[PATCH v8 0/2] Add driver support for Eswin EIC7700 SoC SATA PHY

[PATCH v8 0/2] Add driver support for Eswin EIC7700 SoC SATA PHY

[Yulin Lu]

Updates:
  v8 -> v7:
    - eswin,eic7700-sata-phy.yaml
      - Add "eswin,tx-amplitude-tuning" and "eswin,tx-preemph-tuning"
        properties, because these parameters may vary across different
        circuit boards.
      - Delete reviewed-by tag of Krzysztof Kozlowski, because the tuning
        properties are introduced.
    - phy-eic7700-sata.c
      - Try to get SATA PHY transmitter amplitude and pre-emphasis signal
        eye diagram tuning parameters from dts instead of hardcoded values
        in the code. Because, these parameters may vary across different
        circuit boards. Define default tuning parameters and use it when
        these properties are not declared in dts.
      - Add a comment to explain the reason for mapping I/O resources with
        platform_get_resource and devm_ioremap instead of using the
        devm_platform_ioremap_resource API.
    - Link to v7: https://lore.kernel.org/lkml/20260106062944.1529-1-luyulin@eswincomputing.com/

  v7 -> v6:
    - phy-eic7700-sata.c
      - Rename PHY_READY_TIMEOUT to PLL_LOCK_TIMEOUT_US with value 1000.
      - Add macro PLL_LOCK_SLEEP_US set to 10.
      - Add "goto disable_clk" in the eic7700_sata_phy_init function.
      - Modify Copyright year from 2024 to 2026.
    - Link to v6: https://lore.kernel.org/lkml/20251201060737.868-1-luyulin@eswincomputing.com/

  v6 -> v5:
    - eswin,eic7700-ahci.yaml
      - Delete this file and it has already been applied in reply[1].
    - eswin,eic7700-sata-phy.yaml
      - Add clock and reset related properties.
    - phy-eic7700-sata.c
      - Map the io resource with platform_get_resource and devm_ioremap
        instead of devm_platform_ioremap_resource API. Because the address
        region of sata-phy falls into the region of hsp clock&reset which
        has been got by hsp clock&reset driver.
      - Use regmap_read_poll_timeout in wait_for_phy_ready to replace the
        while loop check.
      - Use devm_regmap_init_mmio and regmap_write to replace writel.
      - Adapt to the clock and reset driver framework, replacing the
        original readl and writel.
        Because we are implementing the HSP layer clock and reset drivers,
        the corresponding clock and reset registers can be registered into
        the driver framework. And I have tested on the Sifive HiFive
        Premier P550 board.
    - Link to v5: https://lore.kernel.org/lkml/20250930083754.15-1-luyulin@eswincomputing.com/

  v5 -> v4:
    - eswin,eic7700-ahci.yaml
      - Add "dt-bindings: ata:" prefix to the subject.
      - Wrap at 80 characters in the YAML description field.
    - Link to v4: https://lore.kernel.org/lkml/20250915125902.375-1-luyulin@eswincomputing.com/

