Pin 18 is the only one available on all platforms, and
++ it is the one used by the I2S audio interface.
++ Pins 12 and 13 might be better choices on an A+, B+ or Pi2.
++ 2) The onboard analogue audio output uses both PWM channels.
++ 3) So be careful mixing audio and PWM.
++*/
++
++/ {
++ fragment@0 {
++ target = <&gpio>;
++ __overlay__ {
++ pwm_pins: pwm_pins {
++ brcm,pins = <18 19>;
++ brcm,function = <2 2>; /* Alt5 */
++ };
++ };
++ };
++
++ fragment@1 {
++ target = <&pwm>;
++ __overlay__ {
++ pinctrl-names = "default";
++ pinctrl-0 = <&pwm_pins>;
++ status = "okay";
++ };
++ };
++
++ __overrides__ {
++ pin = <&pwm_pins>,"brcm,pins:0";
++ pin2 = <&pwm_pins>,"brcm,pins:4";
++ func = <&pwm_pins>,"brcm,function:0";
++ func2 = <&pwm_pins>,"brcm,function:4";
++ clock = <&clk_pwm>,"clock-frequency:0";
++ };
++};
+--- /dev/null
++++ b/arch/arm/boot/dts/overlays/pwm-overlay.dts
+@@ -0,0 +1,42 @@
++/dts-v1/;
++/plugin/;
++
++/*
++Legal pin,function combinations for each channel:
++ PWM0: 12,4(Alt0) 18,2(Alt5) 40,4(Alt0) 52,5(Alt1)
++ PWM1: 13,4(Alt0) 19,2(Alt5) 41,4(Alt0) 45,4(Alt0) 53,5(Alt1)
++
++N.B.:
++ 1) Pin 18 is the only one available on all platforms, and
++ it is the one used by the I2S audio interface.
++ Pins 12 and 13 might be better choices on an A+, B+ or Pi2.
++ 2) The onboard analogue audio output uses both PWM channels.
++ 3) So be careful mixing audio and PWM.
++*/
++
++/ {
++ fragment@0 {
++ target = <&gpio>;
++ __overlay__ {
++ pwm_pins: pwm_pins {
++ brcm,pins = <18>;
++ brcm,function = <2>; /* Alt5 */
++ };
++ };
++ };
++
++ fragment@1 {
++ target = <&pwm>;
++ __overlay__ {
++ pinctrl-names = "default";
++ pinctrl-0 = <&pwm_pins>;
++ status = "okay";
++ };
++ };
++
++ __overrides__ {
++ pin = <&pwm_pins>,"brcm,pins:0";
++ func = <&pwm_pins>,"brcm,function:0";
++ clock = <&clk_pwm>,"clock-frequency:0";
++ };
++};
+--- a/arch/arm/configs/bcm2709_defconfig
++++ b/arch/arm/configs/bcm2709_defconfig
+@@ -1089,6 +1089,7 @@ CONFIG_IIO_BUFFER=y
+ CONFIG_IIO_BUFFER_CB=y
+ CONFIG_IIO_KFIFO_BUF=m
+ CONFIG_DHT11=m
++CONFIG_PWM_BCM2835=m
+ CONFIG_RASPBERRYPI_FIRMWARE=y
+ CONFIG_EXT4_FS=y
+ CONFIG_EXT4_FS_POSIX_ACL=y
+--- a/arch/arm/configs/bcmrpi_defconfig
++++ b/arch/arm/configs/bcmrpi_defconfig
+@@ -1082,6 +1082,7 @@ CONFIG_IIO_BUFFER=y
+ CONFIG_IIO_BUFFER_CB=y
+ CONFIG_IIO_KFIFO_BUF=m
+ CONFIG_DHT11=m
++CONFIG_PWM_BCM2835=m
+ CONFIG_RASPBERRYPI_FIRMWARE=y
+ CONFIG_EXT4_FS=y
+ CONFIG_EXT4_FS_POSIX_ACL=y
+--- a/drivers/pwm/Kconfig
++++ b/drivers/pwm/Kconfig
+@@ -85,7 +85,7 @@ config PWM_BCM_KONA
+
+ config PWM_BCM2835
+ tristate "BCM2835 PWM support"
+- depends on ARCH_BCM2835
++ depends on ARCH_BCM2835 || ARCH_BCM2708 || ARCH_BCM2709
+ help
+ PWM framework driver for BCM2835 controller (Raspberry Pi)
+
generated by cgit v1.1 at 2024-12-14 20:29:52 +0000