linux-kernel - [PATCH v5 0/2] Add driver support for ESWIN eic7700 SoC reset controller

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Message-Id: <20250725093249.669-1-dongxuyang@eswincomputing.com>
Date: Fri, 25 Jul 2025 17:32:48 +0800
From: dongxuyang@...incomputing.com
To: p.zabel@...gutronix.de,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: ningyu@...incomputing.com,
	linmin@...incomputing.com,
	huangyifeng@...incomputing.com,
	pinkesh.vaghela@...fochips.com,
	Xuyang Dong <dongxuyang@...incomputing.com>
Subject: [PATCH v5 0/2] Add driver support for ESWIN eic7700 SoC reset controller

From: Xuyang Dong <dongxuyang@...incomputing.com>

Updates:

  dt-bindings: reset: eswin: Documentation for eic7700 SoC
  v4 -> v5:
    1. Dropped EIC7700_RESET_MAX from bindings.
    2. Add "Reviewed-by" tag of "Krzysztof Kozlowski" for Patch 1.
    3. Corrected the link to previous versions.
    Link to v4: https://lore.kernel.org/all/20250715121427.1466-1-dongxuyang@eswincomputing.com/

  v3 -> v4:
    1. Remove register offsets in dt-bindings.
    2. The const value of "#reset-cell" was changed from 2 to 1.
       Because the offsets were removed from dt-bindings. There are
       only IDs. And removed the description of it.
    3. Modify copyright year from 2024 to 2025.
    4. Redefined the IDs in the dt-bindings and used these to build a
       reset array in reset driver. Ensure that the reset register and
       reset value corresponding to the IDs are correct.
    Link to v3: https://lore.kernel.org/all/20250619075811.1230-1-dongxuyang@eswincomputing.com/

  v2 -> v3:
    1. Drop syscon and simple-mfd from yaml and code, because these are
       not necessary.
    2. Update description to introduce reset controller.
    3. Add reset control indices for dt-bindings.
    4. Keep the register offsets in dt-bindings.
    Link to v2: https://lore.kernel.org/all/20250619075811.1230-1-dongxuyang@eswincomputing.com/

  v1 -> v2:
    1. Clear warnings/errors for using "make dt_binding_check".
    2. Update example, change parent node from sys-crg to reset-controller
       for reset yaml.
    3. Drop the child node and add '#reset-cells' to the parent node.
    4. Drop the description, because sys-crg block is changed to reset-
       controller.
    5. Change hex numbers to decimal numbers going from 0, and drop the
       not needed hardware numbers.
    Link to v1: https://lore.kernel.org/all/20250619075811.1230-1-dongxuyang@eswincomputing.com/

  reset: eswin: Add eic7700 reset driver
  v4 -> v5:
    1. The value of .max_register is 0x7fffc.
    2. Converted "to_eswin_reset_data" from macro to inline function.
    3. Modified EIC7700_RESET_OFFSET to EIC7700_RESET and eic7700_
       register_offset to eic7700_reset.
    4. Since EIC7700_RESET_MAX is dropped, used eic7700_reset[] without
       EIC7700_RESET_MAX.
    5. Removed function eswin_reset_set, and put regmap_clear_bits in
       eswin_reset_assert and regmap_set_bits in eswin_reset_deassert.
    6. Added usleep_range in function eswin_reset_reset which was missed.
    7. Used ARRAY_SIZE(eic7700_reset) for data->rcdev.nr_resets.
    8. Use builtin_platform_driver, because reset driver is a reset
       controller for SoC. Removed eswin_reset_init function.
    9. Modified eswin_reset_* to eic7700_reset_*.
    Link to v4: https://lore.kernel.org/all/20250715121427.1466-1-dongxuyang@eswincomputing.com/

  v3 -> v4:
    1. Add 'const' for the definition. It is 'const struct of_phandle_
       args *reset_spec = data;'.
    2. Modify copyright year from 2024 to 2025.
    3. Included "eswin,eic7700-reset.h" in reset driver.
    4. Added mapping table for reset IDs.
    5. Removed of_xlate and idr functions as we are using IDs from DTS.
    6. Removed .remove function.
    Link to v3: https://lore.kernel.org/all/20250619075811.1230-1-dongxuyang@eswincomputing.com/

  v2 -> v3:
    1. Change syscon_node_to_regmap() to MMIO regmap functions, because
       dropped syscon.
    2. Add BIT() in function eswin_reset_set() to shift the reset
       control indices.
    3. Remove forced type conversions from function eswin_reset_of_
       xlate_lookup_id().
    Link to v2: https://lore.kernel.org/all/20250619075811.1230-1-dongxuyang@eswincomputing.com/

  v1 -> v2:
    1. Modify the code according to the suggestions.
    2. Use eswin_reset_assert() and eswin_reset_deassert in function
       eswin_reset_reset().
    3. Place RESET_EIC7700 in Kconfig and Makefile in order.
    4. Use dev_err_probe() in probe function.
    Link to v1: https://lore.kernel.org/all/20250619075811.1230-1-dongxuyang@eswincomputing.com/

Xuyang Dong (2):
  dt-bindings: reset: eswin: Documentation for eic7700 SoC
  reset: eswin: Add eic7700 reset driver

 .../bindings/reset/eswin,eic7700-reset.yaml   |  42 ++
 drivers/reset/Kconfig                         |  10 +
 drivers/reset/Makefile                        |   1 +
 drivers/reset/reset-eic7700.c                 | 432 ++++++++++++++++++
 .../dt-bindings/reset/eswin,eic7700-reset.h   | 298 ++++++++++++
 5 files changed, 783 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/reset/eswin,eic7700-reset.yaml
 create mode 100644 drivers/reset/reset-eic7700.c
 create mode 100644 include/dt-bindings/reset/eswin,eic7700-reset.h

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2.17.1