Add lemp9

src/board/system76/lemp9/smbus.c

@@ -0,0 +1,24 @@
+#include <board/smbus.h>
+#include <ec/i2c.h>
+
+void smbus_init(void) {
+    // 9.2 MHz * 4.7 us = 43.24
+    SMB4P7USL = 43;
+    // 9.2 MHz * 4.0 us = 36.8
+    SMB4P0USL = 37;
+    // 9.2 MHz * 300 ns = 2.76
+    SMB300NS = 3;
+    // 9.2 MHz * 250 ns = 2.3
+    SMB250NS = 2;
+    // 1.024 KHz * 25 ms = 25.6
+    SMB25MS = 26;
+    // 9.2 MHz * 45.3 us = 416.76 (0x01A1)
+    SMB45P3USL = 0xA1;
+    SMB45P3USH = 0x01;
+
+    // Clock set to 50 KHz
+    // SCLKTSA = 1;
+
+    // Set up for i2c usage
+    i2c_reset(true);
+}