hw/ssi/pnv_spi: Make bus names distinct for each controllers of a socket

Create a spi buses with distinct names on each socket so that responders
are attached to correct SPI controllers.

Change the bus name to chipX.spi.<busnum> where X = 0..<num_sockets>

QOM tree on a 2 socket machine:
(qemu) info qom-tree
/machine (powernv10-machine)
  /chip[0] (power10_v2.0-pnv-chip)
    /pib_spic[0] (pnv-spi)
      /chip0.spi.0 (SSI)
      /xscom-spi[0] (memory-region)
  /chip[1] (power10_v2.0-pnv-chip)
    /pib_spic[0] (pnv-spi)
      /chip1.spi.0 (SSI)
      /xscom-spi[0] (memory-region)

Signed-off-by: Chalapathi V <chalapathi.v@linux.ibm.com>
Message-ID: <20250303141328.23991-4-chalapathi.v@linux.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

hw/ppc/pnv.c

@@ -2252,6 +2252,8 @@ static void pnv_chip_power10_realize(DeviceState *dev, Error **errp)
         /* pib_spic[2] connected to 25csm04 which implements 1 byte transfer */
         object_property_set_int(OBJECT(&chip10->pib_spic[i]), "transfer_len",
                                 (i == 2) ? 1 : 4, &error_fatal);
+        object_property_set_int(OBJECT(&chip10->pib_spic[i]), "chip-id",
+                                chip->chip_id, &error_fatal);
         if (!sysbus_realize(SYS_BUS_DEVICE(OBJECT
                                         (&chip10->pib_spic[i])), errp)) {
             return;

hw/ssi/pnv_spi.c

@@ -1147,14 +1147,15 @@ static const MemoryRegionOps pnv_spi_xscom_ops = {
 
 static const Property pnv_spi_properties[] = {
     DEFINE_PROP_UINT32("spic_num", PnvSpi, spic_num, 0),
+    DEFINE_PROP_UINT32("chip-id", PnvSpi, chip_id, 0),
     DEFINE_PROP_UINT8("transfer_len", PnvSpi, transfer_len, 4),
 };
 
 static void pnv_spi_realize(DeviceState *dev, Error **errp)
 {
     PnvSpi *s = PNV_SPI(dev);
-    g_autofree char *name = g_strdup_printf(TYPE_PNV_SPI_BUS ".%d",
-                    s->spic_num);
+    g_autofree char *name = g_strdup_printf("chip%d." TYPE_PNV_SPI_BUS ".%d",
+                    s->chip_id, s->spic_num);
     s->ssi_bus = ssi_create_bus(dev, name);
     s->cs_line = g_new0(qemu_irq, 1);
     qdev_init_gpio_out_named(DEVICE(s), s->cs_line, "cs", 1);

include/hw/ssi/pnv_spi.h

@@ -31,7 +31,7 @@ OBJECT_DECLARE_SIMPLE_TYPE(PnvSpi, PNV_SPI)
 #define PNV_SPI_REG_SIZE 8
 #define PNV_SPI_REGS 7
 
-#define TYPE_PNV_SPI_BUS "pnv-spi-bus"
+#define TYPE_PNV_SPI_BUS "spi"
 typedef struct PnvSpi {
     SysBusDevice parent_obj;
 
@@ -42,6 +42,7 @@ typedef struct PnvSpi {
     Fifo8 rx_fifo;
     /* SPI object number */
     uint32_t        spic_num;
+    uint32_t        chip_id;
     uint8_t         transfer_len;
     uint8_t         responder_select;
     /* To verify if shift_n1 happens prior to shift_n2 */

tests/qtest/pnv-spi-seeprom-test.c

@@ -92,7 +92,7 @@ static void test_spi_seeprom(const void *data)
     qts = qtest_initf("-machine powernv10 -smp 2,cores=2,"
                       "threads=1 -accel tcg,thread=single -nographic "
                       "-blockdev node-name=pib_spic2,driver=file,"
-                      "filename=%s -device 25csm04,bus=pnv-spi-bus.2,cs=0,"
+                      "filename=%s -device 25csm04,bus=chip0.spi.2,cs=0,"
                       "drive=pib_spic2", tmp_path);
     spi_seeprom_transaction(qts, chip);
     qtest_quit(qts);