enabled i2c0

u-boot-tree/arch/arm/dts/elphel393.dts

@@ -15,6 +15,7 @@
 	aliases {
 		serial0 = &uart0;
                 mmc0 = &sdhci0;
+                i2c0 = &i2c0;
 	};
 
         chosen {
@@ -36,3 +37,8 @@
         u-boot,dm-pre-reloc;
         status = "okay";
 };
+
+&i2c0 {
+        status = "okay";
+        clock-frequency = <400000>;
+};

u-boot-tree/configs/elphel393_defconfig

@@ -18,3 +18,6 @@ CONFIG_SPI_FLASH_WINBOND=n
 CONFIG_ZYNQ_GEM=y
 CONFIG_ZYNQ_QSPI=n
 CONFIG_CMD_NAND=y
+
+# CONFIG_CMD_I2C=y
+CONFIG_DM_I2C=n

u-boot-tree/include/configs/elphel393.h

@@ -70,7 +70,10 @@
 /*redefined in zynq-common.h*/
 /*#undef CONFIG_CMD_NAND*/
 
+#define CONFIG_ZYNQ_I2C0
+
 #include <configs/zynq-common.h>
+
 #undef CONFIG_SYS_PROMPT
 #undef CONFIG_BOOTDELAY
 #undef CONFIG_EXTRA_ENV_SETTINGS