mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-22 11:13:07 +00:00
f10643cf8a
At present ofnode is present in the device even if it is never used. With of-platdata this field is not used, so can be removed. In preparation for this, change the access to go through inline functions. Signed-off-by: Simon Glass <sjg@chromium.org>
109 lines
2.7 KiB
C
109 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2019
|
|
* Alex Marginean, NXP
|
|
*/
|
|
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <log.h>
|
|
#include <miiphy.h>
|
|
#include <i2c.h>
|
|
|
|
/*
|
|
* This driver is used for MDIO muxes driven by writing to a register of an I2C
|
|
* chip. The board it was developed for uses a mux controlled by on-board FPGA
|
|
* which in turn is accessed as a chip over I2C.
|
|
*/
|
|
|
|
struct mdio_mux_i2creg_priv {
|
|
struct udevice *chip;
|
|
int reg;
|
|
int mask;
|
|
};
|
|
|
|
static int mdio_mux_i2creg_select(struct udevice *mux, int cur, int sel)
|
|
{
|
|
struct mdio_mux_i2creg_priv *priv = dev_get_priv(mux);
|
|
u8 val, val_old;
|
|
|
|
/* if last selection didn't change we're good to go */
|
|
if (cur == sel)
|
|
return 0;
|
|
|
|
val_old = dm_i2c_reg_read(priv->chip, priv->reg);
|
|
val = (val_old & ~priv->mask) | (sel & priv->mask);
|
|
debug("%s: chip %s, reg %x, val %x => %x\n", __func__, priv->chip->name,
|
|
priv->reg, val_old, val);
|
|
dm_i2c_reg_write(priv->chip, priv->reg, val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct mdio_mux_ops mdio_mux_i2creg_ops = {
|
|
.select = mdio_mux_i2creg_select,
|
|
};
|
|
|
|
static int mdio_mux_i2creg_probe(struct udevice *dev)
|
|
{
|
|
struct mdio_mux_i2creg_priv *priv = dev_get_priv(dev);
|
|
ofnode chip_node, bus_node;
|
|
struct udevice *i2c_bus;
|
|
u32 reg_mask[2];
|
|
u32 chip_addr;
|
|
int err;
|
|
|
|
/* read the register addr/mask pair */
|
|
err = dev_read_u32_array(dev, "mux-reg-masks", reg_mask, 2);
|
|
if (err) {
|
|
debug("%s: error reading mux-reg-masks property\n", __func__);
|
|
return err;
|
|
}
|
|
|
|
/* parent should be an I2C chip, grandparent should be an I2C bus */
|
|
chip_node = ofnode_get_parent(dev_ofnode(dev));
|
|
bus_node = ofnode_get_parent(chip_node);
|
|
|
|
err = uclass_get_device_by_ofnode(UCLASS_I2C, bus_node, &i2c_bus);
|
|
if (err) {
|
|
debug("%s: can't find I2C bus for node %s\n", __func__,
|
|
ofnode_get_name(bus_node));
|
|
return err;
|
|
}
|
|
|
|
err = ofnode_read_u32(chip_node, "reg", &chip_addr);
|
|
if (err) {
|
|
debug("%s: can't read chip address in %s\n", __func__,
|
|
ofnode_get_name(chip_node));
|
|
return err;
|
|
}
|
|
|
|
err = i2c_get_chip(i2c_bus, (uint)chip_addr, 1, &priv->chip);
|
|
if (err) {
|
|
debug("%s: can't find i2c chip device for addr %x\n", __func__,
|
|
chip_addr);
|
|
return err;
|
|
}
|
|
|
|
priv->reg = (int)reg_mask[0];
|
|
priv->mask = (int)reg_mask[1];
|
|
|
|
debug("%s: chip %s, reg %x, mask %x\n", __func__, priv->chip->name,
|
|
priv->reg, priv->mask);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct udevice_id mdio_mux_i2creg_ids[] = {
|
|
{ .compatible = "mdio-mux-i2creg" },
|
|
{ }
|
|
};
|
|
|
|
U_BOOT_DRIVER(mdio_mux_i2creg) = {
|
|
.name = "mdio_mux_i2creg",
|
|
.id = UCLASS_MDIO_MUX,
|
|
.of_match = mdio_mux_i2creg_ids,
|
|
.probe = mdio_mux_i2creg_probe,
|
|
.ops = &mdio_mux_i2creg_ops,
|
|
.priv_auto = sizeof(struct mdio_mux_i2creg_priv),
|
|
};
|