svn commit: r356891 - head/sys/arm/allwinner
Emmanuel Vadot
manu at FreeBSD.org
Sun Jan 19 19:51:20 UTC 2020
Author: manu
Date: Sun Jan 19 19:51:20 2020
New Revision: 356891
URL: https://svnweb.freebsd.org/changeset/base/356891
Log:
arm: allwinner: Add GPIO Interrupt support
Not all pins in Allwinner have interrupts support so we rely
on the padconf data to add the proper caps when pin_getcaps is called.
The pin is switch to the specific "eint" function during setup_intr and
switched back to its old function in teardown_intr.
Only INTR_MAP_DATA_GPIO is supported for now.
MFC after: 1 month
Modified:
head/sys/arm/allwinner/aw_gpio.c
Modified: head/sys/arm/allwinner/aw_gpio.c
==============================================================================
--- head/sys/arm/allwinner/aw_gpio.c Sun Jan 19 19:47:04 2020 (r356890)
+++ head/sys/arm/allwinner/aw_gpio.c Sun Jan 19 19:51:20 2020 (r356891)
@@ -41,6 +41,7 @@ __FBSDID("$FreeBSD$");
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/gpio.h>
+#include <sys/proc.h>
#include <machine/bus.h>
#include <machine/resource.h>
@@ -61,11 +62,18 @@ __FBSDID("$FreeBSD$");
#include "opt_soc.h"
#endif
+#ifdef INTRNG
+#include "pic_if.h"
+#endif
+
#include "gpio_if.h"
#define AW_GPIO_DEFAULT_CAPS (GPIO_PIN_INPUT | GPIO_PIN_OUTPUT | \
- GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN)
+ GPIO_PIN_PULLUP | GPIO_PIN_PULLDOWN);
+#define AW_GPIO_INTR_CAPS (GPIO_INTR_LEVEL_LOW | GPIO_INTR_LEVEL_HIGH | \
+ GPIO_INTR_EDGE_RISING | GPIO_INTR_EDGE_FALLING | GPIO_INTR_EDGE_BOTH)
+
#define AW_GPIO_NONE 0
#define AW_GPIO_PULLUP 1
#define AW_GPIO_PULLDOWN 2
@@ -249,19 +257,47 @@ struct clk_list {
clk_t clk;
};
+#ifdef INTRNG
+struct gpio_irqsrc {
+ struct intr_irqsrc isrc;
+ u_int irq;
+ uint32_t mode;
+ uint32_t pin;
+ uint32_t bank;
+ uint32_t intnum;
+ uint32_t intfunc;
+ uint32_t oldfunc;
+ bool enabled;
+};
+#endif
+
+#define AW_GPIO_MEMRES 0
+#define AW_GPIO_IRQRES 1
+#define AW_GPIO_RESSZ 2
+
struct aw_gpio_softc {
device_t sc_dev;
device_t sc_busdev;
+ struct resource * sc_res[AW_GPIO_RESSZ];
struct mtx sc_mtx;
struct resource * sc_mem_res;
struct resource * sc_irq_res;
- bus_space_tag_t sc_bst;
- bus_space_handle_t sc_bsh;
void * sc_intrhand;
struct aw_gpio_conf *conf;
TAILQ_HEAD(, clk_list) clk_list;
+
+#ifdef INTRNG
+ struct gpio_irqsrc *gpio_pic_irqsrc;
+ int nirqs;
+#endif
};
+static struct resource_spec aw_gpio_res_spec[] = {
+ { SYS_RES_MEMORY, 0, RF_ACTIVE },
+ { SYS_RES_IRQ, 0, RF_ACTIVE | RF_SHAREABLE },
+ { -1, 0, 0 }
+};
+
#define AW_GPIO_LOCK(_sc) mtx_lock_spin(&(_sc)->sc_mtx)
#define AW_GPIO_UNLOCK(_sc) mtx_unlock_spin(&(_sc)->sc_mtx)
#define AW_GPIO_LOCK_ASSERT(_sc) mtx_assert(&(_sc)->sc_mtx, MA_OWNED)
