netdev - [PATCH net] Revert "net: stmmac: platform: Fix MDIO init for platforms without PHY"

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Date:   Mon,  6 Jan 2020 21:08:46 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     netdev@...r.kernel.org
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        tomeu.vizoso@...labora.com, khilman@...libre.com,
        "David S. Miller" <davem@...emloft.net>, mgalka@...labora.com,
        guillaume.tucker@...labora.com, broonie@...nel.org,
        Jayati Sahu <jayati.sahu@...sung.com>,
        Sriram Dash <sriram.dash@...sung.com>,
        Padmanabhan Rajanbabu <p.rajanbabu@...sung.com>,
        enric.balletbo@...labora.com, Jose Abreu <Jose.Abreu@...opsys.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-kernel@...r.kernel.org,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, heiko@...ech.de
Subject: [PATCH net] Revert "net: stmmac: platform: Fix MDIO init for platforms without PHY"

This reverts commit d3e014ec7d5ebe9644b5486bc530b91e62bbf624 ("net:
stmmac: platform: Fix MDIO init for platforms without PHY") because it
breaks existing systems with stmmac which do not have a MDIO bus
sub-node nor a 'phy-handle' property declared in their Device Tree. On
those systems, the stmmac MDIO bus is expected to be created and then
scanned by of_mdiobus_register() to create PHY devices.

While these systems should arguably make use of a more accurate Device
Tree reprensentation with the use of the MDIO bus sub-node an
appropriate 'phy-handle', we cannot break them, therefore restore the
behavior prior to the said commit.

Fixes: d3e014ec7d5e ("net: stmmac: platform: Fix MDIO init for platforms without PHY")
Reported-by: Heiko Stuebner <heiko@...ech.de>
Reported-by: kernelci.org bot <bot@...nelci.org>
Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
---
Heiko,

I did not add the Tested-by because the patch is a little bit different
from what you tested, even if you most likely were not hitting the other
part that I was changing. Thanks!

 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index cc8d7e7bf9ac..bedaff0c13bd 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -320,7 +320,7 @@ static int stmmac_mtl_setup(struct platform_device *pdev,
 static int stmmac_dt_phy(struct plat_stmmacenet_data *plat,
 			 struct device_node *np, struct device *dev)
 {
-	bool mdio = false;
+	bool mdio = true;
 	static const struct of_device_id need_mdio_ids[] = {
 		{ .compatible = "snps,dwc-qos-ethernet-4.10" },
 		{},
-- 
2.19.1