linux-kernel - Re: [PATCH 1/2] net-next: stmmac: mediatek: add more suuport for RMII

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Date:   Thu, 12 Dec 2019 14:25:20 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     Biao Huang <biao.huang@...iatek.com>
Cc:     davem@...emloft.net, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, yt.shen@...iatek.com
Subject: Re: [PATCH 1/2] net-next: stmmac: mediatek: add more suuport for RMII

On Thu, Dec 12, 2019 at 10:41:44AM +0800, Biao Huang wrote:
> MT2712 SoC can provide the rmii reference clock, and the clock
> will output from TXC pin only, which means ref_clk pin of external
> PHY should connect to TXC pin in this case.
> Add corresponding clock and timing settings.

Hi Biao

Subject line has a typo.

> @@ -278,6 +296,7 @@ static int mediatek_dwmac_config_dt(struct mediatek_dwmac_plat_data *plat)
>  	mac_delay->tx_inv = of_property_read_bool(plat->np, "mediatek,txc-inverse");
>  	mac_delay->rx_inv = of_property_read_bool(plat->np, "mediatek,rxc-inverse");
>  	plat->rmii_rxc = of_property_read_bool(plat->np, "mediatek,rmii-rxc");
> +	plat->rmii_clk_from_mac = of_property_read_bool(plat->np, "mediatek,rmii-clk-from-mac");
>  
>  	return 0;
>  }
> @@ -287,6 +306,16 @@ static int mediatek_dwmac_clk_init(struct mediatek_dwmac_plat_data *plat)
>  	const struct mediatek_dwmac_variant *variant = plat->variant;
>  	int i, num = variant->num_clks;
>  
> +	plat->mac_rmii_clk = NULL;
> +	if (plat->phy_mode == PHY_INTERFACE_MODE_RMII &&
> +	    plat->rmii_clk_from_mac) {
> +		plat->mac_rmii_clk = devm_clk_get(plat->dev, "rmii_internal");
> +		if (IS_ERR(plat->mac_rmii_clk)) {
> +			dev_err(plat->dev, "Failed to get reference clk from MAC\n");
> +			return PTR_ERR(plat->mac_rmii_clk);
> +		}
> +	}

Please don't use a binary property. This is a clock, so describe it in
DT as a clock. Add it to the existing list of clocks.

   Andrew