Subject: Re: [PATCH 1/4] GMAC: add driver for Rockchip RK3288 SoCs integrated GMAC

From: Giuseppe CAVALLARO <[email-masked]>
Date: Tue, 25 Nov 2014 11:05:09 +0100

Hello Roger

thx for these patches, my comments inline below

On 11/25/2014 10:07 AM, Roger Chen wrote:
> This driver is based on stmmac driver.
>
> Signed-off-by: Roger Chen <[email-masked]>
> ---
>   drivers/net/ethernet/stmicro/stmmac/Makefile       |    2 +-
>   drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c     |  629 ++++++++++++++++++++
>   .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |    3 +
>   .../net/ethernet/stmicro/stmmac/stmmac_platform.h  |    1 +
>   4 files changed, 634 insertions(+), 1 deletion(-)
>   create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile
> index ac4d562..73c2715 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/Makefile
> +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile
> @@ -6,7 +6,7 @@ stmmac-objs:= stmmac_main.o stmmac_ethtool.o stmmac_mdio.o ring_mode.o	\
>
>   obj-$(CONFIG_STMMAC_PLATFORM) += stmmac-platform.o
>   stmmac-platform-objs:= stmmac_platform.o dwmac-meson.o dwmac-sunxi.o	\
> -		       dwmac-sti.o dwmac-socfpga.o
> +		       dwmac-sti.o dwmac-socfpga.o dwmac-rk.o
>
>   obj-$(CONFIG_STMMAC_PCI) += stmmac-pci.o
>   stmmac-pci-objs:= stmmac_pci.o
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
> new file mode 100644
> index 0000000..9e50b37
> --- /dev/null
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-rk.c
> @@ -0,0 +1,629 @@
> +/**
> + * dwmac-rk.c - Rockchip RK3288 DWMAC specific glue layer
> + *
> + * Copyright (C) 2014 Chen-Zhi (Roger Chen)
> + *
> + * Chen-Zhi (Roger Chen)  <[email-masked]>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/stmmac.h>
> +#include <linux/clk.h>
> +#include <linux/phy.h>
> +#include <linux/of_net.h>
> +#include <linux/gpio.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_device.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/delay.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +
> +struct rk_priv_data {
> +	struct platform_device *pdev;
> +	int phy_iface;
> +	bool power_ctrl_by_pmu;
> +	char pmu_regulator[32];
> +	int pmu_enable_level;
> +
> +	int power_io;
> +	int power_io_level;
> +	int reset_io;
> +	int reset_io_level;
> +	int phyirq_io;
> +	int phyirq_io_level;
> +
> +	bool clk_enabled;
> +	bool clock_input;
> +
> +	struct clk *clk_mac;
> +	struct clk *clk_mac_pll;
> +	struct clk *gmac_clkin;
> +	struct clk *mac_clk_rx;
> +	struct clk *mac_clk_tx;
> +	struct clk *clk_mac_ref;
> +	struct clk *clk_mac_refout;
> +	struct clk *aclk_mac;
> +	struct clk *pclk_mac;
> +
> +	int tx_delay;
> +	int rx_delay;
> +
> +	struct regmap *grf;
> +};
> +
> +#define RK3288_GRF_SOC_CON1 0x0248
> +#define RK3288_GRF_SOC_CON3 0x0250
> +#define RK3288_GRF_GPIO3D_E 0x01ec
> +#define RK3288_GRF_GPIO4A_E 0x01f0
> +#define RK3288_GRF_GPIO4B_E 0x01f4
> +
> +/*RK3288_GRF_SOC_CON1*/
> +#define GMAC_PHY_INTF_SEL_RGMII ((0x01C0 << 16) | (0x0040))
> +#define GMAC_PHY_INTF_SEL_RMII  ((0x01C0 << 16) | (0x0100))
> +#define GMAC_FLOW_CTRL          ((0x0200 << 16) | (0x0200))
> +#define GMAC_FLOW_CTRL_CLR      ((0x0200 << 16) | (0x0000))
> +#define GMAC_SPEED_10M          ((0x0400 << 16) | (0x0000))
> +#define GMAC_SPEED_100M         ((0x0400 << 16) | (0x0400))
> +#define GMAC_RMII_CLK_25M       ((0x0800 << 16) | (0x0800))
> +#define GMAC_RMII_CLK_2_5M      ((0x0800 << 16) | (0x0000))
> +#define GMAC_CLK_125M           ((0x3000 << 16) | (0x0000))
> +#define GMAC_CLK_25M            ((0x3000 << 16) | (0x3000))
> +#define GMAC_CLK_2_5M           ((0x3000 << 16) | (0x2000))
> +#define GMAC_RMII_MODE          ((0x4000 << 16) | (0x4000))
> +#define GMAC_RMII_MODE_CLR      ((0x4000 << 16) | (0x0000))
> +
> +/*RK3288_GRF_SOC_CON3*/
> +#define GMAC_TXCLK_DLY_ENABLE   ((0x4000 << 16) | (0x4000))
> +#define GMAC_TXCLK_DLY_DISABLE  ((0x4000 << 16) | (0x0000))
> +#define GMAC_RXCLK_DLY_ENABLE   ((0x8000 << 16) | (0x8000))
> +#define GMAC_RXCLK_DLY_DISABLE  ((0x8000 << 16) | (0x0000))
> +#define GMAC_CLK_RX_DL_CFG(val) ((0x3F80 << 16) | (val<<7))
> +#define GMAC_CLK_TX_DL_CFG(val) ((0x007F << 16) | (val))

