This change adds the following optional DT properties:
number-gpios: Number of GPIOs the device should expose
gpio-base: GPIO base that is registered with the kernel
firmware-gpio-base: GPIO bases as viewed by the firmware
The purpose of these DT nodes is to make the driver more
general.
Signed-off-by: Michael Zoran <mzo...@crowfest.net>
---
.../bcm2835-firmware-gpio/gpio-bcm-exp.c | 40 ++++++++++++++++------
1 file changed, 29 insertions(+), 11 deletions(-)
diff --git a/drivers/staging/vc04_services/bcm2835-firmware-gpio/gpio-bcm-exp.c
b/drivers/staging/vc04_services/bcm2835-firmware-gpio/gpio-bcm-exp.c
index ba9750107957..f6719c84ed8b 100644
--- a/drivers/staging/vc04_services/bcm2835-firmware-gpio/gpio-bcm-exp.c
+++ b/drivers/staging/vc04_services/bcm2835-firmware-gpio/gpio-bcm-exp.c
@@ -23,12 +23,15 @@
#include <soc/bcm2835/raspberrypi-firmware.h>
#define MODULE_NAME "brcmexp-gpio"
-#define NUM_GPIO 8
+#define DEFAULT_NUM_GPIO 8
+#define DEFAULT_GPIO_BASE 128
+#define DEFAULT_FIRMWARE_GPIO_BASE 128
struct brcmexp_gpio {
struct gpio_chip gc;
struct device *dev;
struct rpi_firmware *fw;
+ u32 firmware_gpio_base;
};
struct gpio_set_config {
@@ -58,7 +61,7 @@ static int brcmexp_gpio_get_polarity(struct gpio_chip *gc,
unsigned int off)
gpio = container_of(gc, struct brcmexp_gpio, gc);
- get.gpio = off + gpio->gc.base; /* GPIO to update */
+ get.gpio = off + gpio->firmware_gpio_base;
ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_CONFIG,
&get, sizeof(get));
@@ -78,7 +81,7 @@ static int brcmexp_gpio_dir_in(struct gpio_chip *gc, unsigned
int off)
gpio = container_of(gc, struct brcmexp_gpio, gc);
- set_in.gpio = off + gpio->gc.base; /* GPIO to update */
+ set_in.gpio = off + gpio->firmware_gpio_base;
set_in.direction = 0; /* Input */
set_in.polarity = brcmexp_gpio_get_polarity(gc, off);
/* Retain existing setting */
@@ -105,7 +108,7 @@ static int brcmexp_gpio_dir_out(struct gpio_chip *gc,
unsigned int off, int val)
gpio = container_of(gc, struct brcmexp_gpio, gc);
- set_out.gpio = off + gpio->gc.base; /* GPIO to update */
+ set_out.gpio = off + gpio->firmware_gpio_base;
set_out.direction = 1; /* Output */
set_out.polarity = brcmexp_gpio_get_polarity(gc, off);
/* Retain existing setting */
@@ -131,7 +134,7 @@ static int brcmexp_gpio_get_direction(struct gpio_chip *gc,
unsigned int off)
gpio = container_of(gc, struct brcmexp_gpio, gc);
- get.gpio = off + gpio->gc.base; /* GPIO to update */
+ get.gpio = off + gpio->firmware_gpio_base;
ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_CONFIG,
&get, sizeof(get));
@@ -151,7 +154,7 @@ static int brcmexp_gpio_get(struct gpio_chip *gc, unsigned
int off)
gpio = container_of(gc, struct brcmexp_gpio, gc);
- get.gpio = off + gpio->gc.base; /* GPIO to update */
+ get.gpio = off + gpio->firmware_gpio_base;
get.state = 0; /* storage for returned value */
ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_GET_GPIO_STATE,
@@ -172,9 +175,7 @@ static void brcmexp_gpio_set(struct gpio_chip *gc, unsigned
int off, int val)
gpio = container_of(gc, struct brcmexp_gpio, gc);
- off += gpio->gc.base;
-
- set.gpio = off + gpio->gc.base; /* GPIO to update */
+ set.gpio = off + gpio->firmware_gpio_base;
set.state = val; /* Output state */
ret = rpi_firmware_property(gpio->fw, RPI_FIRMWARE_SET_GPIO_STATE,
@@ -212,8 +213,8 @@ static int brcmexp_gpio_probe(struct platform_device *pdev)
ucb->gc.label = MODULE_NAME;
ucb->gc.owner = THIS_MODULE;
ucb->gc.of_node = np;
- ucb->gc.base = 128;
- ucb->gc.ngpio = NUM_GPIO;
+ ucb->gc.base = DEFAULT_GPIO_BASE;
+ ucb->gc.ngpio = DEFAULT_NUM_GPIO;
ucb->gc.direction_input = brcmexp_gpio_dir_in;
ucb->gc.direction_output = brcmexp_gpio_dir_out;
@@ -222,6 +223,23 @@ static int brcmexp_gpio_probe(struct platform_device *pdev)
ucb->gc.set = brcmexp_gpio_set;
ucb->gc.can_sleep = true;
+ ucb->firmware_gpio_base = DEFAULT_FIRMWARE_GPIO_BASE;
+
+ err = of_property_read_u16(dev->of_node, "number-gpios",
+ &ucb->gc.ngpio);
+ if (err)
+ dev_dbg(dev, "Failed to get DT property number-gpio");
+
+ err = of_property_read_u32(dev->of_node, "gpio-base",
+ &ucb->gc.base);
+ if (err)
+ dev_dbg(dev, "Failed to get DT property gpio-base");
+
+ err = of_property_read_u32(dev->of_node, "firmware-gpio-base",
+ &ucb->firmware_gpio_base);
+ if (err)
+ dev_dbg(dev, "Failed to get DT property firmware-gpio-base");
+
err = gpiochip_add(&ucb->gc);
if (err)
return err;
--
2.11.0
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