Hello Kane,
On 9/17/25 03:31, Kane Chen wrote:
From: Kane-Chen-AS <kane_c...@aspeedtech.com>
AST27x0 platforms can attach up to two AST1700 IO expander boards.
what are AST1700 IO expanders ? How are they attached to the main
board ? on which bus ?
Introduce the 'ioexps-num' property to let users specify how many
IO expanders to instantiate for a given machine.
> This enables modeling board variants that ship with 0-2 expanders.
Note: AST2500 and AST2600 do not support IO expanders; this property
is only available on AST27x0 machines.
Command usage:
```
./qemu-system-aarch64 -M ast2700a1-evb,ioexps-num=2 \
-drive image-bmc,format=raw,if=mtd \
...
```
I would prefer these changes modifying the uapi to come at the end
when the modeling is done.
Thanks,
C.
Signed-off-by: Kane-Chen-AS <kane_c...@aspeedtech.com>
---
include/hw/arm/aspeed_soc.h | 2 ++
hw/arm/aspeed.c | 49 +++++++++++++++++++++++++++++++++++++
2 files changed, 51 insertions(+)
diff --git a/include/hw/arm/aspeed_soc.h b/include/hw/arm/aspeed_soc.h
index 217ef0eafd..77263cc6ec 100644
--- a/include/hw/arm/aspeed_soc.h
+++ b/include/hw/arm/aspeed_soc.h
@@ -49,6 +49,7 @@
#define ASPEED_MACS_NUM 4
#define ASPEED_UARTS_NUM 13
#define ASPEED_JTAG_NUM 2
+#define ASPEED_IOEXP_NUM 2
struct AspeedSoCState {
DeviceState parent;
@@ -103,6 +104,7 @@ struct AspeedSoCState {
UnimplementedDeviceState ltpi;
UnimplementedDeviceState jtag[ASPEED_JTAG_NUM];
AspeedAPB2OPBState fsi[2];
+ uint8_t ioexp_num;
};
#define TYPE_ASPEED_SOC "aspeed-soc"
diff --git a/hw/arm/aspeed.c b/hw/arm/aspeed.c
index c31bbe7701..593cb87bfe 100644
--- a/hw/arm/aspeed.c
+++ b/hw/arm/aspeed.c
@@ -32,6 +32,7 @@
#include "qemu/units.h"
#include "hw/qdev-clock.h"
#include "system/system.h"
+#include "qapi/visitor.h"
static struct arm_boot_info aspeed_board_binfo = {
.board_id = -1, /* device-tree-only board */
@@ -49,6 +50,7 @@ struct AspeedMachineState {
char *fmc_model;
char *spi_model;
uint32_t hw_strap1;
+ uint32_t ioexp_num;
};
/* On 32-bit hosts, lower RAM to 1G because of the 2047 MB limit */
@@ -444,6 +446,9 @@ static void aspeed_machine_init(MachineState *machine)
OBJECT(get_system_memory()), &error_abort);
object_property_set_link(OBJECT(bmc->soc), "dram",
OBJECT(machine->ram), &error_abort);
+
+ bmc->soc->ioexp_num = bmc->ioexp_num;
+
if (amc->sdhci_wp_inverted) {
for (i = 0; i < bmc->soc->sdhci.num_slots; i++) {
object_property_set_bool(OBJECT(&bmc->soc->sdhci.slots[i]),
@@ -1486,6 +1491,49 @@ static void
aspeed_machine_ast2600_class_emmc_init(ObjectClass *oc)
"Set or unset boot from EMMC");
}
+#ifdef TARGET_AARCH64
+static void aspeed_get_ioexps_num(Object *obj,
+ Visitor *v,
+ const char *name,
+ void *opaque,
+ Error **errp)
+{
+ AspeedMachineState *bmc = ASPEED_MACHINE(obj);
+
+ visit_type_uint32(v, name, &bmc->ioexp_num, errp);
+}
+
+static void aspeed_set_ioexps_num(Object *obj,
+ Visitor *v,
+ const char *name,
+ void *opaque,
+ Error **errp)
+{
+ uint32_t val;
+ AspeedMachineState *bmc = ASPEED_MACHINE(obj);
+
+ if (!visit_type_uint32(v, name, &val, errp)) {
+ return;
+ }
+
+ if (val > ASPEED_IOEXP_NUM) {
+ error_setg(errp, "IOEXP number is exceeded: %d", val);
+ return;
+ }
+
+ bmc->ioexp_num = val;
+}
+
+
+static void aspeed_machine_ast1700_class_init(ObjectClass *oc)
+{
+ object_class_property_add(oc, "ioexps-num", "uint32",
+ aspeed_get_ioexps_num,
+ aspeed_set_ioexps_num,
+ NULL, NULL);
+}
+#endif
+
static void aspeed_machine_class_init(ObjectClass *oc, const void *data)
{
MachineClass *mc = MACHINE_CLASS(oc);
@@ -2032,6 +2080,7 @@ static void
aspeed_machine_ast2700a1_evb_class_init(ObjectClass *oc,
mc->auto_create_sdcard = true;
mc->default_ram_size = 1 * GiB;
aspeed_machine_class_init_cpus_defaults(mc);
+ aspeed_machine_ast1700_class_init(oc);
}
#endif