why do not use BIT and BIT_MASK where possible?

> +static void set_to_rgmii(struct rk_priv_data *bsp_priv,
> +			 int tx_delay, int rx_delay)
> +{
> +	if (IS_ERR(bsp_priv->grf)) {
> +		pr_err("%s: Missing rockchip,grf property\n", __func__);
> +		return;
> +	}
> +
> +	regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
> +		     GMAC_PHY_INTF_SEL_RGMII);
> +	regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
> +		     GMAC_RMII_MODE_CLR);

maybe you could perform just one write unless there is some HW
constraint.

> +	regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON3,
> +		     GMAC_RXCLK_DLY_ENABLE);
> +	regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON3,
> +		     GMAC_TXCLK_DLY_ENABLE);
> +	regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON3,
> +		     GMAC_CLK_RX_DL_CFG(rx_delay));
> +	regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON3,
> +		     GMAC_CLK_TX_DL_CFG(tx_delay));

ditto

> +
> +	regmap_write(bsp_priv->grf, RK3288_GRF_GPIO3D_E, 0xFFFFFFFF);
> +	regmap_write(bsp_priv->grf, RK3288_GRF_GPIO4B_E,
> +		     0x3<<2<<16 | 0x3<<2);

pls use macros, these shift sequence is really help to decode

> +	regmap_write(bsp_priv->grf, RK3288_GRF_GPIO4A_E, 0xFFFFFFFF);
> +
> +	pr_info("%s: tx delay=0x%x; rx delay=0x%x;\n",
> +		__func__, tx_delay, rx_delay);

may I suggest pr_debug?

> +}
> +
> +static void set_to_rmii(struct rk_priv_data *bsp_priv)
> +{
> +	if (IS_ERR(bsp_priv->grf)) {
> +		pr_err("%s: Missing rockchip,grf property\n", __func__);
> +		return;
> +	}
> +
> +	regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
> +		     GMAC_PHY_INTF_SEL_RMII);
> +	regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
> +		     GMAC_RMII_MODE);
> +}
> +
> +static void set_rgmii_speed(struct rk_priv_data *bsp_priv, int speed)
> +{
> +	if (IS_ERR(bsp_priv->grf)) {
> +		pr_err("%s: Missing rockchip,grf property\n", __func__);
> +		return;
> +	}
> +
> +	if (speed == 10)
> +		regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1, GMAC_CLK_2_5M);
> +	else if (speed == 100)
> +		regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1, GMAC_CLK_25M);
> +	else if (speed == 1000)
> +		regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1, GMAC_CLK_125M);
> +	else
> +		pr_err("unknown speed value for RGMII! speed=%d", speed);
> +}
> +
> +static void set_rmii_speed(struct rk_priv_data *bsp_priv, int speed)
> +{
> +	if (IS_ERR(bsp_priv->grf)) {
> +		pr_err("%s: Missing rockchip,grf property\n", __func__);
> +		return;
> +	}
> +
> +	if (speed == 10) {
> +		regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
> +			     GMAC_RMII_CLK_2_5M);
> +		regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
> +			     GMAC_SPEED_10M);
> +	} else if (speed == 100) {
> +		regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
> +			     GMAC_RMII_CLK_25M);
> +		regmap_write(bsp_priv->grf, RK3288_GRF_SOC_CON1,
> +			     GMAC_SPEED_100M);
> +	} else {
> +		pr_err("unknown speed value for RMII! speed=%d", speed);
> +	}
> +}
> +
> +#define MAC_CLK_RX	"mac_clk_rx"
> +#define MAC_CLK_TX	"mac_clk_tx"
> +#define CLK_MAC_REF	"clk_mac_ref"
> +#define CLK_MAC_REF_OUT	"clk_mac_refout"
> +#define CLK_MAC_PLL	"clk_mac_pll"
> +#define ACLK_MAC	"aclk_mac"
> +#define PCLK_MAC	"pclk_mac"
> +#define MAC_CLKIN	"ext_gmac"
> +#define CLK_MAC		"stmmaceth"

