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u-boot/drivers/i2c/muxes/pca954x.c
Vladimir Oltean 3285a5715f i2c: muxes: pca954x: add PCA9847 variant
This seems to be very similar to the already existing PCA9547, save for
the fact that it supports 0.8V and doesn't support 5V. In fact, it is so
similar to the PCA9547 that the NXP LS1028A-RDB board has been driving
this chip using a "nxp,pca9547" compatible string.

Create a new compatible for the PCA9847 (which is the same as in Linux)
and define the same operating parameters for it as for PCA9547.

Cc: Heiko Schocher <hs@denx.de>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
Reviewed-by: Michael Walle <michael@walle.cc>
2022-02-01 15:08:07 +05:30

184 lines
3.8 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2015 - 2016 Xilinx, Inc.
* Copyright (C) 2017 National Instruments Corp
* Written by Michal Simek
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <i2c.h>
#include <log.h>
#include <malloc.h>
#include <asm/global_data.h>
#include <asm-generic/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
enum pca_type {
PCA9543,
PCA9544,
PCA9546,
PCA9547,
PCA9548,
PCA9646,
PCA9847,
};
struct chip_desc {
u8 enable; /* Enable mask in ctl register (used for muxes only) */
enum muxtype {
pca954x_ismux = 0,
pca954x_isswi,
} muxtype;
u32 width;
};
struct pca954x_priv {
u32 addr; /* I2C mux address */
u32 width; /* I2C mux width - number of busses */
struct gpio_desc gpio_mux_reset;
};
static const struct chip_desc chips[] = {
[PCA9543] = {
.muxtype = pca954x_isswi,
.width = 2,
},
[PCA9544] = {
.enable = 0x4,
.muxtype = pca954x_ismux,
.width = 4,
},
[PCA9546] = {
.muxtype = pca954x_isswi,
.width = 4,
},
[PCA9547] = {
.enable = 0x8,
.muxtype = pca954x_ismux,
.width = 8,
},
[PCA9548] = {
.muxtype = pca954x_isswi,
.width = 8,
},
[PCA9646] = {
.muxtype = pca954x_isswi,
.width = 4,
},
[PCA9847] = {
.enable = 0x8,
.muxtype = pca954x_ismux,
.width = 8,
},
};
static int pca954x_deselect(struct udevice *mux, struct udevice *bus,
uint channel)
{
struct pca954x_priv *priv = dev_get_priv(mux);
uchar byte = 0;
return dm_i2c_write(mux, priv->addr, &byte, 1);
}
static int pca954x_select(struct udevice *mux, struct udevice *bus,
uint channel)
{
struct pca954x_priv *priv = dev_get_priv(mux);
const struct chip_desc *chip = &chips[dev_get_driver_data(mux)];
uchar byte;
if (chip->muxtype == pca954x_ismux)
byte = channel | chip->enable;
else
byte = 1 << channel;
return dm_i2c_write(mux, priv->addr, &byte, 1);
}
static const struct i2c_mux_ops pca954x_ops = {
.select = pca954x_select,
.deselect = pca954x_deselect,
};
static const struct udevice_id pca954x_ids[] = {
{ .compatible = "nxp,pca9543", .data = PCA9543 },
{ .compatible = "nxp,pca9544", .data = PCA9544 },
{ .compatible = "nxp,pca9546", .data = PCA9546 },
{ .compatible = "nxp,pca9547", .data = PCA9547 },
{ .compatible = "nxp,pca9548", .data = PCA9548 },
{ .compatible = "nxp,pca9646", .data = PCA9646 },
{ .compatible = "nxp,pca9847", .data = PCA9847 },
{ }
};
static int pca954x_of_to_plat(struct udevice *dev)
{
struct pca954x_priv *priv = dev_get_priv(dev);
const struct chip_desc *chip = &chips[dev_get_driver_data(dev)];
priv->addr = dev_read_u32_default(dev, "reg", 0);
if (!priv->addr) {
debug("MUX not found\n");
return -ENODEV;
}
priv->width = chip->width;
if (!priv->width) {
debug("No I2C MUX width specified\n");
return -EINVAL;
}
debug("Device %s at 0x%x with width %d\n",
dev->name, priv->addr, priv->width);
return 0;
}
static int pca954x_probe(struct udevice *dev)
{
if (CONFIG_IS_ENABLED(DM_GPIO)) {
struct pca954x_priv *priv = dev_get_priv(dev);
int err;
err = gpio_request_by_name(dev, "reset-gpios", 0,
&priv->gpio_mux_reset, GPIOD_IS_OUT);
/* it's optional so only bail if we get a real error */
if (err && (err != -ENOENT))
return err;
/* dm will take care of polarity */
if (dm_gpio_is_valid(&priv->gpio_mux_reset))
dm_gpio_set_value(&priv->gpio_mux_reset, 0);
}
return 0;
}
static int pca954x_remove(struct udevice *dev)
{
if (CONFIG_IS_ENABLED(DM_GPIO)) {
struct pca954x_priv *priv = dev_get_priv(dev);
if (dm_gpio_is_valid(&priv->gpio_mux_reset))
dm_gpio_free(dev, &priv->gpio_mux_reset);
}
return 0;
}
U_BOOT_DRIVER(pca954x) = {
.name = "pca954x",
.id = UCLASS_I2C_MUX,
.of_match = pca954x_ids,
.probe = pca954x_probe,
.remove = pca954x_remove,
.ops = &pca954x_ops,
.of_to_plat = pca954x_of_to_plat,
.priv_auto = sizeof(struct pca954x_priv),
};