[PATCH v4 6/7] hw/nvram: Update at24c EEPROM init function in NPCM7xx boards

[Hao Wu <wuhaotsh@google.com>]

We made 3 changes to the at24c_eeprom_init function in
npcm7xx_boards.c:

1. We allow the function to take a I2CBus* as parameter. This allows
   us to attach an EEPROM device behind an I2C mux which is not
   possible with the old method.

2. We make at24c EEPROMs are backed by drives so that we can
   specify the content of the EEPROMs.

3. Instead of using i2c address as unit number, This patch assigns
   unique unit numbers for each eeproms in each board. This avoids
   conflict in providing multiple eeprom contents with the same address.
   In the old method if we specify two drives with the same unit number,
   the following error will occur: `Device with id 'none85' exists`.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
---
 hw/arm/npcm7xx_boards.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/hw/arm/npcm7xx_boards.c b/hw/arm/npcm7xx_boards.c
index dec7d16ae5..9121e081fa 100644
--- a/hw/arm/npcm7xx_boards.c
+++ b/hw/arm/npcm7xx_boards.c
@@ -126,13 +126,17 @@ static I2CBus *npcm7xx_i2c_get_bus(NPCM7xxState *soc, uint32_t num)
     return I2C_BUS(qdev_get_child_bus(DEVICE(&soc->smbus[num]), "i2c-bus"));
 }
 
-static void at24c_eeprom_init(NPCM7xxState *soc, int bus, uint8_t addr,
-                              uint32_t rsize)
+static void at24c_eeprom_init(I2CBus *i2c_bus, int bus, uint8_t addr,
+                              uint32_t rsize, int unit_number)
 {
-    I2CBus *i2c_bus = npcm7xx_i2c_get_bus(soc, bus);
     I2CSlave *i2c_dev = i2c_slave_new("at24c-eeprom", addr);
     DeviceState *dev = DEVICE(i2c_dev);
+    DriveInfo *dinfo;
 
+    dinfo = drive_get(IF_OTHER, bus, unit_number);
+    if (dinfo) {
+        qdev_prop_set_drive(dev, "drive", blk_by_legacy_dinfo(dinfo));
+    }
     qdev_prop_set_uint32(dev, "rom-size", rsize);
     i2c_slave_realize_and_unref(i2c_dev, i2c_bus, &error_abort);
 }
@@ -239,8 +243,8 @@ static void quanta_gsj_i2c_init(NPCM7xxState *soc)
     i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 3), "tmp105", 0x5c);
     i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 4), "tmp105", 0x5c);
 
-    at24c_eeprom_init(soc, 9, 0x55, 8192);
-    at24c_eeprom_init(soc, 10, 0x55, 8192);
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 9), 9, 0x55, 8192, 0);
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 10), 10, 0x55, 8192, 1);
 
     /*
      * i2c-11:
-- 
2.33.1.1089.g2158813163f-goog