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thermal: khadas-mcu-fan: Add fan config from platform data Add regulator support

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Introduce platform name, control register and duty-cycle
levels per variant.
VIM4 uses a different register and level set (0-100)
 declared as a list (0, 30, 40, 55, 75, 100) compared
 to previous boards (0-3).

MAX_LEVEL is kept and bumped from 3 to 5 to make
the speed change more gradual with the newer MCUs.

The cooling device's state is stored as an index into levels[],
and khadas_mcu_fan_set_level() writes levels[state] to fan_reg,
rather than writing the raw state value as before.

Optionally acquire and enable a "fan" regulator supply
at probe time and on resume,
so boards that gate fan power through a regulator are handled.
The regulator is released via a devm_add_action_or_reset()
callback.

Signed-off-by: Ronald Claveau <linux-kernel-dev@aliel.fr>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Daniel Lezcano <daniel.lezcano@oss.qualcomm.com>
Link: https://patch.msgid.link/20260917-add-mcu-fan-khadas-vim4-v12-4-497cd543a148@aliel.fr
Signed-off-by: Lee Jones <lee@kernel.org>
This commit is contained in:
Ronald Claveau 2026-09-17 09:59:03 +02:00 committed by Lee Jones
parent c94c97f8c9
commit dad6f7897a
1 changed files with 86 additions and 22 deletions
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108
drivers/thermal/khadas_mcu_fan.c
View File

