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SubjectRe: [PATCH v5 10/10] net: stmmac: dwmac-sun8i: Handle integrated/external MDIOs
> +#define DWMAC_sUN8I_MDIO_MUX_INTERNAL_ID	0
> +#define DWMAC_sUN8I_MDIO_MUX_EXTERNAL_ID 1
>
> /* H3/A64 specific bits */
> #define SYSCON_RMII_EN BIT(13) /* 1: enable RMII (overrides EPIT) */
> @@ -634,6 +639,76 @@ static int sun8i_dwmac_reset(struct stmmac_priv *priv)
> return 0;
> }
>
> +/* MDIO multiplexing switch function
> + * This function is called by the mdio-mux layer when it thinks the mdio bus
> + * multiplexer needs to switch.
> + * 'current_child' is the current value of the mux register
> + * 'desired_child' is the value of the 'reg' property of the target child MDIO
> + * node.
> + * The first time this function is called, current_child == -1.
> + * If current_child == desired_child, then the mux is already set to the
> + * correct bus.
> + *
> + * Note that we do not use reg/mask like mdio-mux-mmioreg because we need to
> + * know easily which bus is used (reset must be done only for desired bus).
> + */
> +static int mdio_mux_syscon_switch_fn(int current_child, int desired_child,
> + void *data)
> +{
> + struct stmmac_priv *priv = data;
> + struct sunxi_priv_data *gmac = priv->plat->bsp_priv;
> + u32 reg, val;
> + int ret = 0;
> + bool need_reset = false;
> +
> + if (current_child ^ desired_child) {
> + regmap_read(gmac->regmap, SYSCON_EMAC_REG, &reg);
> + switch (desired_child) {
> + case DWMAC_sUN8I_MDIO_MUX_INTERNAL_ID:
> + dev_info(priv->device, "Switch mux to internal PHY");
> + val = (reg & ~H3_EPHY_MUX_MASK) | H3_EPHY_SELECT;
> + if (gmac->use_internal_phy)
> + need_reset = true;
> + break;

This i don't get. Why do you need use_internal_phy? Isn't that
implicit from DWMAC_sUN8I_MDIO_MUX_INTERNAL_ID? Is it even possible to
use an external PHY on the internal MDIO bus?

> + case DWMAC_sUN8I_MDIO_MUX_EXTERNAL_ID:
> + dev_info(priv->device, "Switch mux to external PHY");
> + val = (reg & ~H3_EPHY_MUX_MASK) | H3_EPHY_SHUTDOWN;
> + if (!gmac->use_internal_phy)
> + need_reset = true;
> + break;

And is it possible to use the internal PHY on the external bus?

Andrew

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