linux-kernel - Re: [PATCH RFC v2 07/11] net: stmmac: dwmac-meson8b: Make the clock enabling code re-usable

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Date:   Fri, 1 May 2020 17:37:25 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     robh+dt@...nel.org, f.fainelli@...il.com,
        linux-amlogic@...ts.infradead.org, devicetree@...r.kernel.org,
        jianxin.pan@...ogic.com, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RFC v2 07/11] net: stmmac: dwmac-meson8b: Make the clock
 enabling code re-usable

On Wed, Apr 29, 2020 at 10:16:40PM +0200, Martin Blumenstingl wrote:
> The timing adjustment clock will need similar logic as the RGMII clock:
> It has to be enabled in the driver conditionally and when the driver is
> unloaded it should be disabled again. Extract the existing code for the
> RGMII clock into a new function so it can be re-used.
> 
> Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> ---
>  .../ethernet/stmicro/stmmac/dwmac-meson8b.c   | 23 +++++++++++++++----
>  1 file changed, 18 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
> index 41f3ef6bea66..d31f79c455de 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-meson8b.c
> @@ -266,6 +266,22 @@ static int meson_axg_set_phy_mode(struct meson8b_dwmac *dwmac)
>  	return 0;
>  }
>  
> +static int meson8b_devm_clk_prepare_enable(struct meson8b_dwmac *dwmac,
> +					   struct clk *clk)
> +{
> +	int ret;
> +
> +	ret = clk_prepare_enable(clk);
> +	if (ret)
> +		return ret;
> +
> +	devm_add_action_or_reset(dwmac->dev,
> +				 (void(*)(void *))clk_disable_unprepare,
> +				 dwmac->rgmii_tx_clk);
> +
> +	return 0;
> +}

I'm surprised this does not exist in the core. It looks like there was
some discussion about this, but nothing merged.

Reviewed-by: Andrew Lunn <andrew@...n.ch>

    Andrew