@@ -271,15 +307,19 @@ struct aw_gpio_softc {
#define AW_GPIO_GP_DRV(_bank, _idx) 0x14 + ((_bank) * 0x24) + ((_idx) << 2)
#define AW_GPIO_GP_PUL(_bank, _idx) 0x1c + ((_bank) * 0x24) + ((_idx) << 2)
-#define AW_GPIO_GP_INT_CFG0 0x200
-#define AW_GPIO_GP_INT_CFG1 0x204
-#define AW_GPIO_GP_INT_CFG2 0x208
-#define AW_GPIO_GP_INT_CFG3 0x20c
+#define AW_GPIO_GP_INT_BASE(_bank) (0x200 + 0x20 * _bank)
-#define AW_GPIO_GP_INT_CTL 0x210
-#define AW_GPIO_GP_INT_STA 0x214
-#define AW_GPIO_GP_INT_DEB 0x218
+#define AW_GPIO_GP_INT_CFG(_bank, _pin) (AW_GPIO_GP_INT_BASE(_bank) + (0x4 * ((_pin) / 8)))
+#define AW_GPIO_GP_INT_CTL(_bank) (AW_GPIO_GP_INT_BASE(_bank) + 0x10)
+#define AW_GPIO_GP_INT_STA(_bank) (AW_GPIO_GP_INT_BASE(_bank) + 0x14)
+#define AW_GPIO_GP_INT_DEB(_bank) (AW_GPIO_GP_INT_BASE(_bank) + 0x18)
+#define AW_GPIO_INT_EDGE_POSITIVE 0x0
+#define AW_GPIO_INT_EDGE_NEGATIVE 0x1
+#define AW_GPIO_INT_LEVEL_HIGH 0x2
+#define AW_GPIO_INT_LEVEL_LOW 0x3
+#define AW_GPIO_INT_EDGE_BOTH 0x4
+
static char *aw_gpio_parse_function(phandle_t node);
static const char **aw_gpio_parse_pins(phandle_t node, int *pins_nb);
static uint32_t aw_gpio_parse_bias(phandle_t node);
@@ -290,10 +330,16 @@ static int aw_gpio_pin_set(device_t dev, uint32_t pin,
static int aw_gpio_pin_get_locked(struct aw_gpio_softc *sc, uint32_t pin, unsigned int *value);
static int aw_gpio_pin_set_locked(struct aw_gpio_softc *sc, uint32_t pin, unsigned int value);
+static void aw_gpio_intr(void *arg);
+static void aw_gpio_pic_disable_intr(device_t dev, struct intr_irqsrc *isrc);
+static void aw_gpio_pic_disable_intr_locked(struct aw_gpio_softc *sc, struct intr_irqsrc *isrc);
+static void aw_gpio_pic_post_filter(device_t dev, struct intr_irqsrc *isrc);
+static int aw_gpio_register_isrcs(struct aw_gpio_softc *sc);
+
#define AW_GPIO_WRITE(_sc, _off, _val) \
- bus_space_write_4(_sc->sc_bst, _sc->sc_bsh, _off, _val)
+ bus_write_4((_sc)->sc_res[AW_GPIO_MEMRES], _off, _val)
#define AW_GPIO_READ(_sc, _off) \
- bus_space_read_4(_sc->sc_bst, _sc->sc_bsh, _off)
+ bus_read_4((_sc)->sc_res[AW_GPIO_MEMRES], _off)
static uint32_t
aw_gpio_get_function(struct aw_gpio_softc *sc, uint32_t pin)
@@ -492,6 +538,8 @@ aw_gpio_pin_getcaps(device_t dev, uint32_t pin, uint32
return (EINVAL);
*caps = AW_GPIO_DEFAULT_CAPS;
+ if (sc->conf->padconf->pins[pin].eint_func != 0)
+ *caps |= AW_GPIO_INTR_CAPS;
return (0);
}
@@ -807,6 +855,27 @@ aw_gpio_pin_config_32(device_t dev, uint32_t first_pin
}
static int
+aw_gpio_map_gpios(device_t bus, phandle_t dev, phandle_t gparent, int gcells,
+ pcell_t *gpios, uint32_t *pin, uint32_t *flags)
+{
+ struct aw_gpio_softc *sc;
+ int i;
+
+ sc = device_get_softc(bus);
