spi/mcspi: allow configuration of pin directions

Allow D0 to be an input and D1 to be an output, configurable via
platform data and a new DT property.

Based on a patch from  Matus Ujhelyi <matus.ujhelyi@streamunlimited.com>

Signed-off-by: Daniel Mack <zonque@gmail.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 18 insertions, 7 deletions

diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index 3542fdc664b..51046332677 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -130,6 +130,7 @@ struct omap2_mcspi {
         struct omap2_mcspi_dma  *dma_channels;
         struct device           *dev;
         struct omap2_mcspi_regs ctx;
+        unsigned int            pin_dir:1;
 };
 
 struct omap2_mcspi_cs {
@@ -765,8 +766,15 @@ static int omap2_mcspi_setup_transfer(struct spi_device *spi,
         /* standard 4-wire master mode:  SCK, MOSI/out, MISO/in, nCS
          * REVISIT: this controller could support SPI_3WIRE mode.
          */
-        l &= ~(OMAP2_MCSPI_CHCONF_IS|OMAP2_MCSPI_CHCONF_DPE1);
-        l |= OMAP2_MCSPI_CHCONF_DPE0;
+        if (mcspi->pin_dir == MCSPI_PINDIR_D0_OUT_D1_IN) {
+                l &= ~OMAP2_MCSPI_CHCONF_IS;
+                l &= ~OMAP2_MCSPI_CHCONF_DPE1;
+                l |= OMAP2_MCSPI_CHCONF_DPE0;
+        } else {
+                l |= OMAP2_MCSPI_CHCONF_IS;
+                l |= OMAP2_MCSPI_CHCONF_DPE1;
+                l &= ~OMAP2_MCSPI_CHCONF_DPE0;
+        }
 
         /* wordlength */
         l &= ~OMAP2_MCSPI_CHCONF_WL_MASK;
@@ -1167,6 +1175,11 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
         master->cleanup = omap2_mcspi_cleanup;
         master->dev.of_node = node;
 
+        dev_set_drvdata(&pdev->dev, master);
+
+        mcspi = spi_master_get_devdata(master);
+        mcspi->master = master;
+
         match = of_match_device(omap_mcspi_of_match, &pdev->dev);
         if (match) {
                 u32 num_cs = 1; /* default number of chipselect */
@@ -1175,19 +1188,17 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
                 of_property_read_u32(node, "ti,spi-num-cs", &num_cs);
                 master->num_chipselect = num_cs;
                 master->bus_num = bus_num++;
+                if (of_get_property(node, "ti,pindir-d0-in-d1-out", NULL))
+                        mcspi->pin_dir = MCSPI_PINDIR_D0_IN_D1_OUT;
         } else {
                 pdata = pdev->dev.platform_data;
                 master->num_chipselect = pdata->num_cs;
                 if (pdev->id != -1)
                         master->bus_num = pdev->id;
+                mcspi->pin_dir = pdata->pin_dir;
         }
         regs_offset = pdata->regs_offset;
 
-        dev_set_drvdata(&pdev->dev, master);
-
-        mcspi = spi_master_get_devdata(master);
-        mcspi->master = master;
-
         r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
         if (r == NULL) {
                 status = -ENODEV;