driver: workaroud resource request that conflicts with errno PTR

broken since

commit ed6e965824303255cacc1c1a195d3684caa26bce
Author:     Sascha Hauer <s.hauer@pengutronix.de>
resource: Let dev_request_mem_region return an error pointer

Introduce dev_request_mem_region_err_null

only used on platform like at91 where the resource address conflicts
with errno PTR.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/driver.h b/include/driver.h
index 53e1000067..46aae4f433 100644
--- a/include/driver.h
+++ b/include/driver.h
@@ -206,6 +206,14 @@ void *dev_get_mem_region(struct device_d *dev, int num);
  */
 void __iomem *dev_request_mem_region(struct device_d *dev, int num);
 
+/*
+ * exlusively request register base 'num' for a device
+ * will return NULL on error
+ * only used on platform like at91 where the Ressource address collision with
+ * PTR errno
+ */
+void __iomem *dev_request_mem_region_err_null(struct device_d *dev, int num);
+
 struct device_d *device_alloc(const char *devname, int id);
 
 int device_add_resources(struct device_d *dev, const struct resource *res, int num);