+
+ /* The GPIO pins are mapped as: <gpio-phandle bank pin flags>. */
+ for (i = 0; i < sc->conf->padconf->npins; i++)
+ if (sc->conf->padconf->pins[i].port == gpios[0] &&
+ sc->conf->padconf->pins[i].pin == gpios[1]) {
+ *pin = i;
+ break;
+ }
+ *flags = gpios[gcells - 1];
+
+ return (0);
+}
+
+static int
aw_find_pinnum_by_name(struct aw_gpio_softc *sc, const char *pinname)
{
int i;
@@ -938,7 +1007,7 @@ aw_gpio_probe(device_t dev)
static int
aw_gpio_attach(device_t dev)
{
- int rid, error;
+ int error;
phandle_t gpio;
struct aw_gpio_softc *sc;
struct clk_list *clkp, *clkp_tmp;
@@ -951,22 +1020,15 @@ aw_gpio_attach(device_t dev)
mtx_init(&sc->sc_mtx, "aw gpio", "gpio", MTX_SPIN);
- rid = 0;
- sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
- RF_ACTIVE);
- if (!sc->sc_mem_res) {
- device_printf(dev, "cannot allocate memory window\n");
- goto fail;
+ if (bus_alloc_resources(dev, aw_gpio_res_spec, sc->sc_res) != 0) {
+ device_printf(dev, "cannot allocate device resources\n");
+ return (ENXIO);
}
- sc->sc_bst = rman_get_bustag(sc->sc_mem_res);
- sc->sc_bsh = rman_get_bushandle(sc->sc_mem_res);
-
- rid = 0;
- sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
- RF_ACTIVE);
- if (!sc->sc_irq_res) {
- device_printf(dev, "cannot allocate interrupt\n");
+ if (bus_setup_intr(dev, sc->sc_res[AW_GPIO_IRQRES],
+ INTR_TYPE_CLK | INTR_MPSAFE, NULL, aw_gpio_intr, sc,
+ &sc->sc_intrhand)) {
+ device_printf(dev, "cannot setup interrupt handler\n");
goto fail;
}
@@ -1009,6 +1071,11 @@ aw_gpio_attach(device_t dev)
goto fail;
}
+#ifdef INTRNG
+ aw_gpio_register_isrcs(sc);
+ intr_pic_register(dev, OF_xref_from_node(ofw_bus_get_node(dev)));
+#endif
+
sc->sc_busdev = gpiobus_attach_bus(dev);
if (sc->sc_busdev == NULL)
goto fail;
@@ -1062,40 +1129,339 @@ aw_gpio_detach(device_t dev)
return (EBUSY);
}
-static phandle_t
-aw_gpio_get_node(device_t dev, device_t bus)
+static void
+aw_gpio_intr(void *arg)
{
+ struct aw_gpio_softc *sc;
+ struct intr_irqsrc *isrc;
+ uint32_t reg;
+ int irq;
- /* We only have one child, the GPIO bus, which needs our own node. */
- return (ofw_bus_get_node(dev));
+ sc = (struct aw_gpio_softc *)arg;
+
+ AW_GPIO_LOCK(sc);
+ for (irq = 0; irq < sc->nirqs; irq++) {
+ if (!sc->gpio_pic_irqsrc[irq].enabled)
+ continue;
+
+ reg = AW_GPIO_READ(sc, AW_GPIO_GP_INT_STA(sc->gpio_pic_irqsrc[irq].bank));
+ if (!(reg & (1 << sc->gpio_pic_irqsrc[irq].intnum)))
+ continue;
+
+ isrc = &sc->gpio_pic_irqsrc[irq].isrc;
+ if (intr_isrc_dispatch(isrc, curthread->td_intr_frame) != 0) {
+ aw_gpio_pic_disable_intr_locked(sc, isrc);
+ aw_gpio_pic_post_filter(sc->sc_dev, isrc);
+ device_printf(sc->sc_dev, "Stray irq %u disabled\n", irq);
+ }
+ }
