fsl-imx6: Add SNVS support for i.MX6 boards

SNVS is supported on both i.MX6 and i.MX6UL and is needed
to support shutdown on the board.

Cc: Peter Maydell <peter.maydell@linaro.org> (odd fixer:SABRELITE / i.MX6)
Cc: Jean-Christophe Dubois <jcd@tribudubois.net> (reviewer:SABRELITE / i.MX6)
Cc: qemu-arm@nongnu.org (open list:SABRELITE / i.MX6)
Cc: qemu-devel@nongnu.org (open list:All patches CC here)
Signed-off-by: Vitaly Cheptsov <cheptsov@ispras.ru>
Message-id: 20230515095015.66860-1-cheptsov@ispras.ru
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/arm/fsl-imx6.c

@@ -53,6 +53,8 @@ static void fsl_imx6_init(Object *obj)
 
     object_initialize_child(obj, "src", &s->src, TYPE_IMX6_SRC);
 
+    object_initialize_child(obj, "snvs", &s->snvs, TYPE_IMX7_SNVS);
+
     for (i = 0; i < FSL_IMX6_NUM_UARTS; i++) {
         snprintf(name, NAME_SIZE, "uart%d", i + 1);
         object_initialize_child(obj, name, &s->uart[i], TYPE_IMX_SERIAL);
@@ -390,6 +392,12 @@ static void fsl_imx6_realize(DeviceState *dev, Error **errp)
                        qdev_get_gpio_in(DEVICE(&s->a9mpcore),
                                         FSL_IMX6_ENET_MAC_1588_IRQ));
 
+    /*
+     * SNVS
+     */
+    sysbus_realize(SYS_BUS_DEVICE(&s->snvs), &error_abort);
+    sysbus_mmio_map(SYS_BUS_DEVICE(&s->snvs), 0, FSL_IMX6_SNVSHP_ADDR);
+
     /*
      * Watchdog
      */

include/hw/arm/fsl-imx6.h

@@ -21,6 +21,7 @@
 #include "hw/cpu/a9mpcore.h"
 #include "hw/misc/imx6_ccm.h"
 #include "hw/misc/imx6_src.h"
+#include "hw/misc/imx7_snvs.h"
 #include "hw/watchdog/wdt_imx2.h"
 #include "hw/char/imx_serial.h"
 #include "hw/timer/imx_gpt.h"
@@ -59,6 +60,7 @@ struct FslIMX6State {
     A9MPPrivState  a9mpcore;
     IMX6CCMState   ccm;
     IMX6SRCState   src;
+    IMX7SNVSState  snvs;
     IMXSerialState uart[FSL_IMX6_NUM_UARTS];
     IMXGPTState    gpt;
     IMXEPITState   epit[FSL_IMX6_NUM_EPITS];