linux-kernel - Re: [PATCH v3 02/20] net: stmmac: add optional setup function

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Date:   Mon, 3 Apr 2017 14:32:33 +0200
From:   Giuseppe CAVALLARO <peppe.cavallaro@...com>
To:     Corentin Labbe <clabbe.montjoie@...il.com>, <robh+dt@...nel.org>,
        <mark.rutland@....com>, <maxime.ripard@...e-electrons.com>,
        <wens@...e.org>, <linux@...linux.org.uk>,
        <catalin.marinas@....com>, <will.deacon@....com>,
        <alexandre.torgue@...com>
CC:     <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 02/20] net: stmmac: add optional setup function

Hello Corentin

On 4/3/2017 11:14 AM, Corentin Labbe wrote:
> Instead of adding more ifthen logic for adding a new mac_device_info
> setup function, it is easier to add a function pointer to the function
> needed.
>
> Signed-off-by: Corentin Labbe <clabbe.montjoie@...il.com>
> ---
>   drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 4 +++-
>   include/linux/stmmac.h                            | 3 +++
>   2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> index 43361f3..3beca41 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
> @@ -3508,7 +3508,9 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
>   	struct mac_device_info *mac;
>   
>   	/* Identify the MAC HW device */
> -	if (priv->plat->has_gmac) {
> +	if (priv->plat->setup) {
> +		mac = priv->plat->setup(priv);
> +	} else if (priv->plat->has_gmac) {
>   		priv->dev->priv_flags |= IFF_UNICAST_FLT;
>   		mac = dwmac1000_setup(priv->ioaddr,
>   				      priv->plat->multicast_filter_bins,
> diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
> index 3921cb9..dadd74b 100644
> --- a/include/linux/stmmac.h
> +++ b/include/linux/stmmac.h
> @@ -144,6 +144,8 @@ struct stmmac_txq_cfg {
>   	u32 prio;
>   };
>   
> +struct stmmac_priv;
> +
>   struct plat_stmmacenet_data {
>   	int bus_id;
>   	int phy_addr;
> @@ -177,6 +179,7 @@ struct plat_stmmacenet_data {
>   	void (*fix_mac_speed)(void *priv, unsigned int speed);
>   	int (*init)(struct platform_device *pdev, void *priv);
>   	void (*exit)(struct platform_device *pdev, void *priv);
> +	struct mac_device_info *(*setup)(struct stmmac_priv *priv);

In that case  I prefer to have void *priv as done for the other callbacks.
I mean, keep the priv struct inside the driver part.

peppe

>   	void *bsp_priv;
>   	struct clk *stmmac_clk;
>   	struct clk *pclk;