[PATCH v2 1/2] spi: Allow to have all native CSs in use along with GPIOs

[Andy Shevchenko]

The commit 7d93aecdb58d ("spi: Add generic support for unused native cs
with cs-gpios") excludes the valid case for the controllers that doesn't
need to switch native CS in order to perform the transfer, i.e. when

  0             native
  ...           ...
  <n> - 1       native
  <n>           GPIO
  <n> + 1       GPIO
  ...           ...

where <n> defines maximum of native CSs supported by the controller.

To allow this, bail out from spi_get_gpio_descs() conditionally for
the controllers which explicitly marked with SPI_MASTER_GPIO_SS.

Fixes: 7d93aecdb58d ("spi: Add generic support for unused native cs with 
cs-gpios")
Signed-off-by: Andy Shevchenko <andriy.shevche...@linux.intel.com>
---
v2: no changes
 drivers/spi/spi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 36c46feab6d4..9c3730a9f7d5 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -2610,8 +2610,9 @@ static int spi_get_gpio_descs(struct spi_controller *ctlr)
        }
 
        ctlr->unused_native_cs = ffz(native_cs_mask);
-       if (num_cs_gpios && ctlr->max_native_cs &&
-           ctlr->unused_native_cs >= ctlr->max_native_cs) {
+
+       if ((ctlr->flags & SPI_MASTER_GPIO_SS) && num_cs_gpios &&
+           ctlr->max_native_cs && ctlr->unused_native_cs >= 
ctlr->max_native_cs) {
                dev_err(dev, "No unused native chip select available\n");
                return -EINVAL;
        }
-- 
2.30.2