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Message-ID: <5cd4b993-d1fa-80a2-a03b-a494a63ae56c@gmail.com>
Date: Wed, 20 Mar 2019 11:27:09 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: Christian Lamparter <chunkeey@...il.com>, netdev@...r.kernel.org,
devicetree@...r.kernel.org
Cc: Vivien Didelot <vivien.didelot@...il.com>,
Andrew Lunn <andrew@...n.ch>, Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v3 3/3] net: dsa: qca8k: extend slave-bus implementations
On 3/19/19 12:54 PM, Christian Lamparter wrote:
> This patch implements accessors for the QCA8337 MDIO access
> through the MDIO_MASTER register, which makes it possible to
> access the PHYs on slave-bus through the switch. In cases
> where the switch ports are already mapped via external
> "phy-phandles", the internal mdio-bus is disabled in order to
> prevent a duplicated discovery and enumeration of the same
> PHYs. Don't use mixed external and internal mdio-bus
> configurations, as this is not supported by the hardware.
>
> Signed-off-by: Christian Lamparter <chunkeey@...il.com>
> ---
> Changes from v2:
> - Make it compatible with existing configurations
> - make it clear that's sadly a either external or
> internal mdio bus access.
>
> Changes from v1:
> - drop DT port <-> phy mapping
> - added register definitions for the MDIO control register
> - implemented new slave-mdio bus accessors
> - DT-binding: fix switch's PSEUDO_PHY address. It's 0x10 not 0.
>
> Old patch (+ discussion) for reference:
> <https://patchwork.ozlabs.org/patch/1036309/>
LGTM, just a few comments/nits below.
>
> Tested on a Compex WPQ864 (IPQ8064 + QCA8337N)
> internal bus:
> qca8k 37000000.mdio-mii:10 lan1 (uninitialized): PHY [!mdio@...00000!switch@10:01] driver [Generic PHY]
> qca8k 37000000.mdio-mii:10 lan2 (uninitialized): PHY [!mdio@...00000!switch@10:02] driver [Generic PHY]
> qca8k 37000000.mdio-mii:10 lan3 (uninitialized): PHY [!mdio@...00000!switch@10:03] driver [Generic PHY]
> qca8k 37000000.mdio-mii:10 lan4 (uninitialized): PHY [!mdio@...00000!switch@10:04] driver [Generic PHY]
> qca8k 37000000.mdio-mii:10 wan (uninitialized): PHY [!mdio@...00000!switch@10:05] driver [Generic PHY]
>
> external bus:
> qca8k 37000000.mdio-mii:10 lan1 (uninitialized): PHY [37000000.mdio-mii:00] driver [Generic PHY]
> qca8k 37000000.mdio-mii:10 lan2 (uninitialized): PHY [37000000.mdio-mii:01] driver [Generic PHY]
> qca8k 37000000.mdio-mii:10 lan3 (uninitialized): PHY [37000000.mdio-mii:02] driver [Generic PHY]
> qca8k 37000000.mdio-mii:10 lan4 (uninitialized): PHY [37000000.mdio-mii:03] driver [Generic PHY]
> qca8k 37000000.mdio-mii:10 wan (uninitialized): PHY [37000000.mdio-mii:04] driver [Generic PHY]
> ---
[snip]
> +static int
> +qca8k_mdio_write(struct qca8k_priv *priv, int port, int regnum, u16 data)
> +{
> + u32 val;
> + int phy;
> +
> + phy = qca8k_port_to_phy(port);
> + if (phy < 0 || (regnum < 0 || regnum >= QCA8K_MDIO_MASTER_MAX_REG))
> + return -EINVAL;
Is not the first condition always true? We should fix the signature of
phy_{read,write} in dsa.h to match what mdiobus_{read,write} takes,
which is an u32 regnum.
