[PATCH 0/8] Misc NPCM7XX patches

[PATCH 0/8] Misc NPCM7XX patches

[Hao Wu]

[NOTE: I'm reviving a bunch of patches that was in the process of
upstreaming a while ago but paused.]

This patch set contains a few bug fixes and I2C devices for some
NPCM7XX boards.

Patch 1~2 fix a problem that causes the SMBus module to behave
incorrectly when it's in FIFO mode and trying to receive more than
16 bytes at a time.

Patch 3 fixes a error in a register for ADC module.

Patch 4 makes the ADC input to be R/W instead of write only. It allows
a test system to read these via QMP and has no negative effect.

Patch 5 adds a new blockdev IF type IF_OTHER.

Patch 6 allows at24c_eeprom_init to take a bus as parameter so it can
be used by more use cases (e.g. behind an I2C mux.)

Patch 7 allows at24c_eeprom_init to take a drive as property, similar
to sdhci_attach_device().

Patch 8 uses the function defined in patch 5 to add the EEPROM and other
I2C devices for Quanta GBS board.

-- Changes since v4:
1. Add comments to patch 5.
2. Split patch 6 into 2 patches according to the feedback.  Each patch does it own task.

-- Changes since v3:
1. Add a new blockdev IF type IF_OTHER.
2. Use IF_OTHER instead of IF_NONE.

-- Changes since v2:
1. Dropped patch 7.
2. Drop an extra variable in patch 5.

-- Changes since v1:
1. Rewrote patch 5 to implement the function in NPCM7xx board file instead
   of the EEPROM device file.
2. Slightly modify patch 6 to adapt to the changes and QEMU comment style.
3. Squash patch 7 into patch 5 to make it compile.
4. Add a new patch 7.

Hao Wu (7):
  hw/i2c: Clear ACK bit in NPCM7xx SMBus module
  hw/i2c: Read FIFO during RXF_CTL change in NPCM7XX SMBus
  hw/adc: Fix CONV bit in NPCM7XX ADC CON register
  hw/adc: Make adci[*] R/W in NPCM7XX ADC
  blockdev: Add a new IF type IF_OTHER
  hw/arm: npcm8xx_boards: EEPROMs can take bus as parameter
  hw/arm: Set drive property for at24c eeprom

Patrick Venture (1):
  hw/arm: quanta-gbs-bmc add i2c devices

 blockdev.c                     |   4 +-
 hw/adc/npcm7xx_adc.c           |   4 +-
 hw/arm/npcm7xx_boards.c        | 102 ++++++++++++++++++++-------------
 hw/i2c/npcm7xx_smbus.c         |   8 +--
 include/sysemu/blockdev.h      |   1 +
 tests/qtest/npcm7xx_adc-test.c |   2 +-
 6 files changed, 73 insertions(+), 48 deletions(-)

-- 
2.37.0.170.g444d1eabd0-goog

[PATCH 1/8] hw/i2c: Clear ACK bit in NPCM7xx SMBus module

[Hao Wu]

The ACK bit in NPCM7XX SMBus module should be cleared each time it
sends out a NACK signal. This patch fixes the bug that it fails to
do so.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Titus Rwantare <titusr@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/i2c/npcm7xx_smbus.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/i2c/npcm7xx_smbus.c b/hw/i2c/npcm7xx_smbus.c
index e7e0ba66fe..f18e311556 100644
--- a/hw/i2c/npcm7xx_smbus.c
+++ b/hw/i2c/npcm7xx_smbus.c
@@ -270,7 +270,7 @@ static void npcm7xx_smbus_recv_byte(NPCM7xxSMBusState *s)
     if (s->st & NPCM7XX_SMBCTL1_ACK) {
         trace_npcm7xx_smbus_nack(DEVICE(s)->canonical_path);
         i2c_nack(s->bus);
-        s->st &= NPCM7XX_SMBCTL1_ACK;
+        s->st &= ~NPCM7XX_SMBCTL1_ACK;
     }
     trace_npcm7xx_smbus_recv_byte((DEVICE(s)->canonical_path), s->sda);
     npcm7xx_smbus_update_irq(s);
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH 2/8] hw/i2c: Read FIFO during RXF_CTL change in NPCM7XX SMBus

[Hao Wu]

