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(TLS) id 15.0.1395.4; Fri, 16 Nov 2018 17:18:52 +0800 Received: from localhost.localdomain (10.17.3.153) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 16 Nov 2018 17:18:51 +0800 From: Biao Huang To: , Subject: [v3, PATCH 1/2] net:stmmac: dwmac-mediatek: add support for mt2712 Date: Fri, 16 Nov 2018 17:18:45 +0800 Message-ID: <1542359926-28800-1-git-send-email-biao.huang@mediatek.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-TM-SNTS-SMTP: BE9A09ADEDBF72D7766D971790D425F8267701773520411BC01D97FB2DCF002F2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181116_091915_538591_8FC5BC1E X-CRM114-Status: GOOD ( 25.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, nelson.chang@mediatek.com, andrew@lunn.ch, biao.huang@mediatek.com, netdev@vger.kernel.org, liguo.zhang@mediatek.com, linux-kernel@vger.kernel.org, matthias.bgg@gmail.com, joabreu@synopsys.com, linux-mediatek@lists.infradead.org, honghui.zhang@mediatek.com, yt.shen@mediatek.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Add Ethernet support for MediaTek SoCs from the mt2712 family Change-Id: Id3c535627088227793bd36405994edf2dc765e6a Signed-off-by: Biao Huang --- drivers/net/ethernet/stmicro/stmmac/Kconfig | 8 + drivers/net/ethernet/stmicro/stmmac/Makefile | 1 + .../net/ethernet/stmicro/stmmac/dwmac-mediatek.c | 383 ++++++++++++++++++++ 3 files changed, 392 insertions(+) create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig index edf2036..28a7a28 100644 --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig @@ -75,6 +75,14 @@ config DWMAC_LPC18XX ---help--- Support for NXP LPC18xx/43xx DWMAC Ethernet. +config DWMAC_MEDIATEK + tristate "MediaTek MT27xx GMAC support" + depends on OF && (ARCH_MEDIATEK || COMPILE_TEST) + help + Support for MediaTek GMAC Ethernet controller. + + This selects the MT2712 SoC support for the stmmac driver. + config DWMAC_MESON tristate "Amlogic Meson dwmac support" default ARCH_MESON diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/ethernet/stmicro/stmmac/Makefile index 99967a8..bf09701 100644 --- a/drivers/net/ethernet/stmicro/stmmac/Makefile +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_STMMAC_PLATFORM) += stmmac-platform.o obj-$(CONFIG_DWMAC_ANARION) += dwmac-anarion.o obj-$(CONFIG_DWMAC_IPQ806X) += dwmac-ipq806x.o obj-$(CONFIG_DWMAC_LPC18XX) += dwmac-lpc18xx.o +obj-$(CONFIG_DWMAC_MEDIATEK) += dwmac-mediatek.o obj-$(CONFIG_DWMAC_MESON) += dwmac-meson.o dwmac-meson8b.o obj-$(CONFIG_DWMAC_OXNAS) += dwmac-oxnas.o obj-$(CONFIG_DWMAC_ROCKCHIP) += dwmac-rk.o diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c new file mode 100644 index 0000000..a80b3e0 --- /dev/null +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-mediatek.c @@ -0,0 +1,383 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (c) 2018 MediaTek Inc. + */ +#include +#include +#include +#include +#include +#include +#include + +#include "stmmac.h" +#include "stmmac_platform.h" + +/* Peri Configuration register */ +#define