spi: imx: set spi_bus_clk for mx21 and mx27

Introduce additional output parameter in spi_imx_clkdiv_1()
function to return result frequency and set it to spi_bus_clk.

This fixes division by zero bug, which occurred in
spi_imx_calculate_timeout() function.

Signed-off-by: Robert Baldyga <[e-mail]>
Signed-off-by: Mark Brown <[e-mail]>

drivers/spi/spi-imx.c

···
 
 /* MX21, MX27 */
 static unsigned int spi_imx_clkdiv_1(unsigned int fin,
-		unsigned int fspi, unsigned int max)
+		unsigned int fspi, unsigned int max, unsigned int *fres)
 {
 	int i;
 
 	for (i = 2; i < max; i++)
 		if (fspi * mxc_clkdivs[i] >= fin)
-			return i;
+			break;
 
-	return max;
+	*fres = fin / mxc_clkdivs[i];
+	return i;
 }
 
 /* MX1, MX31, MX35, MX51 CSPI */
···
 	struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
 	unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER;
 	unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18;
+	unsigned int clk;
 
-	reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) <<
-		MX21_CSPICTRL_DR_SHIFT;
+	reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max, &clk)
+		<< MX21_CSPICTRL_DR_SHIFT;
+	spi_imx->spi_bus_clk = clk;
+
 	reg |= config->bpw - 1;
 
 	if (spi->mode & SPI_CPHA)