[RFC PATCH net-next v2 06/10] net: dsa: b53: prevent BRCM_HDR access on BCM5325

[Álvaro Fernández Rojas]

BCM5325 doesn't implement BRCM_HDR register so we should avoid reading or
writing it.

Fixes: b409a9efa183 ("net: dsa: b53: Move Broadcom header setup to b53")
Signed-off-by: Álvaro Fernández Rojas <noltari@xxxxxxxxx>
Reviewed-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
---
 drivers/net/dsa/b53/b53_common.c | 4 ++++
 1 file changed, 4 insertions(+)

 v2: no changes.

diff --git a/drivers/net/dsa/b53/b53_common.c b/drivers/net/dsa/b53/b53_common.c
index 143c213a1992c..693a44150395e 100644
--- a/drivers/net/dsa/b53/b53_common.c
+++ b/drivers/net/dsa/b53/b53_common.c
@@ -729,6 +729,10 @@ void b53_brcm_hdr_setup(struct dsa_switch *ds, int port)
 		hdr_ctl |= GC_FRM_MGMT_PORT_M;
 	b53_write8(dev, B53_MGMT_PAGE, B53_GLOBAL_CONFIG, hdr_ctl);
 
+	/* B53_BRCM_HDR not present on BCM5325 */
+	if (is5325(dev))
+		return;
+
 	/* Enable Broadcom tags for IMP port */
 	b53_read8(dev, B53_MGMT_PAGE, B53_BRCM_HDR, &hdr_ctl);
 	if (tag_en)
-- 
2.39.5