[PATCH v10 1/6] 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,
	 mfd@lists.linux.dev, Ronald Claveau <linux-kernel-dev@aliel.fr>
Subject: [PATCH v10 1/6] mfd: khadas-mcu: Add per-variant configuration infrastructure and VIM4 support
Date: Tue, 01 Sep 2026 17:25:52 +0200	[thread overview]
Message-ID: <20260901-add-mcu-fan-khadas-vim4-v10-1-aecdb9955a30@aliel.fr> (raw)
In-Reply-To: <20260901-add-mcu-fan-khadas-vim4-v10-0-aecdb9955a30@aliel.fr>

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

Some values change per variant, add the structure to manage it.

Add VIM4 specific registers done for a subsequent patch, which will use a
new compatible especially to get the right regmap config.

Add an enum khadas_mcu_type used as value to match.

Also introduce khadas_mcu_fan_pdata to pass fan register address, a
table named levels to get fan-supported levels on the MCU, and the number
of levels to the fan sub-driver. Done in preparation for a subsequent
commit.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Ronald Claveau <linux-kernel-dev@aliel.fr>
---
 include/linux/mfd/khadas-mcu.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/include/linux/mfd/khadas-mcu.h b/include/linux/mfd/khadas-mcu.h
index a99ba2ed0e4e0..7a9980ea63e7e 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,
@@ -88,4 +95,21 @@ struct khadas_mcu {
 	struct regmap *regmap;
 };
 
+/**
+ * struct khadas_mcu_fan_pdata - fan sub-driver configuration
+ * @fan_reg: register address to write the fan level
+ * @levels: table mapping logical cooling-device states to raw fan levels
+ * @nlevels: number of entries in @levels
+ */
+struct khadas_mcu_fan_pdata {
+	unsigned int fan_reg;
+	const unsigned int *levels;
+	unsigned int nlevels;
+};
+
+enum khadas_mcu_type {
+	KHADAS_MCU_GENERIC = 1, /* VIM1/2/3, Edge, Edge-V */
+	KHADAS_MCU_VIM4,
+};
+
 #endif /* MFD_KHADAS_MCU_H */

-- 
2.49.0



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