  v4 -> v3:
    - eswin,eic7700-ahci.yaml
      - Fix grammatical errors in patch subject and commit message
      - Add an explanation in the commit message of patch 1 for retaining
        the "ports-implemented" field, which Rob Herring suggested to
        remove in the review comments on v2.
        Link to Rob Herring's review:
        https://lore.kernel.org/lkml/CAL_JsqKFotNLZZXwiy7S6K8qXLdGRAnsa-1zvZRDQBE39Gf5kg@mail.gmail.com/
        Link to my question and Niklas Cassel's reply:
        https://lore.kernel.org/lkml/aLBUC116MdJqDGIJ@flawful.org/
        In this reply, Niklas Cassel mentioned his view:
        If the ports-implemented register gets reset from
        ahci_platform_assert_rsts(), then it seems acceptable to
        retain the ports-implemented property in the device tree.
        This aligns with our design.
        Link to my reply:
        https://lore.kernel.org/lkml/4ab70c6a.8be.198f47da494.Coremail.luyulin@eswincomputing.com/
        Link to Niklas Cassel's question and my further explanation:
        https://lore.kernel.org/lkml/aLlYkZWBaI5Yz6fo@ryzen/
        https://lore.kernel.org/lkml/7206383a.d98.19918c22570.Coremail.luyulin@eswincomputing.com/
    - eswin,eic7700-sata-phy.yaml
      - Fix grammatical errors in patch subject and commit message
      - Adjust the position of reg in the properties and required arrays
      - Add reviewed-by tag of Krzysztof Kozlowski
    - phy-eic7700-sata.c
      - Correct the loop condition in wait_for_phy_ready() to use the
        current jiffies instead of the fixed start time.
      - Change the return value from -EFAULT to -ETIMEDOUT to correctly
        indicate a timeout condition.
      - Remove redundant clock disable handling in probe error path, as
        SATA_SYS_CLK_EN is managed in phy_init() and phy_exit().
      - Use dev_err_probe return in probe.
      - Reorder local variables to follow reverse Xmas tree order.
      - Wrap each line in the extended comments to 80 columns before
        splitting lines.
      - Adjust the position of `#include <linux/io.h>` for proper ordering.
    - Link to v3: https://lore.kernel.org/lkml/20250904063427.1954-1-luyulin@eswincomputing.com/

  v2 -> v3:
    - Use full name in "From" and "Signed-off-by" fields information
    - eswin,eic7700-ahci.yaml
      - Remove the introduction to the reg, interrupts, phys, and
        phy-names fields.
      - Modify the usage of the clocks field in the examples.
      - Correct the order of dt properties.
    - phy-eic7700-sata.c
      - Register operations use the GENMASK macro and FIELD_PREP instead
        of the original bit offset method, and add
        "#include <linux/bitfield.h>".
      - Modify some macro definition names.
      - Remove the redundant initialization assignments for "ret" and
        "val".
      - Delete ".suppress_bind_attrs = true".
      - Modify the driver name.
      - Add "#include <linux/io.h>" to fix the robot test issue.
    - Link to v2: https://lore.kernel.org/lkml/20250819134722.220-1-luyulin@eswincomputing.com/

  v2 -> v1:
    - Delete the original controller driver and use ahci_dwc.c instead.
    - Add eswin,eic7700-ahci.yaml
      - Correct the descriptions of reset, interrupt and other hardware
        resources for the sata controller on EIC7700 SoC.
      - The clocks for both sata controller and sata PHY are controlled
        via a register bit in the HSP bus and are not registered in the
        clock tree. Clock are managed within the PHY driver, therefore it
        is not described in this document.
      - Add $ref: snps,dwc-ahci-common.yaml#.
    - Add eswin,eic7700-sata-phy.yaml
      - Add this file to include the description of the PHY on EIC7700 SoC.
    - Add an eswin directory under the PHY driver path, and include the
      SATA PHY driver code for EIC7700 SoC.
    - Link to v1: https://lore.kernel.org/all/20250515085114.1692-1-hehuan1@eswincomputing.com/

Yulin Lu (2):
  dt-bindings: phy: eswin: Document the EIC7700 SoC SATA PHY
  phy: eswin: Create eswin directory and add EIC7700 SATA PHY driver

 .../bindings/phy/eswin,eic7700-sata-phy.yaml  |  96 ++++++
 drivers/phy/Kconfig                           |   1 +
 drivers/phy/Makefile                          |   1 +
 drivers/phy/eswin/Kconfig                     |  14 +
 drivers/phy/eswin/Makefile                    |   2 +
 drivers/phy/eswin/phy-eic7700-sata.c          | 273 ++++++++++++++++++
 6 files changed, 387 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/eswin,eic7700-sata-phy.yaml
 create mode 100644 drivers/phy/eswin/Kconfig
 create mode 100644 drivers/phy/eswin/Makefile
 create mode 100644 drivers/phy/eswin/phy-eic7700-sata.c

-- 
2.25.1


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[PATCH v8 1/2] dt-bindings: phy: eswin: Document the EIC7700 SoC SATA PHY

[Yulin Lu]

Document the SATA PHY on the EIC7700 SoC platform,
describing its usage.

