diff --git a/MAINTAINERS b/MAINTAINERS index 419340093c9b..1d03b0060bda 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -29510,6 +29510,7 @@ M: James Hilliard L: linux-sunxi@lists.linux.dev S: Maintained F: Documentation/devicetree/bindings/mfd/x-powers,ac200.yaml +F: drivers/mfd/ac200.c X-POWERS AXP288 PMIC DRIVERS M: Hans de Goede diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig index 857ca3bb0d5b..071cba7c775b 100644 --- a/drivers/mfd/Kconfig +++ b/drivers/mfd/Kconfig @@ -205,6 +205,20 @@ config MFD_AC100 This driver include only the core APIs. You have to select individual components like codecs or RTC under the corresponding menus. +config MFD_AC200 + tristate "X-Powers AC200" + depends on COMMON_CLK + depends on I2C + depends on OF + select MFD_CORE + select REGMAP_I2C + help + Support for the X-Powers AC200 mixed-signal companion IC. The AC200 + contains audio, video, RTC and Fast Ethernet PHY functions and is + co-packaged with some Allwinner H6 and H616 SoCs. This driver provides + the shared register access and instantiates the individual function + devices. + config MFD_AXP20X tristate select MFD_CORE diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile index 72d3944b0ad8..f8101d2a9ce9 100644 --- a/drivers/mfd/Makefile +++ b/drivers/mfd/Makefile @@ -150,6 +150,7 @@ obj-$(CONFIG_MFD_DA9052_SPI) += da9052-spi.o obj-$(CONFIG_MFD_DA9052_I2C) += da9052-i2c.o obj-$(CONFIG_MFD_AC100) += ac100.o +obj-$(CONFIG_MFD_AC200) += ac200.o obj-$(CONFIG_MFD_AXP20X) += axp20x.o obj-$(CONFIG_MFD_AXP20X_I2C) += axp20x-i2c.o obj-$(CONFIG_MFD_AXP20X_RSB) += axp20x-rsb.o diff --git a/drivers/mfd/ac200.c b/drivers/mfd/ac200.c new file mode 100644 index 000000000000..af0d27ff5f45 --- /dev/null +++ b/drivers/mfd/ac200.c @@ -0,0 +1,231 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * MFD core driver for the X-Powers AC200 + * + * Copyright (C) 2019 Jernej Skrabec + * Copyright (C) 2026 James Hilliard + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#define AC200_SYS_CONTROL_REG 0x0002 +#define AC200_SYS_CONTROL_CHIP_RESET_DEASSERT BIT(0) +#define AC200_SYS_IRQ_ENABLE_REG 0x0004 +#define AC200_SYS_IRQ_INTB_ENABLE BIT(15) +#define AC200_SYS_IRQ_INTB_ACTIVE_HIGH BIT(14) +#define AC200_SYS_IRQ_RTC BIT(12) +#define AC200_SYS_IRQ_EPHY BIT(8) +#define AC200_SYS_IRQ_TVE BIT(4) + +/* Interface register accessible from every register page. */ +#define AC200_TWI_REG_ADDR_H 0x00fe +#define AC200_MAX_REG 0xa1f2 + +static const struct regmap_range_cfg ac200_range_cfg[] = { + { + .range_max = AC200_MAX_REG, + .selector_reg = AC200_TWI_REG_ADDR_H, + .selector_mask = 0xff, + .window_len = 256, + }, +}; + +/* + * Each AC200 sub-block can reset independently, invalidating its register + * contents without regmap's knowledge. Cache only the common page selector; + * this avoids a selector read-modify-write for every access on the same page + * without ever returning stale functional-register values. + */ +static bool ac200_volatile_reg(struct device *dev, unsigned int reg) +{ + return reg != AC200_TWI_REG_ADDR_H; +} + +static const struct regmap_config ac200_regmap_config = { + .name = "ac200", + .reg_bits = 8, + .reg_stride = 2, + .val_bits = 16, + .ranges = ac200_range_cfg, + .num_ranges = ARRAY_SIZE(ac200_range_cfg), + .max_register = AC200_MAX_REG, + .volatile_reg = ac200_volatile_reg, + .cache_type = REGCACHE_MAPLE, +}; + +static const char * const ac200_codec_supplies[] = { + "ac-ldoin", +}; + +static const char * const ac200_tve_supplies[] = { + "tv-vcc", +}; + +static const struct resource ac200_tve_resources[] = { + DEFINE_RES_IRQ_NAMED(0, "intb"), +}; + +#define AC200_CELL(_name, _supplies, _resources) \ + { \ + .name = (_name), \ + .parent_supplies = (_supplies), \ + .num_parent_supplies = ARRAY_SIZE(_supplies), \ + .resources = (_resources), \ + .num_resources = MFD_RES_SIZE(_resources), \ + } + +static const struct mfd_cell ac200_cells[] = { + AC200_CELL("ac200-codec", ac200_codec_supplies, NULL), + AC200_CELL("ac200-tve", ac200_tve_supplies, ac200_tve_resources), +}; + +static