[PATCH v7 0/2] Add driver support for Eswin EIC7700 SoC SATA PHY

[Yulin Lu]

Updates:
  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  |  58 +++++
 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          | 221 ++++++++++++++++++
 6 files changed, 297 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

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2.25.1