PERI_ETH_PHY_INTF_SEL 0x418 +#define PHY_INTF_MII_GMII 0 +#define PHY_INTF_RGMII 1 +#define PHY_INTF_RMII 4 +#define RMII_CLK_SRC_RXC BIT(4) +#define RMII_CLK_SRC_INTERNAL BIT(5) + +#define PERI_ETH_PHY_DLY 0x428 +#define PHY_DLY_GTXC_INV BIT(6) +#define PHY_DLY_GTXC_ENABLE BIT(5) +#define PHY_DLY_GTXC_STAGES GENMASK(4, 0) +#define PHY_DLY_TXC_INV BIT(20) +#define PHY_DLY_TXC_ENABLE BIT(19) +#define PHY_DLY_TXC_STAGES GENMASK(18, 14) +#define PHY_DLY_TXC_SHIFT 14 +#define PHY_DLY_RXC_INV BIT(13) +#define PHY_DLY_RXC_ENABLE BIT(12) +#define PHY_DLY_RXC_STAGES GENMASK(11, 7) +#define PHY_DLY_RXC_SHIFT 7 + +#define PERI_ETH_DLY_FINE 0x800 +#define ETH_RMII_DLY_TX_INV BIT(2) +#define ETH_FINE_DLY_GTXC BIT(1) +#define ETH_FINE_DLY_RXC BIT(0) + +enum dwmac_clks_map { + DWMAC_CLK_AXI_DRAM, + DWMAC_CLK_APB_REG, + DWMAC_CLK_MAC_EXT, + DWMAC_CLK_MAC_PARENT, + DWMAC_CLK_PTP_REF, + DWMAC_CLK_PTP_PARENT, + DWMAC_CLK_PTP_TOP, + DWMAC_CLK_MAX +}; + +struct mac_delay_struct { + u32 tx_delay; + u32 rx_delay; + u32 tx_inv; + u32 rx_inv; +}; + +struct mediatek_dwmac_plat_data { + struct device *dev; + struct regmap *peri_regmap; + struct clk *clks[DWMAC_CLK_MAX]; + struct device_node *np; + int phy_mode; + struct mac_delay_struct mac_delay; + const struct mediatek_dwmac_variant *variant; + int fine_tune; + int rmii_rxc; +}; + +struct mediatek_dwmac_variant { + int (*dwmac_config_dt)(struct mediatek_dwmac_plat_data *plat); + int (*dwmac_enable_clks)(struct mediatek_dwmac_plat_data *plat); + void (*dwmac_disable_clks)(struct mediatek_dwmac_plat_data *plat); + u32 rx_delay_max; + u32 tx_delay_max; +}; + +static const char * const mediatek_dwmac_clks_name[] = { + "axi", "apb", "mac_ext", "mac_parent", "ptp_ref", "ptp_parent", "ptp_top" +}; + +static int mt2712_set_interface(struct mediatek_dwmac_plat_data *plat) +{ + int rmii_rxc = plat->rmii_rxc ? RMII_CLK_SRC_RXC : 0; + u32 intf_val = 0; + + /* select phy interface in top control domain */ + switch (plat->phy_mode) { + case PHY_INTERFACE_MODE_MII: + intf_val |= PHY_INTF_MII_GMII; + break; + case PHY_INTERFACE_MODE_RMII: + intf_val |= PHY_INTF_RMII; + intf_val |= rmii_rxc; + break; + case PHY_INTERFACE_MODE_RGMII: + case PHY_INTERFACE_MODE_RGMII_TXID: + case PHY_INTERFACE_MODE_RGMII_RXID: + case PHY_INTERFACE_MODE_RGMII_ID: + intf_val |= PHY_INTF_RGMII; + break; + default: + dev_err(plat->dev, "phy interface not supported\n"); + return -EINVAL; + } + + regmap_write(plat->peri_regmap, PERI_ETH_PHY_INTF_SEL, intf_val); + + return 0; +} + +static int mt2712_set_delay(struct mediatek_dwmac_plat_data *plat) +{ + struct mac_delay_struct *mac_delay = &plat->mac_delay; + u32 delay_val = 0; + u32 fine_val = 0; + + switch (plat->phy_mode) { + case PHY_INTERFACE_MODE_MII: + delay_val |= mac_delay->tx_delay ? PHY_DLY_TXC_ENABLE : 0; + delay_val |= (mac_delay->tx_delay << PHY_DLY_TXC_SHIFT) & + PHY_DLY_TXC_STAGES; + delay_val |= mac_delay->tx_inv ? PHY_DLY_TXC_INV : 0; + delay_val |= mac_delay->rx_delay ? PHY_DLY_RXC_ENABLE : 0; + delay_val |= (mac_delay->rx_delay << PHY_DLY_RXC_SHIFT) & + PHY_DLY_RXC_STAGES; + delay_val |= mac_delay->rx_inv ? PHY_DLY_RXC_INV : 0; + break; + case PHY_INTERFACE_MODE_RMII: + if (plat->rmii_rxc) { + delay_val |= mac_delay->rx_delay ? + PHY_DLY_RXC_ENABLE : 0; + delay_val |= (mac_delay->rx_delay << + PHY_DLY_RXC_SHIFT) & PHY_DLY_RXC_STAGES; + delay_val |= mac_delay->rx_inv ? PHY_DLY_RXC_INV : 0; + fine_val |= mac_delay->tx_inv ? + ETH_RMII_DLY_TX_INV : 0; + } else { + delay_val |= mac_delay->rx_delay ? + PHY_DLY_TXC_ENABLE : 0; + delay_val |= (mac_delay->rx_delay << + PHY_DLY_TXC_SHIFT) & PHY_DLY_TXC_STAGES; + delay_val |= mac_delay->rx_inv ? PHY_DLY_TXC_INV : 0; + fine_val |= mac_delay->tx_inv ? + ETH_RMII_DLY_TX_INV : 0; + } + break; + case PHY_INTERFACE_MODE_RGMII: + fine_val = plat->fine_tune ? + (ETH_FINE_DLY_GTXC | ETH_FINE_DLY_RXC) : 0; + delay_val |= mac_delay->tx_delay ? PHY_DLY_GTXC_ENABLE : 0; + delay_val |= mac_delay->tx_delay & PHY_DLY_GTXC_STAGES; + delay_val |= mac_delay->tx_inv ? PHY_DLY_GTXC_INV : 0; + delay_val |= mac_delay->rx_delay ? PHY_DLY_RXC_ENABLE : 0; + delay_val |= (mac_delay->rx_delay << PHY_DLY_RXC_SHIFT) & + PHY_DLY_RXC_STAGES; + delay_val |= mac_delay->rx_inv ? PHY_DLY_RXC_INV : 0; + break; + case PHY_INTERFACE_MODE_RGMII_TXID: + fine_val = plat->fine_tune ? ETH_FINE_DLY_RXC : 0; + delay_val |= mac_delay->rx_delay ? PHY_DLY_RXC_ENABLE : 0; + delay_val |= (mac_delay->rx_delay << PHY_DLY_RXC_SHIFT) & + PHY_DLY_RXC_STAGES; + delay_val |= mac_delay->rx_inv ? PHY_DLY_RXC_INV : 0; + break; + case PHY_INTERFACE_MODE_RGMII_RXID: + fine_val = plat->fine_tune ? ETH_FINE_DLY_GTXC : 0; + delay_val |= mac_delay->tx_delay ? PHY_DLY_GTXC_ENABLE : 0; + delay_val |= mac_delay->tx_delay & PHY_DLY_GTXC_STAGES; + delay_val |= mac_delay->tx_inv ? PHY_DLY_GTXC_INV : 0; + break; + case PHY_INTERFACE_MODE_RGMII_ID: + break; + default: + dev_err(plat->dev, "phy interface not supported\n"); + return -EINVAL; + } + regmap_write(plat->peri_regmap, PERI_ETH_PHY_DLY, delay_val); + regmap_write(plat->peri_regmap, PERI_ETH_DLY_FINE, fine_val); + + return 0; +} + +static int mt2712_get_clks(struct mediatek_dwmac_plat_data *plat) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(plat->clks); i++) { + plat->clks[i] = devm_clk_get(plat->dev, + mediatek_dwmac_clks_name[i]); + if (IS_ERR(plat->clks[i])) + return PTR_ERR(plat->clks[i]); + } + + return 0; +} + +static int mt2712_enable_clks(struct mediatek_dwmac_plat_data *plat) +{ + int clk, ret; + + for (clk = 0; clk < DWMAC_CLK_MAX ; clk++) { + ret = clk_prepare_enable(plat->clks[clk]); + if (ret) + goto err_disable_clks; + } + + ret = clk_set_parent(plat->clks[DWMAC_CLK_MAC_EXT], plat->clks[DWMAC_CLK_MAC_PARENT]); + if (ret) + goto err_disable_clks; + + ret = clk_set_parent(plat->clks[DWMAC_CLK_PTP_REF], plat->clks[DWMAC_CLK_PTP_PARENT]); + if (ret) + goto err_disable_clks; + + return 0; + +err_disable_clks: + while (--clk >= 0) + clk_disable_unprepare(plat->clks[clk]); + + return ret; +} + +static void mt2712_disable_clks(struct mediatek_dwmac_plat_data *plat) +{ + int clk; + + for (clk = DWMAC_CLK_MAX - 1; clk >= 0; clk--) + clk_disable_unprepare(plat->clks[clk]); +} + +static int mt2712_config_dt(struct mediatek_dwmac_plat_data *plat) +{ + u32 tx_delay, rx_delay; + + plat->peri_regmap = syscon_regmap_lookup_by_compatible("mediatek,mt2712-pericfg"); + if (IS_ERR(plat->peri_regmap)) { + dev_err(plat->dev, "Failed to get pericfg syscon\n"); + return PTR_ERR(plat->peri_regmap); + } + + if (!of_property_read_u32(plat->np, "tx-delay", &tx_delay)) { + if (tx_delay < plat->variant->tx_delay_max) { + plat->mac_delay.tx_delay = tx_delay; + } else { + dev_err(plat->dev, "Invalid TX clock delay: %d\n", tx_delay); + return -EINVAL; + } + } + + if (!of_property_read_u32(plat->np, "rx-delay", &rx_delay)) { + if (rx_delay < plat->variant->rx_delay_max) { + plat->mac_delay.rx_delay = rx_delay; + } else { + dev_err(plat->dev, "Invalid RX clock delay: %d\n", rx_delay); + return -EINVAL; + } + } + + plat->mac_delay.tx_inv = of_property_read_bool(plat->np, "txc-inverse"); + + plat->mac_delay.rx_inv = of_property_read_bool(plat->np, "rxc-inverse"); + + plat->fine_tune = of_property_read_bool(plat->np, "fine-tune"); + + plat->rmii_rxc = of_property_read_bool(plat->np, "rmii-rxc"); + + mt2712_set_interface(plat); + + mt2712_set_delay(plat); + + return mt2712_get_clks(plat); +} + +static const struct mediatek_dwmac_variant mt2712_gmac_variant = { + .dwmac_config_dt = mt2712_config_dt, + .dwmac_enable_clks = mt2712_enable_clks, + .dwmac_disable_clks = mt2712_disable_clks, + .rx_delay_max = 32, + .tx_delay_max = 32, +}; + +static int mediatek_dwmac_config_dt(struct mediatek_dwmac_plat_data *plat) +{ + const struct mediatek_dwmac_variant *variant = plat->variant; + + /* Set the DMA mask, 4GB mode enabled */ + dma_set_mask_and_coherent(plat->dev, DMA_BIT_MASK(33)); + + return variant->dwmac_config_dt(plat); +} + +static int mediatek_dwmac_init(struct platform_device *pdev, void *priv) +{ + struct mediatek_dwmac_plat_data *plat = priv; + const struct mediatek_dwmac_variant *variant = plat->variant; + + return variant->dwmac_enable_clks(plat); +} + +static void mediatek_dwmac_exit(struct platform_device *pdev, void *priv) +{ + struct mediatek_dwmac_plat_data *plat = priv; + const struct mediatek_dwmac_variant *variant = plat->variant; + + variant->dwmac_disable_clks(plat); +} + +static int mediatek_dwmac_probe(struct platform_device *pdev) +{ + int ret = 0; + struct plat_stmmacenet_data *plat_dat; + struct stmmac_resources stmmac_res; + struct mediatek_dwmac_plat_data *priv_plat; + + priv_plat = devm_kzalloc(&pdev->dev, sizeof(*priv_plat), GFP_KERNEL); + if (!priv_plat) + return -ENOMEM; + + priv_plat->variant = of_device_get_match_data(&pdev->dev); + if (!priv_plat->variant) { + dev_err(&pdev->dev, "Missing dwmac-mediatek variant\n"); + return -EINVAL; + } + + priv_plat->dev = &pdev->dev; + priv_plat->np = pdev->dev.of_node; + priv_plat->phy_mode = of_get_phy_mode(priv_plat->np); + + ret = mediatek_dwmac_config_dt(priv_plat); + if (ret) + return ret; + + ret = stmmac_get_platform_resources(pdev, &stmmac_res); + if (ret) + return ret; + + plat_dat = stmmac_probe_config_dt(pdev, &stmmac_res.mac); + if (IS_ERR(plat_dat)) + return PTR_ERR(plat_dat); + + plat_dat->interface = priv_plat->phy_mode; + /* clk_csr_i = 250-300MHz & MDC = clk_csr_i/124 */ + plat_dat->clk_csr = 5; + plat_dat->has_gmac4 = 1; + plat_dat->has_gmac = 0; + plat_dat->pmt = 0; + plat_dat->maxmtu = ETH_DATA_LEN; + plat_dat->bsp_priv = priv_plat; + plat_dat->init = mediatek_dwmac_init; + plat_dat->exit = mediatek_dwmac_exit; + mediatek_dwmac_init(pdev, priv_plat); + + ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res); + if (ret) { + stmmac_remove_config_dt(pdev, plat_dat); + return ret; + } + + return 0; +} + +static const struct of_device_id mediatek_dwmac_match[] = { + { .compatible = "mediatek,mt2712-gmac", + .data = &mt2712_gmac_variant }, + { } +}; + +MODULE_DEVICE_TABLE(of, mediatek_dwmac_match); + +static struct platform_driver mediatek_dwmac_driver = { + .probe = mediatek_dwmac_probe, + .remove = stmmac_pltfr_remove, + .driver = { + .name = "dwmac-mediatek", + .pm = &stmmac_pltfr_pm_ops, + .of_match_table = mediatek_dwmac_match, + }, +}; +module_platform_driver(mediatek_dwmac_driver); From patchwork Fri Nov 16 09:18:46 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?QmlhbyBIdWFuZyAo6buE5b2qKQ==?= X-Patchwork-Id: 10685729 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AFAA4109C for ; Fri, 16 Nov 2018 09:19:23 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9EB702D1DA for ; Fri, 16 Nov 2018 09:19:23 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 92E482D1DF; 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Fri, 16 Nov 2018 17:18:53 +0800 Received: from localhost.localdomain (10.17.3.153) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Fri, 16 Nov 2018 17:18:52 +0800 From: Biao Huang To: , Subject: [v3, PATCH 2/2] dt-binding: mediatek-dwmac: add binding document for MediaTek MT2712 DWMAC Date: Fri, 16 Nov 2018 17:18:46 +0800 Message-ID: <1542359926-28800-2-git-send-email-biao.huang@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1542359926-28800-1-git-send-email-biao.huang@mediatek.com> References: <1542359926-28800-1-git-send-email-biao.huang@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181116_091915_314331_46DC0701 X-CRM114-Status: GOOD ( 17.76 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, devicetree@vger.kernel.org, nelson.chang@mediatek.com, andrew@lunn.ch, biao.huang@mediatek.com, netdev@vger.kernel.org, liguo.zhang@mediatek.com, linux-kernel@vger.kernel.org, matthias.bgg@gmail.com, joabreu@synopsys.com, linux-mediatek@lists.infradead.org, honghui.zhang@mediatek.com, yt.shen@mediatek.com, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The commit adds the device tree binding documentation for the MediaTek DWMAC found on MediaTek MT2712. Change-Id: I3728666bf65927164bd82fa8dddb90df8270bd44 Signed-off-by: Biao Huang --- .../devicetree/bindings/net/mediatek-dwmac.txt | 77 ++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/mediatek-dwmac.txt