linux-kernel - Re: [PATCH net-next v1 1/9] net: ethernet: mtk-star-emac: store bit_clk

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Date:   Tue, 25 Jan 2022 10:50:54 +0100
From:   Bartosz Golaszewski <brgl@...ev.pl>
To:     Biao Huang <biao.huang@...iatek.com>
Cc:     David Miller <davem@...emloft.net>,
        Rob Herring <robh+dt@...nel.org>,
        Fabien Parent <fparent@...libre.com>,
        Jakub Kicinski <kuba@...nel.org>, Felix Fietkau <nbd@....name>,
        John Crispin <john@...ozen.org>,
        Sean Wang <sean.wang@...iatek.com>,
        Mark Lee <Mark-MC.Lee@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        netdev <netdev@...r.kernel.org>,
        devicetree <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>,
        Yinghua Pan <ot_yinghua.pan@...iatek.com>,
        srv_heupstream@...iatek.com, Macpaul Lin <macpaul.lin@...iatek.com>
Subject: Re: [PATCH net-next v1 1/9] net: ethernet: mtk-star-emac: store
 bit_clk_div in compat structure

On Thu, Jan 20, 2022 at 8:02 AM Biao Huang <biao.huang@...iatek.com> wrote:
>
> From: Fabien Parent <fparent@...libre.com>
>
> Not all the SoC are using the same clock divider. Move the divider into
> a compat structure specific to the SoCs.
>
> Signed-off-by: Biao Huang <biao.huang@...iatek.com>
> Signed-off-by: Fabien Parent <fparent@...libre.com>
> ---
>  drivers/net/ethernet/mediatek/mtk_star_emac.c | 23 +++++++++++++++----
>  1 file changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/net/ethernet/mediatek/mtk_star_emac.c b/drivers/net/ethernet/mediatek/mtk_star_emac.c
> index 1d5dd2015453..26f5020f2e9c 100644
> --- a/drivers/net/ethernet/mediatek/mtk_star_emac.c
> +++ b/drivers/net/ethernet/mediatek/mtk_star_emac.c
> @@ -17,6 +17,7 @@
>  #include <linux/module.h>
>  #include <linux/netdevice.h>
>  #include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/of_mdio.h>
>  #include <linux/of_net.h>
>  #include <linux/platform_device.h>
> @@ -232,6 +233,10 @@ struct mtk_star_ring {
>         unsigned int tail;
>  };
>
> +struct mtk_star_compat {
> +       unsigned char bit_clk_div;
> +};
> +
>  struct mtk_star_priv {
>         struct net_device *ndev;
>
> @@ -257,6 +262,8 @@ struct mtk_star_priv {
>         int duplex;
>         int pause;
>
> +       const struct mtk_star_compat *compat_data;
> +
>         /* Protects against concurrent descriptor access. */
>         spinlock_t lock;
>
> @@ -899,7 +906,7 @@ static void mtk_star_init_config(struct mtk_star_priv *priv)
>         regmap_write(priv->regs, MTK_STAR_REG_SYS_CONF, val);
>         regmap_update_bits(priv->regs, MTK_STAR_REG_MAC_CLK_CONF,
>                            MTK_STAR_MSK_MAC_CLK_CONF,
> -                          MTK_STAR_BIT_CLK_DIV_10);
> +                          priv->compat_data->bit_clk_div);
>  }
>
>  static void mtk_star_set_mode_rmii(struct mtk_star_priv *priv)
> @@ -1461,6 +1468,7 @@ static int mtk_star_probe(struct platform_device *pdev)
>
>         priv = netdev_priv(ndev);
>         priv->ndev = ndev;
> +       priv->compat_data = of_device_get_match_data(&pdev->dev);
>         SET_NETDEV_DEV(ndev, dev);
>         platform_set_drvdata(pdev, ndev);
>
> @@ -1556,10 +1564,17 @@ static int mtk_star_probe(struct platform_device *pdev)
>         return devm_register_netdev(dev, ndev);
>  }
>
> +static struct mtk_star_compat mtk_star_mt8516_compat = {

static const ... ?

> +       .bit_clk_div = MTK_STAR_BIT_CLK_DIV_10,
> +};
> +
>  static const struct of_device_id mtk_star_of_match[] = {
> -       { .compatible = "mediatek,mt8516-eth", },
> -       { .compatible = "mediatek,mt8518-eth", },
> -       { .compatible = "mediatek,mt8175-eth", },
> +       { .compatible = "mediatek,mt8516-eth",
> +         .data = &mtk_star_mt8516_compat },
> +       { .compatible = "mediatek,mt8518-eth",
> +         .data = &mtk_star_mt8516_compat },
> +       { .compatible = "mediatek,mt8175-eth",
> +         .data = &mtk_star_mt8516_compat },
>         { }
>  };
>  MODULE_DEVICE_TABLE(of, mtk_star_of_match);
> --
> 2.25.1
>