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Message-ID: <6b1ebf64-6903-6d35-b1fc-92ec47334425@gmail.com>
Date: Wed, 2 Aug 2017 10:38:04 -0700
From: Florian Fainelli <f.fainelli@...il.com>
To: David Wu <david.wu@...k-chips.com>, davem@...emloft.net,
heiko@...ech.de, andrew@...n.ch, robh+dt@...nel.org,
mark.rutland@....com, catalin.marinas@....com, will.deacon@....com,
olof@...om.net, linux@...linux.org.uk, arnd@...db.de
Cc: peppe.cavallaro@...com, alexandre.torgue@...com,
huangtao@...k-chips.com, hwg@...k-chips.com,
netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 05/11] net: stmmac: dwmac-rk: Add internal phy support
On 08/01/2017 11:21 PM, David Wu wrote:
> To make internal phy work, need to configure the phy_clock,
> phy cru_reset and related registers.
>
> Signed-off-by: David Wu <david.wu@...k-chips.com>
> ---
> .../devicetree/bindings/net/rockchip-dwmac.txt | 6 +-
> drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c | 81 ++++++++++++++++++++++
> 2 files changed, 86 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/net/rockchip-dwmac.txt b/Documentation/devicetree/bindings/net/rockchip-dwmac.txt
> index 8f42755..ec39b31 100644
> --- a/Documentation/devicetree/bindings/net/rockchip-dwmac.txt
> +++ b/Documentation/devicetree/bindings/net/rockchip-dwmac.txt
> @@ -25,7 +25,8 @@ Required properties:
> - clock-names: One name for each entry in the clocks property.
> - phy-mode: See ethernet.txt file in the same directory.
> - pinctrl-names: Names corresponding to the numbered pinctrl states.
> - - pinctrl-0: pin-control mode. can be <&rgmii_pins> or <&rmii_pins>.
> + - pinctrl-0: pin-control mode. can be <&rgmii_pins>, <&rmii_pins> or led pins
> + for internal phy mode.
> - clock_in_out: For RGMII, it must be "input", means main clock(125MHz)
> is not sourced from SoC's PLL, but input from PHY; For RMII, "input" means
> PHY provides the reference clock(50MHz), "output" means GMAC provides the
> @@ -40,6 +41,9 @@ Optional properties:
> - tx_delay: Delay value for TXD timing. Range value is 0~0x7F, 0x30 as default.
> - rx_delay: Delay value for RXD timing. Range value is 0~0x7F, 0x10 as default.
> - phy-supply: phandle to a regulator if the PHY needs one
> + - clocks: <&cru MAC_PHY>: Clock selector for internal macphy
> + - phy-is-internal: A boolean property allows us to know that MAC will connect to
> + internal phy.
This is incorrect in two ways:
- this is a property of the PHY, so it should be documented as such in
Documentation/devicetree/bindings/net/phy.txt so other bindings can
re-use it
- if it was specific to your MAC you would expect a vendor prefix to
this property, which is not there
An alternative way to implement the external/internal logic selection
would be mandate that your Ethernet PHY node have a compatible string
like this:
phy@0 {
compatible = "ethernet-phy-id1234.d400", "ethernet-phy-802.3-c22";
};
Then you don't need this phy-is-internal property, because you can
locate the PHY node by the phy-handle (see more about that in a reply to
patch 10) and you can determine ahead of time whether this PHY is
internal or not based on its compatible string.
Thank you
>
> Example:
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
> index a8e8fd5..7b80ab9 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
> @@ -41,6 +41,7 @@ struct rk_gmac_ops {
> void (*set_to_rmii)(struct rk_priv_data *bsp_priv);
> void (*set_rgmii_speed)(struct rk_priv_data *bsp_priv, int speed);
> void (*set_rmii_speed)(struct rk_priv_data *bsp_priv, int speed);
> + void (*internal_phy_powerup)(struct rk_priv_data *bsp_priv);
> };
>
> struct rk_priv_data {
> @@ -52,6 +53,7 @@ struct rk_priv_data {
>
> bool clk_enabled;
> bool clock_input;
> + bool internal_phy;
>
> struct clk *clk_mac;
> struct clk *gmac_clkin;
> @@ -61,6 +63,9 @@ struct rk_priv_data {
> struct clk *clk_mac_refout;
> struct clk *aclk_mac;
> struct clk *pclk_mac;
> + struct clk *clk_macphy;
> +
> + struct reset_control *macphy_reset;
>
> int tx_delay;
> int rx_delay;
