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https://github.com/smaeul/u-boot.git
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42595eb706
Add a multi-function device driver which will probe its children and provides methods to access the device. Signed-off-by: Michael Walle <michael@walle.cc> [Rebased] Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
106 lines
2.2 KiB
C
106 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2021 Michael Walle <michael@walle.cc>
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*/
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#include <common.h>
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#include <dm.h>
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#include <i2c.h>
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struct sl28cpld_child_plat {
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uint offset;
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};
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/*
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* The access methods works either with the first argument being a child
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* device or with the MFD device itself.
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*/
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static int sl28cpld_read_child(struct udevice *dev, uint offset)
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{
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struct sl28cpld_child_plat *plat = dev_get_parent_plat(dev);
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struct udevice *mfd = dev_get_parent(dev);
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return dm_i2c_reg_read(mfd, offset + plat->offset);
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}
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int sl28cpld_read(struct udevice *dev, uint offset)
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{
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if (dev->driver == DM_DRIVER_GET(sl28cpld))
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return dm_i2c_reg_read(dev, offset);
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else
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return sl28cpld_read_child(dev, offset);
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}
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static int sl28cpld_write_child(struct udevice *dev, uint offset,
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uint8_t value)
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{
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struct sl28cpld_child_plat *plat = dev_get_parent_plat(dev);
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struct udevice *mfd = dev_get_parent(dev);
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return dm_i2c_reg_write(mfd, offset + plat->offset, value);
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}
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int sl28cpld_write(struct udevice *dev, uint offset, uint8_t value)
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{
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if (dev->driver == DM_DRIVER_GET(sl28cpld))
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return dm_i2c_reg_write(dev, offset, value);
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else
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return sl28cpld_write_child(dev, offset, value);
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}
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int sl28cpld_update(struct udevice *dev, uint offset, uint8_t clear,
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uint8_t set)
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{
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int val;
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val = sl28cpld_read(dev, offset);
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if (val < 0)
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return val;
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val &= ~clear;
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val |= set;
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return sl28cpld_write(dev, offset, val);
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}
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static int sl28cpld_probe(struct udevice *dev)
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{
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i2c_set_chip_flags(dev, DM_I2C_CHIP_RD_ADDRESS |
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DM_I2C_CHIP_WR_ADDRESS);
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return 0;
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}
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static int sl28cpld_child_post_bind(struct udevice *dev)
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{
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struct sl28cpld_child_plat *plat = dev_get_parent_plat(dev);
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int offset;
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if (!dev_has_ofnode(dev))
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return 0;
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offset = dev_read_u32_default(dev, "reg", -1);
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if (offset == -1)
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return -EINVAL;
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plat->offset = offset;
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return 0;
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}
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static const struct udevice_id sl28cpld_ids[] = {
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{ .compatible = "kontron,sl28cpld" },
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{}
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};
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U_BOOT_DRIVER(sl28cpld) = {
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.name = "sl28cpld",
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.id = UCLASS_NOP,
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.of_match = sl28cpld_ids,
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.probe = sl28cpld_probe,
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.bind = dm_scan_fdt_dev,
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.flags = DM_FLAG_PRE_RELOC,
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.per_child_plat_auto = sizeof(struct sl28cpld_child_plat),
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.child_post_bind = sl28cpld_child_post_bind,
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};
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