diff --git a/CMakeLists.txt b/CMakeLists.txt
index d1cea21..fd2b210 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -67,12 +67,16 @@ dmod_add_library(${DMOD_MODULE_NAME} ${DMOD_MODULE_VERSION}
     src/dmspi.c
 )
 
+# dmgpio >= 1.1: its ioctl commands start at DMDRVI_IOCTL_CUSTOM_BASE -
+# dmgpio_ioctl_cmd_set_pins_state (chip select) has a different value than
+# in 1.0. Build-time only: dmspi reaches the GPIO through Dmod_Ioctl() on
+# its node, so the board image must carry dmgpio >= 1.1 as well.
 dmod_link_modules(${DMOD_MODULE_NAME}
-    dmdrvi
+    dmdrvi@>=2.0
     dmini
     dmhaman
     dm_sw_ring
-    dmgpio
+    dmgpio@>=1.1
 )
 
 target_include_directories(${DMOD_MODULE_NAME} PRIVATE
diff --git a/docs/api-reference.md b/docs/api-reference.md
index 38c50ab..d50a070 100644
--- a/docs/api-reference.md
+++ b/docs/api-reference.md
@@ -44,6 +44,13 @@ callable by name from another module (see [configuration.md](configuration.md)).
 | `dmdrvi_dmspi_read` | Receive bytes - drains the RX ring if configured, otherwise blocks clocking dummy bytes (master) or waiting for the external master (slave). |
 | `dmdrvi_dmspi_write` | Transmit bytes (full duplex at the wire level; received bytes are discarded). |
 | `dmdrvi_dmspi_ioctl` | Get/set configuration parameters, register an interrupt handler, run a full-duplex transfer, or reconfigure - see `dmspi_ioctl_cmd_t` in [include/dmspi_types.h](../include/dmspi_types.h). |
+
+`dmspi_ioctl_cmd_t` starts at `DMDRVI_IOCTL_CUSTOM_BASE` (0x1000, dmdrvi 2.0),
+the range dmdrvi reserves for driver-specific commands. Any other command -
+for example the class probes (`DMDRVI_IOCTL_BLOCK_GET_INFO`,
+`DMDRVI_IOCTL_MONITOR_GET_POLICY`) dmdevfs sends to every node - returns
+`-ENOTTY` without being logged. Before this numbering the commands started at 1;
+modules sending dmspi ioctls must be rebuilt.
 | `dmdrvi_dmspi_flush` | Block until any in-progress transfer completes. |
 | `dmdrvi_dmspi_stat` | Report device metadata. |
 
diff --git a/include/dmspi_types.h b/include/dmspi_types.h
index abdc5f3..2e92d47 100644
--- a/include/dmspi_types.h
+++ b/include/dmspi_types.h
@@ -4,6 +4,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <stddef.h>
+#include "dmdrvi_ioctl.h"
 
 /**
  * @brief SPI instance type (1-based, e.g. 1 = SPI1)
@@ -79,7 +80,10 @@ typedef enum
  */
 typedef enum
 {
-    dmspi_ioctl_cmd_get_role = 1,               /**< Get role (master/slave) */
+    /* Private commands start at DMDRVI_IOCTL_CUSTOM_BASE: everything below
+     * it is a standard dmdrvi command (network, block, monitor) that dmdevfs
+     * and other generic code may send to any node - dmspi answers -ENOTTY. */
+    dmspi_ioctl_cmd_get_role = DMDRVI_IOCTL_CUSTOM_BASE,   /**< Get role (master/slave) */
     dmspi_ioctl_cmd_set_role,                   /**< Set role (master/slave) */
     dmspi_ioctl_cmd_get_baudrate,               /**< Get requested baud rate */
     dmspi_ioctl_cmd_set_baudrate,               /**< Set requested baud rate */
diff --git a/src/dmspi.c b/src/dmspi.c
index fa6c256..9cf0d4a 100644
--- a/src/dmspi.c
+++ b/src/dmspi.c
@@ -682,10 +682,11 @@ dmod_dmdrvi_dif_api_declaration(2.0, dmspi, int, _ioctl, ( dmdrvi_context_t cont
         return -EINVAL;
     }
 
