summaryrefslogtreecommitdiff
path: root/drivers/spi
diff options
context:
space:
mode:
authorAndy Gross <agross@codeaurora.org>2014-06-12 23:34:10 +0400
committerMark Brown <broonie@linaro.org>2014-06-22 14:48:09 +0400
commit4a8573abe965115bc5b064401fd669b74e985258 (patch)
tree933fae200342e47c9bf596b31847e9477e093e38 /drivers/spi
parent045c243a511c8b688d36659cc3f781e84e9c2ddb (diff)
downloadlinux-4a8573abe965115bc5b064401fd669b74e985258.tar.xz
spi: qup: Remove chip select function
This patch removes the chip select function. Chip select should instead be supported using GPIOs, defining the DT entry "cs-gpios", and letting the SPI core assert/deassert the chip select as it sees fit. The chip select control inside the controller is buggy. It is supposed to automatically assert the chip select based on the activity in the controller, but it is buggy and doesn't work at all. So instead we elect to use GPIOs. Signed-off-by: Andy Gross <agross@codeaurora.org> Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-qup.c33
1 files changed, 6 insertions, 27 deletions
diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index e783e4ce2cdc..c08da380cb23 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -424,31 +424,6 @@ static int spi_qup_io_config(struct spi_device *spi, struct spi_transfer *xfer)
return 0;
}
-static void spi_qup_set_cs(struct spi_device *spi, bool enable)
-{
- struct spi_qup *controller = spi_master_get_devdata(spi->master);
-
- u32 iocontol, mask;
-
- iocontol = readl_relaxed(controller->base + SPI_IO_CONTROL);
-
- /* Disable auto CS toggle and use manual */
- iocontol &= ~SPI_IO_C_MX_CS_MODE;
- iocontol |= SPI_IO_C_FORCE_CS;
-
- iocontol &= ~SPI_IO_C_CS_SELECT_MASK;
- iocontol |= SPI_IO_C_CS_SELECT(spi->chip_select);
-
- mask = SPI_IO_C_CS_N_POLARITY_0 << spi->chip_select;
-
- if (enable)
- iocontol |= mask;
- else
- iocontol &= ~mask;
-
- writel_relaxed(iocontol, controller->base + SPI_IO_CONTROL);
-}
-
static int spi_qup_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
@@ -571,12 +546,16 @@ static int spi_qup_probe(struct platform_device *pdev)
return -ENOMEM;
}
+ /* use num-cs unless not present or out of range */
+ if (of_property_read_u16(dev->of_node, "num-cs",
+ &master->num_chipselect) ||
+ (master->num_chipselect > SPI_NUM_CHIPSELECTS))
+ master->num_chipselect = SPI_NUM_CHIPSELECTS;
+
master->bus_num = pdev->id;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
- master->num_chipselect = SPI_NUM_CHIPSELECTS;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
master->max_speed_hz = max_freq;
- master->set_cs = spi_qup_set_cs;
master->transfer_one = spi_qup_transfer_one;
master->dev.of_node = pdev->dev.of_node;
master->auto_runtime_pm = true;