@ -13,34 +13,33 @@
#include <linux/regmap.h>
#include <linux/sysfs.h>
#include <linux/thermal.h>
#include <linux/regulator/consumer.h>
#include <linux/minmax.h>
#define MAX_LEVEL 3
#define MAX_LEVEL 5
struct khadas_mcu_fan_ctx {
struct khadas_mcu *mcu;
unsigned int fan_reg;
unsigned int level;
const unsigned int *levels;
unsigned int nlevels;
struct thermal_cooling_device *cdev;
struct regulator *power;
};
static int khadas_mcu_fan_set_level(struct khadas_mcu_fan_ctx *ctx,
unsigned int level)
{
int ret;
ret = regmap_write(ctx->mcu->regmap, KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG,
level);
if (ret)
return ret;
ctx->level = level;
return 0;
return regmap_write(ctx->mcu->regmap, ctx->fan_reg, level);
}
static int khadas_mcu_fan_get_max_state(struct thermal_cooling_device *cdev,
unsigned long *state)
{
*state = MAX_LEVEL;
struct khadas_mcu_fan_ctx *ctx = cdev->devdata;
*state = min_t(unsigned int, MAX_LEVEL, ctx->nlevels - 1);
return 0;
}
@ -60,14 +59,21 @@ khadas_mcu_fan_set_cur_state(struct thermal_cooling_device *cdev,
unsigned long state)
{
struct khadas_mcu_fan_ctx *ctx = cdev->devdata;
int ret;
if (state > MAX_LEVEL)
if (state > MAX_LEVEL || state >= ctx->nlevels)
return -EINVAL;
if (state == ctx->level)
return 0;
return khadas_mcu_fan_set_level(ctx, state);
ret = khadas_mcu_fan_set_level(ctx, ctx->levels[state]);
if (ret)
return ret;
ctx->level = state;
return 0;
}
static const struct thermal_cooling_device_ops khadas_mcu_fan_cooling_ops = {
@ -76,22 +82,71 @@ static const struct thermal_cooling_device_ops khadas_mcu_fan_cooling_ops = {
.set_cur_state = khadas_mcu_fan_set_cur_state,
};
static void khadas_mcu_fan_regulator_disable(void *data)
{
struct regulator *power = data;
regulator_disable(power);
}
static const unsigned int khadas_mcu_fan_levels[] = { 0, 1, 2, 3 };
static const unsigned int khadas_mcu_vim4_fan_levels[] = { 0, 30, 40, 55, 75, 100 };
static int khadas_mcu_fan_probe(struct platform_device *pdev)
{
const struct platform_device_id *id = platform_get_device_id(pdev);
struct khadas_mcu *mcu = dev_get_drvdata(pdev->dev.parent);
struct thermal_cooling_device *cdev;
struct device *dev = &pdev->dev;
struct khadas_mcu_fan_ctx *ctx;
int ret;
if (!dev->of_node)
dev->of_node = of_node_get(dev->parent->of_node);
if (!id)
return -EINVAL;
ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->mcu = mcu;
switch (id->driver_data) {
case KHADAS_MCU_GENERIC:
ctx->fan_reg = KHADAS_MCU_CMD_FAN_STATUS_CTRL_REG;
ctx->levels = khadas_mcu_fan_levels;
ctx->nlevels = ARRAY_SIZE(khadas_mcu_fan_levels);
break;
case KHADAS_MCU_VIM4:
ctx->fan_reg = KHADAS_MCU_VIM4_FAN_CTRL_REG;
ctx->levels = khadas_mcu_vim4_fan_levels;
ctx->nlevels = ARRAY_SIZE(khadas_mcu_vim4_fan_levels);
break;
default:
return -ENODEV;
}
ctx->power = devm_regulator_get(dev, "fan");
if (IS_ERR(ctx->power))
return PTR_ERR(ctx->power);
ret = regulator_enable(ctx->power);
if (ret) {
dev_err(dev, "Failed to enable fan power supply: %d\n", ret);
return ret;
}
ret = devm_add_action_or_reset(dev, khadas_mcu_fan_regulator_disable, ctx->power);
if (ret)
return ret;
platform_set_drvdata(pdev, ctx);
cdev = devm_thermal_of_child_cooling_device_register(dev->parent,
dev->parent->of_node,
cdev = devm_thermal_of_child_cooling_device_register(dev,
dev->of_node,
"khadas-mcu-fan", ctx,
&khadas_mcu_fan_cooling_ops);
if (IS_ERR(cdev)) {
@ -109,21 +164,24 @@ static void khadas_mcu_fan_shutdown(struct platform_device *pdev)
{
struct khadas_mcu_fan_ctx *ctx = platform_get_drvdata(pdev);
khadas_mcu_fan_set_level(ctx, 0);
khadas_mcu_fan_set_level(ctx, ctx->levels[0]);
}
#ifdef CONFIG_PM_SLEEP
static int khadas_mcu_fan_suspend(struct device *dev)
{
struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
unsigned int level_save = ctx->level;
int ret;
ret = khadas_mcu_fan_set_level(ctx, 0);
ret = khadas_mcu_fan_set_level(ctx, ctx->levels[0]);
if (ret)
return ret;
ctx->level = level_save;
ret = regulator_disable(ctx->power);
if (ret) {
khadas_mcu_fan_set_level(ctx, ctx->levels[ctx->level]);
return ret;
}
return 0;
}
@ -131,8 +189,13 @@ static int khadas_mcu_fan_suspend(struct device *dev)
static int khadas_mcu_fan_resume(struct device *dev)
{
struct khadas_mcu_fan_ctx *ctx = dev_get_drvdata(dev);
int ret;
return khadas_mcu_fan_set_level(ctx, ctx->level);
ret = regulator_enable(ctx->power);
if (ret)
return ret;
return khadas_mcu_fan_set_level(ctx, ctx->levels[ctx->level]);
}
#endif
@ -140,7 +203,8 @@ static SIMPLE_DEV_PM_OPS(khadas_mcu_fan_pm, khadas_mcu_fan_suspend,
khadas_mcu_fan_resume);
static const struct platform_device_id khadas_mcu_fan_id_table[] = {
{ .name = "khadas-mcu-fan-ctrl", },
{ .name = "khadas-mcu-fan-ctrl", .driver_data = KHADAS_MCU_GENERIC },
{ .name = "khadas-mcu-vim4-fan", .driver_data = KHADAS_MCU_VIM4 },
{},
};
MODULE_DEVICE_TABLE(platform, khadas_mcu_fan_id_table);