mtd: nand: denali: set DEVICES_CONNECTED 1 if not set

Currently, the driver expects DEVICE_CONNECTED is automatically set
by the hardware, but this feature is disabled in some cases.
In such cases, it is the software's responsibility to set up the
DEVICES_CONNECTED register.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index e1c45bf2656d..b442a3ed9f0f 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c
@@ -1417,6 +1417,15 @@ static int denali_multidev_fixup(struct denali_nand_info *denali)
          */
         denali->devnum = ioread32(denali->flash_reg + DEVICES_CONNECTED);
 
+        /*
+         * On some SoCs, DEVICES_CONNECTED is not auto-detected.
+         * For those, DEVICES_CONNECTED is left to 0.  Set 1 if it is the case.
+         */
+        if (denali->devnum == 0) {
+                denali->devnum = 1;
+                iowrite32(1, denali->flash_reg + DEVICES_CONNECTED);
+        }
+
         if (denali->devnum == 1)
                 return 0;