diff options
author | Michal Simek <michal.simek@xilinx.com> | 2016-04-25 10:50:42 +0200 |
---|---|---|
committer | Heiko Schocher <hs@denx.de> | 2016-05-17 08:28:50 +0200 |
commit | d79ac324789839b4b10b37e2ff64dd9e4a92441e (patch) | |
tree | 901b815c4d8ccbc84c5b42f463e72a087414def1 /drivers | |
parent | ad72e7622bd587dc798fbac0351b558fb18caa97 (diff) |
i2c: muxes: Add support for TI PCA954X mux
Add support for common TI i2c mux which is available on ZynqMP zcu102
board.
DM i2c mux core code is selecting/deselecting bus before/after
every command is performed that's why only one channel is active at a
time. That's also the reason why deselect is just disable all available
channels.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/i2c/muxes/Kconfig | 10 | ||||
-rw-r--r-- | drivers/i2c/muxes/Makefile | 1 | ||||
-rw-r--r-- | drivers/i2c/muxes/pca954x.c | 79 |
3 files changed, 90 insertions, 0 deletions
diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig index f959d9de9e8..48900ed2afc 100644 --- a/drivers/i2c/muxes/Kconfig +++ b/drivers/i2c/muxes/Kconfig @@ -24,3 +24,13 @@ config I2C_ARB_GPIO_CHALLENGE I2C multimaster arbitration scheme using GPIOs and a challenge & response mechanism where masters have to claim the bus by asserting a GPIO. + +config I2C_MUX_PCA954x + tristate "TI PCA954x I2C Mux/switches" + depends on I2C_MUX + help + If you say yes here you get support for the TI PCA954x + I2C mux/switch devices. It is x width I2C multiplexer which enables to + paritioning I2C bus and connect multiple devices with the same address + to the same I2C controller where driver handles proper routing to + target i2c device. PCA9544 and PCA9548 are supported. diff --git a/drivers/i2c/muxes/Makefile b/drivers/i2c/muxes/Makefile index 47c1240d7e9..0811add4216 100644 --- a/drivers/i2c/muxes/Makefile +++ b/drivers/i2c/muxes/Makefile @@ -5,3 +5,4 @@ # obj-$(CONFIG_I2C_ARB_GPIO_CHALLENGE) += i2c-arb-gpio-challenge.o obj-$(CONFIG_$(SPL_)I2C_MUX) += i2c-mux-uclass.o +obj-$(CONFIG_I2C_MUX_PCA954x) += pca954x.o diff --git a/drivers/i2c/muxes/pca954x.c b/drivers/i2c/muxes/pca954x.c new file mode 100644 index 00000000000..7e0d2da4d60 --- /dev/null +++ b/drivers/i2c/muxes/pca954x.c @@ -0,0 +1,79 @@ +/* + * Copyright (C) 2015 - 2016 Xilinx, Inc. + * Written by Michal Simek + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <i2c.h> +#include <asm/gpio.h> + +DECLARE_GLOBAL_DATA_PTR; + +struct pca954x_priv { + u32 addr; /* I2C mux address */ + u32 width; /* I2C mux width - number of busses */ +}; + +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); + uchar 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,pca9548", .data = (ulong)8 }, + { .compatible = "nxp,pca9544", .data = (ulong)4 }, + { } +}; + +static int pca954x_ofdata_to_platdata(struct udevice *dev) +{ + struct pca954x_priv *priv = dev_get_priv(dev); + + priv->addr = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", 0); + if (!priv->addr) { + debug("MUX not found\n"); + return -ENODEV; + } + priv->width = dev_get_driver_data(dev); + + 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; +} + +U_BOOT_DRIVER(pca954x) = { + .name = "pca954x", + .id = UCLASS_I2C_MUX, + .of_match = pca954x_ids, + .ops = &pca954x_ops, + .ofdata_to_platdata = pca954x_ofdata_to_platdata, + .priv_auto_alloc_size = sizeof(struct pca954x_priv), +}; |