linux-kernel - [PATCH 2/3] net: stmmac: Restore DT backwards-compatibility

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Message-Id: <20170321151211.31841-2-thierry.reding@gmail.com>
Date:   Tue, 21 Mar 2017 16:12:10 +0100
From:   Thierry Reding <thierry.reding@...il.com>
To:     "David S . Miller" <davem@...emloft.net>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        LABBE Corentin <clabbe.montjoie@...il.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] net: stmmac: Restore DT backwards-compatibility

From: Thierry Reding <treding@...dia.com>

Recent changes to support multiple queues in the device tree bindings
resulted in the number of RX and TX queues to be initialized to zero for
device trees not adhering to the new bindings.

Restore backwards-compatibility with those device trees by falling back
to a single RX and TX queues each.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 37f550ae76a5..74b0aff79b25 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -143,6 +143,13 @@ static void stmmac_mtl_setup(struct platform_device *pdev,
 	struct device_node *tx_node;
 	u8 queue = 0;
 
+	/* For backwards-compatibility with device trees that don't have any
+	 * snps,mtl-rx-config or snps,mtl-tx-config properties, we fall back
+	 * to one RX and TX queues each.
+	 */
+	plat->rx_queues_to_use = 1;
+	plat->tx_queues_to_use = 1;
+
 	rx_node = of_parse_phandle(pdev->dev.of_node, "snps,mtl-rx-config", 0);
 	if (!rx_node)
 		return;
-- 
2.12.0