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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Yixun Lan , Maxime Coquelin , Alexandre Torgue , Richard Cochran , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , "Russell King (Oracle)" , Yao Zi , Yanteng Si , Vladimir Oltean , Lad Prabhakar , Shangjuan Wei , Inochi Amaoto , Maxime Chevallier , Chen-Yu Tsai , Boon Khai Ng , Quentin Schulz , Giuseppe Cavallaro , Jose Abreu Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, Yixun Lan , Longbin Li Subject: [PATCH net-next v8 1/3] dt-bindings: net: Add support for Spacemit K3 dwmac Date: Mon, 9 Mar 2026 08:42:42 +0800 Message-ID: <20260309004305.315018-2-inochiama@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260309004305.315018-1-inochiama@gmail.com> References: <20260309004305.315018-1-inochiama@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The GMAC IP on Spacemit K3 is almost a standard Synopsys DesignWare MAC (version 5.40a) with some extra clock. Add necessary compatible string for this device. Signed-off-by: Inochi Amaoto Reviewed-by: Rob Herring (Arm) --- .../devicetree/bindings/net/snps,dwmac.yaml | 2 + .../bindings/net/spacemit,k3-dwmac.yaml | 102 ++++++++++++++++++ 2 files changed, 104 insertions(+) create mode 100644 Documentation/devicetree/bindings/net/spacemit,k3-dwmac= .yaml diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Docume= ntation/devicetree/bindings/net/snps,dwmac.yaml index 38bc34dc4f09..98ebb6276bc6 100644 --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml @@ -109,6 +109,7 @@ properties: - snps,dwmac-5.10a - snps,dwmac-5.20 - snps,dwmac-5.30a + - snps,dwmac-5.40a - snps,dwxgmac - snps,dwxgmac-2.10 - sophgo,sg2042-dwmac @@ -656,6 +657,7 @@ allOf: - snps,dwmac-5.10a - snps,dwmac-5.20 - snps,dwmac-5.30a + - snps,dwmac-5.40a - snps,dwxgmac - snps,dwxgmac-2.10 - st,spear600-gmac diff --git a/Documentation/devicetree/bindings/net/spacemit,k3-dwmac.yaml b= /Documentation/devicetree/bindings/net/spacemit,k3-dwmac.yaml new file mode 100644 index 000000000000..678eccf044f9 --- /dev/null +++ b/Documentation/devicetree/bindings/net/spacemit,k3-dwmac.yaml @@ -0,0 +1,102 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/net/spacemit,k3-dwmac.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: Spacemit K3 DWMAC glue layer + +maintainers: + - Inochi Amaoto + +select: + properties: + compatible: + contains: + const: spacemit,k3-dwmac + required: + - compatible + +properties: + compatible: + items: + - const: spacemit,k3-dwmac + - const: snps,dwmac-5.40a + + reg: + maxItems: 1 + + clocks: + items: + - description: GMAC application clock + - description: PTP clock + - description: TX clock + + clock-names: + items: + - const: stmmaceth + - const: ptp_ref + - const: tx + + interrupts: + minItems: 1 + items: + - description: MAC interrupt + - description: MAC wake interrupt + + interrupt-names: + minItems: 1 + items: + - const: macirq + - const: eth_wake_irq + + resets: + maxItems: 1 + + reset-names: + const: stmmaceth + + spacemit,apmu: + $ref: /schemas/types.yaml#/definitions/phandle-array + items: + - items: + - description: phandle to the syscon node which control the glue= register + - description: offset of the control register + - description: offset of the dline register + description: + A phandle to syscon with offset to control registers for this MAC + +required: + - compatible + - reg + - clocks + - clock-names + - interrupts + - interrupt-names + - resets + - reset-names + - spacemit,apmu + +allOf: + - $ref: snps,dwmac.yaml# + +unevaluatedProperties: false + +examples: + - | + #include + + ethernet@cac80000 { + compatible =3D "spacemit,k3-dwmac", "snps,dwmac-5.40a"; + reg =3D <0xcac80000 0x2000>; + clocks =3D <&syscon_apmu 66>, <&syscon_apmu 68>, + <&syscon_apmu 69>; + clock-names =3D "stmmaceth", "ptp_ref", "tx"; + interrupts =3D <131 IRQ_TYPE_LEVEL_HIGH>, <276 IRQ_TYPE_LEVEL_HIGH>; + interrupt-names =3D "macirq", "eth_wake_irq"; + phy-mode =3D "rgmii-id"; + phy-handle =3D <&phy0>; + resets =3D <&syscon_apmu 67>; + reset-names =3D "stmmaceth"; + spacemit,apmu =3D <&syscon_apmu 0x384 0x38c>; + }; --=20 2.53.0 From nobody Thu Apr 9 13:42:36 2026 Received: from mail-pf1-f179.google.com (mail-pf1-f179.google.com [209.85.210.179]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ED4D6237180 for ; Mon, 9 Mar 2026 00:43:46 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.179 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773017028; cv=none; b=brZCLhMow+H/Bs+CyvR1fuLps20CHisBdE5k9Cb+VMT4Le+GAdbsJOUPhopIGTHWjXczPUQ67hWUuodidT3jOvY3+gMNkPXvwzgg0RZAVVKYFlBf9GiGcCqDeEYoUrEm21Ego0tb3kPM2nR5lGPB5Kcy3TR+1lJJK6+fnkvSbuU= ARC-Message-Signature: i=1; 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Sun, 08 Mar 2026 17:43:46 -0700 (PDT) Received: from localhost ([2001:19f0:8001:1b2d:5400:5ff:fefa:a95d]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-829a4656f43sm10324424b3a.16.2026.03.08.17.43.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Mar 2026 17:43:45 -0700 (PDT) From: Inochi Amaoto To: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Yixun Lan , Maxime Coquelin , Alexandre Torgue , Richard Cochran , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , "Russell King (Oracle)" , Yao Zi , Yanteng Si , Vladimir Oltean , Lad Prabhakar , Shangjuan Wei , Inochi Amaoto , Maxime Chevallier , Chen-Yu Tsai , Boon Khai Ng , Quentin Schulz , Giuseppe Cavallaro , Jose Abreu Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, Yixun Lan , Longbin Li Subject: [PATCH net-next v8 2/3] net: stmmac: platform: Add snps,dwmac-5.40a IP compatible string Date: Mon, 9 Mar 2026 08:42:43 +0800 Message-ID: <20260309004305.315018-3-inochiama@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260309004305.315018-1-inochiama@gmail.com> References: <20260309004305.315018-1-inochiama@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Add compatible string for 5.40a version that can avoid to define some platform data in the glue layer. Signed-off-by: Inochi Amaoto Reviewed-by: Russell King (Oracle) --- drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/driver= s/net/ethernet/stmicro/stmmac/stmmac_platform.c index 5c9fd91a1db9..02303a808fb5 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c @@ -396,6 +396,7 @@ static const char * const stmmac_gmac4_compats[] =3D { "snps,dwmac-5.10a", "snps,dwmac-5.20", "snps,dwmac-5.30a", + "snps,dwmac-5.40a", NULL }; =20 --=20 2.53.0 From nobody Thu Apr 9 13:42:36 2026 Received: from mail-pl1-f181.google.com (mail-pl1-f181.google.com [209.85.214.