aspeed: add an I2C RTC device to all machines

The AST2500 EVB does not have an RTC but we can pretend that one is
plugged on the I2C bus header.

The romulus and witherspoon boards expects an Epson RX8900 I2C RTC but
a ds1338 is good enough for the basic features we need.
Signed-off-by: NCédric Le Goater <clg@kaod.org>
Reviewed-by: NAndrew Jeffery <andrew@aj.id.au>
Message-id: 20180530064049.27976-4-clg@kaod.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/aspeed.c

@@ -88,6 +88,7 @@ enum {
 
 static void palmetto_bmc_i2c_init(AspeedBoardState *bmc);
 static void ast2500_evb_i2c_init(AspeedBoardState *bmc);
+static void romulus_bmc_i2c_init(AspeedBoardState *bmc);
 static void witherspoon_bmc_i2c_init(AspeedBoardState *bmc);
 
 static const AspeedBoardConfig aspeed_boards[] = {
@@ -113,6 +114,7 @@ static const AspeedBoardConfig aspeed_boards[] = {
         .fmc_model = "n25q256a",
         .spi_model = "mx66l1g45g",
         .num_cs    = 2,
+        .i2c_init  = romulus_bmc_i2c_init,
     },
     [WITHERSPOON_BMC]  = {
         .soc_name  = "ast2500-a1",
@@ -305,6 +307,10 @@ static void ast2500_evb_i2c_init(AspeedBoardState *bmc)
 
     /* The AST2500 EVB expects a LM75 but a TMP105 is compatible */
     i2c_create_slave(aspeed_i2c_get_bus(DEVICE(&soc->i2c), 7), "tmp105", 0x4d);
+
+    /* The AST2500 EVB does not have an RTC. Let's pretend that one is
+     * plugged on the I2C bus header */
+    i2c_create_slave(aspeed_i2c_get_bus(DEVICE(&soc->i2c), 11), "ds1338", 0x32);
 }
 
 static void ast2500_evb_init(MachineState *machine)
@@ -331,6 +337,15 @@ static const TypeInfo ast2500_evb_type = {
     .class_init = ast2500_evb_class_init,
 };
 
+static void romulus_bmc_i2c_init(AspeedBoardState *bmc)
+{
+    AspeedSoCState *soc = &bmc->soc;
+
+    /* The romulus board expects Epson RX8900 I2C RTC but a ds1338 is
+     * good enough */
+    i2c_create_slave(aspeed_i2c_get_bus(DEVICE(&soc->i2c), 11), "ds1338", 0x32);
+}
+
 static void romulus_bmc_init(MachineState *machine)
 {
     aspeed_board_init(machine, &aspeed_boards[ROMULUS_BMC]);
@@ -364,6 +379,10 @@ static void witherspoon_bmc_i2c_init(AspeedBoardState *bmc)
 
     /* The Witherspoon expects a TMP275 but a TMP105 is compatible */
     i2c_create_slave(aspeed_i2c_get_bus(DEVICE(&soc->i2c), 9), "tmp105", 0x4a);
+
+    /* The witherspoon board expects Epson RX8900 I2C RTC but a ds1338 is
+     * good enough */
+    i2c_create_slave(aspeed_i2c_get_bus(DEVICE(&soc->i2c), 11), "ds1338", 0x32);
 }
 
 static void witherspoon_bmc_init(MachineState *machine)