> @@ -750,6 +755,50 @@ static void rk3399_set_rmii_speed(struct rk_priv_data *bsp_priv, int speed)
> .set_rmii_speed = rk3399_set_rmii_speed,
> };
>
> +#define RK_GRF_MACPHY_CON0 0xb00
> +#define RK_GRF_MACPHY_CON1 0xb04
> +#define RK_GRF_MACPHY_CON2 0xb08
> +#define RK_GRF_MACPHY_CON3 0xb0c
> +
> +#define RK_MACPHY_ENABLE GRF_BIT(0)
> +#define RK_MACPHY_DISABLE GRF_CLR_BIT(0)
> +#define RK_MACPHY_CFG_CLK_50M GRF_BIT(14)
> +#define RK_GMAC2PHY_RMII_MODE (GRF_BIT(6) | GRF_CLR_BIT(7))
> +#define RK_GRF_CON2_MACPHY_ID HIWORD_UPDATE(0x1234, 0xffff, 0)
> +#define RK_GRF_CON3_MACPHY_ID HIWORD_UPDATE(0x35, 0x3f, 0)
> +
> +static void rk_gmac_internal_phy_powerup(struct rk_priv_data *priv)
> +{
> + if (priv->ops->internal_phy_powerup)
> + priv->ops->internal_phy_powerup(priv);
> +
> + regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_CFG_CLK_50M);
> + regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_GMAC2PHY_RMII_MODE);
> +
> + regmap_write(priv->grf, RK_GRF_MACPHY_CON2, RK_GRF_CON2_MACPHY_ID);
> + regmap_write(priv->grf, RK_GRF_MACPHY_CON3, RK_GRF_CON3_MACPHY_ID);
> +
> + if (priv->macphy_reset) {
> + /* macphy needs to be disabled before trying to reset it */
> + regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_DISABLE);
> + if (priv->macphy_reset)
> + reset_control_assert(priv->macphy_reset);
> + usleep_range(10, 20);
> + if (priv->macphy_reset)
> + reset_control_deassert(priv->macphy_reset);
> + usleep_range(10, 20);
> + regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_ENABLE);
> + msleep(30);
> + }
> +}
> +
> +static void rk_gmac_internal_phy_powerdown(struct rk_priv_data *priv)
> +{
> + regmap_write(priv->grf, RK_GRF_MACPHY_CON0, RK_MACPHY_DISABLE);
> + if (priv->macphy_reset)
> + reset_control_assert(priv->macphy_reset);
> +}
> +
> static int gmac_clk_init(struct rk_priv_data *bsp_priv)
> {
> struct device *dev = &bsp_priv->pdev->dev;
> @@ -803,6 +852,14 @@ static int gmac_clk_init(struct rk_priv_data *bsp_priv)
> clk_set_rate(bsp_priv->clk_mac, 50000000);
> }
>
> + if (bsp_priv->internal_phy) {
> + bsp_priv->clk_macphy = devm_clk_get(dev, "clk_macphy");
> + if (IS_ERR(bsp_priv->clk_macphy))
> + dev_err(dev, "cannot get %s clock\n", "clk_macphy");
> + else
> + clk_set_rate(bsp_priv->clk_macphy, 50000000);
> + }
> +
> return 0;
> }
>
> @@ -826,6 +883,9 @@ static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
> bsp_priv->clk_mac_refout);
> }
>
> + if (!IS_ERR(bsp_priv->clk_macphy))
> + clk_prepare_enable(bsp_priv->clk_macphy);
> +
> if (!IS_ERR(bsp_priv->aclk_mac))
> clk_prepare_enable(bsp_priv->aclk_mac);
>
> @@ -858,6 +918,9 @@ static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
> bsp_priv->clk_mac_refout);
> }
>
> + if (!IS_ERR(bsp_priv->clk_macphy))
> + clk_disable_unprepare(bsp_priv->clk_macphy);
> +
> if (!IS_ERR(bsp_priv->aclk_mac))
> clk_disable_unprepare(bsp_priv->aclk_mac);
>
> @@ -940,6 +1003,18 @@ static struct rk_priv_data *rk_gmac_setup(struct platform_device *pdev,
> bsp_priv->clock_input = false;
> }
>
> + bsp_priv->internal_phy = device_property_read_bool(dev,
> + "phy-is-internal");
> + if (bsp_priv->internal_phy) {
> + bsp_priv->macphy_reset = devm_reset_control_get(dev, "mac-phy");
> + if (IS_ERR(bsp_priv->macphy_reset)) {
> + dev_info(dev, "no macphy_reset control found\n");
> + bsp_priv->macphy_reset = NULL;
> + }
> + }
> + dev_info(dev, "internal PHY? (%s).\n",
> + bsp_priv->internal_phy ? "yes" : "no");
> +
> ret = of_property_read_u32(dev->of_node, "tx_delay", &value);
> if (ret) {
> bsp_priv->tx_delay = 0x30;
> @@ -1014,6 +1089,9 @@ static int rk_gmac_powerup(struct rk_priv_data *bsp_priv)
> pm_runtime_enable(dev);
> pm_runtime_get_sync(dev);
>
> + if (bsp_priv->internal_phy)
> + rk_gmac_internal_phy_powerup(bsp_priv);
> +
> return 0;
> }
>
> @@ -1021,6 +1099,9 @@ static void rk_gmac_powerdown(struct rk_priv_data *gmac)
> {
> struct device *dev = &gmac->pdev->dev;
>
> + if (gmac->internal_phy)
> + rk_gmac_internal_phy_powerdown(gmac);
> +
> pm_runtime_put_sync(dev);
> pm_runtime_disable(dev);
>
>
--
Florian
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