diff options
| author | Bhuvanchandra DV <bhuvanchandra.dv@toradex.com> | 2016-03-22 01:41:52 +0530 |
|---|---|---|
| committer | Stefan Agner <stefan.agner@toradex.com> | 2016-03-23 18:02:45 -0700 |
| commit | 539eb164ff4e64f4cc824437e9c96e71c526f1fb (patch) | |
| tree | 2572de1df21042c529c26fb5bf6a46a4b2095dc4 | |
| parent | f3dadeda06caec727f3ba1307e41c585c64d2799 (diff) | |
spi: fsl-dspi: Set max_speed_hz for master
Calculate and update max speed from bus clock for SoCs
using DSPI IP.
The bus clock factor's are taken from the data sheets
of respective SoCs.
Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@toradex.com>
Acked-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Mark Brown <broonie@kernel.org>
(cherry picked from commit 9419b2006cf47c75985ea51d36ddc51346d29efd)
| -rw-r--r-- | drivers/spi/spi-fsl-dspi.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c index 39412c9097c6..559ed70fd229 100644 --- a/drivers/spi/spi-fsl-dspi.c +++ b/drivers/spi/spi-fsl-dspi.c @@ -121,18 +121,22 @@ enum dspi_trans_mode { struct fsl_dspi_devtype_data { enum dspi_trans_mode trans_mode; + u8 max_clock_factor; }; static const struct fsl_dspi_devtype_data vf610_data = { .trans_mode = DSPI_EOQ_MODE, + .max_clock_factor = 2, }; static const struct fsl_dspi_devtype_data ls1021a_v1_data = { .trans_mode = DSPI_TCFQ_MODE, + .max_clock_factor = 8, }; static const struct fsl_dspi_devtype_data ls2085a_data = { .trans_mode = DSPI_TCFQ_MODE, + .max_clock_factor = 8, }; struct fsl_dspi { @@ -726,6 +730,9 @@ static int dspi_probe(struct platform_device *pdev) } clk_prepare_enable(dspi->clk); + master->max_speed_hz = + clk_get_rate(dspi->clk) / dspi->devtype_data->max_clock_factor; + init_waitqueue_head(&dspi->waitq); platform_set_drvdata(pdev, master); |