netdev - [PATCH v3] net: phy: meson-gxl: Add generic dummy stubs for MMD register access

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Message-Id: <20230130231402.471493-1-cphealy@gmail.com>
Date:   Mon, 30 Jan 2023 15:14:02 -0800
From:   Chris Healy <cphealy@...il.com>
To:     cphealy@...il.com, andrew@...n.ch, hkallweit1@...il.com,
        linux@...linux.org.uk, davem@...emloft.net,
        neil.armstrong@...aro.org, khilman@...libre.com,
        netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org,
        jeremy.wang@...ogic.com
Cc:     Chris Healy <healych@...zon.com>
Subject: [PATCH v3] net: phy: meson-gxl: Add generic dummy stubs for MMD register access

From: Chris Healy <healych@...zon.com>

The Meson G12A Internal PHY does not support standard IEEE MMD extended
register access, therefore add generic dummy stubs to fail the read and
write MMD calls. This is necessary to prevent the core PHY code from
erroneously believing that EEE is supported by this PHY even though this
PHY does not support EEE, as MMD register access returns all FFFFs.

Fixes: 5c3407abb338 ("net: phy: meson-gxl: add g12a support")
Reviewed-by: Heiner Kallweit <hkallweit1@...il.com>
Signed-off-by: Chris Healy <healych@...zon.com>

---

Changes in v3:
* Add reviewed-by
Change in v2:
* Add fixes tag

 drivers/net/phy/meson-gxl.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/phy/meson-gxl.c b/drivers/net/phy/meson-gxl.c
index c49062ad72c6..5e41658b1e2f 100644
--- a/drivers/net/phy/meson-gxl.c
+++ b/drivers/net/phy/meson-gxl.c
@@ -271,6 +271,8 @@ static struct phy_driver meson_gxl_phy[] = {
 		.handle_interrupt = meson_gxl_handle_interrupt,
 		.suspend        = genphy_suspend,
 		.resume         = genphy_resume,
+		.read_mmd	= genphy_read_mmd_unsupported,
+		.write_mmd	= genphy_write_mmd_unsupported,
 	},
 };
 
-- 
2.39.1