hw/arm: quanta-gbs-bmc add i2c comments

Add a comment and i2c method that describes the board layout.

Tested: firmware booted to userspace.
Signed-off-by: Patrick Venture <venture@google.com>
Reviewed-by: Brandon Kim <brandonkim@google.com>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
Message-id: 20210608193605.2611114-3-venture@google.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/npcm7xx_boards.c

@@ -238,6 +238,65 @@ static void quanta_gsj_fan_init(NPCM7xxMachine *machine, NPCM7xxState *soc)
     npcm7xx_connect_pwm_fan(soc, &splitter[2], 0x05, 1);
 }
 
+static void quanta_gbs_i2c_init(NPCM7xxState *soc)
+{
+    /*
+     * i2c-0:
+     *     pca9546@71
+     *
+     * i2c-1:
+     *     pca9535@24
+     *     pca9535@20
+     *     pca9535@21
+     *     pca9535@22
+     *     pca9535@23
+     *     pca9535@25
+     *     pca9535@26
+     *
+     * i2c-2:
+     *     sbtsi@4c
+     *
+     * i2c-5:
+     *     atmel,24c64@50 mb_fru
+     *     pca9546@71
+     *         - channel 0: max31725@54
+     *         - channel 1: max31725@55
+     *         - channel 2: max31725@5d
+     *                      atmel,24c64@51 fan_fru
+     *         - channel 3: atmel,24c64@52 hsbp_fru
+     *
+     * i2c-6:
+     *     pca9545@73
+     *
+     * i2c-7:
+     *     pca9545@72
+     *
+     * i2c-8:
+     *     adi,adm1272@10
+     *
+     * i2c-9:
+     *     pca9546@71
+     *         - channel 0: isil,isl68137@60
+     *         - channel 1: isil,isl68137@61
+     *         - channel 2: isil,isl68137@63
+     *         - channel 3: isil,isl68137@45
+     *
+     * i2c-10:
+     *     pca9545@71
+     *
+     * i2c-11:
+     *     pca9545@76
+     *
+     * i2c-12:
+     *     maxim,max34451@4e
+     *     isil,isl68137@5d
+     *     isil,isl68137@5e
+     *
+     * i2c-14:
+     *     pca9545@70
+     */
+}
+
 static void npcm750_evb_init(MachineState *machine)
 {
     NPCM7xxState *soc;
@@ -282,6 +341,7 @@ static void quanta_gbs_init(MachineState *machine)
     npcm7xx_connect_flash(&soc->fiu[0], 0, "mx66u51235f",
                           drive_get(IF_MTD, 0, 0));
 
+    quanta_gbs_i2c_init(soc);
     npcm7xx_load_kernel(machine, soc);
 }