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Date: Wed, 14 Nov 2018 08:26:58 +0100
From: Florian Eckert <fe@....tdt.de>
To: linus.walleij@...aro.org, tglx@...utronix.de, mingo@...hat.com,
bp@...en8.de, andy.shevchenko@...il.com, joe@...ches.com,
chunkeey@...il.com, piotr.krol@...eb.com, dvhart@...radead.org
Cc: linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: [PATCH v3 2/2] kernel: Add reset button platform device for APU2/APU3
This will add a x86 platform device "gpio-keys-polled" which uses the
new gpio-apu drive for APU2 and APU3 boards from PC Engines.
Signed-off-by: Florian Eckert <fe@....tdt.de>
---
arch/x86/Kconfig | 14 ++++++++
arch/x86/platform/Makefile | 1 +
arch/x86/platform/amd/Makefile | 1 +
arch/x86/platform/amd/apu.c | 72 ++++++++++++++++++++++++++++++++++++++++++
4 files changed, 88 insertions(+)
create mode 100644 arch/x86/platform/amd/Makefile
create mode 100644 arch/x86/platform/amd/apu.c
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9d734f3c8234..97c53286fdb6 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2820,6 +2820,20 @@ config TS5500
endif # X86_32
+if X86_64
+config APU
+ bool "PCEngines APU System Support"
+ help
+ This option enables system support for the PCEngines APU platform.
+ At present this just sets up the reset button control on
+ APU2/APU3 boards. However, other system specific setup should
+ get added here.
+
+ Note: You must still enable the drivers for GPIO and LED support
+ (GPIO_APU & LEDS_APU) to actually use the LEDs and the GPIOs
+
+endif # X86_64
+
config AMD_NB
def_bool y
depends on CPU_SUP_AMD && PCI
diff --git a/arch/x86/platform/Makefile b/arch/x86/platform/Makefile
index d0e835470d01..a95d18810c29 100644
--- a/arch/x86/platform/Makefile
+++ b/arch/x86/platform/Makefile
@@ -1,6 +1,7 @@
# SPDX-License-Identifier: GPL-2.0
# Platform specific code goes here
obj-y += atom/
+obj-y += amd/
obj-y += ce4100/
obj-y += efi/
obj-y += geode/
diff --git a/arch/x86/platform/amd/Makefile b/arch/x86/platform/amd/Makefile
new file mode 100644
index 000000000000..bf04c5799d7f
--- /dev/null
+++ b/arch/x86/platform/amd/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_APU) +=apu.o
diff --git a/arch/x86/platform/amd/apu.c b/arch/x86/platform/amd/apu.c
new file mode 100644
index 000000000000..a4b695881177
--- /dev/null
+++ b/arch/x86/platform/amd/apu.c
@@ -0,0 +1,72 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * System Specific setup for PC-Engines APU2/APU3 devices
+ *
+ * Copyright (C) 2018 Florian Eckert <fe@....tdt.de>
+ */
+
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/input.h>
+#include <linux/gpio_keys.h>
+#include <linux/dmi.h>
+
+static struct gpio_keys_button apu_gpio_buttons[] = {
+ {
+ .code = KEY_RESTART,
+ .gpio = 20,
+ .active_low = 1,
+ .desc = "Reset button",
+ .type = EV_KEY,
+ .debounce_interval = 60,
+ }
+};
+
+static struct gpio_keys_platform_data apu_buttons_data = {
+ .buttons = apu_gpio_buttons,
+ .nbuttons = ARRAY_SIZE(apu_gpio_buttons),
+ .poll_interval = 20,
+};
+
+static struct platform_device apu_buttons_dev = {
+ .name = "gpio-keys-polled",
+ .id = 1,
+ .dev = {
+ .platform_data = &apu_buttons_data,
+ }
+};
+
+static struct platform_device *apu_devs[] __initdata = {
+ &apu_buttons_dev,
+};
+
+static void __init register_apu(void)
+{
+ /* Setup push button control through gpio-apu driver */
+ platform_add_devices(apu_devs, ARRAY_SIZE(apu_devs));
+}
+
+static int __init apu_init(void)
+{
+ if (!dmi_match(DMI_SYS_VENDOR, "PC Engines")) {
+ pr_err("No PC Engines board detected\n");
+ return -ENODEV;
+ }
+
+ if (!(dmi_match(DMI_PRODUCT_NAME, "APU2") ||
+ dmi_match(DMI_PRODUCT_NAME, "apu2") ||
+ dmi_match(DMI_PRODUCT_NAME, "PC Engines apu2") ||
+ dmi_match(DMI_PRODUCT_NAME, "APU3") ||
+ dmi_match(DMI_PRODUCT_NAME, "apu3") ||
+ dmi_match(DMI_PRODUCT_NAME, "PC Engines apu3"))) {
+ pr_err("Unknown PC Engines board: %s\n",
+ dmi_get_system_info(DMI_PRODUCT_NAME));
+ return -ENODEV;
+ }
+
+ register_apu();
+
+ return 0;
+}
+
+device_initcall(apu_init);
--
2.11.0
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