arm64: dts: stratix10: enable i2c, add i2c periperals

Add clock for i2c
Enable i2c1
Set the i2c bus speed to 100KHz
Add the following i2c peripherals
* ds1339 RTC
* 24c32 EEPROM
* max1619 temperature monitor
* ltc2497 ADC
  * Add a fixed regulator for the ADC's Vref.

This requires Dinh Nguyen's Stratix10 clock driver
("clk: socfpga: stratix10: add clock driver for Stratix10 platform")
Signed-off-by: Alan Tull <atull@kernel.org>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>

arch/arm64/boot/dts/altera/socfpga_stratix10.dtsi

@@ -207,6 +207,7 @@ i2c0: i2c@ffc02800 {
 			reg = <0xffc02800 0x100>;
 			interrupts = <0 103 4>;
 			resets = <&rst I2C0_RESET>;
+			clocks = <&clkmgr STRATIX10_L4_SP_CLK>;
 			status = "disabled";
 		};
 
@@ -217,6 +218,7 @@ i2c1: i2c@ffc02900 {
 			reg = <0xffc02900 0x100>;
 			interrupts = <0 104 4>;
 			resets = <&rst I2C1_RESET>;
+			clocks = <&clkmgr STRATIX10_L4_SP_CLK>;
 			status = "disabled";
 		};
 
@@ -227,6 +229,7 @@ i2c2: i2c@ffc02a00 {
 			reg = <0xffc02a00 0x100>;
 			interrupts = <0 105 4>;
 			resets = <&rst I2C2_RESET>;
+			clocks = <&clkmgr STRATIX10_L4_SP_CLK>;
 			status = "disabled";
 		};
 
@@ -237,6 +240,7 @@ i2c3: i2c@ffc02b00 {
 			reg = <0xffc02b00 0x100>;
 			interrupts = <0 106 4>;
 			resets = <&rst I2C3_RESET>;
+			clocks = <&clkmgr STRATIX10_L4_SP_CLK>;
 			status = "disabled";
 		};
 
@@ -247,6 +251,7 @@ i2c4: i2c@ffc02c00 {
 			reg = <0xffc02c00 0x100>;
 			interrupts = <0 107 4>;
 			resets = <&rst I2C4_RESET>;
+			clocks = <&clkmgr STRATIX10_L4_SP_CLK>;
 			status = "disabled";
 		};
 

arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dts

@@ -51,6 +51,13 @@ memory {
 		reg = <0 0 0 0>;
 	};
 
+	ref_033v: 033-v-ref {
+		compatible = "regulator-fixed";
+		regulator-name = "0.33V";
+		regulator-min-microvolt = <330000>;
+		regulator-max-microvolt = <330000>;
+	};
+
 	soc {
 		clocks {
 			osc1 {
@@ -113,3 +120,30 @@ &usb0 {
 &watchdog0 {
 	status = "okay";
 };
+
+&i2c1 {
+	status = "okay";
+	clock-frequency = <100000>;
+
+	adc@14 {
+		compatible = "lltc,ltc2497";
+		reg = <0x14>;
+		vref-supply = <&ref_033v>;
+	};
+
+	temp@4c {
+		compatible = "maxim,max1619";
+		reg = <0x4c>;
+	};
+
+	eeprom@51 {
+		compatible = "atmel,24c32";
+		reg = <0x51>;
+		pagesize = <32>;
+	};
+
+	rtc@68 {
+		compatible = "dallas,ds1339";
+		reg = <0x68>;
+	};
+};