net: phy: meson-gxl: Add generic dummy stubs for MMD register access

[ Upstream commit afc2336f89dc0fc0ef25b92366814524b0fd90fb ]

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: dd8903216ac4 ("net: phy: meson-gxl: add g12a support")
Reviewed-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Chris Healy <healych@amazon.com>
Reviewed-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20230130231402.471493-1-cphealy@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/phy/meson-gxl.c b/drivers/net/phy/meson-gxl.c
index e8f2ca625837f3e8abaed3274bab41cf74c6b552..f7a9e6599a64297cdef2837a7445d56f6b4a9a0c 100644 (file)
--- a/drivers/net/phy/meson-gxl.c
+++ b/drivers/net/phy/meson-gxl.c
@@ -245,6 +245,8 @@ static struct phy_driver meson_gxl_phy[] = {
                .config_intr    = meson_gxl_config_intr,
                .suspend        = genphy_suspend,
                .resume         = genphy_resume,
+               .read_mmd       = genphy_read_mmd_unsupported,
+               .write_mmd      = genphy_write_mmd_unsupported,
        },
 };