pcengines/apu1: Add ACPI led, button and GPIO devices.
Provide ACPI devices with devicetree-compatible annotations for the
three leds and the button of the APU1, as well as the GPIO driver.
This will cause the Linux kernel to automatically load the following
modules:
leds_gpio (CONFIG_LEDS_GPIO)
gpio_keys_polled (CONFIG_KEYBOARD_GPIO_POLLED)
gpio_sb8xx (CONFIG_GPIO_SB8XX)
See
http://events.linuxfoundation.org/sites/events/files/slides/ACPI_vs_DT.pdf
and https://lwn.net/Articles/612062/ for some more information on how
the PRP0001 HID works.
To make this usable a Linux GPIO driver for the AMD chipset is also
required, which I am currently working on, but have not submitted
upstream yet.
Leds have been named after the convention in
Documentation/leds/leds-class.txt:
LED Device Naming
=================
Is currently of the form:
"devicename:colour:function"
For comparison, on an OpenWRT device:
GPIOs 0-21, ath79:
gpio-1 (tp-link:green:usb ) out hi
gpio-2 (tp-link:green:system) out lo
gpio-3 (reset ) in hi
gpio-5 (tp-link:green:qss ) out lo
gpio-7 (qss ) in hi
gpio-9 (tp-link:green:wlan ) out lo
gpio-18 (rtl8366rb ) in hi
gpio-19 (rtl8366rb ) in hi
On the apu1:
GPIOs 288-511, platform/PRP0001:00, AMD SB8XX/SB9XX/A5X/A8X GPIO driver:
gpio-475 (switch1 ) in hi
gpio-477 (apu1:green:led1 ) out hi
gpio-478 (apu1:green:led2 ) out hi
gpio-479 (apu1:green:led3 ) out hi
Change-Id: I956ee92d9d98ef27a83ccb30d314543bd8634f2c
Signed-off-by: Tobias Diedrich <ranma+coreboot@tdiedrich.de>
Reviewed-on: http://review.coreboot.org/10540
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
diff --git a/src/mainboard/pcengines/apu1/acpi/leds.asl b/src/mainboard/pcengines/apu1/acpi/leds.asl
new file mode 100644
index 0000000..ce4a0c8
--- /dev/null
+++ b/src/mainboard/pcengines/apu1/acpi/leds.asl
@@ -0,0 +1,80 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Based on the example of Mika Westerberg: https://lwn.net/Articles/612062/
+ *
+ * Copyright (C) 2015 Tobias Diedrich, Mika Westerberg
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc.
+ */
+
+Scope (\_SB.PCI0.SBUS)
+{
+ Device (LEDS)
+ {
+ Name (_HID, "PRP0001")
+
+ Name (_CRS, ResourceTemplate () {
+ GpioIo (Exclusive, PullUp, 0, 0, IoRestrictionOutputOnly,
+ "\\_SB.PCI0.SBUS.GPIO", 0, ResourceConsumer) {189, 190, 191}
+ })
+
+ Name (_DSD, Package () {
+ ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+ Package () {
+ Package () {"compatible", Package () {"gpio-leds"}},
+ }
+ })
+
+ Device (LED1)
+ {
+ Name (_DSD, Package () {
+ ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+ Package () {
+ /*
+ * From Linux Documentation/leds/leds-class.txt:
+ * LED Device Naming
+ * Is currently of the form:
+ * "devicename:colour:function"
+ */
+ Package () {"label", "apu1:green:led1"},
+ Package () {"gpios", Package () {^^LEDS, 0, 0, 1 /* low-active */}},
+ Package () {"default-state", "keep"},
+ } }) }
+
+ Device (LED2)
+ {
+ Name (_DSD, Package () {
+ ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+ Package () {
+ Package () {"label", "apu1:green:led2"},
+ Package () {"gpios", Package () {^^LEDS, 0, 1, 1 /* low-active */}},
+ Package () {"default-state", "keep"},
+ }
+ })
+ }
+
+ Device (LED3)
+ {
+ Name (_DSD, Package () {
+ ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+ Package () {
+ Package () {"label", "apu1:green:led3"},
+ Package () {"gpios", Package () {^^LEDS, 0, 2, 1 /* low-active */}},
+ Package () {"default-state", "keep"},
+ }
+ })
+ }
+ }
+}