const struct mfd_cell ac200_noirq_cells[] = { + AC200_CELL("ac200-codec", ac200_codec_supplies, NULL), + AC200_CELL("ac200-tve", ac200_tve_supplies, NULL), +}; + +static void ac200_disable_intb(void *data) +{ + struct regmap *regmap = data; + int ret; + + ret = regmap_clear_bits(regmap, AC200_SYS_IRQ_ENABLE_REG, + AC200_SYS_IRQ_INTB_ENABLE); + if (ret) + dev_err(regmap_get_device(regmap), "failed to disable INTB: %d\n", + ret); +} + +static int ac200_init_irq(struct device *dev, struct regmap *regmap, int irq) +{ + unsigned int trigger; + u16 value = 0; + int ret; + + trigger = irq_get_trigger_type(irq); + switch (trigger) { + case IRQ_TYPE_LEVEL_HIGH: + value |= AC200_SYS_IRQ_INTB_ACTIVE_HIGH; + break; + case IRQ_TYPE_NONE: + case IRQ_TYPE_LEVEL_LOW: + break; + default: + return dev_err_probe(dev, -EINVAL, + "INTB is level triggered, not type %u\n", + trigger); + } + + /* Mask every source before enabling the shared output. */ + ret = regmap_update_bits(regmap, AC200_SYS_IRQ_ENABLE_REG, + AC200_SYS_IRQ_INTB_ENABLE | + AC200_SYS_IRQ_INTB_ACTIVE_HIGH | + AC200_SYS_IRQ_RTC | AC200_SYS_IRQ_EPHY | + AC200_SYS_IRQ_TVE, value); + if (ret) + return ret; + + /* Children are removed before INTB is disabled and the regmap released. */ + ret = devm_add_action_or_reset(dev, ac200_disable_intb, regmap); + if (ret) + return ret; + + if (trigger == IRQ_TYPE_NONE) { + ret = irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW); + if (ret) + return dev_err_probe(dev, ret, "failed to set INTB trigger\n"); + } + + /* + * Function drivers request INTB with IRQF_SHARED | IRQF_ONESHOT before + * enabling their own source. They check and clear their own status and + * mask their source before freeing the IRQ. No IRQ domain is needed. + */ + return regmap_set_bits(regmap, AC200_SYS_IRQ_ENABLE_REG, + AC200_SYS_IRQ_INTB_ENABLE); +} + +static int ac200_probe(struct i2c_client *client) +{ + const struct mfd_cell *cells = ac200_noirq_cells; + unsigned int num_cells = ARRAY_SIZE(ac200_noirq_cells); + struct device *dev = &client->dev; + struct regmap *regmap; + struct clk *clk; + int ret; + + clk = devm_clk_get_enabled(dev, NULL); + if (IS_ERR(clk)) + return dev_err_probe(dev, PTR_ERR(clk), + "failed to enable input clock\n"); + + ret = devm_clk_rate_exclusive_get(dev, clk); + if (ret) + return dev_err_probe(dev, ret, "failed to lock clock rate\n"); + + /* + * No minimum delay is documented. Retain the vendor resume path's 40 ms + * wait after enabling the input clock and before register access. + */ + msleep(40); + + regmap = devm_regmap_init_i2c(client, &ac200_regmap_config); + if (IS_ERR(regmap)) + return dev_err_probe(dev, PTR_ERR(regmap), + "failed to initialize regmap\n"); + + ret = regmap_set_bits(regmap, AC200_SYS_CONTROL_REG, + AC200_SYS_CONTROL_CHIP_RESET_DEASSERT); + if (ret) + return ret; + + if (client->irq > 0) { + ret = ac200_init_irq(dev, regmap, client->irq); + if (ret) + return ret; + cells = ac200_cells; + num_cells = ARRAY_SIZE(ac200_cells); + } + + /* Function drivers read their firmware properties from the parent. */ + ret = devm_mfd_add_devices(dev, PLATFORM_DEVID_AUTO, cells, num_cells, + NULL, client->irq, NULL); + if (ret) + return dev_err_probe(dev, ret, "failed to add function devices\n"); + + return 0; +} + +static const struct of_device_id ac200_of_match[] = { + { .compatible = "x-powers,ac200" }, + { } +}; +MODULE_DEVICE_TABLE(of, ac200_of_match); + +static const struct i2c_device_id ac200_i2c_ids[] = { + { .name = "ac200" }, + { } +}; +MODULE_DEVICE_TABLE(i2c, ac200_i2c_ids); + +static struct i2c_driver ac200_driver = { + .driver = { + .name = "ac200", + .of_match_table = ac200_of_match, + }, + .probe = ac200_probe, + .id_table = ac200_i2c_ids, +}; +module_i2c_driver(ac200_driver); + +MODULE_AUTHOR("Jernej Skrabec "); +MODULE_AUTHOR("James Hilliard "); +MODULE_DESCRIPTION("X-Powers AC200 MFD core driver"); +MODULE_LICENSE("GPL");