Concerning the clocks, the "stmmaceth" is actually used for the main
clock so maybe you should use another name.

See: Documentation/devicetree/bindings/net/stmmac.txt

For St platforms, it has been used: sti-ethclk but we could
used a common and better name: stmmac-phyclk
And I could also propose this change on STi glue-logic.

Then, I think that all the clock macros above should be documented
and maybe managed at DT level, what do you think?

> +
> +int gmac_clk_init(struct rk_priv_data *bsp_priv)
> +{
> +	struct device *dev = &bsp_priv->pdev->dev;
> +
> +	bsp_priv->clk_enabled = false;
> +
> +	bsp_priv->mac_clk_rx = clk_get(dev, MAC_CLK_RX);
> +	if (IS_ERR(bsp_priv->mac_clk_rx))
> +		pr_warn("%s: warning: cannot get clock %s\n",
> +			__func__, MAC_CLK_RX);
> +
> +	bsp_priv->mac_clk_tx = clk_get(dev, MAC_CLK_TX);
> +	if (IS_ERR(bsp_priv->mac_clk_tx))
> +		pr_warn("%s: warning: cannot get clock %s\n",
> +			__func__, MAC_CLK_TX);
> +
> +	bsp_priv->clk_mac_ref = clk_get(dev, CLK_MAC_REF);
> +	if (IS_ERR(bsp_priv->clk_mac_ref))
> +		pr_warn("%s: warning: cannot get clock %s\n",
> +			__func__, CLK_MAC_REF);
> +
> +	bsp_priv->clk_mac_refout = clk_get(dev, CLK_MAC_REF_OUT);
> +	if (IS_ERR(bsp_priv->clk_mac_refout))
> +		pr_warn("%s: warning:cannot get clock %s\n",
> +			__func__, CLK_MAC_REF_OUT);
> +
> +	bsp_priv->aclk_mac = clk_get(dev, ACLK_MAC);
> +	if (IS_ERR(bsp_priv->aclk_mac))
> +		pr_warn("%s: warning: cannot get clock %s\n",
> +			__func__, ACLK_MAC);
> +
> +	bsp_priv->pclk_mac = clk_get(dev, PCLK_MAC);
> +	if (IS_ERR(bsp_priv->pclk_mac))
> +		pr_warn("%s: warning: cannot get clock %s\n",
> +			__func__, PCLK_MAC);
> +
> +	bsp_priv->clk_mac_pll = clk_get(dev, CLK_MAC_PLL);
> +	if (IS_ERR(bsp_priv->clk_mac_pll))
> +		pr_warn("%s: warning: cannot get clock %s\n",
> +			__func__, CLK_MAC_PLL);
> +
> +	bsp_priv->gmac_clkin = clk_get(dev, MAC_CLKIN);
> +	if (IS_ERR(bsp_priv->gmac_clkin))
> +		pr_warn("%s: warning: cannot get clock %s\n",
> +			__func__, MAC_CLKIN);
> +
> +	bsp_priv->clk_mac = clk_get(dev, CLK_MAC);
> +	if (IS_ERR(bsp_priv->clk_mac))
> +		pr_warn("%s: warning: cannot get clock %s\n",
> +			__func__, CLK_MAC);
> +
> +	if (bsp_priv->clock_input) {
> +		pr_info("%s: clock input from PHY\n", __func__);
> +	} else {
> +		if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII)
> +			clk_set_rate(bsp_priv->clk_mac_pll, 50000000);
> +
> +		clk_set_parent(bsp_priv->clk_mac, bsp_priv->clk_mac_pll);
> +	}
> +
> +	return 0;
> +}
> +
> +static int gmac_clk_enable(struct rk_priv_data *bsp_priv, bool enable)
> +{
> +	int phy_iface = phy_iface = bsp_priv->phy_iface;
> +
> +	if (enable) {
> +		if (!bsp_priv->clk_enabled) {
> +			if (phy_iface == PHY_INTERFACE_MODE_RMII) {
> +				if (!IS_ERR(bsp_priv->mac_clk_rx))
> +					clk_prepare_enable(
> +						bsp_priv->mac_clk_rx);
> +
> +				if (!IS_ERR(bsp_priv->clk_mac_ref))
> +					clk_prepare_enable(
> +						bsp_priv->clk_mac_ref);
> +
> +				if (!IS_ERR(bsp_priv->clk_mac_refout))
> +					clk_prepare_enable(
> +						bsp_priv->clk_mac_refout);
> +			}
> +
> +			if (!IS_ERR(bsp_priv->aclk_mac))
> +				clk_prepare_enable(bsp_priv->aclk_mac);
> +
> +			if (!IS_ERR(bsp_priv->pclk_mac))
> +				clk_prepare_enable(bsp_priv->pclk_mac);
> +
> +			if (!IS_ERR(bsp_priv->mac_clk_tx))
> +				clk_prepare_enable(bsp_priv->mac_clk_tx);
> +
> +			/**
> +			 * if (!IS_ERR(bsp_priv->clk_mac))
> +			 *	clk_prepare_enable(bsp_priv->clk_mac);
> +			 */

