ppc/pnv: Add pca9552 to powernv10-rainier for PCIe hotplug power control

The Power Hypervisor code expects to see a pca9552 device connected
to the 3rd PNV I2C engine on port 1 at I2C address 0x63 (or left-
justified address of 0xC6).  This is used by hypervisor code to
control PCIe slot power during hotplug events.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

hw/ppc/Kconfig

@@ -32,6 +32,7 @@ config POWERNV
     select XIVE
     select FDT_PPC
     select PCI_POWERNV
+    select PCA9552
 
 config PPC405
     bool

hw/ppc/pnv.c

@@ -790,6 +790,7 @@ static void pnv_init(MachineState *machine)
     const char *bios_name = machine->firmware ?: FW_FILE_NAME;
     PnvMachineState *pnv = PNV_MACHINE(machine);
     MachineClass *mc = MACHINE_GET_CLASS(machine);
+    PnvMachineClass *pmc = PNV_MACHINE_GET_CLASS(machine);
     char *fw_filename;
     long fw_size;
     uint64_t chip_ram_start = 0;
@@ -979,6 +980,13 @@ static void pnv_init(MachineState *machine)
      */
     pnv->powerdown_notifier.notify = pnv_powerdown_notify;
     qemu_register_powerdown_notifier(&pnv->powerdown_notifier);
+
+    /*
+     * Create/Connect any machine-specific I2C devices
+     */
+    if (pmc->i2c_init) {
+        pmc->i2c_init(pnv);
+    }
 }
 
 /*
@@ -1879,6 +1887,21 @@ static void pnv_chip_power10_realize(DeviceState *dev, Error **errp)
                               qdev_get_gpio_in(DEVICE(&chip10->psi),
                                                PSIHB9_IRQ_SBE_I2C));
     }
+
+}
+
+static void pnv_rainier_i2c_init(PnvMachineState *pnv)
+{
+    int i;
+    for (i = 0; i < pnv->num_chips; i++) {
+        Pnv10Chip *chip10 = PNV10_CHIP(pnv->chips[i]);
+
+        /*
+         * Add a PCA9552 I2C device for PCIe hotplug control
+         * to engine 2, bus 1, address 0x63
+         */
+        i2c_slave_create_simple(chip10->i2c[2].busses[1], "pca9552", 0x63);
+    }
 }
 
 static uint32_t pnv_chip_power10_xscom_pcba(PnvChip *chip, uint64_t addr)
@@ -2286,9 +2309,11 @@ static void pnv_machine_power10_class_init(ObjectClass *oc, void *data)
 static void pnv_machine_p10_rainier_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
+    PnvMachineClass *pmc = PNV_MACHINE_CLASS(oc);
 
     pnv_machine_p10_common_class_init(oc, data);
     mc->desc = "IBM PowerNV (Non-Virtualized) POWER10 Rainier";
+    pmc->i2c_init = pnv_rainier_i2c_init;
 }
 
 static bool pnv_machine_get_hb(Object *obj, Error **errp)

include/hw/ppc/pnv.h

@@ -76,6 +76,7 @@ struct PnvMachineClass {
     int compat_size;
 
     void (*dt_power_mgt)(PnvMachineState *pnv, void *fdt);
+    void (*i2c_init)(PnvMachineState *pnv);
 };
 
 struct PnvMachineState {