spi: spi-gpio: store chipselect information in private structure
The spi-gpio driver currently assumes the chipselect gpio number is
stored in ->controller_data of the device's static board information.
In devicetree environments, this information is unavailable and has to
be derived from the DT node.
This patch moves the gpio storage to the controller's private data so
the DT bindings can easily build upon the driver.
Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index 0b56cfc..ff7263c 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -46,6 +46,7 @@
struct spi_bitbang bitbang;
struct spi_gpio_platform_data pdata;
struct platform_device *pdev;
+ int cs_gpios[0];
};
/*----------------------------------------------------------------------*/
@@ -89,15 +90,21 @@
/*----------------------------------------------------------------------*/
-static inline const struct spi_gpio_platform_data * __pure
-spi_to_pdata(const struct spi_device *spi)
+static inline struct spi_gpio * __pure
+spi_to_spi_gpio(const struct spi_device *spi)
{
const struct spi_bitbang *bang;
- const struct spi_gpio *spi_gpio;
+ struct spi_gpio *spi_gpio;
bang = spi_master_get_devdata(spi->master);
spi_gpio = container_of(bang, struct spi_gpio, bitbang);
- return &spi_gpio->pdata;
+ return spi_gpio;
+}
+
+static inline struct spi_gpio_platform_data * __pure
+spi_to_pdata(const struct spi_device *spi)
+{
+ return &spi_to_spi_gpio(spi)->pdata;
}
/* this is #defined to avoid unused-variable warnings when inlining */
@@ -210,7 +217,8 @@
static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
{
- unsigned long cs = (unsigned long) spi->controller_data;
+ struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
+ unsigned int cs = spi_gpio->cs_gpios[spi->chip_select];
/* set initial clock polarity */
if (is_active)
@@ -224,8 +232,9 @@
static int spi_gpio_setup(struct spi_device *spi)
{
- unsigned long cs = (unsigned long) spi->controller_data;
- int status = 0;
+ unsigned int cs = (unsigned int) spi->controller_data;
+ int status = 0;
+ struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
if (spi->bits_per_word > 32)
return -EINVAL;
@@ -239,8 +248,11 @@
!(spi->mode & SPI_CS_HIGH));
}
}
- if (!status)
+ if (!status) {
status = spi_bitbang_setup(spi);
+ spi_gpio->cs_gpios[spi->chip_select] = cs;
+ }
+
if (status) {
if (!spi->controller_state && cs != SPI_GPIO_NO_CHIPSELECT)
gpio_free(cs);
@@ -250,7 +262,8 @@
static void spi_gpio_cleanup(struct spi_device *spi)
{
- unsigned long cs = (unsigned long) spi->controller_data;
+ struct spi_gpio *spi_gpio = spi_to_spi_gpio(spi);
+ unsigned int cs = spi_gpio->cs_gpios[spi->chip_select];
if (cs != SPI_GPIO_NO_CHIPSELECT)
gpio_free(cs);
@@ -331,7 +344,8 @@
if (status < 0)
return status;
- master = spi_alloc_master(&pdev->dev, sizeof *spi_gpio);
+ master = spi_alloc_master(&pdev->dev, sizeof(*spi_gpio) +
+ (sizeof(int) * SPI_N_CHIPSEL));
if (!master) {
status = -ENOMEM;
goto gpio_free;