[PATCH] spi: fsl-dspi: Set max_speed_hz for master
From: Bhuvanchandra DV
Date: Mon Mar 21 2016 - 16:12:22 EST
Calculate and update max speed from bus clock for SoC's
using DSPI IP.
The bus clock factor's are taken from the data sheet's
of respective SoC's.
Signed-off-by: Bhuvanchandra DV <bhuvanchandra.dv@xxxxxxxxxxx>
---
drivers/spi/spi-fsl-dspi.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index 59a1143..8753276 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);
--
2.7.3