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[v11,1/6] mfd: khadas-mcu: Add per-variant configuration infrastructure and VIM4 support

Message ID 20260902-add-mcu-fan-khadas-vim4-v11-1-5f1610d83bf0@aliel.fr
State New
Headers show
Series Add VIM4 MCU/FAN support | expand

Commit Message

Ronald Claveau via B4 Relay Sept. 2, 2026, 12:51 p.m. UTC 
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(+)
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Patch

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 */