Signed-off-by: Yulin Lu <luyulin@eswincomputing.com>
---
 .../bindings/phy/eswin,eic7700-sata-phy.yaml  | 96 +++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/phy/eswin,eic7700-sata-phy.yaml

diff --git a/Documentation/devicetree/bindings/phy/eswin,eic7700-sata-phy.yaml b/Documentation/devicetree/bindings/phy/eswin,eic7700-sata-phy.yaml
new file mode 100644
index 000000000000..4bb2d7a53761
--- /dev/null
+++ b/Documentation/devicetree/bindings/phy/eswin,eic7700-sata-phy.yaml
@@ -0,0 +1,96 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/phy/eswin,eic7700-sata-phy.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Eswin EIC7700 SoC SATA PHY
+
+maintainers:
+  - Yulin Lu <luyulin@eswincomputing.com>
+  - Huan He <hehuan1@eswincomputing.com>
+
+properties:
+  compatible:
+    const: eswin,eic7700-sata-phy
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+  clock-names:
+    const: phy
+
+  resets:
+    maxItems: 2
+
+  reset-names:
+    items:
+      - const: port
+      - const: phy
+
+  eswin,tx-amplitude-tuning:
+    description: This adjusts the transmitter amplitude signal, and its value
+      is derived from eye diagram tuning. The three values correspond to Gen1,
+      Gen2, and Gen3 parameters respectively.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    items:
+      - description: Gen1 parameter.
+        minimum: 0
+        maximum: 0x7f
+        default: 0
+      - description: Gen2 parameter.
+        minimum: 0
+        maximum: 0x7f
+        default: 0
+      - description: Gen3 parameter.
+        minimum: 0
+        maximum: 0x7f
+        default: 0
+
+  eswin,tx-preemph-tuning:
+    description: This adjusts the transmitter de-emphasis signal, and its value
+      is derived from eye diagram tuning. The three values correspond to Gen1,
+      Gen2, and Gen3 parameters respectively.
+    $ref: /schemas/types.yaml#/definitions/uint32-array
+    items:
+      - description: Gen1 parameter.
+        minimum: 0
+        maximum: 0x3f
+        default: 0
+      - description: Gen2 parameter.
+        minimum: 0
+        maximum: 0x3f
+        default: 0
+      - description: Gen3 parameter.
+        minimum: 0
+        maximum: 0x3f
+        default: 0
+
+  "#phy-cells":
+    const: 0
+
+required:
+  - compatible
+  - reg
+  - clocks
+  - clock-names
+  - resets
+  - reset-names
+  - "#phy-cells"
+
+additionalProperties: false
+
+examples:
+  - |
+    sata-phy@50440300 {
+        compatible = "eswin,eic7700-sata-phy";
+        reg = <0x50440300 0x40>;
+        clocks = <&hspcrg 17>;
+        clock-names = "phy";
+        resets = <&hspcrg 0>, <&hspcrg 1>;
+        reset-names = "port", "phy";
+        #phy-cells = <0>;
+    };
-- 
2.25.1


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[PATCH v8 2/2] phy: eswin: Create eswin directory and add EIC7700 SATA PHY driver

[Yulin Lu]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: Type: text/plain; charset=y, Size: 10758 bytes --]

Create the eswin phy driver directory and add support for the
SATA PHY driver on the EIC7700 SoC platform.

Signed-off-by: Yulin Lu <luyulin@eswincomputing.com>
---
 drivers/phy/Kconfig                  |   1 +
 drivers/phy/Makefile                 |   1 +
 drivers/phy/eswin/Kconfig            |  14 ++
 drivers/phy/eswin/Makefile           |   2 +
 drivers/phy/eswin/phy-eic7700-sata.c | 273 +++++++++++++++++++++++++++
 5 files changed, 291 insertions(+)
 create mode 100644 drivers/phy/eswin/Kconfig
 create mode 100644 drivers/phy/eswin/Makefile
 create mode 100644 drivers/phy/eswin/phy-eic7700-sata.c

diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 678dd0452f0a..6d50704917f0 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -105,6 +105,7 @@ source "drivers/phy/allwinner/Kconfig"
 source "drivers/phy/amlogic/Kconfig"
 source "drivers/phy/broadcom/Kconfig"
 source "drivers/phy/cadence/Kconfig"
+source "drivers/phy/eswin/Kconfig"
 source "drivers/phy/freescale/Kconfig"
 source "drivers/phy/hisilicon/Kconfig"
 source "drivers/phy/ingenic/Kconfig"
diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile
index bfb27fb5a494..482a143d3417 100644
--- a/drivers/phy/Makefile
+++ b/drivers/phy/Makefile
@@ -17,6 +17,7 @@ obj-y					+= allwinner/	\
 					   amlogic/	\
 					   broadcom/	\
 					   cadence/	\
+					   eswin/	\
 					   freescale/	\
 					   hisilicon/	\
 					   ingenic/	\
diff --git a/drivers/phy/eswin/Kconfig b/drivers/phy/eswin/Kconfig
new file mode 100644
index 000000000000..37447cc3af63
--- /dev/null
+++ b/drivers/phy/eswin/Kconfig
@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Phy drivers for ESWIN platforms
+#
+config PHY_EIC7700_SATA
+	tristate "eic7700 Sata SerDes/PHY driver"
+	depends on ARCH_ESWIN || COMPILE_TEST
+	depends on HAS_IOMEM
+	select GENERIC_PHY
+	help
+	  Enable this to support SerDes/Phy found on ESWIN's
+	  EIC7700 SoC.This Phy supports SATA 1.5 Gb/s,
+	  SATA 3.0 Gb/s, SATA 6.0 Gb/s speeds.
+	  It supports one SATA host port to accept one SATA device.
diff --git a/drivers/phy/eswin/Makefile b/drivers/phy/eswin/Makefile
new file mode 100644
index 000000000000..db08c66be812
--- /dev/null
+++ b/drivers/phy/eswin/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-$(CONFIG_PHY_EIC7700_SATA)	+= phy-eic7700-sata.o
diff --git a/drivers/phy/eswin/phy-eic7700-sata.c b/drivers/phy/eswin/phy-eic7700-sata.c
new file mode 100644
index 000000000000..4de8dfe18182
--- /dev/null
+++ b/drivers/phy/eswin/phy-eic7700-sata.c
@@ -0,0 +1,273 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ESWIN SATA PHY driver
+ *
+ * Copyright 2026, Beijing ESWIN Computing Technology Co., Ltd..
+ * All rights reserved.
+ *
+ * Authors: Yulin Lu <luyulin@eswincomputing.com>
+ */
+
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+
+#define SATA_AXI_LP_CTRL			0x08
+#define SATA_MPLL_CTRL				0x20
+#define SATA_P0_PHY_STAT			0x24
+#define SATA_PHY_CTRL0				0x28
+#define SATA_PHY_CTRL1				0x2c
+#define SATA_REF_CTRL				0x34
+#define SATA_REF_CTRL1				0x38
+#define SATA_LOS_IDEN				0x3c
+
+#define SATA_CLK_RST_SOURCE_PHY			BIT(0)
+#define SATA_P0_PHY_TX_AMPLITUDE_GEN1_MASK	GENMASK(6, 0)
+#define SATA_P0_PHY_TX_AMPLITUDE_GEN1_DEFAULT	0x42
+#define SATA_P0_PHY_TX_AMPLITUDE_GEN2_MASK	GENMASK(14, 8)
+#define SATA_P0_PHY_TX_AMPLITUDE_GEN2_DEFAULT	0x46
+#define SATA_P0_PHY_TX_AMPLITUDE_GEN3_MASK	GENMASK(22, 16)
+#define SATA_P0_PHY_TX_AMPLITUDE_GEN3_DEFAULT	0x73
+#define SATA_P0_PHY_TX_PREEMPH_GEN1_MASK	GENMASK(5, 0)
+#define SATA_P0_PHY_TX_PREEMPH_GEN1_DEFAULT	0x5
+#define SATA_P0_PHY_TX_PREEMPH_GEN2_MASK	GENMASK(13, 8)
+#define SATA_P0_PHY_TX_PREEMPH_GEN2_DEFAULT	0x5
+#define SATA_P0_PHY_TX_PREEMPH_GEN3_MASK	GENMASK(21, 16)
+#define SATA_P0_PHY_TX_PREEMPH_GEN3_DEFAULT	0x23
+#define SATA_LOS_LEVEL_MASK			GENMASK(4, 0)
+#define SATA_LOS_BIAS_MASK			GENMASK(18, 16)
+#define SATA_M_CSYSREQ				BIT(0)
