redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

spi/ath79: avoid multiple initialization of the SPI controller 

Currently we are initializing the SPI controller in
the chip select line function, and that function is
called once for each SPI device on the bus. If a
board has multiple SPI devices, the controller will
be initialized multiple times.

Introduce ath79_spi_{en,dis}able helper functions,
and call those from probe/response in order to avoid
the mutliple initialization of the controller.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
hifive-unleashed-5.1
Gabor Juhos 2012-12-27 10:42:28 +01:00 committed by Grant Likely
parent 95d79419fe
commit c4a31f4300
1 changed files with 24 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
drivers/spi/spi-ath79.c
View File

@ -96,16 +96,8 @@ static void ath79_spi_chipselect(struct spi_device *spi, int is_active)
}
static int ath79_spi_setup_cs(struct spi_device *spi)
static void ath79_spi_enable(struct ath79_spi *sp)
{
struct ath79_spi *sp = ath79_spidev_to_sp(spi);
struct ath79_spi_controller_data *cdata;
int status;
cdata = spi->controller_data;
if (spi->chip_select && !cdata)
return -EINVAL;
/* enable GPIO mode */
ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
@ -115,6 +107,24 @@ static int ath79_spi_setup_cs(struct spi_device *spi)
/* TODO: setup speed? */
ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);
}
static void ath79_spi_disable(struct ath79_spi *sp)
{
/* restore CTRL register */
ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
/* disable GPIO mode */
ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
}
static int ath79_spi_setup_cs(struct spi_device *spi)
{
struct ath79_spi_controller_data *cdata;
int status;
cdata = spi->controller_data;
if (spi->chip_select && !cdata)
return -EINVAL;
status = 0;
if (spi->chip_select) {
@ -135,17 +145,10 @@ static int ath79_spi_setup_cs(struct spi_device *spi)
static void ath79_spi_cleanup_cs(struct spi_device *spi)
{
struct ath79_spi *sp = ath79_spidev_to_sp(spi);
if (spi->chip_select) {
struct ath79_spi_controller_data *cdata = spi->controller_data;
gpio_free(cdata->gpio);
}
/* restore CTRL register */
ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, sp->reg_ctrl);
/* disable GPIO mode */
ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
}
static int ath79_spi_setup(struct spi_device *spi)
@ -268,12 +271,15 @@ static int ath79_spi_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "register read/write delay is %u nsecs\n",
sp->rrw_delay);
ath79_spi_enable(sp);
ret = spi_bitbang_start(&sp->bitbang);
if (ret)
goto err_clk_disable;
goto err_disable;
return 0;
err_disable:
ath79_spi_disable(sp);
err_clk_disable:
clk_disable(sp->clk);
err_clk_put:
@ -292,6 +298,7 @@ static int ath79_spi_remove(struct platform_device *pdev)
struct ath79_spi *sp = platform_get_drvdata(pdev);
spi_bitbang_stop(&sp->bitbang);
ath79_spi_disable(sp);
clk_disable(sp->clk);
clk_put(sp->clk);
iounmap(sp->base);