Originally we read in from SMBus when RXF_STS is cleared. However,
the driver clears RXF_STS before setting RXF_CTL, causing the SM bus
module to read incorrect amount of bytes in FIFO mode when the number
of bytes read changed. This patch fixes this issue.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Titus Rwantare <titusr@google.com>
Acked-by: Corey Minyard <cminyard@mvista.com>
---
 hw/i2c/npcm7xx_smbus.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/hw/i2c/npcm7xx_smbus.c b/hw/i2c/npcm7xx_smbus.c
index f18e311556..1435daea94 100644
--- a/hw/i2c/npcm7xx_smbus.c
+++ b/hw/i2c/npcm7xx_smbus.c
@@ -637,9 +637,6 @@ static void npcm7xx_smbus_write_rxf_sts(NPCM7xxSMBusState *s, uint8_t value)
 {
     if (value & NPCM7XX_SMBRXF_STS_RX_THST) {
         s->rxf_sts &= ~NPCM7XX_SMBRXF_STS_RX_THST;
-        if (s->status == NPCM7XX_SMBUS_STATUS_RECEIVING) {
-            npcm7xx_smbus_recv_fifo(s);
-        }
     }
 }
 
@@ -651,6 +648,9 @@ static void npcm7xx_smbus_write_rxf_ctl(NPCM7xxSMBusState *s, uint8_t value)
         new_ctl = KEEP_OLD_BIT(s->rxf_ctl, new_ctl, NPCM7XX_SMBRXF_CTL_LAST);
     }
     s->rxf_ctl = new_ctl;
+    if (s->status == NPCM7XX_SMBUS_STATUS_RECEIVING) {
+        npcm7xx_smbus_recv_fifo(s);
+    }
 }
 
 static uint64_t npcm7xx_smbus_read(void *opaque, hwaddr offset, unsigned size)
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH 3/8] hw/adc: Fix CONV bit in NPCM7XX ADC CON register

[Hao Wu]

The correct bit for the CONV bit in NPCM7XX ADC is bit 13. This patch
fixes that in the module, and also lower the IRQ when the guest
is done handling an interrupt event from the ADC module.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Patrick Venture<venture@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/adc/npcm7xx_adc.c           | 2 +-
 tests/qtest/npcm7xx_adc-test.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/adc/npcm7xx_adc.c b/hw/adc/npcm7xx_adc.c
index 0f0a9f63e2..47fb9e5f74 100644
--- a/hw/adc/npcm7xx_adc.c
+++ b/hw/adc/npcm7xx_adc.c
@@ -36,7 +36,7 @@ REG32(NPCM7XX_ADC_DATA, 0x4)
 #define NPCM7XX_ADC_CON_INT     BIT(18)
 #define NPCM7XX_ADC_CON_EN      BIT(17)
 #define NPCM7XX_ADC_CON_RST     BIT(16)
-#define NPCM7XX_ADC_CON_CONV    BIT(14)
+#define NPCM7XX_ADC_CON_CONV    BIT(13)
 #define NPCM7XX_ADC_CON_DIV(rv) extract32(rv, 1, 8)
 
 #define NPCM7XX_ADC_MAX_RESULT      1023
diff --git a/tests/qtest/npcm7xx_adc-test.c b/tests/qtest/npcm7xx_adc-test.c
index 3fa6d9ece0..8048044d28 100644
--- a/tests/qtest/npcm7xx_adc-test.c
+++ b/tests/qtest/npcm7xx_adc-test.c
@@ -50,7 +50,7 @@
 #define CON_INT     BIT(18)
 #define CON_EN      BIT(17)
 #define CON_RST     BIT(16)
-#define CON_CONV    BIT(14)
+#define CON_CONV    BIT(13)
 #define CON_DIV(rv) extract32(rv, 1, 8)
 
 #define FST_RDST    BIT(1)
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH 4/8] hw/adc: Make adci[*] R/W in NPCM7XX ADC

[Hao Wu]

Our sensor test requires both reading and writing from a sensor's
QOM property. So we need to make the input of ADC module R/W instead
of write only for that to work.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Titus Rwantare <titusr@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
---
 hw/adc/npcm7xx_adc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/adc/npcm7xx_adc.c b/hw/adc/npcm7xx_adc.c
index 47fb9e5f74..bc6f3f55e6 100644
--- a/hw/adc/npcm7xx_adc.c
+++ b/hw/adc/npcm7xx_adc.c
@@ -242,7 +242,7 @@ static void npcm7xx_adc_init(Object *obj)
 
     for (i = 0; i < NPCM7XX_ADC_NUM_INPUTS; ++i) {
         object_property_add_uint32_ptr(obj, "adci[*]",
-                &s->adci[i], OBJ_PROP_FLAG_WRITE);
+                &s->adci[i], OBJ_PROP_FLAG_READWRITE);
     }
     object_property_add_uint32_ptr(obj, "vref",
             &s->vref, OBJ_PROP_FLAG_WRITE);
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH 5/8] blockdev: Add a new IF type IF_OTHER

[Hao Wu]

This type is used to represent block devs that are not suitable to
be represented by other existing types.

