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| author | Geert Uytterhoeven <geert+renesas@linux-m68k.org> | 2014-02-20 15:43:04 +0100 |
|---|---|---|
| committer | Stephane Desneux <stephane.desneux@open.eurogiciel.org> | 2015-02-04 11:13:35 +0100 |
| commit | 892d362869d4f1b776b4afa196b17eba63be5ea7 (patch) | |
| tree | c641bb058896cee343317e4bb3d333c3d184995a /drivers | |
| parent | 63d0cbb5e219c395511e350be6e6647881458204 (diff) | |
| download | linux-stable-892d362869d4f1b776b4afa196b17eba63be5ea7.tar.gz linux-stable-892d362869d4f1b776b4afa196b17eba63be5ea7.tar.bz2 linux-stable-892d362869d4f1b776b4afa196b17eba63be5ea7.zip | |
spi: sh-msiof: Use the core cs_gpio field, and make it optional
In current implementation, CS is controlled by GPIO, which is passed
through spi->controller_data. However, the MSIOF HW module has a function
to output CS by itself, which is already enabled and actual switch will be
done by pinmux.
Store the GPIO number in the core cs_gpio field, and ignore it if it is
an invalid (negative) GPIO number.
Loosely based on a patch from Takashi Yoshii <takasi-y@ops.dti.ne.jp>.
Signed-off-by: Geert Uytterhoeven <geert+renesas@linux-m68k.org>
Signed-off-by: Mark Brown <broonie@linaro.org>
(cherry picked from commit 8d19534a8d539bb2e598e56e017a423f205e909e)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/spi-sh-msiof.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c index 79e14586049b..92515c1ececa 100644 --- a/drivers/spi/spi-sh-msiof.c +++ b/drivers/spi/spi-sh-msiof.c @@ -445,6 +445,21 @@ static int sh_msiof_spi_setup_transfer(struct spi_device *spi, return spi_bitbang_setup_transfer(spi, t); } +static int sh_msiof_spi_setup(struct spi_device *spi) +{ + struct device_node *np = spi->master->dev.of_node; + + if (!np) { + /* + * Use spi->controller_data for CS (same strategy as spi_gpio), + * if any. otherwise let HW control CS + */ + spi->cs_gpio = (uintptr_t)spi->controller_data; + } + + return spi_bitbang_setup(spi); +} + static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on) { struct sh_msiof_spi_priv *p = spi_master_get_devdata(spi->master); @@ -470,8 +485,8 @@ static void sh_msiof_spi_chipselect(struct spi_device *spi, int is_on) !!(spi->mode & SPI_CS_HIGH)); } - /* use spi->controller data for CS (same strategy as spi_gpio) */ - gpio_set_value((uintptr_t)spi->controller_data, value); + if (spi->cs_gpio >= 0) + gpio_set_value(spi->cs_gpio, value); if (is_on == BITBANG_CS_INACTIVE) { if (test_and_clear_bit(0, &p->flags)) { @@ -758,7 +773,7 @@ static int sh_msiof_spi_probe(struct platform_device *pdev) master->bus_num = pdev->id; master->dev.of_node = pdev->dev.of_node; master->num_chipselect = p->info->num_chipselect; - master->setup = spi_bitbang_setup; + master->setup = sh_msiof_spi_setup; master->cleanup = spi_bitbang_cleanup; p->bitbang.master = master; |