diff --git a/pinctrl/gpiochip_bcm2712.c b/pinctrl/gpiochip_bcm2712.c
index 4c65470..165136e 100644
--- a/pinctrl/gpiochip_bcm2712.c
+++ b/pinctrl/gpiochip_bcm2712.c
@@ -41,7 +41,7 @@ struct bcm2712_inst
 };
 
 static unsigned num_instances;
-static struct bcm2712_inst bcm2712_instances[BCM2712_MAX_INSTANCES] = { 0 };
+static struct bcm2712_inst bcm2712_instances[BCM2712_MAX_INSTANCES] = { {0,0,0,0,0,0,0} };
 static unsigned shared_flags;
 
 static const char *bcm2712_c0_gpio_alt_names[][BCM2712_FSEL_COUNT - 1] =
@@ -328,7 +328,7 @@ static volatile uint32_t *bcm2712_pad_base(struct bcm2712_inst *inst,
 
 static int bcm2712_gpio_get_level(void *priv, unsigned gpio)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     unsigned int bit;
     volatile uint32_t *gpio_base = bcm2712_gpio_base(inst, gpio, &bit);
 
@@ -340,7 +340,7 @@ static int bcm2712_gpio_get_level(void *priv, unsigned gpio)
 
 static void bcm2712_gpio_set_drive(void *priv, unsigned gpio, GPIO_DRIVE_T drv)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     unsigned int bit;
     volatile uint32_t *gpio_base = bcm2712_gpio_base(inst, gpio, &bit);
     uint32_t gpio_val;
@@ -355,7 +355,7 @@ static void bcm2712_gpio_set_drive(void *priv, unsigned gpio, GPIO_DRIVE_T drv)
 
 static GPIO_DRIVE_T bcm2712_gpio_get_drive(void *priv, unsigned gpio)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     unsigned int bit;
     volatile uint32_t *gpio_base = bcm2712_gpio_base(inst, gpio, &bit);
     uint32_t gpio_val;
@@ -369,7 +369,7 @@ static GPIO_DRIVE_T bcm2712_gpio_get_drive(void *priv, unsigned gpio)
 
 static void bcm2712_gpio_set_dir(void *priv, unsigned gpio, GPIO_DIR_T dir)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     unsigned int bit;
     volatile uint32_t *gpio_base = bcm2712_gpio_base(inst, gpio, &bit);
     uint32_t gpio_val;
@@ -385,7 +385,7 @@ static void bcm2712_gpio_set_dir(void *priv, unsigned gpio, GPIO_DIR_T dir)
 
 static GPIO_DIR_T bcm2712_gpio_get_dir(void *priv, unsigned gpio)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     unsigned int bit;
     volatile uint32_t *gpio_base = bcm2712_gpio_base(inst, gpio, &bit);
     uint32_t gpio_val;
@@ -399,30 +399,30 @@ static GPIO_DIR_T bcm2712_gpio_get_dir(void *priv, unsigned gpio)
 
 static GPIO_FSEL_T bcm2712_pinctrl_get_fsel(void *priv, unsigned gpio)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     unsigned int pinmux_bit;
     volatile uint32_t *pinmux_base = bcm2712_pinmux_base(inst, gpio, &pinmux_bit);
     int fsel;
 
     if (!pinmux_base)
-        return -1;
+        return (GPIO_FSEL_T)-1;
 
     fsel = ((*pinmux_base >> pinmux_bit) & 0xf);
 
     if (fsel == 0)
         return GPIO_FSEL_GPIO;
     else if (fsel < BCM2712_FSEL_COUNT)
-        return GPIO_FSEL_FUNC1 + (fsel - 1);
+        return (GPIO_FSEL_T)(GPIO_FSEL_FUNC1 + (fsel - 1));
     else if (fsel == 0xf) // Choose one value as a considered NONE
         return GPIO_FSEL_NONE;
 
     /* Unknown FSEL */
-    return -1;
+    return (GPIO_FSEL_T)-1;
 }
 
 static void bcm2712_pinctrl_set_fsel(void *priv, unsigned gpio, const GPIO_FSEL_T func)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     unsigned int pinmux_bit;
     volatile uint32_t *pinmux_base = bcm2712_pinmux_base(inst, gpio, &pinmux_bit);
     uint32_t pinmux_val;
@@ -458,7 +458,7 @@ static void bcm2712_pinctrl_set_fsel(void *priv, unsigned gpio, const GPIO_FSEL_
 
 static GPIO_PULL_T bcm2712_pinctrl_get_pull(void *priv, unsigned gpio)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     unsigned int bit;
     volatile uint32_t *pad_base = bcm2712_pad_base(inst, gpio, &bit);
     uint32_t pad_val;
@@ -482,7 +482,7 @@ static GPIO_PULL_T bcm2712_pinctrl_get_pull(void *priv, unsigned gpio)
 
 static void bcm2712_pinctrl_set_pull(void *priv, unsigned gpio, GPIO_PULL_T pull)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     unsigned int bit = 0;
     volatile uint32_t *pad_base = bcm2712_pad_base(inst, gpio, &bit);
     uint32_t padval;
@@ -589,14 +589,14 @@ static void *bcm2712_gpio_create_instance(const GPIO_CHIP_T *chip,
 
 static int bcm2712_gpio_count(void *priv)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
 
     return inst->num_gpios;
 }
 
 static void *bcm2712_gpio_probe_instance(void *priv, volatile uint32_t *base)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
 
     inst->gpio_base = base;
 