A sample use is to represent an at24c eeprom device defined in
hw/nvram/eeprom_at24c.c. The block device can be used to contain the
content of the said eeprom device.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
---
 blockdev.c                | 4 +++-
 include/sysemu/blockdev.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/blockdev.c b/blockdev.c
index 9230888e34..befd69ac5f 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -82,6 +82,7 @@ static const char *const if_name[IF_COUNT] = {
     [IF_MTD] = "mtd",
     [IF_SD] = "sd",
     [IF_VIRTIO] = "virtio",
+    [IF_OTHER] = "other",
     [IF_XEN] = "xen",
 };
 
@@ -726,7 +727,8 @@ QemuOptsList qemu_legacy_drive_opts = {
         },{
             .name = "if",
             .type = QEMU_OPT_STRING,
-            .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
+            .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio,"
+                    " other)",
         },{
             .name = "file",
             .type = QEMU_OPT_STRING,
diff --git a/include/sysemu/blockdev.h b/include/sysemu/blockdev.h
index 3211b16513..d9dd5af291 100644
--- a/include/sysemu/blockdev.h
+++ b/include/sysemu/blockdev.h
@@ -21,6 +21,7 @@ typedef enum {
      */
     IF_NONE = 0,
     IF_IDE, IF_SCSI, IF_FLOPPY, IF_PFLASH, IF_MTD, IF_SD, IF_VIRTIO, IF_XEN,
+    IF_OTHER,
     IF_COUNT
 } BlockInterfaceType;
 
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH 6/8] hw/arm: npcm8xx_boards: EEPROMs can take bus as parameter

[Hao Wu]

We allow at24c_eeprom_init to take a I2CBus* as parameter. This allows
us to attach an EEPROM device behind an I2C mux which is not
possible with the old method.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
---
 hw/arm/npcm7xx_boards.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/hw/arm/npcm7xx_boards.c b/hw/arm/npcm7xx_boards.c
index 6bc6f5d2fe..b083b0c572 100644
--- a/hw/arm/npcm7xx_boards.c
+++ b/hw/arm/npcm7xx_boards.c
@@ -140,10 +140,9 @@ static I2CBus *npcm7xx_i2c_get_bus(NPCM7xxState *soc, uint32_t num)
     return I2C_BUS(qdev_get_child_bus(DEVICE(&soc->smbus[num]), "i2c-bus"));
 }
 
-static void at24c_eeprom_init(NPCM7xxState *soc, int bus, uint8_t addr,
+static void at24c_eeprom_init(I2CBus *i2c_bus, int bus, uint8_t addr,
                               uint32_t rsize)
 {
-    I2CBus *i2c_bus = npcm7xx_i2c_get_bus(soc, bus);
     I2CSlave *i2c_dev = i2c_slave_new("at24c-eeprom", addr);
     DeviceState *dev = DEVICE(i2c_dev);
 
@@ -253,8 +252,8 @@ static void quanta_gsj_i2c_init(NPCM7xxState *soc)
     i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 3), "tmp105", 0x5c);
     i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 4), "tmp105", 0x5c);
 
-    at24c_eeprom_init(soc, 9, 0x55, 8192);
-    at24c_eeprom_init(soc, 10, 0x55, 8192);
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 9), 9, 0x55, 8192);
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 10), 10, 0x55, 8192);
 
     /*
      * i2c-11:
@@ -360,7 +359,8 @@ static void kudo_bmc_i2c_init(NPCM7xxState *soc)
 
     i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 4), TYPE_PCA9548, 0x77);
 
-    at24c_eeprom_init(soc, 4, 0x50, 8192); /* mbfru */
+    /* mbfru */
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 4), 4, 0x50, 8192);
 
     i2c_mux = i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 13),
                                       TYPE_PCA9548, 0x77);
@@ -371,7 +371,8 @@ static void kudo_bmc_i2c_init(NPCM7xxState *soc)
     i2c_slave_create_simple(pca954x_i2c_get_bus(i2c_mux, 4), "tmp105", 0x48);
     i2c_slave_create_simple(pca954x_i2c_get_bus(i2c_mux, 5), "tmp105", 0x49);
 
-    at24c_eeprom_init(soc, 14, 0x55, 8192); /* bmcfru */
+    /* bmcfru */
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 14), 14, 0x55, 8192);
 
