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References: <20230407110356.8449-1-samin.guo@starfivetech.com> <20230407110356.8449-7-samin.guo@starfivetech.com>
In-Reply-To: <20230407110356.8449-7-samin.guo@starfivetech.com>
From:   Emil Renner Berthing <emil.renner.berthing@canonical.com>
Date:   Fri, 7 Apr 2023 21:16:22 +0200
Message-ID: <CAJM55Z9LF+p-jWQkPzK=0ovfrXN0b-E5Ed49sbC9xOdrH5SuKA@mail.gmail.com>
Subject: Re: [-net-next v11 6/6] net: stmmac: starfive-dmac: Add phy interface settings
To:     Samin Guo <samin.guo@starfivetech.com>
Cc:     linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org,
        devicetree@vger.kernel.org, netdev@vger.kernel.org,
        "David S . Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Emil Renner Berthing <kernel@esmil.dk>,
        Pedro Moreira <pmmoreir@synopsys.com>,
        Richard Cochran <richardcochran@gmail.com>,
        Conor Dooley <conor@kernel.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Andrew Lunn <andrew@lunn.ch>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Peter Geis <pgwipeout@gmail.com>,
        Yanhong Wang <yanhong.wang@starfivetech.com>,
        Tommaso Merciai <tomm.merciai@gmail.com>
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Hi Samin,

If you're respinning this series anyway, please use "net: stmmac:
dwmac-starfive:" to match the filename.

On Fri, 7 Apr 2023 at 13:05, Samin Guo <samin.guo@starfivetech.com> wrote:
>
> dwmac supports multiple modess. When working under rmii and rgmii,
> you need to set different phy interfaces.
>
> According to the dwmac document, when working in rmii, it needs to be
> set to 0x4, and rgmii needs to be set to 0x1.
>
> The phy interface needs to be set in syscon, the format is as follows:
> starfive,syscon: <&syscon, offset, shift>
>
> Tested-by: Tommaso Merciai <tomm.merciai@gmail.com>
> Signed-off-by: Samin Guo <samin.guo@starfivetech.com>
> ---
>  .../ethernet/stmicro/stmmac/dwmac-starfive.c  | 48 +++++++++++++++++++
>  1 file changed, 48 insertions(+)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
> index 4963d4008485..d6a1eddb51e8 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
> @@ -13,6 +13,10 @@
>
>  #include "stmmac_platform.h"
>
> +#define STARFIVE_DWMAC_PHY_INFT_RGMII  0x1
> +#define STARFIVE_DWMAC_PHY_INFT_RMII   0x4
> +#define STARFIVE_DWMAC_PHY_INFT_FIELD  0x7U
> +
>  struct starfive_dwmac {
>         struct device *dev;
>         struct clk *clk_tx;
> @@ -46,6 +50,46 @@ static void starfive_dwmac_fix_mac_speed(void *priv, unsigned int speed)
>                 dev_err(dwmac->dev, "failed to set tx rate %lu\n", rate);
>  }
>
> +static int starfive_dwmac_set_mode(struct plat_stmmacenet_data *plat_dat)
> +{
> +       struct starfive_dwmac *dwmac = plat_dat->bsp_priv;
> +       struct regmap *regmap;
> +       unsigned int args[2];
> +       unsigned int mode;
> +       int err;
> +
> +       switch (plat_dat->interface) {
> +       case PHY_INTERFACE_MODE_RMII:
> +               mode = STARFIVE_DWMAC_PHY_INFT_RMII;
> +               break;
> +
> +       case PHY_INTERFACE_MODE_RGMII:
> +       case PHY_INTERFACE_MODE_RGMII_ID:
> +               mode = STARFIVE_DWMAC_PHY_INFT_RGMII;
> +               break;
> +
> +       default:
> +               dev_err(dwmac->dev, "unsupported interface %d\n",
> +                       plat_dat->interface);
> +               return -EINVAL;
> +       }
> +
> +       regmap = syscon_regmap_lookup_by_phandle_args(dwmac->dev->of_node,
> +                                                     "starfive,syscon",
> +                                                     2, args);
> +       if (IS_ERR(regmap))
> +               return dev_err_probe(dwmac->dev, PTR_ERR(regmap), "syscon regmap failed\n");

This message is a bit misleading. It's not actually that the regmap
failed, but getting/looking up the regmap failed.

> +       /* args[0]:offset  args[1]: shift */
> +       err = regmap_update_bits(regmap, args[0],
> +                                STARFIVE_DWMAC_PHY_INFT_FIELD << args[1],
> +                                mode << args[1]);
> +       if (err)
> +               return dev_err_probe(dwmac->dev, err, "error setting phy mode\n");
> +
> +       return 0;
> +}
> +
>  static int starfive_dwmac_probe(struct platform_device *pdev)
>  {
>         struct plat_stmmacenet_data *plat_dat;
> @@ -91,6 +135,10 @@ static int starfive_dwmac_probe(struct platform_device *pdev)
>         plat_dat->bsp_priv = dwmac;
>         plat_dat->dma_cfg->dche = true;
>
> +       err = starfive_dwmac_set_mode(plat_dat);
> +       if (err)
> +               return err;
> +
>         err = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
>         if (err) {
>                 stmmac_remove_config_dt(pdev, plat_dat);
> --
> 2.17.1
>
>
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