Hi,
> -----Original Message-----
> From: Jim Liu [mailto:jim.t90...@gmail.com]
> Sent: Tuesday, November 1, 2022 11:21 AM
> To: jim.t90...@gmail.com; jjl...@nuvoton.com; ys...@nuvoton.com;
> kw...@nuvoton.com;
> jh80.ch...@samsung.com
> Cc: u-boot@lists.denx.de
> Subject: [PATCH v1] power: regulator: Add support for NPCM845
>
> Add support for setting NPCM845 voltage supply
>
> regulator-force-microvolt is npcm proprietary property to
> set the voltage level.
What is regulator-force-microvolt. I didn't find this property in u-boot /
kernel side.
If I missed something, could you explain it?
And Is there no pmic for this regulator?
>
> Signed-off-by: Jim Liu <jjl...@nuvoton.com>
> ---
> drivers/power/regulator/Kconfig | 8 ++
> drivers/power/regulator/Makefile | 1 +
> drivers/power/regulator/npcm8xx_regulator.c | 133 ++++++++++++++++++++
> 3 files changed, 142 insertions(+)
> create mode 100644 drivers/power/regulator/npcm8xx_regulator.c
>
> diff --git a/drivers/power/regulator/Kconfig b/drivers/power/regulator/Kconfig
> index c519e066ef..e5f06874de 100644
> --- a/drivers/power/regulator/Kconfig
> +++ b/drivers/power/regulator/Kconfig
> @@ -128,6 +128,14 @@ config DM_REGULATOR_MAX77686
> features for REGULATOR MAX77686. The driver implements get/set api for:
> value, enable and mode.
>
> +config DM_REGULATOR_NPCM8XX
> + bool "Enable driver for NPCM8xx voltage supply"
"Enable Driver Model for ...."
> + depends on DM_REGULATOR && ARCH_NPCM8XX
> + help
> + Enable support for configuring voltage supply on NPCM8XX SoC. The
> + voltage supplies support two voltage levels and the driver implements
> + get/set api for setting the value.
> +
> config DM_REGULATOR_FAN53555
> bool "Enable Driver Model for REGULATOR FAN53555"
> depends on DM_PMIC_FAN53555
> diff --git a/drivers/power/regulator/Makefile
> b/drivers/power/regulator/Makefile
> index bc736068bc..68e4c0f9dd 100644
> --- a/drivers/power/regulator/Makefile
> +++ b/drivers/power/regulator/Makefile
> @@ -9,6 +9,7 @@ obj-$(CONFIG_REGULATOR_ACT8846) += act8846.o
> obj-$(CONFIG_REGULATOR_AS3722) += as3722_regulator.o
> obj-$(CONFIG_$(SPL_)DM_REGULATOR_DA9063) += da9063.o
> obj-$(CONFIG_DM_REGULATOR_MAX77686) += max77686.o
> +obj-$(CONFIG_DM_REGULATOR_NPCM8XX) += npcm8xx_regulator.o
> obj-$(CONFIG_$(SPL_)DM_PMIC_PFUZE100) += pfuze100.o
> obj-$(CONFIG_$(SPL_)DM_REGULATOR_BD71837) += bd71837.o
> obj-$(CONFIG_$(SPL_)DM_REGULATOR_PCA9450) += pca9450.o
> diff --git a/drivers/power/regulator/npcm8xx_regulator.c
> b/drivers/power/regulator/npcm8xx_regulator.c
> new file mode 100644
> index 0000000000..7903287132
> --- /dev/null
> +++ b/drivers/power/regulator/npcm8xx_regulator.c
> @@ -0,0 +1,133 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (c) 2022 Nuvoton Technology Corp.
