[PATCH v3] memory: omap-gpmc: Fix build error without CONFIG_OF

[YueHaibing]

If CONFIG_OF is n, gcc fails:

drivers/memory/omap-gpmc.o: In function `gpmc_omap_onenand_set_timings':
omap-gpmc.c:(.text+0x2a88): undefined reference to `gpmc_read_settings_dt'

Add gpmc_read_settings_dt() helper function, which zero the gpmc_settings
so the caller doesn't proceed with random/invalid settings.

Fixes: a758f50f10cf ("mtd: onenand: omap2: Configure driver from DT")
Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
---
v3: zero gpmc_settings
v2: add gpmc_read_settings_dt() stub
---
 drivers/memory/omap-gpmc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/memory/omap-gpmc.c b/drivers/memory/omap-gpmc.c
index cd9e80748591..e026b4cd3612 100644
--- a/drivers/memory/omap-gpmc.c
+++ b/drivers/memory/omap-gpmc.c
@@ -2310,6 +2310,10 @@ static void gpmc_probe_dt_children(struct platform_device *pdev)
 	}
 }
 #else
+void gpmc_read_settings_dt(struct device_node *np, struct gpmc_settings *p)
+{
+	memset(p, 0, sizeof(struct gpmc_settings));
+}
 static int gpmc_probe_dt(struct platform_device *pdev)
 {
 	return 0;
-- 
2.17.1