why do you need to comment this? could it be related to the stmmaceth
clk that is used by the main?

> +			mdelay(5);

hmm, do you actually need this mdelay? Is it to stabilize PLL sources?

> +			bsp_priv->clk_enabled = true;
> +		}
> +	} else {
> +		if (bsp_priv->clk_enabled) {
> +			if (phy_iface == PHY_INTERFACE_MODE_RMII) {
> +				if (!IS_ERR(bsp_priv->mac_clk_rx))
> +					clk_disable_unprepare(
> +						bsp_priv->mac_clk_rx);
> +
> +				if (!IS_ERR(bsp_priv->clk_mac_ref))
> +					clk_disable_unprepare(
> +						bsp_priv->clk_mac_ref);
> +
> +				if (!IS_ERR(bsp_priv->clk_mac_refout))
> +					clk_disable_unprepare(
> +						bsp_priv->clk_mac_refout);
> +			}
> +
> +			if (!IS_ERR(bsp_priv->aclk_mac))
> +				clk_disable_unprepare(bsp_priv->aclk_mac);
> +
> +			if (!IS_ERR(bsp_priv->pclk_mac))
> +				clk_disable_unprepare(bsp_priv->pclk_mac);
> +
> +			if (!IS_ERR(bsp_priv->mac_clk_tx))
> +				clk_disable_unprepare(bsp_priv->mac_clk_tx);
> +			/**
> +			 * if (!IS_ERR(bsp_priv->clk_mac))
> +			 *	clk_disable_unprepare(bsp_priv->clk_mac);
> +			 */
> +			bsp_priv->clk_enabled = false;
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static int power_on_by_pmu(struct rk_priv_data *bsp_priv, bool enable)
> +{
> +	struct regulator *ldo;
> +	char *ldostr = bsp_priv->pmu_regulator;
> +	int ret;
> +
> +	if (!ldostr) {
> +		pr_err("%s: no ldo found\n", __func__);
> +		return -1;
> +	}
> +
> +	ldo = regulator_get(NULL, ldostr);
> +	if (!ldo) {
> +		pr_err("\n%s get ldo %s failed\n", __func__, ldostr);
> +	} else {
> +		if (enable) {
> +			if (!regulator_is_enabled(ldo)) {
> +				regulator_set_voltage(ldo, 3300000, 3300000);
> +				ret = regulator_enable(ldo);
> +				if (ret != 0)
> +					pr_err("%s: fail to enable %s\n",
> +					       __func__, ldostr);
> +				else
> +					pr_info("turn on ldo done.\n");
> +			} else {
> +				pr_warn("%s is enabled before enable", ldostr);
> +			}
> +		} else {
> +			if (regulator_is_enabled(ldo)) {
> +				ret = regulator_disable(ldo);
> +				if (ret != 0)
> +					pr_err("%s: fail to disable %s\n",
> +					       __func__, ldostr);
> +				else
> +					pr_info("turn off ldo done.\n");
> +			} else {
> +				pr_warn("%s is disabled before disable",
> +					ldostr);
> +			}
> +		}
> +		regulator_put(ldo);
> +	}
> +
> +	return 0;
> +}
> +
> +static int power_on_by_gpio(struct rk_priv_data *bsp_priv, bool enable)
> +{
> +	if (enable) {
> +		/*power on*/
> +		if (gpio_is_valid(bsp_priv->power_io))
> +			gpio_direction_output(bsp_priv->power_io,
> +					      bsp_priv->power_io_level);
> +	} else {
> +		/*power off*/
> +		if (gpio_is_valid(bsp_priv->power_io))
> +			gpio_direction_output(bsp_priv->power_io,
> +					      !bsp_priv->power_io_level);
> +	}
> +
> +	return 0;
> +}
> +
> +static int phy_power_on(struct rk_priv_data *bsp_priv, bool enable)
> +{
> +	int ret = -1;
> +
> +	pr_info("Ethernet PHY power %s\n", enable == 1 ? "on" : "off");
> +
> +	if (bsp_priv->power_ctrl_by_pmu)
> +		ret = power_on_by_pmu(bsp_priv, enable);
> +	else
> +		ret =  power_on_by_gpio(bsp_priv, enable);
> +
> +	if (enable) {
> +		/*reset*/
> +		if (gpio_is_valid(bsp_priv->reset_io)) {