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E03B8242D9D for ; Mon, 9 Mar 2026 00:43:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Sun, 08 Mar 2026 17:43:49 -0700 (PDT) Received: from localhost ([2001:19f0:8001:1b2d:5400:5ff:fefa:a95d]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2ae83e57740sm88653645ad.15.2026.03.08.17.43.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 08 Mar 2026 17:43:48 -0700 (PDT) From: Inochi Amaoto To: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Yixun Lan , Maxime Coquelin , Alexandre Torgue , Richard Cochran , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , "Russell King (Oracle)" , Yao Zi , Yanteng Si , Vladimir Oltean , Lad Prabhakar , Shangjuan Wei , Inochi Amaoto , Maxime Chevallier , Chen-Yu Tsai , Boon Khai Ng , Quentin Schulz , Giuseppe Cavallaro , Jose Abreu Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, spacemit@lists.linux.dev, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, Yixun Lan , Longbin Li Subject: [PATCH net-next v8 3/3] net: stmmac: Add glue layer for Spacemit K3 SoC Date: Mon, 9 Mar 2026 08:42:44 +0800 Message-ID: <20260309004305.315018-4-inochiama@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260309004305.315018-1-inochiama@gmail.com> References: <20260309004305.315018-1-inochiama@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The ethernet controller on Spacemit K3 SoC is Synopsys DesignWare MAC (version 5.40a), with the following special points: 1. The rate of the tx clock line is auto changed when the mac speed rate is changed, and no need for changing the input tx clock. 2. This controller require a extra syscon device to configure the interface type, enable wake up interrupt and delay configuration if needed. Add Spacemit dwmac driver support on the Spacemit K3 SoC. Signed-off-by: Inochi Amaoto Reviewed-by: Russell King (Oracle) --- drivers/net/ethernet/stmicro/stmmac/Kconfig | 12 + drivers/net/ethernet/stmicro/stmmac/Makefile | 1 + .../ethernet/stmicro/stmmac/dwmac-spacemit.c | 227 ++++++++++++++++++ 3 files changed, 240 insertions(+) create mode 100644 drivers/net/ethernet/stmicro/stmmac/dwmac-spacemit.c diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethe= rnet/stmicro/stmmac/Kconfig index 07088d03dbab..d3a6ab7383fc 100644 --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig @@ -216,6 +216,18 @@ config DWMAC_SOPHGO for the stmmac device driver. This driver is used for the ethernet controllers on various Sophgo SoCs. =20 +config DWMAC_SPACEMIT + tristate "Spacemit dwmac support" + depends on OF && (ARCH_SPACEMIT || COMPILE_TEST) + select MFD_SYSCON + default m if ARCH_SPACEMIT + help + Support for ethernet controllers on Spacemit RISC-V SoCs + + This selects the Spacemit platform specific glue layer support + for the stmmac device driver. This driver is used for the + Spacemit K3 ethernet controllers. + config DWMAC_STARFIVE tristate "StarFive dwmac support" depends on OF && (ARCH_STARFIVE || COMPILE_TEST) diff --git a/drivers/net/ethernet/stmicro/stmmac/Makefile b/drivers/net/eth= ernet/stmicro/stmmac/Makefile index c9263987ef8d..945c5354eced 100644 --- a/drivers/net/ethernet/stmicro/stmmac/Makefile +++ b/drivers/net/ethernet/stmicro/stmmac/Makefile @@ -27,6 +27,7 @@ obj-$(CONFIG_DWMAC_RZN1) +=3D dwmac-rzn1.o obj-$(CONFIG_DWMAC_S32) +=3D dwmac-s32.o