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

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@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>

diff --git a/drivers/net/phy/meson-gxl.c b/drivers/net/phy/meson-gxl.c
index c49062ad72c6c6922e18a26c68c2d96627da906e..5e41658b1e2fa18c7362c26ca8df9c849d34eafc 100644 (file)
--- 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,
        },
 };