@@ -672,7 +672,7 @@ static void *bcm2712_pinctrl_create_instance(const GPIO_CHIP_T *chip,
 
 static int bcm2712_pinctrl_count(void *priv)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
 
     if (inst->flags & FLAGS_GPIO)
         return 0;  /* Don't occupy any GPIO space */
@@ -702,7 +702,7 @@ static int bcm2712_pinctrl_count(void *priv)
 
 static void *bcm2712_pinctrl_probe_instance(void *priv, volatile uint32_t *base)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     unsigned pad_offset;
 
     inst->pinmux_base = base;
@@ -731,7 +731,7 @@ static void *bcm2712_pinctrl_probe_instance(void *priv, volatile uint32_t *base)
 
 static const char *bcm2712_pinctrl_get_fsel_name(void *priv, unsigned gpio, GPIO_FSEL_T fsel)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     const char *name = NULL;
 
     switch (fsel)
@@ -788,7 +788,7 @@ static const char *bcm2712_pinctrl_get_fsel_name(void *priv, unsigned gpio, GPIO
 
 static const char *bcm2712_gpio_get_name(void *priv, unsigned gpio)
 {
-    struct bcm2712_inst *inst = priv;
+    struct bcm2712_inst *inst = (struct bcm2712_inst*)priv;
     const char *fsel_name;
     static char name_buf[16];
     unsigned gpio_offset;
diff --git a/pinctrl/gpiochip_bcm2835.c b/pinctrl/gpiochip_bcm2835.c
index 1befc01..626f480 100644
--- a/pinctrl/gpiochip_bcm2835.c
+++ b/pinctrl/gpiochip_bcm2835.c
@@ -157,7 +157,7 @@ static const char *bcm2711_gpio_alt_names[BCM2711_NUM_GPIOS][BCM2711_ALT_COUNT]
 
 static GPIO_FSEL_T bcm2835_gpio_get_fsel(void *priv, unsigned gpio)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     /* GPFSEL0-5 with 10 sels per reg, 3 bits per sel (so bits 0:29 used) */
     uint32_t reg = GPFSEL0 + (gpio / 10);
     uint32_t lsb = (gpio % 10) * 3;
@@ -182,7 +182,7 @@ static GPIO_FSEL_T bcm2835_gpio_get_fsel(void *priv, unsigned gpio)
 
 static void bcm2835_gpio_set_fsel(void *priv, unsigned gpio, const GPIO_FSEL_T func)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     /* GPFSEL0-5 with 10 sels per reg, 3 bits per sel (so bits 0:29 used) */
     uint32_t reg = GPFSEL0 + (gpio / 10);
     uint32_t lsb = (gpio % 10) * 3;
@@ -232,7 +232,7 @@ static void bcm2835_gpio_set_dir(void *priv, unsigned gpio, GPIO_DIR_T dir)
 
 static int bcm2835_gpio_get_level(void *priv, unsigned gpio)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
 
     if (gpio >= BCM2835_NUM_GPIOS)
         return -1;
@@ -250,7 +250,7 @@ GPIO_DRIVE_T bcm2835_gpio_get_drive(void *priv, unsigned gpio)
 
 static void bcm2835_gpio_set_drive(void *priv, unsigned gpio, GPIO_DRIVE_T drv)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
 
     if (gpio < BCM2835_NUM_GPIOS && drv <= DRIVE_HIGH)
         base[(drv ? GPSET0 : GPCLR0) + (gpio / 32)] = (1 << (gpio % 32));
@@ -266,7 +266,7 @@ static GPIO_PULL_T bcm2835_gpio_get_pull(void *priv, unsigned gpio)
 
 static void bcm2835_gpio_set_pull(void *priv, unsigned gpio, GPIO_PULL_T pull)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     int clkreg = GPPUDCLK0 + (gpio / 32);
     int clkbit = 1 << (gpio % 32);
 
@@ -324,7 +324,7 @@ static const char *bcm2835_gpio_get_fsel_name(void *priv, unsigned gpio, GPIO_FS
 
 static GPIO_PULL_T bcm2711_gpio_get_pull(void *priv, unsigned gpio)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     int reg = GPPUPPDN0 + (gpio / 16);
     int lsb = (gpio % 16) * 2;
 
