spi: imx: set spi_bus_clk for mx1, mx31 and mx35
Modify spi_imx_clkdiv_2() to return the resulting bus clock frequency
when the selected clock divider is applied. Set spi_imx->spi_bus_clk to
this frequency.
If spi_bus_clk is unset, spi_imx_calculate_timeout() causes a
division by 0.
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c
index f63cb30..5cc72be 100644
--- a/drivers/spi/spi-imx.c
+++ b/drivers/spi/spi-imx.c
@@ -186,17 +186,19 @@
/* MX1, MX31, MX35, MX51 CSPI */
static unsigned int spi_imx_clkdiv_2(unsigned int fin,
- unsigned int fspi)
+ unsigned int fspi, unsigned int *fres)
{
int i, div = 4;
for (i = 0; i < 7; i++) {
if (fspi * div >= fin)
- return i;
+ goto out;
div <<= 1;
}
- return 7;
+out:
+ *fres = fin / div;
+ return i;
}
static int spi_imx_bytes_per_word(const int bpw)
@@ -482,9 +484,11 @@
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER;
+ unsigned int clk;
- reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
+ reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz, &clk) <<
MX31_CSPICTRL_DR_SHIFT;
+ spi_imx->spi_bus_clk = clk;
if (is_imx35_cspi(spi_imx)) {
reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
@@ -625,9 +629,12 @@
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER;
+ unsigned int clk;
- reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) <<
+ reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz, &clk) <<
MX1_CSPICTRL_DR_SHIFT;
+ spi_imx->spi_bus_clk = clk;
+
reg |= config->bpw - 1;
if (spi->mode & SPI_CPHA)