+#define SATA_S_CSYSREQ				BIT(16)
+#define SATA_REF_REPEATCLK_EN			BIT(0)
+#define SATA_REF_USE_PAD			BIT(20)
+#define SATA_MPLL_MULTIPLIER_MASK		GENMASK(22, 16)
+#define SATA_P0_PHY_READY			BIT(0)
+
+#define PLL_LOCK_SLEEP_US			10
+#define PLL_LOCK_TIMEOUT_US			1000
+
+struct eic7700_sata_phy {
+	u32 tx_amplitude_tuning_val[3];
+	u32 tx_preemph_tuning_val[3];
+	struct reset_control *rst;
+	struct regmap *regmap;
+	struct clk *clk;
+	struct phy *phy;
+};
+
+static const struct regmap_config eic7700_sata_phy_regmap_config = {
+	.reg_bits = 32,
+	.val_bits = 32,
+	.reg_stride = 4,
+	.max_register = SATA_LOS_IDEN,
+};
+
+static int wait_for_phy_ready(struct regmap *regmap, u32 reg, u32 checkbit,
+			      u32 status)
+{
+	u32 val;
+	int ret;
+
+	ret = regmap_read_poll_timeout(regmap, reg, val,
+				       (val & checkbit) == status,
+				       PLL_LOCK_SLEEP_US, PLL_LOCK_TIMEOUT_US);
+
+	return ret;
+}
+
+static int eic7700_sata_phy_init(struct phy *phy)
+{
+	struct eic7700_sata_phy *sata_phy = phy_get_drvdata(phy);
+	u32 val;
+	int ret;
+
+	ret = clk_prepare_enable(sata_phy->clk);
+	if (ret)
+		return ret;
+
+	regmap_write(sata_phy->regmap, SATA_REF_CTRL1, SATA_CLK_RST_SOURCE_PHY);
+
+	val = FIELD_PREP(SATA_P0_PHY_TX_AMPLITUDE_GEN1_MASK,
+			 sata_phy->tx_amplitude_tuning_val[0]) |
+	      FIELD_PREP(SATA_P0_PHY_TX_AMPLITUDE_GEN2_MASK,
+			 sata_phy->tx_amplitude_tuning_val[1]) |
+	      FIELD_PREP(SATA_P0_PHY_TX_AMPLITUDE_GEN3_MASK,
+			 sata_phy->tx_amplitude_tuning_val[2]);
+	regmap_write(sata_phy->regmap, SATA_PHY_CTRL0, val);
+
+	val = FIELD_PREP(SATA_P0_PHY_TX_PREEMPH_GEN1_MASK,
+			 sata_phy->tx_preemph_tuning_val[0]) |
+	      FIELD_PREP(SATA_P0_PHY_TX_PREEMPH_GEN2_MASK,
+			 sata_phy->tx_preemph_tuning_val[1]) |
+	      FIELD_PREP(SATA_P0_PHY_TX_PREEMPH_GEN3_MASK,
+			 sata_phy->tx_preemph_tuning_val[2]);
+	regmap_write(sata_phy->regmap, SATA_PHY_CTRL1, val);
+
+	val = FIELD_PREP(SATA_LOS_LEVEL_MASK, 0x9) |
+	      FIELD_PREP(SATA_LOS_BIAS_MASK, 0x2);
+	regmap_write(sata_phy->regmap, SATA_LOS_IDEN, val);
+
+	val = SATA_M_CSYSREQ | SATA_S_CSYSREQ;
+	regmap_write(sata_phy->regmap, SATA_AXI_LP_CTRL, val);
+
+	val = SATA_REF_REPEATCLK_EN | SATA_REF_USE_PAD;
+	regmap_write(sata_phy->regmap, SATA_REF_CTRL, val);
+
+	val = FIELD_PREP(SATA_MPLL_MULTIPLIER_MASK, 0x3c);
+	regmap_write(sata_phy->regmap, SATA_MPLL_CTRL, val);
+
+	usleep_range(15, 20);
+
+	ret = reset_control_deassert(sata_phy->rst);
+	if (ret)
+		goto disable_clk;
+
+	ret = wait_for_phy_ready(sata_phy->regmap, SATA_P0_PHY_STAT,
+				 SATA_P0_PHY_READY, 1);
+	if (ret < 0) {
+		dev_err(&sata_phy->phy->dev, "PHY READY check failed\n");
+		goto disable_clk;
+	}
+
+	return 0;
+
+disable_clk:
+	clk_disable_unprepare(sata_phy->clk);
+	return ret;
+}
+
+static int eic7700_sata_phy_exit(struct phy *phy)
+{
+	struct eic7700_sata_phy *sata_phy = phy_get_drvdata(phy);
+	int ret;
+
+	ret = reset_control_assert(sata_phy->rst);
+	if (ret)
+		return ret;
+
+	clk_disable_unprepare(sata_phy->clk);
+
+	return 0;
+}
+
+static const struct phy_ops eic7700_sata_phy_ops = {
+	.init		= eic7700_sata_phy_init,
+	.exit		= eic7700_sata_phy_exit,
+	.owner		= THIS_MODULE,
+};
+
+static void eic7700_get_tuning_param(struct device_node *np,
+				     struct eic7700_sata_phy *sata_phy)
+{