@@ -343,7 +343,7 @@ static GPIO_PULL_T bcm2711_gpio_get_pull(void *priv, unsigned gpio)
 
 static void bcm2711_gpio_set_pull(void *priv, unsigned gpio, GPIO_PULL_T pull)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     int reg = GPPUPPDN0 + (gpio / 16);
     int lsb = (gpio % 16) * 2;
     int pull_val;
diff --git a/pinctrl/gpiochip_rp1.c b/pinctrl/gpiochip_rp1.c
index 7bb0003..b5b5f46 100644
--- a/pinctrl/gpiochip_rp1.c
+++ b/pinctrl/gpiochip_rp1.c
@@ -228,7 +228,7 @@ static void rp1_gpio_sys_rio_oe_set(volatile uint32_t *base, int bank, int offse
 
 static void rp1_gpio_set_dir(void *priv, uint32_t gpio, GPIO_DIR_T dir)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     int bank, offset;
 
     rp1_gpio_get_bank(gpio, &bank, &offset);
@@ -243,7 +243,7 @@ static void rp1_gpio_set_dir(void *priv, uint32_t gpio, GPIO_DIR_T dir)
 
 static GPIO_DIR_T rp1_gpio_get_dir(void *priv, unsigned gpio)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     int bank, offset;
     GPIO_DIR_T dir;
     uint32_t reg;
@@ -258,7 +258,7 @@ static GPIO_DIR_T rp1_gpio_get_dir(void *priv, unsigned gpio)
 
 static GPIO_FSEL_T rp1_gpio_get_fsel(void *priv, unsigned gpio)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     int bank, offset;
     uint32_t reg;
     GPIO_FSEL_T fsel;
@@ -266,7 +266,7 @@ static GPIO_FSEL_T rp1_gpio_get_fsel(void *priv, unsigned gpio)
 
     rp1_gpio_get_bank(gpio, &bank, &offset);
     reg = rp1_gpio_ctrl_read(base, bank, offset);
-    rsel = ((reg & RP1_GPIO_CTRL_FSEL_MASK) >> RP1_GPIO_CTRL_FSEL_LSB);
+    rsel = (RP1_FSEL_T)((reg & RP1_GPIO_CTRL_FSEL_MASK) >> RP1_GPIO_CTRL_FSEL_LSB);
     if (rsel == RP1_FSEL_SYS_RIO)
         fsel = GPIO_FSEL_GPIO;
     else if (rsel == RP1_FSEL_NULL)
@@ -281,7 +281,7 @@ static GPIO_FSEL_T rp1_gpio_get_fsel(void *priv, unsigned gpio)
 
 static void rp1_gpio_set_fsel(void *priv, unsigned gpio, const GPIO_FSEL_T func)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     int bank, offset;
     uint32_t ctrl_reg;
     uint32_t pad_reg;
@@ -339,7 +339,7 @@ static void rp1_gpio_set_fsel(void *priv, unsigned gpio, const GPIO_FSEL_T func)
 
 static int rp1_gpio_get_level(void *priv, unsigned gpio)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     int bank, offset;
     uint32_t pad_reg;
     uint32_t reg;
@@ -357,7 +357,7 @@ static int rp1_gpio_get_level(void *priv, unsigned gpio)
 
 static void rp1_gpio_set_drive(void *priv, unsigned gpio, GPIO_DRIVE_T drv)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     int bank, offset;
 
     rp1_gpio_get_bank(gpio, &bank, &offset);
@@ -369,7 +369,7 @@ static void rp1_gpio_set_drive(void *priv, unsigned gpio, GPIO_DRIVE_T drv)
 
 static void rp1_gpio_set_pull(void *priv, unsigned gpio, GPIO_PULL_T pull)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     uint32_t reg;
     int bank, offset;
 
@@ -385,7 +385,7 @@ static void rp1_gpio_set_pull(void *priv, unsigned gpio, GPIO_PULL_T pull)
 
 static GPIO_PULL_T rp1_gpio_get_pull(void *priv, unsigned gpio)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     uint32_t reg;
     GPIO_PULL_T pull = PULL_NONE;
     int bank, offset;
@@ -402,7 +402,7 @@ static GPIO_PULL_T rp1_gpio_get_pull(void *priv, unsigned gpio)
 
 static GPIO_DRIVE_T rp1_gpio_get_drive(void *priv, unsigned gpio)
 {
-    volatile uint32_t *base = priv;
+    volatile uint32_t *base = (volatile uint32_t*)priv;
     uint32_t reg;
     int bank, offset;
 
diff --git a/pinctrl/util.c b/pinctrl/util.c
index ff9fc95..19cdd4e 100644
--- a/pinctrl/util.c
+++ b/pinctrl/util.c
@@ -46,7 +46,7 @@ static void *do_read_file(const char *fname, const char *mode, size_t *plen)
 
 char *read_text_file(const char *fname, size_t *plen)
 {
-    return do_read_file(fname, "rt", plen);
+    return (char*)do_read_file(fname, "rt", plen);
 }
 
 void *read_file(const char *fname, size_t *plen)
@@ -73,7 +73,7 @@ char *dt_read_prop(const char *node, const char *prop, size_t *plen)
 
     filename[sizeof(filename) - 1] = '\0';
 
-    return read_file(filename, plen);
+    return (char*)read_file(filename, plen);
 }
 
 uint32_t *dt_read_cells(const char *node, const char *prop, unsigned *num_cells)