diff --git a/drivers/analog/lmp92001.c b/drivers/analog/lmp92001.c
index 026d60fad3..6e75a32e63 100644
--- a/drivers/analog/lmp92001.c
+++ b/drivers/analog/lmp92001.c
@@ -255,7 +255,7 @@ static int lmp92001_gpio_readpin(FAR struct ioexpander_dev_s *dev,
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int lmp92001_gpio_multiwritepin(FAR struct ioexpander_dev_s *dev,
                                        FAR const uint8_t *pins,
-                                       FAR bool *values, int count);
+                                       FAR const bool *values, int count);
 static int lmp92001_gpio_multireadpin(FAR struct ioexpander_dev_s *dev,
                                       FAR const uint8_t *pins,
                                       FAR bool *values, int count);
@@ -1376,7 +1376,7 @@ static int lmp92001_gpio_readpin(FAR struct ioexpander_dev_s *dev,
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int lmp92001_gpio_multiwritepin(FAR struct ioexpander_dev_s *dev,
                                        FAR const uint8_t *pins,
-                                       FAR bool *values, int count)
+                                       FAR const bool *values, int count)
 {
 }
 
diff --git a/drivers/ioexpander/ioe_dummy.c b/drivers/ioexpander/ioe_dummy.c
index bd2af0de6a..fb2b4a356b 100644
--- a/drivers/ioexpander/ioe_dummy.c
+++ b/drivers/ioexpander/ioe_dummy.c
@@ -119,7 +119,7 @@ static int ioe_dummy_readpin(FAR struct ioexpander_dev_s *dev,
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int ioe_dummy_multiwritepin(FAR struct ioexpander_dev_s *dev,
                                    FAR const uint8_t *pins,
-                                   FAR bool *values, int count);
+                                   FAR const bool *values, int count);
 static int ioe_dummy_multireadpin(FAR struct ioexpander_dev_s *dev,
                                   FAR const uint8_t *pins,
                                   FAR bool *values, int count);
@@ -442,7 +442,7 @@ static int ioe_dummy_readpin(FAR struct ioexpander_dev_s *dev,
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int ioe_dummy_multiwritepin(FAR struct ioexpander_dev_s *dev,
                                    FAR const uint8_t *pins,
-                                   FAR bool *values, int count)
+                                   FAR const bool *values, int count)
 {
   FAR struct ioe_dummy_dev_s *priv = (FAR struct ioe_dummy_dev_s *)dev;
   uint8_t pin;
diff --git a/drivers/ioexpander/iso1h812g.c b/drivers/ioexpander/iso1h812g.c
index 93a0e3f031..36d15234ee 100644
--- a/drivers/ioexpander/iso1h812g.c
+++ b/drivers/ioexpander/iso1h812g.c
@@ -81,7 +81,7 @@ static int iso1h812g_readpin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
              FAR bool *value);
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int iso1h812g_multiwritepin(FAR struct ioexpander_dev_s *dev,
-             FAR const uint8_t *pins, FAR bool *values, int count);
+             FAR const uint8_t *pins, FAR const bool *values, int count);
 static int iso1h812g_multireadpin(FAR struct ioexpander_dev_s *dev,
              FAR const uint8_t *pins, FAR bool *values, int count);
 #endif
@@ -336,8 +336,8 @@ static int iso1h812g_readpin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
 
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int iso1h812g_multiwritepin(FAR struct ioexpander_dev_s *dev,
-                                   FAR const uint8_t *pins, FAR bool *values,
-                                   int count)
+                                   FAR const uint8_t *pins,
+                                   FAR const bool *values, int count)
 {
   FAR struct iso1h812g_dev_s *priv = (FAR struct iso1h812g_dev_s *)dev;
   int ret;
diff --git a/drivers/ioexpander/iso1i813t.c b/drivers/ioexpander/iso1i813t.c
index 348d1d8020..144f35cdbf 100644
--- a/drivers/ioexpander/iso1i813t.c
+++ b/drivers/ioexpander/iso1i813t.c
@@ -80,7 +80,7 @@ static int iso1i813t_readpin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
              FAR bool *value);
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int iso1i813t_multiwritepin(FAR struct ioexpander_dev_s *dev,
-             FAR const uint8_t *pins, FAR bool *values, int count);
+             FAR const uint8_t *pins, FAR const bool *values, int count);
 static int iso1i813t_multireadpin(FAR struct ioexpander_dev_s *dev,
              FAR const uint8_t *pins, FAR bool *values, int count);
 #endif
@@ -349,8 +349,8 @@ static int iso1i813t_readpin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
 
