[PATCH v4 3/8] mfd: khadas-mcu: Add per-variant configuration infrastructure and VIM4 support

From: Ronald Claveau via B4 Relay <devnull+linux-kernel-dev.aliel.fr@kernel.org>
To: Neil Armstrong <neil.armstrong@linaro.org>,
	Lee Jones <lee@kernel.org>,  Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	 Conor Dooley <conor+dt@kernel.org>,
	Andi Shyti <andi.shyti@kernel.org>,
	 Kevin Hilman <khilman@baylibre.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	 Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
	 Beniamino Galvani <b.galvani@gmail.com>,
	 "Rafael J. Wysocki" <rafael@kernel.org>,
	 Daniel Lezcano <daniel.lezcano@kernel.org>,
	Zhang Rui <rui.zhang@intel.com>,
	 Lukasz Luba <lukasz.luba@arm.com>,
	Liam Girdwood <lgirdwood@gmail.com>,
	 Mark Brown <broonie@kernel.org>
Cc: linux-amlogic@lists.infradead.org, devicetree@vger.kernel.org,
	 linux-kernel@vger.kernel.org, linux-i2c@vger.kernel.org,
	 linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org,
	 Ronald Claveau <linux-kernel-dev@aliel.fr>
Subject: [PATCH v4 3/8] mfd: khadas-mcu: Add per-variant configuration infrastructure and VIM4 support
Date: Tue, 21 Apr 2026 13:49:20 +0200	[thread overview]
Message-ID: <20260421-add-mcu-fan-khadas-vim4-v4-3-447114a28f2d@aliel.fr> (raw)
In-Reply-To: <20260421-add-mcu-fan-khadas-vim4-v4-0-447114a28f2d@aliel.fr>

From: Ronald Claveau <linux-kernel-dev@aliel.fr>

Introduce a per-variant configuration structure (khadas_mcu_data)
holding the regmap config and MFD cells,
selected at probe time via the of_device_id match data.
This makes adding other variants straightforward.

Also introduce khadas_mcu_fan_pdata to pass fan register address and
maximum level to the fan sub-driver, removing the hardcoded constants.

Signed-off-by: Ronald Claveau <linux-kernel-dev@aliel.fr>
---
 include/linux/mfd/khadas-mcu.h | 39 +++++++++++++++++++++++++++++++++++++--
 1 file changed, 37 insertions(+), 2 deletions(-)

diff --git a/include/linux/mfd/khadas-mcu.h b/include/linux/mfd/khadas-mcu.h
index a99ba2ed0e4e0..75e275d3fa8d9 100644
--- a/include/linux/mfd/khadas-mcu.h
+++ b/include/linux/mfd/khadas-mcu.h
@@ -70,6 +70,13 @@
 #define KHADAS_MCU_WOL_INIT_START_REG		0x87 /* WO */
 #define KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG	0x88 /* WO */
 
+/* VIM4 specific registers */
+#define KHADAS_MCU_VIM4_REST_CONF_REG		0x2c /* WO - reset EEPROM */
+#define KHADAS_MCU_VIM4_LED_ON_RAM_REG		0x89 /* WO - LED volatile */
+#define KHADAS_MCU_VIM4_FAN_CTRL_REG		0x8a /* WO */
+#define KHADAS_MCU_VIM4_WDT_EN_REG		0x8b /* WO */
+#define KHADAS_MCU_VIM4_SYS_RST_REG		0x91 /* WO */
+
 enum {
 	KHADAS_BOARD_VIM1 = 0x1,
 	KHADAS_BOARD_VIM2,
@@ -82,10 +89,38 @@ enum {
  * struct khadas_mcu - Khadas MCU structure
  * @device:		device reference used for logs
  * @regmap:		register map
+ * @data:		pointer to variant-specific config
  */
 struct khadas_mcu {
-	struct device *dev;
-	struct regmap *regmap;
+	struct device			*dev;
+	struct regmap			*regmap;
+	const struct khadas_mcu_data	*data;
+};
+
+/**
+ * struct khadas_mcu_data - per-variant configuration
+ * @regmap_config:	regmap configuration
+ * @cells:		MFD sub-devices
+ * @ncells:		number of sub-devices
+ * @fan_cells:		MFD fan sub-devices
+ * @nfan_cells:		number of fan sub-devices
+ */
+struct khadas_mcu_data {
+	const struct regmap_config	*regmap_config;
+	const struct mfd_cell		*cells;
+	int				ncells;
+	const struct mfd_cell		*fan_cells;
+	int				nfan_cells;
+};
+
+/**
+ * struct khadas_mcu_fan_pdata - fan sub-driver configuration
+ * @fan_reg: register address to write the fan level
+ * @max_level: maximum fan level
+ */
+struct khadas_mcu_fan_pdata {
+	unsigned int fan_reg;
+	unsigned int max_level;
 };
 
 #endif /* MFD_KHADAS_MCU_H */

-- 
2.49.0



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