diff options
Diffstat (limited to 'drivers/misc/sl28cpld.c')
-rw-r--r-- | drivers/misc/sl28cpld.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/drivers/misc/sl28cpld.c b/drivers/misc/sl28cpld.c new file mode 100644 index 0000000000..01ef1c6178 --- /dev/null +++ b/drivers/misc/sl28cpld.c @@ -0,0 +1,105 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (c) 2021 Michael Walle <michael@walle.cc> + */ + +#include <common.h> +#include <dm.h> +#include <i2c.h> + +struct sl28cpld_child_plat { + uint offset; +}; + +/* + * The access methods works either with the first argument being a child + * device or with the MFD device itself. + */ +static int sl28cpld_read_child(struct udevice *dev, uint offset) +{ + struct sl28cpld_child_plat *plat = dev_get_parent_plat(dev); + struct udevice *mfd = dev_get_parent(dev); + + return dm_i2c_reg_read(mfd, offset + plat->offset); +} + +int sl28cpld_read(struct udevice *dev, uint offset) +{ + if (dev->driver == DM_DRIVER_GET(sl28cpld)) + return dm_i2c_reg_read(dev, offset); + else + return sl28cpld_read_child(dev, offset); +} + +static int sl28cpld_write_child(struct udevice *dev, uint offset, + uint8_t value) +{ + struct sl28cpld_child_plat *plat = dev_get_parent_plat(dev); + struct udevice *mfd = dev_get_parent(dev); + + return dm_i2c_reg_write(mfd, offset + plat->offset, value); +} + +int sl28cpld_write(struct udevice *dev, uint offset, uint8_t value) +{ + if (dev->driver == DM_DRIVER_GET(sl28cpld)) + return dm_i2c_reg_write(dev, offset, value); + else + return sl28cpld_write_child(dev, offset, value); +} + +int sl28cpld_update(struct udevice *dev, uint offset, uint8_t clear, + uint8_t set) +{ + int val; + + val = sl28cpld_read(dev, offset); + if (val < 0) + return val; + + val &= ~clear; + val |= set; + + return sl28cpld_write(dev, offset, val); +} + +static int sl28cpld_probe(struct udevice *dev) +{ + i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS | + DM_I2C_CHIP_WR_ADDRESS); + + return 0; +} + +static int sl28cpld_child_post_bind(struct udevice *dev) +{ + struct sl28cpld_child_plat *plat = dev_get_parent_plat(dev); + int offset; + + if (!dev_has_ofnode(dev)) + return 0; + + offset = dev_read_u32_default(dev, "reg", -1); + if (offset == -1) + return -EINVAL; + + plat->offset = offset; + + return 0; +} + +static const struct udevice_id sl28cpld_ids[] = { + { .compatible = "kontron,sl28cpld" }, + {} +}; + +U_BOOT_DRIVER(sl28cpld) = { + .name = "sl28cpld", + .id = UCLASS_NOP, + .of_match = sl28cpld_ids, + .probe = sl28cpld_probe, + .bind = dm_scan_fdt_dev, + .flags = DM_FLAG_PRE_RELOC, + .per_child_plat_auto = sizeof(struct sl28cpld_child_plat), + .child_post_bind = sl28cpld_child_post_bind, +}; |