[U-Boot] [PATCH 1/3] rockchip: boot mode: parse adc channel from dts

[Andy Yan]

Most the current rockchip based boards use adc channel
1 detect the download key, but there are also some
boards like rv1108 based plaform use adc channel 0.
So we parse the adc channel from dts if we can get
it, otherwise we use the channel 1 as default.

Signed-off-by: Andy Yan <andy.yan at rock-chips.com>

---

 arch/arm/mach-rockchip/boot_mode.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-rockchip/boot_mode.c b/arch/arm/mach-rockchip/boot_mode.c
index 942849f..49dfd39 100644
--- a/arch/arm/mach-rockchip/boot_mode.c
+++ b/arch/arm/mach-rockchip/boot_mode.c
@@ -8,6 +8,9 @@
 #include <adc.h>
 #include <asm/io.h>
 #include <asm/arch/boot_mode.h>
+#include <fdtdec.h>
+
+DECLARE_GLOBAL_DATA_PTR;
 
 void set_back_to_bootrom_dnl_flag(void)
 {
@@ -26,9 +29,19 @@ void set_back_to_bootrom_dnl_flag(void)
 
 __weak int rockchip_dnl_key_pressed(void)
 {
+	const void *blob = gd->fdt_blob;
 	unsigned int val;
+	int channel = 1;
+	int node;
+	u32 chns[2];
+
+	node = fdt_node_offset_by_compatible(blob, 0, "adc-keys");
+	if (node >= 0) {
+		if (!fdtdec_get_int_array(blob, node, "io-channels", chns, 2))
+			channel = chns[1];
+	}
 
-	if (adc_channel_single_shot("saradc", 1, &val)) {
+	if (adc_channel_single_shot("saradc", channel, &val)) {
 		pr_err("%s: adc_channel_single_shot fail!\n", __func__);
 		return false;
 	}
-- 
2.7.4