diff options
| author | Moritz Fischer <moritz.fischer@ettus.com> | 2017-09-12 06:46:59 -0700 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2017-09-13 05:35:48 +0200 |
| commit | 36bdeb75a4f4f276c841644775e687eb6b3d9ec4 (patch) | |
| tree | d7294073e0ae6d0519d65f8c643e0755d09cb6ef /drivers/i2c | |
| parent | ba39608147c797cffb266579b5791649f0f8e60c (diff) | |
i2c: muxes: pca954x: Add support for GPIO reset line
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>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/muxes/pca954x.c | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/drivers/i2c/muxes/pca954x.c b/drivers/i2c/muxes/pca954x.c index 383f72f5522..01ca1ff48db 100644 --- a/drivers/i2c/muxes/pca954x.c +++ b/drivers/i2c/muxes/pca954x.c @@ -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), |