[PATCH v2 07/10] ARM: dts: meson: add the hardware random number generator

[martin.blumenstingl@googlemail.com (Martin Blumenstingl)]

All supported Meson SoCs have a random number generator in CBUS.
Newer SoCs (GXBB, GXL and GXM) provide only one 32-bit random number
register, whereas the older SoCs (Meson6, Meson8 and Meson8b) have two
32-bit random number registers. The existing meson-rng driver only
supports the lower 32-bit - but it still works fine on the older SoCs
apart from this small limitation.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
---
 arch/arm/boot/dts/meson.dtsi   | 5 +++++
 arch/arm/boot/dts/meson8.dtsi  | 6 ++++++
 arch/arm/boot/dts/meson8b.dtsi | 6 ++++++
 3 files changed, 17 insertions(+)

diff --git a/arch/arm/boot/dts/meson.dtsi b/arch/arm/boot/dts/meson.dtsi
index 46706d74a145..bf37606ba82e 100644
--- a/arch/arm/boot/dts/meson.dtsi
+++ b/arch/arm/boot/dts/meson.dtsi
@@ -80,6 +80,11 @@
 			#size-cells = <1>;
 			ranges = <0x0 0xc1100000 0x200000>;
 
+			hwrng: rng at 8100 {
+				compatible = "amlogic,meson-rng";
+				reg = <0x8100 0x8>;
+			};
+
 			uart_A: serial at 84c0 {
 				compatible = "amlogic,meson-uart";
 				reg = <0x84c0 0x18>;
diff --git a/arch/arm/boot/dts/meson8.dtsi b/arch/arm/boot/dts/meson8.dtsi
index df79a34a3530..b4c5fdd7b451 100644
--- a/arch/arm/boot/dts/meson8.dtsi
+++ b/arch/arm/boot/dts/meson8.dtsi
@@ -241,6 +241,12 @@
 	clock-names = "stmmaceth";
 };
 
+&hwrng {
+	compatible = "amlogic,meson8-rng", "amlogic,meson-rng";
+	clocks = <&clkc CLKID_RNG0>;
+	clock-names = "core";
+};
+
 &i2c_AO {
 	clocks = <&clkc CLKID_CLK81>;
 };
diff --git a/arch/arm/boot/dts/meson8b.dtsi b/arch/arm/boot/dts/meson8b.dtsi
index 1c09090ff4a5..a9d7074e6369 100644
--- a/arch/arm/boot/dts/meson8b.dtsi
+++ b/arch/arm/boot/dts/meson8b.dtsi
@@ -171,6 +171,12 @@
 	};
 };
 
+&hwrng {
+	compatible = "amlogic,meson8b-rng", "amlogic,meson-rng";
+	clocks = <&clkc CLKID_RNG0>;
+	clock-names = "core";
+};
+
 &L2 {
 	arm,data-latency = <3 3 3>;
 	arm,tag-latency = <2 2 2>;
-- 
2.13.1