+ AW_GPIO_UNLOCK(sc);
}
+/*
+ * Interrupts support
+ */
+
static int
-aw_gpio_map_gpios(device_t bus, phandle_t dev, phandle_t gparent, int gcells,
- pcell_t *gpios, uint32_t *pin, uint32_t *flags)
+aw_gpio_register_isrcs(struct aw_gpio_softc *sc)
{
+ const char *name;
+ int nirqs;
+ int pin;
+ int err;
+
+ name = device_get_nameunit(sc->sc_dev);
+
+ for (nirqs = 0, pin = 0; pin < sc->conf->padconf->npins; pin++) {
+ if (sc->conf->padconf->pins[pin].eint_func == 0)
+ continue;
+
+ nirqs++;
+ }
+
+ sc->gpio_pic_irqsrc = malloc(sizeof(*sc->gpio_pic_irqsrc) * nirqs,
+ M_DEVBUF, M_WAITOK | M_ZERO);
+ for (nirqs = 0, pin = 0; pin < sc->conf->padconf->npins; pin++) {
+ if (sc->conf->padconf->pins[pin].eint_func == 0)
+ continue;
+
+ sc->gpio_pic_irqsrc[nirqs].pin = pin;
+ sc->gpio_pic_irqsrc[nirqs].bank = sc->conf->padconf->pins[pin].eint_bank;
+ sc->gpio_pic_irqsrc[nirqs].intnum = sc->conf->padconf->pins[pin].eint_num;
+ sc->gpio_pic_irqsrc[nirqs].intfunc = sc->conf->padconf->pins[pin].eint_func;
+ sc->gpio_pic_irqsrc[nirqs].irq = nirqs;
+ sc->gpio_pic_irqsrc[nirqs].mode = GPIO_INTR_CONFORM;
+
+ err = intr_isrc_register(&sc->gpio_pic_irqsrc[nirqs].isrc,
+ sc->sc_dev, 0, "%s,%s", name,
+ sc->conf->padconf->pins[pin].functions[sc->conf->padconf->pins[pin].eint_func]);
+ if (err) {
+ device_printf(sc->sc_dev, "intr_isrs_register failed for irq %d\n", nirqs);
+ }
+
+ nirqs++;
+ }
+
+ sc->nirqs = nirqs;
+
+ return (0);
+}
+
+static void
+aw_gpio_pic_disable_intr_locked(struct aw_gpio_softc *sc, struct intr_irqsrc *isrc)
+{
+ u_int irq;
+ uint32_t reg;
+
+ AW_GPIO_LOCK_ASSERT(sc);
+ irq = ((struct gpio_irqsrc *)isrc)->irq;
+ reg = AW_GPIO_READ(sc, AW_GPIO_GP_INT_CTL(sc->gpio_pic_irqsrc[irq].bank));
+ reg &= ~(1 << sc->gpio_pic_irqsrc[irq].intnum);
+ AW_GPIO_WRITE(sc, AW_GPIO_GP_INT_CTL(sc->gpio_pic_irqsrc[irq].bank), reg);
+
+ sc->gpio_pic_irqsrc[irq].enabled = false;
+}
+
+static void
+aw_gpio_pic_disable_intr(device_t dev, struct intr_irqsrc *isrc)
+{
struct aw_gpio_softc *sc;
- int i;
- sc = device_get_softc(bus);
+ sc = device_get_softc(dev);
- /* The GPIO pins are mapped as: <gpio-phandle bank pin flags>. */
- for (i = 0; i < sc->conf->padconf->npins; i++)
- if (sc->conf->padconf->pins[i].port == gpios[0] &&
- sc->conf->padconf->pins[i].pin == gpios[1]) {
- *pin = i;
+ AW_GPIO_LOCK(sc);
+ aw_gpio_pic_disable_intr_locked(sc, isrc);
+ AW_GPIO_UNLOCK(sc);
+}
+
+static void
+aw_gpio_pic_enable_intr(device_t dev, struct intr_irqsrc *isrc)
+{
+ struct aw_gpio_softc *sc;
+ u_int irq;
+ uint32_t reg;
+
+ sc = device_get_softc(dev);
+ irq = ((struct gpio_irqsrc *)isrc)->irq;
+ AW_GPIO_LOCK(sc);
+ reg = AW_GPIO_READ(sc, AW_GPIO_GP_INT_CTL(sc->gpio_pic_irqsrc[irq].bank));