-    if (command >= dmspi_ioctl_cmd_max)
+    /* Not a dmspi command - e.g. the class probes dmdevfs sends to every
+     * node: not implemented, as dmdrvi requires, and not worth a log line. */
+    if (command < dmspi_ioctl_cmd_get_role || command >= dmspi_ioctl_cmd_max)
     {
-        DMOD_LOG_ERROR("Invalid ioctl command %d\n", command);
-        return -EINVAL;
+        return -ENOTTY;
     }
 
     if (command == dmspi_ioctl_cmd_reconfigure)
diff --git a/src/port/CMakeLists.txt b/src/port/CMakeLists.txt
index 1dde73b..b264dc2 100644
--- a/src/port/CMakeLists.txt
+++ b/src/port/CMakeLists.txt
@@ -37,10 +37,13 @@ dmod_add_library(${DMOD_MODULE_NAME} ${DMOD_MODULE_VERSION}
     ${COMMON_SOURCES}
 )
 
+# dmdrvi: headers only - dmspi_types.h numbers the ioctl commands from
+# DMDRVI_IOCTL_CUSTOM_BASE.
 dmod_link_modules(${DMOD_MODULE_NAME}
     dm_sw_ring
     dmclk_port
     dmosi
+    dmdrvi@>=2.0
 )
 
 target_include_directories(${DMOD_MODULE_NAME} BEFORE PRIVATE
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index fdbaa2e..30548c3 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -14,6 +14,13 @@ target_include_directories(${DMOD_MODULE_NAME} PRIVATE
 
 target_link_libraries(${DMOD_MODULE_NAME} dmspi_if)
 
+# dmdrvi: the DIF the ioctl test calls dmspi through (like dmdevfs); dmini:
+# its configuration.
+dmod_link_modules(${DMOD_MODULE_NAME}
+    dmdrvi@>=2.0
+    dmini
+)
+
 # Register the test module with ctest - this replays the same two steps CI
 # runs (see .github/templates/ci.yml.template): install the test module's
 # dependencies with dmf-get, then execute it through dmod_loader. The test's
diff --git a/tests/dmspi_test.c b/tests/dmspi_test.c
index 946afca..5ac3e07 100644
--- a/tests/dmspi_test.c
+++ b/tests/dmspi_test.c
@@ -1,6 +1,10 @@
 #define DMOD_ENABLE_REGISTRATION ON
+#define ENABLE_DIF_REGISTRATIONS ON
 #include "dmod_test.h"
 #include "dmspi.h"
+#include "dmdrvi.h"
+#include "dmini.h"
+#include <errno.h>
 #include <string.h>
 
