[PATCH v1] spi: loopback-test: provide loop request option.

[Oleksij Rempel]

From: Oleksij Rempel <li...@rempel-privat.de>

Provide a module parameter to request internal
loop by the SPI master controller.
This should make loop testing easier without extra HW modification.

Signed-off-by: Oleksij Rempel <li...@rempel-privat.de>
---
 drivers/spi/spi-loopback-test.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/spi/spi-loopback-test.c b/drivers/spi/spi-loopback-test.c
index f4875f177df0..34e1544d7d0e 100644
--- a/drivers/spi/spi-loopback-test.c
+++ b/drivers/spi/spi-loopback-test.c
@@ -51,6 +51,14 @@ MODULE_PARM_DESC(loopback,
                 "is checked to match tx_buf after the spi_message "    \
                 "is executed");
 
+/* the device is jumpered for loopback - enabling some rx_buf tests */
+int loop_req;
+module_param(loop_req, int, 0);
+MODULE_PARM_DESC(loop_req,
+                "if set enable controller will be asked to enable "    \
+                "test loop mode. If supported, MISO and MOSI will be "  \
+                "jumpered by SPI controller");
+
 /* run only a specific test */
 int run_only_test = -1;
 module_param(run_only_test, int, 0);
@@ -313,6 +321,16 @@ static int spi_loopback_test_probe(struct spi_device *spi)
 {
        int ret;
 
+       if (loop_req) {
+               spi->mode = SPI_LOOP | spi->mode;
+               ret = spi_setup(spi);
+               if (ret) {
+                       dev_err(&spi->dev, "SPI setup wasn't successful %d\n", 
ret);
+                       dev_err(&spi->dev, "SPI_LOOP is not supported by SPI 
master.");
+                       return -ENODEV;
+               }
+       }
+
        dev_info(&spi->dev, "Executing spi-loopback-tests\n");
 
        ret = spi_test_run_tests(spi, spi_tests);
-- 
2.11.0