     /* TODO: Add remaining i2c devices. */
 }
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH 7/8] hw/arm: Set drive property for at24c eeprom

[Hao Wu]

This patch allows the user to attach an external drive as a property
for an onboard at24c eeprom device. It uses an unit number to
distinguish different devices.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
---
 hw/arm/npcm7xx_boards.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/hw/arm/npcm7xx_boards.c b/hw/arm/npcm7xx_boards.c
index b083b0c572..b8337871ba 100644
--- a/hw/arm/npcm7xx_boards.c
+++ b/hw/arm/npcm7xx_boards.c
@@ -141,11 +141,16 @@ static I2CBus *npcm7xx_i2c_get_bus(NPCM7xxState *soc, uint32_t num)
 }
 
 static void at24c_eeprom_init(I2CBus *i2c_bus, int bus, uint8_t addr,
-                              uint32_t rsize)
+                              uint32_t rsize, int unit)
 {
     I2CSlave *i2c_dev = i2c_slave_new("at24c-eeprom", addr);
     DeviceState *dev = DEVICE(i2c_dev);
+    DriveInfo *dinfo;
 
+    dinfo = drive_get(IF_OTHER, bus, unit);
+    if (dinfo) {
+        qdev_prop_set_drive(dev, "drive", blk_by_legacy_dinfo(dinfo));
+    }
     qdev_prop_set_uint32(dev, "rom-size", rsize);
     i2c_slave_realize_and_unref(i2c_dev, i2c_bus, &error_abort);
 }
@@ -252,8 +257,8 @@ static void quanta_gsj_i2c_init(NPCM7xxState *soc)
     i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 3), "tmp105", 0x5c);
     i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 4), "tmp105", 0x5c);
 
-    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 9), 9, 0x55, 8192);
-    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 10), 10, 0x55, 8192);
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 9), 9, 0x55, 8192, 0);
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 10), 10, 0x55, 8192, 1);
 
     /*
      * i2c-11:
@@ -360,7 +365,7 @@ static void kudo_bmc_i2c_init(NPCM7xxState *soc)
     i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 4), TYPE_PCA9548, 0x77);
 
     /* mbfru */
-    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 4), 4, 0x50, 8192);
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 4), 4, 0x50, 8192, 0);
 
     i2c_mux = i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 13),
                                       TYPE_PCA9548, 0x77);
@@ -372,7 +377,7 @@ static void kudo_bmc_i2c_init(NPCM7xxState *soc)
     i2c_slave_create_simple(pca954x_i2c_get_bus(i2c_mux, 5), "tmp105", 0x49);
 
     /* bmcfru */
-    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 14), 14, 0x55, 8192);
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 14), 14, 0x55, 8192, 1);
 
     /* TODO: Add remaining i2c devices. */
 }
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH 8/8] hw/arm: quanta-gbs-bmc add i2c devices

[Hao Wu]

From: Patrick Venture <venture@google.com>

Adds supported i2c devices to the quanta-gbc-bmc board.

Signed-off-by: Patrick Venture <venture@google.com>
Reviewed-by: Hao Wu <wuhaotsh@google.com>
---
 hw/arm/npcm7xx_boards.c | 82 ++++++++++++++++++++++++-----------------
 1 file changed, 49 insertions(+), 33 deletions(-)

diff --git a/hw/arm/npcm7xx_boards.c b/hw/arm/npcm7xx_boards.c
index b8337871ba..4bae5589f0 100644
--- a/hw/arm/npcm7xx_boards.c
+++ b/hw/arm/npcm7xx_boards.c
@@ -290,10 +290,12 @@ static void quanta_gsj_fan_init(NPCM7xxMachine *machine, NPCM7xxState *soc)
 