> +			gpio_direction_output(bsp_priv->reset_io,
> +					      bsp_priv->reset_io_level);
> +			mdelay(5);
> +			gpio_direction_output(bsp_priv->reset_io,
> +					      !bsp_priv->reset_io_level);
> +		}
> +		mdelay(30);
> +
> +	} else {
> +		/*pull down reset*/
> +		if (gpio_is_valid(bsp_priv->reset_io)) {
> +			gpio_direction_output(bsp_priv->reset_io,
> +					      bsp_priv->reset_io_level);
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +#define GPIO_PHY_POWER	"gmac_phy_power"
> +#define GPIO_PHY_RESET	"gmac_phy_reset"
> +#define GPIO_PHY_IRQ	"gmac_phy_irq"
> +
> +static void *rk_gmac_setup(struct platform_device *pdev)
> +{
> +	struct rk_priv_data *bsp_priv;
> +	struct device *dev = &pdev->dev;
> +	enum of_gpio_flags flags;
> +	int ret;
> +	const char *strings = NULL;
> +	int value;
> +	int irq;
> +
> +	bsp_priv = devm_kzalloc(dev, sizeof(*bsp_priv), GFP_KERNEL);
> +	if (!bsp_priv)
> +		return ERR_PTR(-ENOMEM);
> +
> +	bsp_priv->phy_iface = of_get_phy_mode(dev->of_node);
> +
> +	ret = of_property_read_string(dev->of_node, "pmu_regulator", &strings);
> +	if (ret) {
> +		pr_err("%s: Can not read property: pmu_regulator.\n", __func__);
> +		bsp_priv->power_ctrl_by_pmu = false;
> +	} else {
> +		pr_info("%s: ethernet phy power controlled by pmu(%s).\n",
> +			__func__, strings);
> +		bsp_priv->power_ctrl_by_pmu = true;
> +		strcpy(bsp_priv->pmu_regulator, strings);
> +	}
> +
> +	ret = of_property_read_u32(dev->of_node, "pmu_enable_level", &value);
> +	if (ret) {
> +		pr_err("%s: Can not read property: pmu_enable_level.\n",
> +		       __func__);
> +		bsp_priv->power_ctrl_by_pmu = false;
> +	} else {
> +		pr_info("%s: PHY power controlled by pmu(level = %s).\n",
> +			__func__, (value == 1) ? "HIGH" : "LOW");
> +		bsp_priv->power_ctrl_by_pmu = true;
> +		bsp_priv->pmu_enable_level = value;
> +	}
> +
> +	ret = of_property_read_string(dev->of_node, "clock_in_out", &strings);
> +	if (ret) {
> +		pr_err("%s: Can not read property: clock_in_out.\n", __func__);
> +		bsp_priv->clock_input = true;
> +	} else {
> +		pr_info("%s: clock input or output? (%s).\n",
> +			__func__, strings);
> +		if (!strcmp(strings, "input"))
> +			bsp_priv->clock_input = true;
> +		else
> +			bsp_priv->clock_input = false;
> +	}
> +
> +	ret = of_property_read_u32(dev->of_node, "tx_delay", &value);
> +	if (ret) {
> +		bsp_priv->tx_delay = 0x30;
> +		pr_err("%s: Can not read property: tx_delay.", __func__);
> +		pr_err("%s: set tx_delay to 0x%x\n",
> +		       __func__, bsp_priv->tx_delay);
> +	} else {
> +		pr_info("%s: TX delay(0x%x).\n", __func__, value);
> +		bsp_priv->tx_delay = value;
> +	}
> +
> +	ret = of_property_read_u32(dev->of_node, "rx_delay", &value);
> +	if (ret) {
> +		bsp_priv->rx_delay = 0x10;
> +		pr_err("%s: Can not read property: rx_delay.", __func__);
> +		pr_err("%s: set rx_delay to 0x%x\n",
> +		       __func__, bsp_priv->rx_delay);
> +	} else {
> +		pr_info("%s: RX delay(0x%x).\n", __func__, value);
> +		bsp_priv->rx_delay = value;
> +	}
> +
> +	bsp_priv->grf = syscon_regmap_lookup_by_phandle(dev->of_node,
> +							"rockchip,grf");
> +	if (IS_ERR(bsp_priv->grf))
> +		dev_err(&pdev->dev, "Missing rockchip,grf property\n");