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int iso1i813t_multiwritepin(FAR struct ioexpander_dev_s *dev,
-                                   FAR const uint8_t *pins, FAR bool *values,
-                                   int count)
+                                   FAR const uint8_t *pins,
+                                   FAR const bool *values, int count)
 {
   gpiowarn("WARNING: ISO1I813T is only input expander!\n");
 
diff --git a/drivers/ioexpander/mcp23x08.c b/drivers/ioexpander/mcp23x08.c
index 730a1faf6a..bea149d044 100644
--- a/drivers/ioexpander/mcp23x08.c
+++ b/drivers/ioexpander/mcp23x08.c
@@ -74,7 +74,7 @@ static int mcp23x08_readbuf(FAR struct ioexpander_dev_s *dev, uint8_t pin,
              FAR bool *value);
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int mcp23x08_multiwritepin(FAR struct ioexpander_dev_s *dev,
-             FAR const uint8_t *pins, FAR bool *values, int count);
+             FAR const uint8_t *pins, FAR const bool *values, int count);
 static int mcp23x08_multireadpin(FAR struct ioexpander_dev_s *dev,
              FAR const uint8_t *pins, FAR bool *values, int count);
 static int mcp23x08_multireadbuf(FAR struct ioexpander_dev_s *dev,
@@ -562,7 +562,7 @@ static int mcp23x08_getmultibits(FAR struct mcp23x08_dev_s *priv,
 
 static int mcp23x08_multiwritepin(FAR struct ioexpander_dev_s *dev,
                                   FAR const uint8_t *pins,
-                                  FAR bool *values, int count)
+                                  FAR const bool *values, int count)
 {
   FAR struct mcp23x08_dev_s *priv = (FAR struct mcp23x08_dev_s *)dev;
   uint8_t addr = MCP23X08_GPIOA;
diff --git a/drivers/ioexpander/mcp23x17.c b/drivers/ioexpander/mcp23x17.c
index 418175ce2d..d3175a1670 100644
--- a/drivers/ioexpander/mcp23x17.c
+++ b/drivers/ioexpander/mcp23x17.c
@@ -74,7 +74,7 @@ static int mcp23x17_readbuf(FAR struct ioexpander_dev_s *dev, uint8_t pin,
              FAR bool *value);
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int mcp23x17_multiwritepin(FAR struct ioexpander_dev_s *dev,
-             FAR const uint8_t *pins, FAR bool *values, int count);
+             FAR const uint8_t *pins, FAR const bool *values, int count);
 static int mcp23x17_multireadpin(FAR struct ioexpander_dev_s *dev,
              FAR const uint8_t *pins, FAR bool *values, int count);
 static int mcp23x17_multireadbuf(FAR struct ioexpander_dev_s *dev,
@@ -572,7 +572,7 @@ static int mcp23x17_getmultibits(FAR struct mcp23x17_dev_s *priv,
 
 static int mcp23x17_multiwritepin(FAR struct ioexpander_dev_s *dev,
                                   FAR const uint8_t *pins,
-                                  FAR bool *values, int count)
+                                  FAR const bool *values, int count)
 {
   FAR struct mcp23x17_dev_s *priv = (FAR struct mcp23x17_dev_s *)dev;
   uint8_t addr = MCP23X17_GPIOA;
diff --git a/drivers/ioexpander/pca9538.c b/drivers/ioexpander/pca9538.c
index d0c75780d3..ac12a1a1c8 100644
--- a/drivers/ioexpander/pca9538.c
+++ b/drivers/ioexpander/pca9538.c
@@ -67,7 +67,7 @@ static int pca9538_readbuf(FAR struct ioexpander_dev_s *dev, uint8_t pin,
              FAR bool *value);
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int pca9538_multiwritepin(FAR struct ioexpander_dev_s *dev,
-             FAR const uint8_t *pins, FAR bool *values, int count);
+             FAR const uint8_t *pins, FAR const bool *values, int count);
 static int pca9538_multireadpin(FAR struct ioexpander_dev_s *dev,
              FAR const uint8_t *pins, FAR bool *values, int count);
 static int pca9538_multireadbuf(FAR struct ioexpander_dev_s *dev,
@@ -536,7 +536,7 @@ static int pca9538_getmultibits(FAR struct pca9538_dev_s *pca, uint8_t addr,
 