obj-$(CONFIG_DWMAC_SOCFPGA) +=3D dwmac-altr-socfpga.o obj-$(CONFIG_DWMAC_SOPHGO) +=3D dwmac-sophgo.o +obj-$(CONFIG_DWMAC_SPACEMIT) +=3D dwmac-spacemit.o obj-$(CONFIG_DWMAC_STARFIVE) +=3D dwmac-starfive.o obj-$(CONFIG_DWMAC_STI) +=3D dwmac-sti.o obj-$(CONFIG_DWMAC_STM32) +=3D dwmac-stm32.o diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-spacemit.c b/drivers= /net/ethernet/stmicro/stmmac/dwmac-spacemit.c new file mode 100644 index 000000000000..f6379ae6e858 --- /dev/null +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-spacemit.c @@ -0,0 +1,227 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Spacemit DWMAC platform driver + * + * Copyright (C) 2026 Inochi Amaoto + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "stmmac_platform.h" + +/* ctrl register bits */ +#define CTRL_PHY_INTF_RGMII BIT(3) +#define CTRL_PHY_INTF_MII BIT(4) +#define CTRL_WAKE_IRQ_EN BIT(9) +#define CTRL_PHY_IRQ_EN BIT(12) + +/* dline register bits */ +#define RGMII_RX_DLINE_EN BIT(0) +#define RGMII_RX_DLINE_STEP GENMASK(5, 4) +#define RGMII_RX_DLINE_CODE GENMASK(15, 8) +#define RGMII_TX_DLINE_EN BIT(16) +#define RGMII_TX_DLINE_STEP GENMASK(21, 20) +#define RGMII_TX_DLINE_CODE GENMASK(31, 24) + +#define MAX_DLINE_DELAY_CODE 0xff +#define MAX_WORKED_DELAY 2800 +/* Note: the delay step value is at 0.1ps */ +#define K3_DELAY_STEP 367 + +struct spacmit_dwmac { + struct regmap *apmu; + unsigned int ctrl_offset; + unsigned int dline_offset; +}; + +static int spacemit_dwmac_set_delay(struct spacmit_dwmac *dwmac, + unsigned int tx_code, unsigned int rx_code) +{ + unsigned int mask, val; + + mask =3D RGMII_TX_DLINE_STEP | RGMII_TX_DLINE_CODE | RGMII_TX_DLINE_EN | + RGMII_RX_DLINE_STEP | RGMII_RX_DLINE_CODE | RGMII_RX_DLINE_EN; + + /* + * Since the delay step provided by config 0 is small enough, and + * it can cover the range of the valid delay, so there is no needed + * to use other step config. + */ + val =3D FIELD_PREP(RGMII_TX_DLINE_STEP, 0) | + FIELD_PREP(RGMII_TX_DLINE_CODE, tx_code) | RGMII_TX_DLINE_EN | + FIELD_PREP(RGMII_RX_DLINE_STEP, 0) | + FIELD_PREP(RGMII_RX_DLINE_CODE, rx_code) | RGMII_RX_DLINE_EN; + + return regmap_update_bits(dwmac->apmu, dwmac->dline_offset, + mask, val); +} + +static int spacemit_dwmac_detected_delay_value(unsigned int delay) +{ + if (delay =3D=3D 0) + return 0; + + if (delay > MAX_WORKED_DELAY) + return -EINVAL; + + /* + * Note K3 require a specific factor for calculate + * the delay, in this scenario it is 0.9. So the + * formula is code * step / 10 * 0.9 + */ + return DIV_ROUND_CLOSEST(delay * 10 * 10, K3_DELAY_STEP * 9); +} + +static int spacemit_dwmac_fix_delay(struct spacmit_dwmac *dwmac, + unsigned int tx_delay, + unsigned int rx_delay) +{ + int rx_code; + int tx_code; + + rx_code =3D spacemit_dwmac_detected_delay_value(rx_delay); + if (rx_code < 0) + return rx_code; + + tx_code =3D spacemit_dwmac_detected_delay_value(tx_delay); + if (tx_code < 0) + return tx_code; + + return spacemit_dwmac_set_delay(dwmac, tx_code, rx_code); +} + +static int spacemit_dwmac_update_irq_config(struct spacmit_dwmac *dwmac, + struct stmmac_resources *stmmac_res) +{ + unsigned int mask =3D CTRL_WAKE_IRQ_EN; + unsigned int val =3D stmmac_res->wol_irq >=3D 0 ? CTRL_WAKE_IRQ_EN : 0; + + return regmap_update_bits(dwmac->apmu, dwmac->ctrl_offset, + mask, val); +} + +static