I wonder if you can fail on here and save all the check in
set_rgmii_speed etc.
Maybe this can be considered a mandatory property for the glue-logic.

> +
> +	bsp_priv->phyirq_io =
> +		of_get_named_gpio_flags(dev->of_node,
> +					"phyirq-gpio", 0, &flags);
> +	bsp_priv->phyirq_io_level = (flags & OF_GPIO_ACTIVE_LOW) ? 0 : 1;

Sorry, did you document all in Documentation/devicetree/bindings/net/ ?

> +
> +	bsp_priv->reset_io =
> +		of_get_named_gpio_flags(dev->of_node,
> +					"reset-gpio", 0, &flags);
> +	bsp_priv->reset_io_level = (flags & OF_GPIO_ACTIVE_LOW) ? 0 : 1;
> +
> +	bsp_priv->power_io =
> +		of_get_named_gpio_flags(dev->of_node, "power-gpio", 0, &flags);
> +	bsp_priv->power_io_level = (flags & OF_GPIO_ACTIVE_LOW) ? 0 : 1;
> +
> +	/*power*/
> +	if (!gpio_is_valid(bsp_priv->power_io)) {
> +		pr_err("%s: Failed to get GPIO %s.\n",
> +		       __func__, "power-gpio");
> +	} else {
> +		ret = gpio_request(bsp_priv->power_io, GPIO_PHY_POWER);
> +		if (ret)
> +			pr_err("%s: ERROR: Failed to request GPIO %s.\n",
> +			       __func__, GPIO_PHY_POWER);
> +	}
> +
> +	if (!gpio_is_valid(bsp_priv->reset_io)) {
> +		pr_err("%s: ERROR: Get reset-gpio failed.\n", __func__);
> +	} else {
> +		ret = gpio_request(bsp_priv->reset_io, GPIO_PHY_RESET);
> +		if (ret)
> +			pr_err("%s: ERROR: Failed to request GPIO %s.\n",
> +			       __func__, GPIO_PHY_RESET);
> +	}
> +
> +	if (bsp_priv->phyirq_io > 0) {
> +		struct plat_stmmacenet_data *plat_dat;
> +
> +		pr_info("PHY irq in use\n");
> +		ret = gpio_request(bsp_priv->phyirq_io, GPIO_PHY_IRQ);
> +		if (ret < 0) {
> +			pr_warn("%s: Failed to request GPIO %s\n",
> +				__func__, GPIO_PHY_IRQ);
> +			goto goon;
> +		}
> +
> +		ret = gpio_direction_input(bsp_priv->phyirq_io);
> +		if (ret < 0) {
> +			pr_err("%s, Failed to set input for GPIO %s\n",
> +			       __func__, GPIO_PHY_IRQ);
> +			gpio_free(bsp_priv->phyirq_io);
> +			goto goon;
> +		}
> +
> +		irq = gpio_to_irq(bsp_priv->phyirq_io);
> +		if (irq < 0) {
> +			ret = irq;
> +			pr_err("Failed to set irq for %s\n",
> +			       GPIO_PHY_IRQ);
> +			gpio_free(bsp_priv->phyirq_io);
> +			goto goon;
> +		}
> +
> +		plat_dat = dev_get_platdata(&pdev->dev);
> +		if (plat_dat)
> +			plat_dat->mdio_bus_data->probed_phy_irq = irq;
> +		else
> +			pr_err("%s: plat_data is NULL\n", __func__);
> +	}
> +
> +goon:
> +	/*rmii or rgmii*/
> +	if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RGMII) {
> +		pr_info("%s: init for RGMII\n", __func__);
> +		set_to_rgmii(bsp_priv, bsp_priv->tx_delay, bsp_priv->rx_delay);
> +	} else if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII) {
> +		pr_info("%s: init for RMII\n", __func__);
> +		set_to_rmii(bsp_priv);
> +	} else {
> +		pr_err("%s: ERROR: NO interface defined!\n", __func__);
