[RFC PATCH net-next v2 02/10] net: dsa: b53: prevent FAST_AGE access on BCM5325

["Álvaro Fernández Rojas" <noltari@gmail.com>]

BCM5325 doesn't implement FAST_AGE registers so we should avoid reading or
writing them.

Fixes: 967dd82ffc52 ("net: dsa: b53: Add support for Broadcom RoboSwitch")
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
 drivers/net/dsa/b53/b53_common.c | 9 +++++++++
 1 file changed, 9 insertions(+)

 v2: no changes.

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index feea531732c7b..525306193f80e 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -486,6 +486,9 @@ static int b53_flush_arl(struct b53_device *dev, u8 mask)
 {
 	unsigned int i;
 
+	if (is5325(dev))
+		return 0;
+
 	b53_write8(dev, B53_CTRL_PAGE, B53_FAST_AGE_CTRL,
 		   FAST_AGE_DONE | FAST_AGE_DYNAMIC | mask);
 
@@ -510,6 +513,9 @@ static int b53_flush_arl(struct b53_device *dev, u8 mask)
 
 static int b53_fast_age_port(struct b53_device *dev, int port)
 {
+	if (is5325(dev))
+		return 0;
+
 	b53_write8(dev, B53_CTRL_PAGE, B53_FAST_AGE_PORT_CTRL, port);
 
 	return b53_flush_arl(dev, FAST_AGE_PORT);
@@ -517,6 +523,9 @@ static int b53_fast_age_port(struct b53_device *dev, int port)
 
 static int b53_fast_age_vlan(struct b53_device *dev, u16 vid)
 {
+	if (is5325(dev))
+		return 0;
+
 	b53_write16(dev, B53_CTRL_PAGE, B53_FAST_AGE_VID_CTRL, vid);
 
 	return b53_flush_arl(dev, FAST_AGE_VLAN);
-- 
2.39.5