[RFC v8 net-next 03/16] net: ocelot: add interface to get regmaps when exernally controlled

[Colin Foster <colin.foster@xxxxxxxxxxxxxxxx>]

Ocelot chips have several peripherals: pinctrl, sgpio, miim... If the chip
is in a configuration where it is being externally controlled via SPI, the
child device will need to request a resource from the parent.

Add the function call that will be used in those scenarios so that drivers
can be updated before the full functionality is added.

Signed-off-by: Colin Foster <colin.foster@xxxxxxxxxxxxxxxx>
---
 include/soc/mscc/ocelot.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/soc/mscc/ocelot.h b/include/soc/mscc/ocelot.h
index 8d8d46778f7e..1897119ebb9a 100644
--- a/include/soc/mscc/ocelot.h
+++ b/include/soc/mscc/ocelot.h
@@ -1039,4 +1039,11 @@ ocelot_mrp_del_ring_role(struct ocelot *ocelot, int port,
 }
 #endif
 
+static inline struct regmap *
+ocelot_init_regmap_from_resource(struct device *child,
+				 const struct resource *res)
+{
+	return ERR_PTR(-EOPNOTSUPP);
+}
+
 #endif
-- 
2.25.1