summaryrefslogtreecommitdiff
path: root/drivers/i2c
diff options
context:
space:
mode:
authorMoritz Fischer <moritz.fischer@ettus.com>2017-09-12 06:46:59 -0700
committerHeiko Schocher <hs@denx.de>2017-09-13 05:35:48 +0200
commit36bdeb75a4f4f276c841644775e687eb6b3d9ec4 (patch)
treed7294073e0ae6d0519d65f8c643e0755d09cb6ef /drivers/i2c
parentba39608147c797cffb266579b5791649f0f8e60c (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.c40
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),