+	if (of_property_read_u32_array
+		(np, "eswin,tx-amplitude-tuning",
+		sata_phy->tx_amplitude_tuning_val,
+		ARRAY_SIZE(sata_phy->tx_amplitude_tuning_val))) {
+		sata_phy->tx_amplitude_tuning_val[0] =
+			SATA_P0_PHY_TX_AMPLITUDE_GEN1_DEFAULT;
+		sata_phy->tx_amplitude_tuning_val[1] =
+			SATA_P0_PHY_TX_AMPLITUDE_GEN2_DEFAULT;
+		sata_phy->tx_amplitude_tuning_val[2] =
+			SATA_P0_PHY_TX_AMPLITUDE_GEN3_DEFAULT;
+	}
+
+	if (of_property_read_u32_array
+		(np, "eswin,tx-preemph-tuning",
+		sata_phy->tx_preemph_tuning_val,
+		ARRAY_SIZE(sata_phy->tx_preemph_tuning_val))) {
+		sata_phy->tx_preemph_tuning_val[0] =
+			SATA_P0_PHY_TX_PREEMPH_GEN1_DEFAULT;
+		sata_phy->tx_preemph_tuning_val[1] =
+			SATA_P0_PHY_TX_PREEMPH_GEN2_DEFAULT;
+		sata_phy->tx_preemph_tuning_val[2] =
+			SATA_P0_PHY_TX_PREEMPH_GEN3_DEFAULT;
+	}
+}
+
+static int eic7700_sata_phy_probe(struct platform_device *pdev)
+{
+	struct eic7700_sata_phy *sata_phy;
+	struct phy_provider *phy_provider;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct resource *res;
+	void __iomem *regs;
+
+	sata_phy = devm_kzalloc(dev, sizeof(*sata_phy), GFP_KERNEL);
+	if (!sata_phy)
+		return -ENOMEM;
+
+	/*
+	 * Map the I/O resource with platform_get_resource and devm_ioremap
+	 * instead of the devm_platform_ioremap_resource API, because the
+	 * address region of the SATA‑PHY falls into the region of the HSP
+	 * clock & reset that has already been obtained by the HSP
+	 * clock‑and‑reset driver.
+	 */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENOENT;
+
+	regs = devm_ioremap(dev, res->start, resource_size(res));
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	sata_phy->regmap = devm_regmap_init_mmio
+			   (dev, regs, &eic7700_sata_phy_regmap_config);
+	if (IS_ERR(sata_phy->regmap))
+		return dev_err_probe(dev, PTR_ERR(sata_phy->regmap),
+				     "failed to init regmap\n");
+
+	dev_set_drvdata(dev, sata_phy);
+
+	eic7700_get_tuning_param(np, sata_phy);
+
+	sata_phy->clk = devm_clk_get(dev, "phy");
+	if (IS_ERR(sata_phy->clk))
+		return PTR_ERR(sata_phy->clk);
+
+	sata_phy->rst = devm_reset_control_array_get_exclusive(dev);
+	if (IS_ERR(sata_phy->rst))
+		return dev_err_probe(dev, PTR_ERR(sata_phy->rst),
+				     "failed to get reset control\n");
+
+	sata_phy->phy = devm_phy_create(dev, NULL, &eic7700_sata_phy_ops);
+	if (IS_ERR(sata_phy->phy))
+		return dev_err_probe(dev, PTR_ERR(sata_phy->phy),
+				     "failed to create PHY\n");
+
+	phy_set_drvdata(sata_phy->phy, sata_phy);
+
+	phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
+	if (IS_ERR(phy_provider))
+		return dev_err_probe(dev, PTR_ERR(phy_provider),
+				     "failed to register PHY provider\n");
+
+	return 0;
+}
+
+static const struct of_device_id eic7700_sata_phy_of_match[] = {
+	{ .compatible = "eswin,eic7700-sata-phy" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, eic7700_sata_phy_of_match);
+
+static struct platform_driver eic7700_sata_phy_driver = {
+	.probe	= eic7700_sata_phy_probe,
+	.driver = {
+		.of_match_table	= eic7700_sata_phy_of_match,
+		.name  = "eic7700-sata-phy",
+	}
+};
+module_platform_driver(eic7700_sata_phy_driver);
+
+MODULE_DESCRIPTION("SATA PHY driver for the ESWIN EIC7700 SoC");
+MODULE_AUTHOR("Yulin Lu <luyulin@eswincomputing.com>");
+MODULE_LICENSE("GPL");
-- 
2.25.1



