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[60.250.196.139]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2beb58b3bb6sm88798165ad.47.2026.05.25.01.21.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 25 May 2026 01:21:11 -0700 (PDT) From: a0282524688@gmail.com To: tmyu0@nuvoton.com, linusw@kernel.org, brgl@kernel.org, linux@roeck-us.net, andi.shyti@kernel.org, lee@kernel.org, mkl@pengutronix.de, mailhol@kernel.org, alexandre.belloni@bootlin.com, wim@linux-watchdog.org Cc: linux-kernel@vger.kernel.org, linux-gpio@vger.kernel.org, linux-i2c@vger.kernel.org, linux-can@vger.kernel.org, netdev@vger.kernel.org, linux-watchdog@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-rtc@vger.kernel.org, linux-usb@vger.kernel.org, Ming Yu Subject: [PATCH v5 0/7] mfd: nct6694: Refactor transport layer and add HIF (eSPI) support Date: Mon, 25 May 2026 16:20:49 +0800 Message-Id: <20260525082049.2906283-1-a0282524688@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-can@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Ming Yu The Nuvoton NCT6694 is a peripheral expander that provides GPIO, I2C, CAN-FD, Watchdog, HWMON, PWM, and RTC sub-devices. Currently, the driver only supports USB as the host transport interface. This series refactors the NCT6694 MFD core to support multiple transport backends and adds a new Host Interface (HIF) transport driver that communicates over eSPI using Super-I/O shared memory. Changes since version 4: - Split the monolithic refactoring and HIF support patch into a series of smaller, logical commits to improve reviewability and adhere to the single logical change principle. - Decoupled USB-specific data into a dedicated 'nct6694_usb_data' structure. - Abstracted device I/O operations by introducing 'read_msg' and 'write_msg' function pointers in the core structure. - Renamed the existing driver to 'nct6694-usb.c' to strictly identify its transport boundary, alongside Kconfig/Makefile updates. - Extracted transport-agnostic device management (IRQ domain setup, IDA initialization, and MFD cell registration) into a standalone 'nct6694-core.c' module. - Added the 'nct6694-hif' eSPI transport driver clean on top of the new core abstraction. Changes since version 3: - Remove redundant module type macro definitions from sub-device drivers that are now provided by the shared header , fixing -Wmacro-redefined warnings. Changes since version 2: - Restore per-device IDA and mfd_add_hotplug_devices()/PLATFORM_DEVID_AUTO to avoid child device ID conflicts with multiple NCT6694 chips. - Validate irq_find_mapping() return value before dispatching IRQs. - Check superio_enter() return value in nct6694_irq_init(). Changes since version 1: - Reworked the Super-I/O access helpers. Ming Yu (7): mfd: nct6694: Move module type macros to shared header mfd: nct6694: Refactor USB-specific data into nct6694_usb_data mfd: nct6694: Introduce transport abstraction with function pointers mfd: nct6694: Rename static I/O functions with _usb_ prefix mfd: nct6694: Rename driver to nct6694-usb and update Kconfig mfd: nct6694: Extract core device management into a separate module mfd: nct6694: Add Host Interface (HIF) eSPI transport driver MAINTAINERS | 2 +- drivers/gpio/gpio-nct6694.c | 7 - drivers/hwmon/nct6694-hwmon.c | 21 - drivers/i2c/busses/i2c-nct6694.c | 7 - drivers/mfd/Kconfig | 38 +- drivers/mfd/Makefile | 4 +- drivers/mfd/nct6694-core.c | 136 ++++++ drivers/mfd/nct6694-hif.c | 529 +++++++++++++++++++++++ drivers/mfd/{nct6694.c => nct6694-usb.c} | 185 +++----- drivers/net/can/usb/nct6694_canfd.c | 6 - drivers/rtc/rtc-nct6694.c | 7 - drivers/watchdog/nct6694_wdt.c | 7 - include/linux/mfd/nct6694.h | 63 ++- 13 files changed, 821 insertions(+), 191 deletions(-) create mode 100644 drivers/mfd/nct6694-core.c create mode 100644 drivers/mfd/nct6694-hif.c rename drivers/mfd/{nct6694.c => nct6694-usb.c} (62%) -- 2.34.1