+ reg |= 1 << sc->gpio_pic_irqsrc[irq].intnum;
+ AW_GPIO_WRITE(sc, AW_GPIO_GP_INT_CTL(sc->gpio_pic_irqsrc[irq].bank), reg);
+ AW_GPIO_UNLOCK(sc);
+
+ sc->gpio_pic_irqsrc[irq].enabled = true;
+}
+
+static int
+aw_gpio_pic_map_gpio(struct aw_gpio_softc *sc, struct intr_map_data_gpio *dag,
+ u_int *irqp, u_int *mode)
+{
+ u_int irq;
+ int pin;
+
+ irq = dag->gpio_pin_num;
+
+ for (pin = 0; pin < sc->nirqs; pin++)
+ if (sc->gpio_pic_irqsrc[pin].pin == irq)
break;
- }
- *flags = gpios[gcells - 1];
+ if (pin == sc->nirqs) {
+ device_printf(sc->sc_dev, "Invalid interrupt number %u\n", irq);
+ return (EINVAL);
+ }
+ switch (dag->gpio_intr_mode) {
+ case GPIO_INTR_LEVEL_LOW:
+ case GPIO_INTR_LEVEL_HIGH:
+ case GPIO_INTR_EDGE_RISING:
+ case GPIO_INTR_EDGE_FALLING:
+ case GPIO_INTR_EDGE_BOTH:
+ break;
+ default:
+ device_printf(sc->sc_dev, "Unsupported interrupt mode 0x%8x\n",
+ dag->gpio_intr_mode);
+ return (EINVAL);
+ }
+
+ *irqp = pin;
+ if (mode != NULL)
+ *mode = dag->gpio_intr_mode;
+
return (0);
}
+static int
+aw_gpio_pic_map_intr(device_t dev, struct intr_map_data *data,
+ struct intr_irqsrc **isrcp)
+{
+ struct aw_gpio_softc *sc;
+ u_int irq;
+ int err;
+
+ sc = device_get_softc(dev);
+ switch (data->type) {
+ case INTR_MAP_DATA_GPIO:
+ err = aw_gpio_pic_map_gpio(sc,
+ (struct intr_map_data_gpio *)data,
+ &irq, NULL);
+ break;
+ default:
+ return (ENOTSUP);
+ };
+
+ if (err == 0)
+ *isrcp = &sc->gpio_pic_irqsrc[irq].isrc;
+ return (0);
+}
+
+static int
+aw_gpio_pic_setup_intr(device_t dev, struct intr_irqsrc *isrc,
+ struct resource *res, struct intr_map_data *data)
+{
+ struct aw_gpio_softc *sc;
+ struct gpio_irqsrc *gi;
+ uint32_t irqcfg;
+ uint32_t pinidx, reg;
+ u_int irq, mode;
+ int err;
+
+ sc = device_get_softc(dev);
+ gi = (struct gpio_irqsrc *)isrc;
+
+ switch (data->type) {
+ case INTR_MAP_DATA_GPIO:
+ err = aw_gpio_pic_map_gpio(sc,
+ (struct intr_map_data_gpio *)data,
+ &irq, &mode);
+ break;
+ default:
+ return (ENOTSUP);
+ };
+
+ pinidx = (sc->gpio_pic_irqsrc[irq].intnum % 8) * 4;
+
+ AW_GPIO_LOCK(sc);
+ switch (mode) {
+ case GPIO_INTR_LEVEL_LOW:
+ irqcfg = AW_GPIO_INT_LEVEL_LOW << pinidx;
+ break;
+ case GPIO_INTR_LEVEL_HIGH:
+ irqcfg = AW_GPIO_INT_LEVEL_HIGH << pinidx;
+ break;
+ case GPIO_INTR_EDGE_RISING:
+ irqcfg = AW_GPIO_INT_EDGE_POSITIVE << pinidx;
+ break;
+ case GPIO_INTR_EDGE_FALLING:
+ irqcfg = AW_GPIO_INT_EDGE_NEGATIVE << pinidx;
+ break;
+ case GPIO_INTR_EDGE_BOTH:
+ irqcfg = AW_GPIO_INT_EDGE_BOTH << pinidx;
+ break;
+ }
+
+ /* Switch the pin to interrupt mode */
+ sc->gpio_pic_irqsrc[irq].oldfunc = aw_gpio_get_function(sc,
+ sc->gpio_pic_irqsrc[irq].pin);
+ aw_gpio_set_function(sc, sc->gpio_pic_irqsrc[irq].pin,