 static dmspi_config_t g_config;
@@ -45,3 +49,71 @@ DMOD_TEST_STEP(dmspi_validate_config_rejects_null)
 {
     DMOD_TEST_EXPECT_FALSE(dmspi_validate_config(NULL));
 }
+
+/* ---- ioctl numbering, through the dmdrvi DIF the way dmdevfs calls it ---- */
+
+typedef struct
+{
+    dmod_dmdrvi_create_t    create;
+    dmod_dmdrvi_free_t      free;
+    dmod_dmdrvi_open_t      open;
+    dmod_dmdrvi_close_t     close;
+    dmod_dmdrvi_ioctl_t     ioctl;
+} driver_t;
+
+static bool get_driver(driver_t* drv)
+{
+    Dmod_Context_t* module = Dmod_GetModuleContext("dmspi");
+    if (module == NULL)
+    {
+        return false;
+    }
+    drv->create = Dmod_GetDifFunction(module, dmod_dmdrvi_create_sig);
+    drv->free   = Dmod_GetDifFunction(module, dmod_dmdrvi_free_sig);
+    drv->open   = Dmod_GetDifFunction(module, dmod_dmdrvi_open_sig);
+    drv->close  = Dmod_GetDifFunction(module, dmod_dmdrvi_close_sig);
+    drv->ioctl  = Dmod_GetDifFunction(module, dmod_dmdrvi_ioctl_sig);
+    return drv->create != NULL && drv->free != NULL && drv->open != NULL &&
+           drv->close != NULL && drv->ioctl != NULL;
+}
+
+DMOD_TEST_STEP(dmspi_ioctl_answers_only_its_own_command_range)
+{
+    driver_t drv = { 0 };
+    DMOD_TEST_EXPECT_TRUE(get_driver(&drv));
+    if (drv.ioctl == NULL)
+    {
+        return;
+    }
+    dmini_context_t ini = dmini_create();
+    dmini_parse_string(ini, "[dmspi]\ninstance=1\nrole=master\nbaudrate=1000000\nmode=0\n");
+    dmdrvi_dev_num_t dev_num = { 0 };
+    dmdrvi_context_t ctx = drv.create(ini, &dev_num);
+    DMOD_TEST_EXPECT_NOT_NULL(ctx);
+    void* handle = (ctx != NULL) ? drv.open(ctx, DMDRVI_O_RDWR, &dev_num) : NULL;
+    DMOD_TEST_EXPECT_NOT_NULL(handle);
+    if (handle != NULL)
+    {
+        dmspi_role_t role = dmspi_role_slave;
+        uint32_t probe[16] = { 0 };
+
+        /* Standard dmdrvi commands - dmdevfs sends the first two to every node. */
+        DMOD_TEST_EXPECT_EQ(drv.ioctl(ctx, handle, DMDRVI_IOCTL_BLOCK_GET_INFO, probe), -ENOTTY);
+        DMOD_TEST_EXPECT_EQ(drv.ioctl(ctx, handle, DMDRVI_IOCTL_MONITOR_GET_POLICY, probe), -ENOTTY);
+        DMOD_TEST_EXPECT_EQ(drv.ioctl(ctx, handle, DMDRVI_IOCTL_NET_GET_MAC_ADDR, probe), -ENOTTY);
+        DMOD_TEST_EXPECT_EQ(drv.ioctl(ctx, handle, 0, probe), -ENOTTY);
+        DMOD_TEST_EXPECT_EQ(drv.ioctl(ctx, handle, -1, probe), -ENOTTY);
+        DMOD_TEST_EXPECT_EQ(drv.ioctl(ctx, handle, dmspi_ioctl_cmd_max, probe), -ENOTTY);
+
+        /* dmspi's own commands, from DMDRVI_IOCTL_CUSTOM_BASE. */
+        DMOD_TEST_EXPECT_EQ((int)dmspi_ioctl_cmd_get_role, DMDRVI_IOCTL_CUSTOM_BASE);
+        DMOD_TEST_EXPECT_EQ(drv.ioctl(ctx, handle, dmspi_ioctl_cmd_get_role, &role), 0);
+        DMOD_TEST_EXPECT_EQ(role, dmspi_role_master);
+        drv.close(ctx, handle);
+    }
+    if (ctx != NULL)
+    {
+        drv.free(ctx);
+    }
+    dmini_destroy(ini);
+}
diff --git a/tools/spitest/CMakeLists.txt b/tools/spitest/CMakeLists.txt
index baa6a5f..ac86316 100644
--- a/tools/spitest/CMakeLists.txt
+++ b/tools/spitest/CMakeLists.txt
@@ -25,9 +25,11 @@ dmod_add_executable(spitest ${DMOD_MODULE_VERSION}
 # dmosi is a separate module - fetch its headers for the worker thread
 # used by the loopback test. The real implementation is resolved at
 # runtime against the system's own instance, same as dmtty/tools/tty's
-# dmtty_attach() - no static linkage.
+# dmtty_attach() - no static linkage. dmdrvi: headers only, for
+# DMDRVI_IOCTL_CUSTOM_BASE (the base of dmspi_ioctl_cmd_t).
 dmod_link_modules(spitest
     dmosi
+    dmdrvi@>=2.0
 )
 
 # dmspi_types.h lives in this same repo (no dmf-get fetch needed) - it only