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

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Message-ID: <50db4ab4-ff7b-ca01-c266-d37ee02ac8f0@synopsys.com>
Date:   Tue, 21 Mar 2017 15:14:19 +0000
From:   Joao Pinto <Joao.Pinto@...opsys.com>
To:     Thierry Reding <thierry.reding@...il.com>,
        "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: Re: [PATCH 2/3] net: stmmac: Restore DT backwards-compatibility

Às 3:12 PM de 3/21/2017, Thierry Reding escreveu:
> 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;
> 

Acked-By: Joao Pinto <jpinto@...opsys.com>