> + */
> +
> +#include <common.h>
> +#include <dm.h>
> +#include <asm/io.h>
> +#include <dm/device_compat.h>
> +#include <power/regulator.h>
> +
> +#define REG_VSRCR 0xf08000e8 /* Voltage Supply Control Register */
> +
> +/* Supported voltage levels (uV) */
> +static const u32 volts_type1[] = { 3300000, 1800000 };
> +static const u32 volts_type2[] = { 1000000, 1800000 };
> +#define VOLT_LEV0 0
> +#define VOLT_LEV1 1
> +
> +struct volt_supply {
> + char *name;
> + const u32 *volts;
> + u32 reg_shift; /* Register bit offset for setting voltage */
> +};
> +
> +static const struct volt_supply npcm8xx_volt_supps[] = {
> + {"v1", volts_type1, 0},
> + {"v2", volts_type1, 1},
> + {"v3", volts_type1, 2},
> + {"v4", volts_type1, 3},
> + {"v5", volts_type1, 4},
> + {"v6", volts_type1, 5},
> + {"v7", volts_type1, 6},
> + {"v8", volts_type1, 7},
> + {"v9", volts_type1, 8},
> + {"v10", volts_type1, 9},
> + {"v11", volts_type2, 10},
> + {"v12", volts_type1, 11},
> + {"v13", volts_type1, 12},
> + {"v14", volts_type2, 13},
> + {"vsif", volts_type1, 14},
> + {"vr2", volts_type1, 30},
> +};
> +
> +static const struct volt_supply *npcm8xx_volt_supply_get(const char *name)
> +{
> + int i;
> +
> + for (i = 0; i < ARRAY_SIZE(npcm8xx_volt_supps); i++) {
> + if (!strcmp(npcm8xx_volt_supps[i].name, name))
> + return &npcm8xx_volt_supps[i];
> + }
> +
> + return NULL;
> +}
> +
> +static int npcm8xx_regulator_set_value(struct udevice *dev, int uV)
> +{
> + struct dm_regulator_uclass_plat *uc_pdata;
> + const struct volt_supply *supp;
> + u32 val, level;
> +
> + uc_pdata = dev_get_uclass_plat(dev);
> + if (!uc_pdata)
> + return -ENXIO;
> +
> + dev_dbg(dev, "%s set_value: %d\n", uc_pdata->name, uV);
> + supp = npcm8xx_volt_supply_get(uc_pdata->name);
> + if (!supp)
> + return -ENOENT;
> +
> + if (uV == supp->volts[VOLT_LEV0])
> + level = VOLT_LEV0;
> + else if (uV == supp->volts[VOLT_LEV1])
> + level = VOLT_LEV1;
> + else
> + return -EINVAL;
> +
> + /* Set voltage level */
> + val = readl(REG_VSRCR);
> + val &= ~BIT(supp->reg_shift);
> + val |= level << supp->reg_shift;
> + writel(val, REG_VSRCR);
> +
> + return 0;
> +}
> +
> +static int npcm8xx_regulator_get_value(struct udevice *dev)
> +{
> + struct dm_regulator_uclass_plat *uc_pdata;
> + const struct volt_supply *supp;
> + u32 val;
> +
> + uc_pdata = dev_get_uclass_plat(dev);
> + if (!uc_pdata)
> + return -ENXIO;
> +
> + supp = npcm8xx_volt_supply_get(uc_pdata->name);
> + if (!supp)
> + return -ENOENT;
> +
> + val = readl(REG_VSRCR) & BIT(supp->reg_shift);
To Readable, add the one line.
> + dev_dbg(dev, "%s get_value: %d\n", uc_pdata->name,
> + val ? supp->volts[VOLT_LEV1] : supp->volts[VOLT_LEV0]);
> + if (val)
> + return supp->volts[VOLT_LEV1];
> + else
> + return supp->volts[VOLT_LEV0];
Return val ? supp->volts[VOLT_LEV1] : ...;
> +}
> +
> +static int npcm8xx_regulator_set_enable(struct udevice *dev, bool enable)
> +{
> + /* Always on */
> + return 0;
> +}
> +
> +static const struct dm_regulator_ops npcm8xx_regulator_ops = {
> + .set_value = npcm8xx_regulator_set_value,
> + .get_value = npcm8xx_regulator_get_value,
> + .set_enable = npcm8xx_regulator_set_enable,
> +};
> +
> +static const struct udevice_id npcm8xx_regulator_ids[] = {
> + { .compatible = "regulator-npcm845" },
> + { },
> +};
> +
> +U_BOOT_DRIVER(regulator_npcm8xx) = {
> + .name = "regulator_npcm845",
> + .id = UCLASS_REGULATOR,
> + .ops = &npcm8xx_regulator_ops,
> + .of_match = npcm8xx_regulator_ids,
> +};
> --
> 2.17.1
