linux-kernel - [PATCH v2 0/9] clk: realtek: Add RTD1625 Clock Support

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Message-ID: <20260113112333.821-1-eleanor.lin@realtek.com>
Date: Tue, 13 Jan 2026 19:23:23 +0800
From: Yu-Chun Lin <eleanor.lin@...ltek.com>
To: <mturquette@...libre.com>, <sboyd@...nel.org>, <robh@...nel.org>,
        <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <p.zabel@...gutronix.de>,
        <cylee12@...ltek.com>, <jyanchou@...ltek.com>
CC: <devicetree@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <james.tai@...ltek.com>,
        <cy.huang@...ltek.com>, <stanley_chang@...ltek.com>,
        <eleanor.lin@...ltek.com>
Subject: [PATCH v2 0/9] clk: realtek: Add RTD1625 Clock Support

Hello,

This patch series adds clock support for Realtek's RTD1625 platform

The series includes:

1. Infrastructure: reset controller, basic clocks, PLLs, gate clocks, mux
clocks, and MMC-tuned PLLs.

2. Platform drivers: two clock controller drivers for RTD1625-CRT and
RTD1625-ISO.

I welcome feedback and suggestions.

Best regards,
Yu-Chun Lin
---
Changes in v2:
- General: Added missing Co-developed-by tags.
- Patch 1:
  - Shortened binding description.
  - Updated MAINTAINERS entry (BINDINGS -> DRIVERS).
  - Moved software variables from header to driver.
- Patch 2:
  - Added missing maintainer entry for driver/clk.
  - Removed explicit of_xlate/of_reset_n_cells assignment as it matches defaults.
  - Added error handling for rtk_reset_read() return value
- Patch 3:
  - Fixed coding style issues.
  - Switched to using dev_err_probe() return value.
  - Fixed format specifier (%zu instead of %lu) reported by kernel test robot.
- Patch 4:
  - Fixed clk_pll_determine_rate() to properly update req->rate.
- Patch 5:
  - Added error handling for regmap_update_bits.
  - Removed .disable_unused callback in gate ops. The CCF handles the fallback to
    .disable automatically if .disable_unused is not present.
- Patch 6:
  - Fixed return value signedness issue in clk_regmap_mux_get_parent (reported by
    smatch/Dan Carpenter).
- Patch 7
  - Replaced eval_ssc_div_n() function with a macro.
  - Removed clk_pll_mmc_disable_unused() and clk_pll_mmc_unprepare_unused()
    callbacks to rely on CCF default behavior and avoid unnecessary function calls.
  - Fixed clk_pll_mmc_determine_rate() to properly write the calculated rate into
    req->rate.
- Patch 8:
  - Fixed Kconfig indentation.
  - Removed excessive CLK_IGNORE_UNUSED flags

Yu-Chun Lin (9):
  dt-bindings: clock: Add Realtek RTD1625 Clock & Reset Controller
  clk: realtek: Add basic reset support
  clk: realtek: Introduce a common probe()
  clk: realtek: Add support for phase locked loops (PLLs)
  clk: realtek: Add support for gate clock
  clk: realtek: Add support for mux clock
  clk: realtek: Add support for MMC-tuned PLL clocks
  clk: realtek: Add RTD1625-CRT clock controller driver
  clk: realtek: Add RTD1625-ISO clock controller driver

 .../bindings/clock/realtek,rtd1625-clk.yaml   |  51 ++
 MAINTAINERS                                   |  18 +
 drivers/clk/Kconfig                           |   1 +
 drivers/clk/Makefile                          |   1 +
 drivers/clk/realtek/Kconfig                   |  45 +
 drivers/clk/realtek/Makefile                  |  14 +
 drivers/clk/realtek/clk-pll-mmc.c             | 398 +++++++++
 drivers/clk/realtek/clk-pll.c                 | 193 +++++
 drivers/clk/realtek/clk-pll.h                 |  68 ++
 drivers/clk/realtek/clk-regmap-gate.c         |  66 ++
 drivers/clk/realtek/clk-regmap-gate.h         |  65 ++
 drivers/clk/realtek/clk-regmap-mux.c          |  46 +
 drivers/clk/realtek/clk-regmap-mux.h          |  43 +
 drivers/clk/realtek/clk-rtd1625-crt.c         | 790 ++++++++++++++++++
 drivers/clk/realtek/clk-rtd1625-iso.c         | 153 ++++
 drivers/clk/realtek/common.c                  |  68 ++
 drivers/clk/realtek/common.h                  |  40 +
 drivers/clk/realtek/freq_table.c              |  35 +
 drivers/clk/realtek/freq_table.h              |  23 +
 drivers/clk/realtek/reset.c                   | 125 +++
 drivers/clk/realtek/reset.h                   |  36 +
 .../dt-bindings/clock/realtek,rtd1625-clk.h   | 164 ++++
 22 files changed, 2443 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/clock/realtek,rtd1625-clk.yaml
 create mode 100644 drivers/clk/realtek/Kconfig
 create mode 100644 drivers/clk/realtek/Makefile
 create mode 100644 drivers/clk/realtek/clk-pll-mmc.c
 create mode 100644 drivers/clk/realtek/clk-pll.c
 create mode 100644 drivers/clk/realtek/clk-pll.h
 create mode 100644 drivers/clk/realtek/clk-regmap-gate.c
 create mode 100644 drivers/clk/realtek/clk-regmap-gate.h
 create mode 100644 drivers/clk/realtek/clk-regmap-mux.c
 create mode 100644 drivers/clk/realtek/clk-regmap-mux.h
 create mode 100644 drivers/clk/realtek/clk-rtd1625-crt.c
 create mode 100644 drivers/clk/realtek/clk-rtd1625-iso.c
 create mode 100644 drivers/clk/realtek/common.c
 create mode 100644 drivers/clk/realtek/common.h
 create mode 100644 drivers/clk/realtek/freq_table.c
 create mode 100644 drivers/clk/realtek/freq_table.h
 create mode 100644 drivers/clk/realtek/reset.c
 create mode 100644 drivers/clk/realtek/reset.h
 create mode 100644 include/dt-bindings/clock/realtek,rtd1625-clk.h

-- 
2.34.1