> +
> + val = QCA8K_MDIO_MASTER_BUSY | QCA8K_MDIO_MASTER_EN |
> + QCA8K_MDIO_MASTER_WRITE | QCA8K_MDIO_MASTER_PHY_ADDR(phy) |
> + QCA8K_MDIO_MASTER_REG_ADDR(regnum) |
> + QCA8K_MDIO_MASTER_DATA(data);
> +
> + qca8k_write(priv, QCA8K_MDIO_MASTER_CTRL, val);
> +
> + return qca8k_busy_wait(priv, QCA8K_MDIO_MASTER_CTRL,
> + QCA8K_MDIO_MASTER_BUSY);
> +}
> +
> +static int
> +qca8k_mdio_read(struct qca8k_priv *priv, int port, int regnum)
> +{
> + u32 val;
> + int phy;
> +
> + phy = qca8k_port_to_phy(port);
> + if (phy < 0 || (regnum < 0 || regnum >= QCA8K_MDIO_MASTER_MAX_REG))
> + return -EINVAL;
Likewise.
[snip]
> +static int
> +qca8k_phy_read(struct dsa_switch *ds, int port, int regnum)
> +{
> + struct qca8k_priv *priv = ds->priv;
> + int ret = -EIO;
> +
> + if (ds->slave_mii_bus->phy_mask & BIT(port))
> + ret = qca8k_mdio_read(priv, port, regnum);
I suppose in theory you could also look at the external_mdio_mask and do
something like this:
if (ds->slave_mii_bus->phy_mask & BIT(port))
ret = qca8k_mdio_read(priv, port, regnum);
else
ret = mdiobus_read_nested(priv->bus, port, regnum);
Not strictly necessary for now.
> +
> + return ret;
> +}
> +
> +static int
> +qca8k_setup_mdio_bus(struct qca8k_priv *priv)
> +{
> + struct device_node *ports, *port;
> + struct mii_bus *bus;
> + u32 internal_mdio_mask = 0;
> + u32 external_mdio_mask = 0;
> + u32 reg;
> + int err;
> +
> + ports = of_get_child_by_name(priv->dev->of_node, "ports");
> + if (!ports)
> + return -EINVAL;
> +
> + for_each_available_child_of_node(ports, port) {
> + err = of_property_read_u32(port, "reg", ®);
> + if (err)
> + return err;
> +
> + if (dsa_is_user_port(priv->ds, reg)) {
You could reduce indentation a bit with:
if (!dsa_is_user_port(priv->ds, reg))
continue;
> + if (of_property_read_bool(port, "phy-handle"))
> + external_mdio_mask |= BIT(reg);
> + else
> + internal_mdio_mask |= BIT(reg);
> + }
> + }
> +
> + if (!external_mdio_mask && !internal_mdio_mask) {
> + dev_err(priv->dev, "no PHYs are defined.\n");
> + return -EINVAL;
> + }
> +
> + /* The QCA8K_MDIO_MASTER_EN Bit, which grants access to PHYs through
> + * the MDIO_MASTER register also _disconnects_ the external MDC
> + * passthrough to the internal PHYs. It's not possible to use both
> + * configurations at the same time!
> + */
Right, but presumably you can do this on a per-port basis and support
both types of configuration? bcm_sf2 is pretty much the same thing.
> + if (external_mdio_mask && internal_mdio_mask) {
> + dev_err(priv->dev, "either internal or external mdio bus configuration is supported.\n");
> + return -EINVAL;
> + }
Don't both conditions amount to:
if (external_mdio_mask == internal_mdio_mask)
error()?
> +
> + if (external_mdio_mask) {
> + /* Make sure to disable the internal mdio bus in cases
> + * a dt-overlay and driver reload changed the configuration
> + */
> +
> + qca8k_reg_clear(priv, QCA8K_MDIO_MASTER_CTRL,
> + QCA8K_MDIO_MASTER_EN);
> + return 0;
> + }
> +
> + bus = devm_mdiobus_alloc_size(priv->dev, sizeof(priv));
> + if (!bus)
> + return -ENOMEM;
> + bus->priv = (void *)priv;
Cast is not necessary.
--
Florian
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