 static int pca9538_multiwritepin(FAR struct ioexpander_dev_s *dev,
                                  FAR const uint8_t *pins,
-                                 FAR bool *values, int count)
+                                 FAR const bool *values, int count)
 {
   FAR struct pca9538_dev_s *pca = (FAR struct pca9538_dev_s *)dev;
   uint8_t addr = PCA9538_REG_OUTPUT;
diff --git a/drivers/ioexpander/pca9555.c b/drivers/ioexpander/pca9555.c
index 03270c02f4..d74d633e7e 100644
--- a/drivers/ioexpander/pca9555.c
+++ b/drivers/ioexpander/pca9555.c
@@ -71,7 +71,7 @@ static int pca9555_readbuf(FAR struct ioexpander_dev_s *dev, uint8_t pin,
              FAR bool *value);
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int pca9555_multiwritepin(FAR struct ioexpander_dev_s *dev,
-             FAR const uint8_t *pins, FAR bool *values, int count);
+             FAR const uint8_t *pins, FAR const bool *values, int count);
 static int pca9555_multireadpin(FAR struct ioexpander_dev_s *dev,
              FAR const uint8_t *pins, FAR bool *values, int count);
 static int pca9555_multireadbuf(FAR struct ioexpander_dev_s *dev,
@@ -554,8 +554,8 @@ static int pca9555_getmultibits(FAR struct pca9555_dev_s *pca, uint8_t addr,
  ****************************************************************************/
 
 static int pca9555_multiwritepin(FAR struct ioexpander_dev_s *dev,
-                                 FAR const uint8_t *pins, FAR bool *values,
-                                 int count)
+                                 FAR const uint8_t *pins,
+                                 FAR const bool *values, int count)
 {
   FAR struct pca9555_dev_s *pca = (FAR struct pca9555_dev_s *)dev;
   uint8_t addr = PCA9555_REG_OUTPUT;
diff --git a/drivers/ioexpander/pcf8574.c b/drivers/ioexpander/pcf8574.c
index aa8c9edf01..9e8b1661fb 100644
--- a/drivers/ioexpander/pcf8574.c
+++ b/drivers/ioexpander/pcf8574.c
@@ -61,7 +61,7 @@ static int pcf8574_readpin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
              FAR bool *value);
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int pcf8574_multiwritepin(FAR struct ioexpander_dev_s *dev,
-             FAR const uint8_t *pins, FAR bool *values, int count);
+             FAR const uint8_t *pins, FAR const bool *values, int count);
 static int pcf8574_multireadpin(FAR struct ioexpander_dev_s *dev,
              FAR const uint8_t *pins, FAR bool *values, int count);
 #endif
@@ -527,7 +527,7 @@ errout_with_lock:
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int pcf8574_multiwritepin(FAR struct ioexpander_dev_s *dev,
                                  FAR const uint8_t *pins,
-                                 FAR bool *values, int count)
+                                 FAR const bool *values, int count)
 {
   FAR struct pcf8574_dev_s *priv = (FAR struct pcf8574_dev_s *)dev;
   uint8_t pin;
diff --git a/drivers/ioexpander/pcf8575.c b/drivers/ioexpander/pcf8575.c
index 4943d86115..a702953e31 100644
--- a/drivers/ioexpander/pcf8575.c
+++ b/drivers/ioexpander/pcf8575.c
@@ -63,7 +63,7 @@ static int pcf8575_readpin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
              FAR bool *value);
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int pcf8575_multiwritepin(FAR struct ioexpander_dev_s *dev,
-             FAR const uint8_t *pins, FAR bool *values, int count);
+             FAR const uint8_t *pins, FAR const bool *values, int count);
 static int pcf8575_multireadpin(FAR struct ioexpander_dev_s *dev,
              FAR const uint8_t *pins, FAR bool *values, int count);
 #endif
@@ -467,8 +467,8 @@ errout_with_lock:
 
