The macro REG gets defined in at least two locations -
drivers/pinctrl/pinctrl-ocelot.c and include/soc/mscc/ocelot.h. While
pinctrl-ocelot.c doesn't include include/soc/mscc/ocelot.h, it does in fact
include include/linux/mfd/ocelot.h.

This was all fine, until include/linux/mfd/ocelot.h needed resources from
include/soc/mscc/ocelot.h. At that point the REG macro becomes redefined,
and will throw a compiler error.

Undefine the REG macro in drivers/pinctrl/pinctrl-ocelot.c before it is
defined to avoid this error.

Signed-off-by: Colin Foster <colin.foster@in-advantage.com>
---

v3
    * No change

v2
    * New patch

---
 drivers/pinctrl/pinctrl-ocelot.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pinctrl/pinctrl-ocelot.c b/drivers/pinctrl/pinctrl-ocelot.c
index 62ce3957abe4..525c6ae898e2 100644
--- a/drivers/pinctrl/pinctrl-ocelot.c
+++ b/drivers/pinctrl/pinctrl-ocelot.c
@@ -1237,6 +1237,7 @@ static int lan966x_pinmux_set_mux(struct pinctrl_dev *pctldev,
 	return 0;
 }
 
+#undef REG
 #define REG(r, info, p) ((r) * (info)->stride + (4 * ((p) / 32)))
 
 static int ocelot_gpio_set_direction(struct pinctrl_dev *pctldev,
-- 
2.25.1