Commit 15ca9215 authored by Martin Kaiser's avatar Martin Kaiser Committed by Mark Brown
Browse files

spi: imx: support loopback mode on imx35 



imx35 and compatible chipsets support loopback mode by setting a
loopback control bit in the test register. Make this setting available
for data transfers, similar to what we do for imx51.

Signed-off-by: default avatarMartin Kaiser <martin@kaiser.cx>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 2636ba8f

drivers/spi/spi-imx.c

+11 −1
Original line number Diff line number Diff line
@@ -455,6 +455,9 @@ static void mx51_ecspi_reset(struct spi_imx_data *spi_imx) 
#define MX31_CSPISTATUS		0x14

#define MX31_STATUS_RR		(1 << 3)



#define MX31_CSPI_TESTREG	0x1C

#define MX31_TEST_LBC		(1 << 14)



/* These functions also work for the i.MX35, but be aware that

 * the i.MX35 has a slightly different register layout for bits

 * we do not use here.
@@ -510,6 +513,13 @@ static int mx31_config(struct spi_device *spi, struct spi_imx_config *config) 


	writel(reg, spi_imx->base + MXC_CSPICTRL);



	reg = readl(spi_imx->base + MX31_CSPI_TESTREG);

	if (spi->mode & SPI_LOOP)

		reg |= MX31_TEST_LBC;

	else

		reg &= ~MX31_TEST_LBC;

	writel(reg, spi_imx->base + MX31_CSPI_TESTREG);



	return 0;

}
@@ -1186,7 +1196,7 @@ static int spi_imx_probe(struct platform_device *pdev) 
	spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;

	spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;

	spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;

	if (is_imx51_ecspi(spi_imx))

	if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx))

		spi_imx->bitbang.master->mode_bits |= SPI_LOOP;



	init_completion(&spi_imx->xfer_done);