> +	}
> +
> +	bsp_priv->pdev = pdev;
> +
> +	gmac_clk_init(bsp_priv);
> +
> +	return bsp_priv;
> +}
> +
> +static int rk_gmac_init(struct platform_device *pdev, void *priv)
> +{
> +	struct rk_priv_data *bsp_priv = priv;
> +	int ret;
> +
> +	ret = phy_power_on(bsp_priv, true);
> +	if (ret)
> +		return ret;
> +
> +	ret = gmac_clk_enable(bsp_priv, true);
> +	if (ret)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static void rk_gmac_exit(struct platform_device *pdev, void *priv)
> +{
> +	struct rk_priv_data *gmac = priv;
> +
> +	phy_power_on(gmac, false);
> +	gmac_clk_enable(gmac, false);
> +}
> +
> +static void rk_fix_speed(void *priv, unsigned int speed)
> +{
> +	struct rk_priv_data *bsp_priv = priv;
> +
> +	if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RGMII)
> +		set_rgmii_speed(bsp_priv, speed);
> +	else if (bsp_priv->phy_iface == PHY_INTERFACE_MODE_RMII)
> +		set_rmii_speed(bsp_priv, speed);
> +	else
> +		pr_err("unsupported interface %d", bsp_priv->phy_iface);
> +}
> +
> +const struct stmmac_of_data rk_gmac_data = {
> +	.has_gmac = 1,
> +	.tx_coe = 1,

FYI, on new gmac there is the HW capability register to dinamically
provide you if coe is supported.

IMO you should add the OF "compatible" string and in case of mac
newer than the 3.50a you can remove coe.

BR
Peppe

> +	.fix_mac_speed = rk_fix_speed,
> +	.setup = rk_gmac_setup,
> +	.init = rk_gmac_init,
> +	.exit = rk_gmac_exit,
> +};
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 15814b7..b4dee96 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -33,6 +33,7 @@
>
>   static const struct of_device_id stmmac_dt_ids[] = {
>   	/* SoC specific glue layers should come before generic bindings */
> +	{ .compatible = "rockchip,rk3288-gmac", .data = &rk_gmac_data},
>   	{ .compatible = "amlogic,meson6-dwmac", .data = &meson6_dwmac_data},
>   	{ .compatible = "allwinner,sun7i-a20-gmac", .data = &sun7i_gmac_data},
>   	{ .compatible = "st,stih415-dwmac", .data = &stih4xx_dwmac_data},
> @@ -291,6 +292,8 @@ static int stmmac_pltfr_probe(struct platform_device *pdev)
>   			return  -ENOMEM;
>   		}
>
> +		pdev->dev.platform_data = plat_dat;
> +
>   		ret = stmmac_probe_config_dt(pdev, plat_dat, &mac);
>   		if (ret) {
>   			pr_err("%s: main dt probe failed", __func__);
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
> index 25dd1f7..32a0516 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.h
> @@ -24,5 +24,6 @@ extern const struct stmmac_of_data sun7i_gmac_data;
>   extern const struct stmmac_of_data stih4xx_dwmac_data;
>   extern const struct stmmac_of_data stid127_dwmac_data;
>   extern const struct stmmac_of_data socfpga_gmac_data;
> +extern const struct stmmac_of_data rk_gmac_data;
>
>   #endif /* __STMMAC_PLATFORM_H__ */
>