3 files changed, 44 insertions, 2 deletions
diff --git a/arch/arm/boot/dts/tegra30-cardhu-a02.dts b/arch/arm/boot/dts/tegra30-cardhu-a02.dts
new file mode 100644
index 000000000000..dd870b7f188b
--- /dev/null
+++ b/arch/arm/boot/dts/tegra30-cardhu-a02.dts
@@ -0,0 +1,11 @@
+/dts-v1/;
+
+/include/ "tegra30-cardhu.dtsi"
+
+/* This dts file support the cardhu A02 version of board */
+
+/ {
+	model = "NVIDIA Tegra30 Cardhu A02 evaluation board";
+	compatible = "nvidia,cardhu-a02", "nvidia,cardhu", "nvidia,tegra30";
+};
+
diff --git a/arch/arm/boot/dts/tegra30-cardhu-a04.dts b/arch/arm/boot/dts/tegra30-cardhu-a04.dts
new file mode 100644
index 000000000000..a4cae6c16ddf
--- /dev/null
+++ b/arch/arm/boot/dts/tegra30-cardhu-a04.dts
@@ -0,0 +1,10 @@
+/dts-v1/;
+
+/include/ "tegra30-cardhu.dtsi"
+
+/* This dts file support the cardhu A04 and later versions of board */
+
+/ {
+	model = "NVIDIA Tegra30 Cardhu A04 (A05, A06, A07) evaluation board";
+	compatible = "nvidia,cardhu-a04", "nvidia,cardhu", "nvidia,tegra30";
+};
diff --git a/arch/arm/boot/dts/tegra30-cardhu.dts b/arch/arm/boot/dts/tegra30-cardhu.dtsi
index 6f9daaead5f9..ba38527fcb7f 100644
--- a/arch/arm/boot/dts/tegra30-cardhu.dts
+++ b/arch/arm/boot/dts/tegra30-cardhu.dtsi
@@ -1,7 +1,28 @@
-/dts-v1/;
-
 /include/ "tegra30.dtsi"
 
+/**
+ * This file contains common DT entry for all fab version of Cardhu.
+ * There is multiple fab version of Cardhu starting from A01 to A07.
+ * Cardhu fab version A01 and A03 are not supported. Cardhu fab version
+ * A02 will have different sets of GPIOs for fixed regulator compare to
+ * Cardhu fab version A04. The Cardhu fab version A05, A06, A07 are
+ * compatible with fab version A04. Based on Cardhu fab version, the
+ * related dts file need to be chosen like for Cardhu fab version A02,
+ * use tegra30-cardhu-a02.dts, Cardhu fab version A04 and later, use
+ * tegra30-cardhu-a04.dts.
+ * The identification of board is done in two ways, by looking the sticker
+ * on PCB and by reading board id eeprom.
+ * The stciker will have number like 600-81291-1000-002 C.3. In this 4th
+ * number is the fab version like here it is 002 and hence fab version A02.
+ * The (downstream internal) U-Boot of Cardhu display the board-id as
+ * follows:
+ * BoardID: 0C5B, SKU: 0A01, Fab: 02, Rev: 45.00
+ * In this Fab version is 02 i.e. A02.
+ * The BoardID I2C eeprom is interfaced through i2c5 (pwr_i2c address 0x56).
+ * The location 0x8 of this eeprom contains the Fab version. It is 1 byte
+ * wide.
+ */
+
 / {
 	model = "NVIDIA Tegra30 Cardhu evaluation board";
 	compatible = "nvidia,cardhu", "nvidia,tegra30";