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authorDaniel Mack <zonque@gmail.com>2012-09-05 11:04:35 +0200
committerMark Brown <broonie@opensource.wolfsonmicro.com>2012-09-06 07:41:05 +0800
commit161c2dd3ca143f0dca50d72292bf651eabe2aa23 (patch)
tree812954905794b2eececd3f06f091757f6d4236eb /drivers/spi
parent9a2a52452575a4edf5b91e341d7d87fe2be3474c (diff)
downloadlinux-linaro-stable-161c2dd3ca143f0dca50d72292bf651eabe2aa23.tar.gz
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>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-gpio.c34
1 files changed, 24 insertions, 10 deletions
diff --git a/drivers/spi/spi-gpio.c b/drivers/spi/spi-gpio.c
index 0b56cfc71fab..ff7263ce12c7 100644
--- a/drivers/spi/spi-gpio.c
+++ b/drivers/spi/spi-gpio.c
@@ -46,6 +46,7 @@ struct spi_gpio {
struct spi_bitbang bitbang;
struct spi_gpio_platform_data pdata;
struct platform_device *pdev;
+ int cs_gpios[0];
};
/*----------------------------------------------------------------------*/
@@ -89,15 +90,21 @@ struct spi_gpio {
/*----------------------------------------------------------------------*/
-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 u32 spi_gpio_spec_txrx_word_mode3(struct spi_device *spi,
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 void spi_gpio_chipselect(struct spi_device *spi, int is_active)
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 @@ static int spi_gpio_setup(struct spi_device *spi)
!(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 int spi_gpio_setup(struct spi_device *spi)
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 @@ static int __devinit spi_gpio_probe(struct platform_device *pdev)
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;