db820c: stop autoboot when vol- pressed
Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
diff --git a/board/qualcomm/dragonboard820c/dragonboard820c.c b/board/qualcomm/dragonboard820c/dragonboard820c.c
index f6307f3..6040787 100644
--- a/board/qualcomm/dragonboard820c/dragonboard820c.c
+++ b/board/qualcomm/dragonboard820c/dragonboard820c.c
@@ -1,7 +1,7 @@
/*
* Board init file for Dragonboard 820C
*
- * (C) Copyright 2017 Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@gmail.com>
+ * (C) Copyright 2017 Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
*
* SPDX-License-Identifier: GPL-2.0+
*/
@@ -14,6 +14,7 @@
#include <asm/io.h>
#include <linux/bitops.h>
#include <asm/psci.h>
+#include <asm/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
@@ -125,3 +126,38 @@
void reset_cpu(ulong addr)
{
psci_system_reset();
+}
+
+/* Check for vol- button - if pressed - stop autoboot */
+int misc_init_r(void)
+{
+ struct udevice *pon;
+ struct gpio_desc resin;
+ int node, ret;
+
+ ret = uclass_get_device_by_name(UCLASS_GPIO, "pm8994_pon@800", &pon);
+ if (ret < 0) {
+ printf("Failed to find PMIC pon node. Check device tree\n");
+ return 0;
+ }
+
+ node = fdt_subnode_offset(gd->fdt_blob, dev_of_offset(pon),
+ "key_vol_down");
+ if (node < 0) {
+ printf("Failed to find key_vol_down node. Check device tree\n");
+ return 0;
+ }
+
+ if (gpio_request_by_name_nodev(offset_to_ofnode(node), "gpios", 0,
+ &resin, 0)) {
+ printf("Failed to request key_vol_down button.\n");
+ return 0;
+ }
+
+ if (dm_gpio_get_value(&resin)) {
+ env_set("bootdelay", "-1");
+ printf("Power button pressed - dropping to console.\n");
+ }
+
+ return 0;
+}