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bcm53xx: enable PWM for bcm53xx

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The Meraki MR32 (BCM53016A1) uses the pwm to drive the
tricolor LED. The driver has been available in upstream
for a long time. Only the Device-Tree definition was
missing, but it has been queued recently.

Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
This commit is contained in:
Christian Lamparter 2020-08-29 22:53:18 +02:00
parent f6fbc39706
commit c6d9a2ac59
3 changed files with 52 additions and 1 deletions
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2
target/linux/bcm53xx/Makefile
View File

@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
ARCH:=arm
BOARD:=bcm53xx
BOARDNAME:=Broadcom BCM47xx/53xx (ARM)
FEATURES:=squashfs nand usb pci pcie gpio
FEATURES:=squashfs nand usb pci pcie gpio pwm
CPU_TYPE:=cortex-a9
SUBTARGETS:=generic

3
target/linux/bcm53xx/config-5.4
View File

@ -308,6 +308,9 @@ CONFIG_PINCTRL=y
# CONFIG_PINCTRL_IPROC_GPIO is not set
CONFIG_PINCTRL_NS=y
# CONFIG_PINCTRL_NS2_MUX is not set
CONFIG_PWM=y
CONFIG_PWM_BCM_IPROC=y
CONFIG_PWM_SYSFS=y
CONFIG_RATIONAL=y
CONFIG_RCU_NEED_SEGCBLIST=y
CONFIG_RCU_STALL_COMMON=y

48
target/linux/bcm53xx/patches-5.4/033-v5.10-ARM-dts-BCM5301X-Specify-PWM-in-the-DT.patch Normal file
View File

@ -0,0 +1,48 @@
From 0ea4b29d149586667d96767f1fc8e57ee942c1b0 Mon Sep 17 00:00:00 2001
From: Christian Lamparter <chunkeey@gmail.com>
Date: Sat, 22 Aug 2020 18:19:19 +0200
Subject: [PATCH] ARM: dts: BCM5301X: Specify PWM in the DT
The BCM53016 in the Meraki MR32 uses the on-chip PWM
controller to drive a tri-color RGB LED. Since I plan
to use the PWM, I made a label for the pwm's pinmux
node. This way, it can be easily referenced.... And
Also included a label for the i2c since I'm going to
need it in the future too.
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Acked-by: Scott Branden <scott.branden@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
--- a/arch/arm/boot/dts/bcm5301x.dtsi
+++ b/arch/arm/boot/dts/bcm5301x.dtsi
@@ -350,6 +350,14 @@
};
};
+ pwm: pwm@18002000 {
+ compatible = "brcm,iproc-pwm";
+ reg = <0x18002000 0x28>;
+ clocks = <&osc>;
+ #pwm-cells = <3>;
+ status = "disabled";
+ };
+
mdio: mdio@18003000 {
compatible = "brcm,iproc-mdio";
reg = <0x18003000 0x8>;
@@ -417,12 +425,12 @@
function = "spi";
};
- i2c {
+ pinmux_i2c: i2c {
groups = "i2c_grp";
function = "i2c";
};
- pwm {
+ pinmux_pwm: pwm {
groups = "pwm0_grp", "pwm1_grp",
"pwm2_grp", "pwm3_grp";
function = "pwm";