Re: [PATCH v8 6/6] net: stmmac: starfive_dmac: Add phy interface settings

Emil Renner Berthing
2023-03-24T13:59:52Z

On Fri, 24 Mar 2023 at 03:30, 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 | 47 +++++++++++++++++++
> 1 file changed, 47 insertions(+)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
> index ef5a769b1c75..84690c8f0250 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;
> @@ -44,6 +48,43 @@ 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;
> +
> + 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)) {
> + dev_err(dwmac->dev, "syscon regmap failed.\n");
> + return -ENXIO;
> + }
> +
> + /* args[0]:offset args[1]: shift */
> + return regmap_update_bits(regmap, args[0],
> + STARFIVE_DWMAC_PHY_INFT_FIELD << args[1],
> + mode << args[1]);
> +}
> +
> static int starfive_dwmac_probe(struct platform_device *pdev)
> {
> struct plat_stmmacenet_data *plat_dat;
> @@ -89,6 +130,12 @@ 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) {
> + dev_err(&pdev->dev, "dwmac set mode failed.\n");
> + return err;
> + }

Usually it's better to keep all error messages at the same "level".
Like this you'll get two error messages if
syscon_regmap_lookup_by_phandle_args fails. So I'd suggest moving this
message into the starfive_dwmac_set_mode function and while you're at
it you can do

err = regmap_update_bits(...);
if (err)
return dev_err_probe(dwmac->dev, err, "error setting phy mode\n");

Also the file is called dwmac-starfive.c, so I'd expect the patch
header to be "net: stmmac: dwmac-starfive: Add phy interface
settings".

/Emil

> 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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