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Re: [PATCH v8 1/2] dt-bindings: phy: eswin: Document the EIC7700 SoC SATA PHY

[Krzysztof Kozlowski]

On Fri, Jan 23, 2026 at 10:49:36AM +0800, Yulin Lu wrote:
> +  eswin,tx-amplitude-tuning:
> +    description: This adjusts the transmitter amplitude signal, and its value
> +      is derived from eye diagram tuning. The three values correspond to Gen1,
> +      Gen2, and Gen3 parameters respectively.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    items:
> +      - description: Gen1 parameter.
> +        minimum: 0
> +        maximum: 0x7f
> +        default: 0
> +      - description: Gen2 parameter.
> +        minimum: 0
> +        maximum: 0x7f
> +        default: 0
> +      - description: Gen3 parameter.
> +        minimum: 0
> +        maximum: 0x7f
> +        default: 0

I think defaults should be specified like this:
https://elixir.bootlin.com/linux/v6.19-rc5/source/Documentation/devicetree/bindings/sound/adi,adau7118.yaml#L54

> +
> +  eswin,tx-preemph-tuning:
> +    description: This adjusts the transmitter de-emphasis signal, and its value
> +      is derived from eye diagram tuning. The three values correspond to Gen1,
> +      Gen2, and Gen3 parameters respectively.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    items:
> +      - description: Gen1 parameter.
> +        minimum: 0
> +        maximum: 0x3f
> +        default: 0
> +      - description: Gen2 parameter.
> +        minimum: 0
> +        maximum: 0x3f
> +        default: 0
> +      - description: Gen3 parameter.
> +        minimum: 0
> +        maximum: 0x3f
> +        default: 0

Same here

Best regards,
Krzysztof


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