MTD: MIPS: lantiq: verify that the NOR interface is available on falcon soc

When running on a FALC-ON SoC, we need to check the bootstrap options to see
if NOR is available.

Signed-off-by: John Crispin <blogic@openwrt.org>
Acked-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Cc: linux-mtd@lists.infradead.org
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3815/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/mtd/maps/lantiq-flash.c b/drivers/mtd/maps/lantiq-flash.c
index aefa11121674..c03456f17004 100644
--- a/drivers/mtd/maps/lantiq-flash.c
+++ b/drivers/mtd/maps/lantiq-flash.c
@@ -19,6 +19,7 @@
 #include <linux/mtd/cfi.h>
 #include <linux/platform_device.h>
 #include <linux/mtd/physmap.h>
+#include <linux/of.h>
 
 #include <lantiq_soc.h>
 
@@ -116,6 +117,12 @@ ltq_mtd_probe(struct platform_device *pdev)
         struct cfi_private *cfi;
         int err;
 
+        if (of_machine_is_compatible("lantiq,falcon") &&
+                        (ltq_boot_select() != BS_FLASH)) {
+                dev_err(&pdev->dev, "invalid bootstrap options\n");
+                return -ENODEV;
+        }
+
         ltq_mtd = kzalloc(sizeof(struct ltq_mtd), GFP_KERNEL);
         platform_set_drvdata(pdev, ltq_mtd);