diff --git a/Documentation/devicetree/bindings/net/mediatek-dwmac.txt b/Documentation/devicetree/bindings/net/mediatek-dwmac.txt new file mode 100644 index 0000000..7fd56e0 --- /dev/null +++ b/Documentation/devicetree/bindings/net/mediatek-dwmac.txt @@ -0,0 +1,77 @@ +MediaTek DWMAC glue layer controller + +This file documents platform glue layer for stmmac. +Please see stmmac.txt for the other unchanged properties. + +The device node has following properties. + +Required properties: +- compatible: Should be "mediatek,mt2712-gmac" for MT2712 SoC +- reg: Address and length of the register set for the device +- interrupts: Should contain the MAC interrupts +- interrupt-names: Should contain a list of interrupt names corresponding to + the interrupts in the interrupts property, if available. + Should be "macirq" for the main MAC IRQ +- clocks: Must contain a phandle for each entry in clock-names. +- clock-names: The name of the clock listed in the clocks property. These are + "axi", "apb", "mac_ext", "mac_parent", "ptp_ref", "ptp_parent", "ptp_top" + for MT2712 SoC +- mac-address: See ethernet.txt in the same directory +- phy-mode: See ethernet.txt in the same directory + +Optional properties: +- tx-delay: TX clock delay macro value. Range is 0~31. Default is 0. + It should be defined for rgmii/rgmii-rxid/mii interface. +- rx-delay: RX clock delay macro value. Range is 0~31. Default is 0. + It should be defined for rgmii/rgmii-txid/mii/rmii interface. +- fine-tune: This property will select coarse-tune delay or fine delay + for rgmii interface. + If fine-tune delay is enabled, tx-delay/rx-delay is 170+/-50ps + per stage. + Else coarse-tune delay is enabled, tx-delay/rx-delay is 0.55+/-0.2ns + per stage. + This property do not apply to non-rgmii PHYs. + Only coarse-tune delay is supported for mii/rmii PHYs. +- rmii-rxc: Reference clock of rmii is from external PHYs, + and it can be connected to TXC or RXC pin on MT2712 SoC. + If ref_clk <--> TXC, disable it. + Else ref_clk <--> RXC, enable it. +- txc-inverse: Inverse tx clock for mii/rgmii. + Inverse tx clock inside MAC relative to reference clock for rmii, + and it rarely happen. +- rxc-inverse: Inverse rx clock for mii/rgmii interfaces. + Inverse reference clock for rmii. + +Example: + eth: ethernet@1101c000 { + compatible = "mediatek,mt2712-gmac"; + reg = <0 0x1101c000 0 0x1300>; + interrupts = ; + interrupt-names = "macirq"; + phy-mode ="rgmii-id"; + mac-address = [00 55 7b b5 7d f7]; + clock-names = "axi", + "apb", + "mac_ext", + "mac_parent", + "ptp_ref", + "ptp_parent", + "ptp_top"; + clocks = <&pericfg CLK_PERI_GMAC>, + <&pericfg CLK_PERI_GMAC_PCLK>, + <&topckgen CLK_TOP_ETHER_125M_SEL>, + <&topckgen CLK_TOP_ETHERPLL_125M>, + <&topckgen CLK_TOP_ETHER_50M_SEL>, + <&topckgen CLK_TOP_APLL1_D3>, + <&topckgen CLK_TOP_APLL1>; + snps,txpbl = <32>; + snps,rxpbl = <32>; + snps,reset-gpio = <&pio 87 GPIO_ACTIVE_LOW>; + snps,reset-active-low; + tx-delay = <9>; + rx-delay = <9>; + fine-tune; + rmii-rxc; + txc-inverse; + rxc-inverse; + };