Hi Alexander,
i think this subject should better start with "ARM:".
Am 03.11.2015 um 23:45 schrieb Alexander Aring:
This patch adds support for RPi several Power Domains and enable support
to enable the USB Power Domain when it's not enabled before.
This patch based on Eric Anholt's patch to support Power Domains. He had
an issue about -EPROBE_DEFER inside the power domain subsystem, this
issue was solved by commit <311fa6a> ("PM / Domains: Return -EPROBE_DEFER
if we fail to init or turn-on domain").
[...]
diff --git a/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-power.txt b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-power.txt
new file mode 100644
index 0000000..c3abc24
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/bcm/raspberrypi,bcm2835-power.txt
@@ -0,0 +1,25 @@
+Raspberry Pi power domain driver
+
+Required properties:
+
+- compatible: Should be "raspberrypi,bcm2835-power".
+- firmware: Reference to the RPi firmware device node.
+- #power-domain-cells: Should be <1>, we providing multiple power domains.
+
+The valid defines for power domain are:
+
+ RPI_POWER_DOMAIN_USB
+
+Example:
+
+power: power {
+ compatible = "raspberrypi,bcm2835-power";
+ firmware = <&firmware>;
+ #power-domain-cells = <1>;
+};
+
+Example for using power domain:
+
+&usb {
+ power-domains = <&power RPI_POWER_DOMAIN_USB>;
+};
Refering to Documentation/devicetree/bindings/submitting-patches.txt
binding doc should be a separate patch.
diff --git a/arch/arm/boot/dts/bcm2835-rpi.dtsi b/arch/arm/boot/dts/bcm2835-rpi.dtsi
index ab5474e..d9b16d1 100644
--- a/arch/arm/boot/dts/bcm2835-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm2835-rpi.dtsi
@@ -1,3 +1,4 @@
+#include <dt-bindings/arm/raspberrypi-power.h>
#include "bcm2835.dtsi"
/ {
@@ -20,6 +21,12 @@
compatible = "raspberrypi,bcm2835-firmware";
mboxes = <&mailbox>;
};
+
+ power: power {
+ compatible = "raspberrypi,bcm2835-power";
+ firmware = <&firmware>;
+ #power-domain-cells = <1>;
+ };
};
};
@@ -56,3 +63,7 @@
status = "okay";
bus-width = <4>;
};
+
+&usb {
+ power-domains = <&power RPI_POWER_DOMAIN_USB>;
+};
diff --git a/arch/arm/boot/dts/bcm2835.dtsi b/arch/arm/boot/dts/bcm2835.dtsi
index 301c73f..3c899b3 100644
--- a/arch/arm/boot/dts/bcm2835.dtsi
+++ b/arch/arm/boot/dts/bcm2835.dtsi
@@ -149,7 +149,7 @@
status = "disabled";
};
- usb@7e980000 {
+ usb: usb@7e980000 {
compatible = "brcm,bcm2835-usb";
reg = <0x7e980000 0x10000>;
interrupts = <1 9>;
diff --git a/arch/arm/mach-bcm/Kconfig b/arch/arm/mach-bcm/Kconfig
index 1319c3c..244475e5 100644
--- a/arch/arm/mach-bcm/Kconfig
+++ b/arch/arm/mach-bcm/Kconfig
@@ -120,6 +120,16 @@ config ARCH_BCM2835
This enables support for the Broadcom BCM2835 SoC. This SoC is
used in the Raspberry Pi and Roku 2 devices.
+config RASPBERRY_POWER
RASPBERRYPI_POWER?
+ bool "Raspberry Pi power domain driver"
+ depends on ARCH_BCM2835
+ depends on RASPBERRYPI_FIRMWARE
+ select PM_GENERIC_DOMAINS if PM
Since PM_GENERIC_DOMAINS_OF depends on PM_GENERIC_DOMAINS this line
should be redundant.
+ select PM_GENERIC_DOMAINS_OF if PM
+ help
+ This enables support for the RPi power domains which can be enabled
+ or disabled via the RPi firmware.
+
config ARCH_BCM_63XX
bool "Broadcom BCM63xx DSL SoC" if ARCH_MULTI_V7
depends on MMU
diff --git a/arch/arm/mach-bcm/Makefile b/arch/arm/mach-bcm/Makefile
index 1780a3f..283295e 100644
--- a/arch/arm/mach-bcm/Makefile
+++ b/arch/arm/mach-bcm/Makefile
@@ -33,6 +33,7 @@ endif
# BCM2835
obj-$(CONFIG_ARCH_BCM2835) += board_bcm2835.o
+obj-$(CONFIG_RASPBERRY_POWER) += raspberrypi-power.o
# BCM5301X
obj-$(CONFIG_ARCH_BCM_5301X) += bcm_5301x.o
diff --git a/arch/arm/mach-bcm/raspberrypi-power.c b/arch/arm/mach-bcm/raspberrypi-power.c
new file mode 100644
index 0000000..531300f
--- /dev/null
+++ b/arch/arm/mach-bcm/raspberrypi-power.c
@@ -0,0 +1,180 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Authors:
+ * (C) 2015 Pengutronix, Alexander Aring <aar@xxxxxxxxxxxxxx>
+ * Eric Anholt <eric@xxxxxxxxxx>
+ */
+
+#include <linux/module.h>
+#include <linux/pm_domain.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
Please sort alphabetical.
+#include <dt-bindings/arm/raspberrypi-power.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
+#define RPI_POWER_DOMAIN(_domain, _name) \
+ [_domain] = { \
+ .domain = _domain, \
+ .enabled = true, \
+ .base = { \
+ .name = _name, \
+ .power_off = raspberrypi_domain_off, \
+ .power_on = raspberrypi_domain_on, \
+ }, \
+ }
+
+struct raspberrypi_power_domain {
+ u32 domain;
+ bool enabled;
+ struct generic_pm_domain base;
+};
+
+struct rpi_power_domain_packet {
+ u32 domain;
+ u32 on;
+} __packet;
It would be nice to use consequently rpi_ as prefix instead of
raspberrypi_ .
[...]
diff --git a/include/dt-bindings/arm/raspberrypi-power.h b/include/dt-bindings/arm/raspberrypi-power.h
new file mode 100644
index 0000000..51f0772
--- /dev/null
+++ b/include/dt-bindings/arm/raspberrypi-power.h
@@ -0,0 +1,14 @@
+/*
+ * Copyright © 2015 Broadcom
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _DT_BINDINGS_ARM_BCM2835_MBOX_POWER_H
+#define _DT_BINDINGS_ARM_BCM2835_MBOX_POWER_H
This needs renaming.
Thanks
Stefan
+
+#define RPI_POWER_DOMAIN_USB 3
+
+#endif /* _DT_BINDINGS_ARM_BCM2835_MBOX_POWER_H */
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