+ sc->gpio_pic_irqsrc[irq].intfunc);
+
+ /* Write interrupt mode */
+ reg = AW_GPIO_READ(sc,
+ AW_GPIO_GP_INT_CFG(sc->gpio_pic_irqsrc[irq].bank,
+ sc->gpio_pic_irqsrc[irq].intnum));
+ reg &= ~(0xF << pinidx);
+ reg |= irqcfg;
+ AW_GPIO_WRITE(sc,
+ AW_GPIO_GP_INT_CFG(sc->gpio_pic_irqsrc[irq].bank,
+ sc->gpio_pic_irqsrc[irq].intnum),
+ reg);
+
+ AW_GPIO_UNLOCK(sc);
+
+ return (0);
+}
+
+static int
+aw_gpio_pic_teardown_intr(device_t dev, struct intr_irqsrc *isrc,
+ struct resource *res, struct intr_map_data *data)
+{
+ struct aw_gpio_softc *sc;
+ struct gpio_irqsrc *gi;
+
+ sc = device_get_softc(dev);
+ gi = (struct gpio_irqsrc *)isrc;
+
+ /* Switch back the pin to it's original function */
+ AW_GPIO_LOCK(sc);
+ aw_gpio_set_function(sc, gi->pin, gi->oldfunc);
+ AW_GPIO_UNLOCK(sc);
+
+ return (0);
+}
+
+static void
+aw_gpio_pic_post_filter(device_t dev, struct intr_irqsrc *isrc)
+{
+ struct aw_gpio_softc *sc;
+ struct gpio_irqsrc *gi;
+
+ sc = device_get_softc(dev);
+ gi = (struct gpio_irqsrc *)isrc;
+
+ arm_irq_memory_barrier(0);
+ AW_GPIO_WRITE(sc, AW_GPIO_GP_INT_STA(gi->bank), 1 << gi->intnum);
+}
+
+static void
+aw_gpio_pic_post_ithread(device_t dev, struct intr_irqsrc *isrc)
+{
+ struct aw_gpio_softc *sc;
+ struct gpio_irqsrc *gi;
+
+ sc = device_get_softc(dev);
+ gi = (struct gpio_irqsrc *)isrc;
+
+ arm_irq_memory_barrier(0);
+ AW_GPIO_WRITE(sc, AW_GPIO_GP_INT_STA(gi->bank), 1 << gi->intnum);
+ aw_gpio_pic_enable_intr(dev, isrc);
+}
+
+static void
+aw_gpio_pic_pre_ithread(device_t dev, struct intr_irqsrc *isrc)
+{
+ struct aw_gpio_softc *sc;
+
+ sc = device_get_softc(dev);
+ aw_gpio_pic_disable_intr_locked(sc, isrc);
+}
+
+/*
+ * OFWBUS Interface
+ */
+static phandle_t
+aw_gpio_get_node(device_t dev, device_t bus)
+{
+
+ /* We only have one child, the GPIO bus, which needs our own node. */
+ return (ofw_bus_get_node(dev));
+}
+
static device_method_t aw_gpio_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, aw_gpio_probe),
DEVMETHOD(device_attach, aw_gpio_attach),
DEVMETHOD(device_detach, aw_gpio_detach),
+
+#ifdef INTRNG
+ /* Interrupt controller interface */
+ DEVMETHOD(pic_disable_intr, aw_gpio_pic_disable_intr),
+ DEVMETHOD(pic_enable_intr, aw_gpio_pic_enable_intr),
+ DEVMETHOD(pic_map_intr, aw_gpio_pic_map_intr),
+ DEVMETHOD(pic_setup_intr, aw_gpio_pic_setup_intr),
+ DEVMETHOD(pic_teardown_intr, aw_gpio_pic_teardown_intr),
+ DEVMETHOD(pic_post_filter, aw_gpio_pic_post_filter),
+ DEVMETHOD(pic_post_ithread, aw_gpio_pic_post_ithread),
+ DEVMETHOD(pic_pre_ithread, aw_gpio_pic_pre_ithread),
+#endif
/* GPIO protocol */
DEVMETHOD(gpio_get_bus, aw_gpio_get_bus),
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