[PATCH v2 3/3] hw/arm/aspeed: g220a: Add a latching switch device

[Jian Zhang]

Add a latching switch device connect between g220a BMC machind(soc
gpio) as host-power.

The latching switch device default state is off and trigger edge is
falling edge.

Tested:
In qemu, use g220a image

~# ipmitool power status
Chassis Power is off

~# ipmitool power on
Chassis Power Control: Up/On

~# ipmitool power status
Chassis Power is on

~# ipmitool power off
Chassis Power Control: Down/Off

~# ipmitool power status
Chassis Power is off

Signed-off-by: Jian Zhang <zhangjian.3032@bytedance.com>
---
 hw/arm/Kconfig  |  1 +
 hw/arm/aspeed.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/hw/arm/Kconfig b/hw/arm/Kconfig
index 15fa79afd3..f2455db5a0 100644
--- a/hw/arm/Kconfig
+++ b/hw/arm/Kconfig
@@ -457,6 +457,7 @@ config ASPEED_SOC
     select LED
     select PMBUS
     select MAX31785
+    select LATCHING_SWITCH
 
 config MPS2
     bool
diff --git a/hw/arm/aspeed.c b/hw/arm/aspeed.c
index bc3ecdb619..070de3aeff 100644
--- a/hw/arm/aspeed.c
+++ b/hw/arm/aspeed.c
@@ -27,6 +27,7 @@
 #include "qemu/units.h"
 #include "hw/qdev-clock.h"
 #include "sysemu/sysemu.h"
+#include "hw/misc/latching_switch.h"
 
 static struct arm_boot_info aspeed_board_binfo = {
     .board_id = -1, /* device-tree-only board */
@@ -666,6 +667,25 @@ static void g220a_bmc_i2c_init(AspeedMachineState *bmc)
     };
     smbus_eeprom_init_one(aspeed_i2c_get_bus(&soc->i2c, 4), 0x57,
                           eeprom_buf);
+
+    /* Add a host-power device */
+    LatchingSwitchState *power =
+        latching_switch_create_simple(OBJECT(bmc),
+                                      false, TRIGGER_EDGE_FALLING);
+
+    /*
+     * connect the input to soc(out, power button)
+     * the power button in g220a is 215
+     */
+    qdev_connect_gpio_out(DEVICE(&bmc->soc.gpio), 215,
+                          qdev_get_gpio_in(DEVICE(power), 0));
+
+    /*
+     * connect the output to soc(in, power good signal)
+     * the power good in g220a is 209
+     */
+    qdev_connect_gpio_out(DEVICE(power), 0,
+                          qdev_get_gpio_in(DEVICE(&bmc->soc.gpio), 209));
 }
 
 static void aspeed_eeprom_init(I2CBus *bus, uint8_t addr, uint32_t rsize)
-- 
2.25.1