void spacemit_get_interfaces(struct stmmac_priv *priv, void *bsp_pr= iv, + unsigned long *interfaces) +{ + __set_bit(PHY_INTERFACE_MODE_MII, interfaces); + __set_bit(PHY_INTERFACE_MODE_RMII, interfaces); + phy_interface_set_rgmii(interfaces); +} + +static int spacemit_set_phy_intf_sel(void *bsp_priv, u8 phy_intf_sel) +{ + struct spacmit_dwmac *dwmac =3D bsp_priv; + unsigned int mask =3D CTRL_PHY_INTF_MII | CTRL_PHY_INTF_RGMII; + unsigned int val =3D 0; + + switch (phy_intf_sel) { + case PHY_INTF_SEL_GMII_MII: + val =3D CTRL_PHY_INTF_MII; + break; + + case PHY_INTF_SEL_RMII: + break; + + case PHY_INTF_SEL_RGMII: + val =3D CTRL_PHY_INTF_RGMII; + break; + + default: + return -EINVAL; + } + + return regmap_update_bits(dwmac->apmu, dwmac->ctrl_offset, + mask, val); +} + +static int spacemit_dwmac_probe(struct platform_device *pdev) +{ + struct plat_stmmacenet_data *plat_dat; + struct stmmac_resources stmmac_res; + struct device *dev =3D &pdev->dev; + struct spacmit_dwmac *dwmac; + unsigned int offset[2]; + struct regmap *apmu; + struct clk *clk_tx; + u32 rx_delay =3D 0; + u32 tx_delay =3D 0; + int ret; + + ret =3D stmmac_get_platform_resources(pdev, &stmmac_res); + if (ret) + return dev_err_probe(dev, ret, + "failed to get platform resources\n"); + + dwmac =3D devm_kzalloc(&pdev->dev, sizeof(*dwmac), GFP_KERNEL); + if (!dwmac) + return -ENOMEM; + + plat_dat =3D devm_stmmac_probe_config_dt(pdev, stmmac_res.mac); + if (IS_ERR(plat_dat)) + return dev_err_probe(dev, PTR_ERR(plat_dat), + "failed to parse DT parameters\n"); + + clk_tx =3D devm_clk_get_enabled(&pdev->dev, "tx"); + if (IS_ERR(clk_tx)) + return dev_err_probe(&pdev->dev, PTR_ERR(clk_tx), + "failed to get tx clock\n"); + + apmu =3D syscon_regmap_lookup_by_phandle_args(pdev->dev.of_node, + "spacemit,apmu", 2, + offset); + if (IS_ERR(apmu)) + return dev_err_probe(dev, PTR_ERR(apmu), + "Failed to get apmu regmap\n"); + + dwmac->apmu =3D apmu; + dwmac->ctrl_offset =3D offset[0]; + dwmac->dline_offset =3D offset[1]; + + ret =3D spacemit_dwmac_update_irq_config(dwmac, &stmmac_res); + if (ret) + return dev_err_probe(dev, ret, "Failed to configure irq config\n"); + + of_property_read_u32(pdev->dev.of_node, "tx-internal-delay-ps", + &tx_delay); + of_property_read_u32(pdev->dev.of_node, "rx-internal-delay-ps", + &rx_delay); + + plat_dat->get_interfaces =3D spacemit_get_interfaces; + plat_dat->set_phy_intf_sel =3D spacemit_set_phy_intf_sel; + plat_dat->bsp_priv =3D dwmac; + + ret =3D spacemit_dwmac_fix_delay(dwmac, tx_delay, rx_delay); + if (ret) + return dev_err_probe(dev, ret, "Failed to configure delay\n"); + + return stmmac_dvr_probe(dev, plat_dat, &stmmac_res); +} + +static const struct of_device_id spacemit_dwmac_match[] =3D { + { .compatible =3D "spacemit,k3-dwmac" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, spacemit_dwmac_match); + +static struct platform_driver spacemit_dwmac_driver =3D { + .probe =3D spacemit_dwmac_probe, + .remove =3D stmmac_pltfr_remove, + .driver =3D { + .name =3D "spacemit-dwmac", + .pm =3D &stmmac_pltfr_pm_ops, + .of_match_table =3D spacemit_dwmac_match, + }, +}; +module_platform_driver(spacemit_dwmac_driver); + +MODULE_AUTHOR("Inochi Amaoto "); +MODULE_DESCRIPTION("Spacemit DWMAC platform driver"); +MODULE_LICENSE("GPL"); --=20 2.53.0