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int pcf8575_multiwritepin(FAR struct ioexpander_dev_s *dev,
-                                 FAR const uint8_t *pins, FAR bool *values,
-                                 int count)
+                                 FAR const uint8_t *pins,
+                                 FAR const bool *values, int count)
 {
   FAR struct pcf8575_dev_s *priv = (FAR struct pcf8575_dev_s *)dev;
   uint8_t pin;
diff --git a/drivers/ioexpander/skeleton.c b/drivers/ioexpander/skeleton.c
index 1fe9c3541f..7f7d7de083 100644
--- a/drivers/ioexpander/skeleton.c
+++ b/drivers/ioexpander/skeleton.c
@@ -93,7 +93,7 @@ static int skel_readbuf(FAR struct ioexpander_dev_s *dev, uint8_t pin,
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int skel_multiwritepin(FAR struct ioexpander_dev_s *dev,
                               FAR const uint8_t *pins,
-                              FAR bool *values, int count);
+                              FAR const bool *values, int count);
 static int skel_multireadpin(FAR struct ioexpander_dev_s *dev,
                              FAR const uint8_t *pins,
                              FAR bool *values, int count);
@@ -430,7 +430,7 @@ static int skel_getmultibits(FAR struct skel_dev_s *priv, FAR uint8_t *pins,
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int skel_multiwritepin(FAR struct ioexpander_dev_s *dev,
                               FAR const uint8_t *pins,
-                              FAR bool *values, int count)
+                              FAR const bool *values, int count)
 {
   FAR struct skel_dev_s *priv = (FAR struct skel_dev_s *)dev;
   ioe_pinset_t pinset;
diff --git a/drivers/ioexpander/tca64xx.c b/drivers/ioexpander/tca64xx.c
index eceb96a314..91c9c517e3 100644
--- a/drivers/ioexpander/tca64xx.c
+++ b/drivers/ioexpander/tca64xx.c
@@ -68,7 +68,7 @@ static int tca64_readpin(FAR struct ioexpander_dev_s *dev, uint8_t pin,
              FAR bool *value);
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int tca64_multiwritepin(FAR struct ioexpander_dev_s *dev,
-             FAR const uint8_t *pins, FAR bool *values, int count);
+             FAR const uint8_t *pins, FAR const bool *values, int count);
 static int tca64_multireadpin(FAR struct ioexpander_dev_s *dev,
              FAR const uint8_t *pins, FAR bool *values, int count);
 #endif
@@ -761,7 +761,7 @@ errout_with_lock:
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
 static int tca64_multiwritepin(FAR struct ioexpander_dev_s *dev,
                                FAR const uint8_t *pins,
-                               FAR bool *values, int count)
+                               FAR const bool *values, int count)
 {
   FAR struct tca64_dev_s *priv = (FAR struct tca64_dev_s *)dev;
   ioe_pinset_t pinset;
diff --git a/include/nuttx/ioexpander/ioexpander.h b/include/nuttx/ioexpander/ioexpander.h
index a63946eaad..83e458c76f 100644
--- a/include/nuttx/ioexpander/ioexpander.h
+++ b/include/nuttx/ioexpander/ioexpander.h
@@ -331,8 +331,8 @@ struct ioexpander_ops_s
                           FAR bool *value);
 #ifdef CONFIG_IOEXPANDER_MULTIPIN
   CODE int (*ioe_multiwritepin)(FAR struct ioexpander_dev_s *dev,
-                                FAR const uint8_t *pins, FAR bool *values,
-                                int count);
+                                FAR const uint8_t *pins,
+                                FAR const bool *values, int count);
   CODE int (*ioe_multireadpin)(FAR struct ioexpander_dev_s *dev,
                                FAR const uint8_t *pins, FAR bool *values,
                                int count);