 static void quanta_gbs_i2c_init(NPCM7xxState *soc)
 {
+    I2CSlave *i2c_mux;
+
+    /* i2c-0: */
+    i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 0), TYPE_PCA9546, 0x71);
+
     /*
-     * i2c-0:
-     *     pca9546@71
-     *
      * i2c-1:
      *     pca9535@24
      *     pca9535@20
@@ -302,46 +304,60 @@ static void quanta_gbs_i2c_init(NPCM7xxState *soc)
      *     pca9535@23
      *     pca9535@25
      *     pca9535@26
-     *
-     * i2c-2:
-     *     sbtsi@4c
-     *
-     * i2c-5:
-     *     atmel,24c64@50 mb_fru
-     *     pca9546@71
-     *         - channel 0: max31725@54
-     *         - channel 1: max31725@55
-     *         - channel 2: max31725@5d
-     *                      atmel,24c64@51 fan_fru
-     *         - channel 3: atmel,24c64@52 hsbp_fru
-     *
+     */
+
+    /* i2c-2: sbtsi@4c */
+
+    /* i2c-5: */
+    /* mb_fru */
+    at24c_eeprom_init(npcm7xx_i2c_get_bus(soc, 5), 5, 0x50, 8192, 0);
+    i2c_mux = i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 5),
+                                      TYPE_PCA9546, 0x71);
+    /* max31725 is tmp105 compatible. */
+    i2c_slave_create_simple(pca954x_i2c_get_bus(i2c_mux, 0), "tmp105", 0x54);
+    i2c_slave_create_simple(pca954x_i2c_get_bus(i2c_mux, 1), "tmp105", 0x55);
+    i2c_slave_create_simple(pca954x_i2c_get_bus(i2c_mux, 2), "tmp105", 0x5d);
+    /* fan_fru */
+    at24c_eeprom_init(pca954x_i2c_get_bus(i2c_mux, 2), 5, 0x51, 8192, 1);
+    /* hsbp_fru */
+    at24c_eeprom_init(pca954x_i2c_get_bus(i2c_mux, 3), 5, 0x52, 8192, 2);
+
+    /*
      * i2c-6:
      *     pca9545@73
      *
      * i2c-7:
      *     pca9545@72
-     *
-     * i2c-8:
-     *     adi,adm1272@10
-     *
-     * i2c-9:
-     *     pca9546@71
-     *         - channel 0: isil,isl68137@60
-     *         - channel 1: isil,isl68137@61
-     *         - channel 2: isil,isl68137@63
-     *         - channel 3: isil,isl68137@45
-     *
+     */
+
+    /* i2c-8: */
+    i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 8), "adm1272", 0x10);
+
+    /* i2c-9: */
+    i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 9), TYPE_PCA9546, 0x71);
+    /*
+     * - channel 0: isil,isl68137@60
+     * - channel 1: isil,isl68137@61
+     * - channel 2: isil,isl68137@63
+     * - channel 3: isil,isl68137@45
+     */
+
+    /*
      * i2c-10:
      *     pca9545@71
      *
      * i2c-11:
      *     pca9545@76
-     *
-     * i2c-12:
-     *     maxim,max34451@4e
-     *     isil,isl68137@5d
-     *     isil,isl68137@5e
-     *
+     */
+
+    /* i2c-12: */
+    i2c_slave_create_simple(npcm7xx_i2c_get_bus(soc, 12), "max34451", 0x4e);
+    /*
+     * isil,isl68137@5d
+     * isil,isl68137@5e
+     */
+
+    /*
      * i2c-14:
      *     pca9545@70
      */
-- 
2.37.0.170.g444d1eabd0-goog

[PATCH 5/8] blockdev: Add a new IF type IF_OTHER

[Hao Wu]

This type is used to represent block devs that are not suitable to
be represented by other existing types.

A sample use is to represent an at24c eeprom device defined in
hw/nvram/eeprom_at24c.c. The block device can be used to contain the
content of the said eeprom device.

Signed-off-by: Hao Wu <wuhaotsh@google.com>
---
 blockdev.c                | 4 +++-
 include/sysemu/blockdev.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/blockdev.c b/blockdev.c
index 9230888e34..befd69ac5f 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -82,6 +82,7 @@ static const char *const if_name[IF_COUNT] = {
     [IF_MTD] = "mtd",
     [IF_SD] = "sd",
     [IF_VIRTIO] = "virtio",
+    [IF_OTHER] = "other",
     [IF_XEN] = "xen",
 };
 
@@ -726,7 +727,8 @@ QemuOptsList qemu_legacy_drive_opts = {
         },{
             .name = "if",
             .type = QEMU_OPT_STRING,
-            .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio)",
+            .help = "interface (ide, scsi, sd, mtd, floppy, pflash, virtio,"
+                    " other)",
         },{
             .name = "file",
             .type = QEMU_OPT_STRING,
diff --git a/include/sysemu/blockdev.h b/include/sysemu/blockdev.h
index 3211b16513..d9dd5af291 100644
--- a/include/sysemu/blockdev.h
+++ b/include/sysemu/blockdev.h
@@ -21,6 +21,7 @@ typedef enum {
      */
     IF_NONE = 0,
     IF_IDE, IF_SCSI, IF_FLOPPY, IF_PFLASH, IF_MTD, IF_SD, IF_VIRTIO, IF_XEN,
+    IF_OTHER,
     IF_COUNT
 } BlockInterfaceType;
 
-- 
2.37.0.170.g444d1eabd0-goog