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i2c: muxes: pca954x: Add support for GPIO reset line

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This commit adds support for GPIO reset lines matching the
common linux "reset-gpios" devicetree binding.

Signed-off-by: Moritz Fischer <moritz.fischer@ettus.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Moritz Fischer 2017-09-12 06:46:59 -07:00 committed by Heiko Schocher
parent ba39608147
commit 36bdeb75a4
1 changed files with 39 additions and 1 deletions
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40
drivers/i2c/muxes/pca954x.c
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@ -1,5 +1,6 @@
/*
* Copyright (C) 2015 - 2016 Xilinx, Inc.
* Copyright (C) 2017 National Instruments Corp
* Written by Michal Simek
*
* SPDX-License-Identifier: GPL-2.0+
@ -9,7 +10,8 @@
#include <dm.h>
#include <errno.h>
#include <i2c.h>
#include <asm/gpio.h>
#include <asm-generic/gpio.h>
DECLARE_GLOBAL_DATA_PTR;
@ -30,6 +32,7 @@ struct chip_desc {
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[] = {
@ -105,10 +108,45 @@ static int pca954x_ofdata_to_platdata(struct udevice *dev)
return 0;
}
static int pca954x_probe(struct udevice *dev)
{
if (IS_ENABLED(CONFIG_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 (IS_ENABLED(CONFIG_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,
.ofdata_to_platdata = pca954x_ofdata_to_platdata,
.priv_auto_alloc_size = sizeof(struct pca954x_priv),