[U-Boot] [PATCH 4/4] i2c: muxes: Add support for TI PCA954X mux

[Heiko Schocher <hs@denx.de>]

Hello Michal,

Am 14.04.2016 um 14:15 schrieb Michal Simek:
> 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>
> ---
>
>   drivers/i2c/muxes/Kconfig   |  7 ++++
>   drivers/i2c/muxes/Makefile  |  1 +
>   drivers/i2c/muxes/pca954x.c | 79 +++++++++++++++++++++++++++++++++++++++++++++
>   3 files changed, 87 insertions(+)
>   create mode 100644 drivers/i2c/muxes/pca954x.c

Thanks for your work!

I added Simon to CC, as he is the DM expert ;-)

from my side, your patch looks fine, so:

Reviewed-by: Heiko Schocher <hs@denx.de>

bye,
Heiko
> diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig
> index f959d9de9e8b..e16b902f9611 100644
> --- a/drivers/i2c/muxes/Kconfig
> +++ b/drivers/i2c/muxes/Kconfig
> @@ -24,3 +24,10 @@ 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.
> diff --git a/drivers/i2c/muxes/Makefile b/drivers/i2c/muxes/Makefile
> index 47c1240d7e9e..fb2d67ec9a97 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 000000000000..206581d3d908
> --- /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 pca95xx_priv {
> +	u32 addr;
> +	u32 width;
> +};
> +
> +static int pca95xx_deselect(struct udevice *mux, struct udevice *bus,
> +			    uint channel)
> +{
> +	struct pca95xx_priv *priv = dev_get_priv(mux);
> +	uchar byte = 0;
> +
> +	return dm_i2c_write(mux, priv->addr, &byte, 1);
> +}
> +
> +static int pca95xx_select(struct udevice *mux, struct udevice *bus,
> +			  uint channel)
> +{
> +	struct pca95xx_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 pca95xx_ops = {
> +	.select = pca95xx_select,
> +	.deselect = pca95xx_deselect,
> +};
> +
> +static const struct udevice_id pca95xx_ids[] = {
> +	{ .compatible = "nxp,pca9548", .data = (ulong)8 },
> +	{ .compatible = "nxp,pca9544", .data = (ulong)4 },
> +	{ }
> +};
> +
> +static int pca95xx_ofdata_to_platdata(struct udevice *dev)
> +{
> +	struct pca95xx_priv *priv = dev_get_priv(dev);
> +
> +	priv->addr = dev_get_addr(dev);
> +	if (!priv->addr) {
> +		debug("MUX not found\n");
> +		return -ENOSYS;
> +	}
> +	priv->width = dev_get_driver_data(dev);
> +
> +	if (!priv->width) {
> +		debug("No I2C MUX width specified\n");
> +		return -ENOSYS;
> +	}
> +
> +	debug("Device %s at 0x%x with width %d\n",
> +	      dev->name, priv->addr, priv->width);
> +
> +	return 0;
> +}
> +
> +U_BOOT_DRIVER(pca95xx) = {
> +	.name = "pca95xx",
> +	.id = UCLASS_I2C_MUX,
> +	.of_match = pca95xx_ids,
> +	.ops = &pca95xx_ops,
> +	.ofdata_to_platdata = pca95xx_ofdata_to_platdata,
> +	.priv_auto_alloc_size = sizeof(struct pca95xx_priv),
> +};
>

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