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-rw-r--r--drivers/i2c/muxes/Kconfig1
-rw-r--r--drivers/i2c/muxes/i2c-mux-pinctrl.c219
-rw-r--r--include/linux/i2c-mux-pinctrl.h41
3 files changed, 72 insertions, 189 deletions
diff --git a/drivers/i2c/muxes/Kconfig b/drivers/i2c/muxes/Kconfig
index 2c64d0e0740f..1bba95ecc7c0 100644
--- a/drivers/i2c/muxes/Kconfig
+++ b/drivers/i2c/muxes/Kconfig
@@ -76,6 +76,7 @@ config I2C_MUX_PCA954x
config I2C_MUX_PINCTRL
tristate "pinctrl-based I2C multiplexer"
depends on PINCTRL
+ depends on OF || COMPILE_TEST
help
If you say yes to this option, support will be included for an I2C
multiplexer that uses the pinctrl subsystem, i.e. pin multiplexing.
diff --git a/drivers/i2c/muxes/i2c-mux-pinctrl.c b/drivers/i2c/muxes/i2c-mux-pinctrl.c
index 7c0c264b07bc..aa4a3bf9507f 100644
--- a/drivers/i2c/muxes/i2c-mux-pinctrl.c
+++ b/drivers/i2c/muxes/i2c-mux-pinctrl.c
@@ -20,14 +20,12 @@
#include <linux/i2c-mux.h>
#include <linux/module.h>
#include <linux/pinctrl/consumer.h>
-#include <linux/i2c-mux-pinctrl.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/of.h>
#include "../../pinctrl/core.h"
struct i2c_mux_pinctrl {
- struct i2c_mux_pinctrl_platform_data *pdata;
struct pinctrl *pinctrl;
struct pinctrl_state **states;
struct pinctrl_state *state_idle;
@@ -47,80 +45,6 @@ static int i2c_mux_pinctrl_deselect(struct i2c_mux_core *muxc, u32 chan)
return pinctrl_select_state(mux->pinctrl, mux->state_idle);
}
-#ifdef CONFIG_OF
-static int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux,
- struct platform_device *pdev)
-{
- struct device_node *np = pdev->dev.of_node;
- int num_names, i, ret;
- struct device_node *adapter_np;
- struct i2c_adapter *adapter;
-
- if (!np)
- return 0;
-
- mux->pdata = devm_kzalloc(&pdev->dev, sizeof(*mux->pdata), GFP_KERNEL);
- if (!mux->pdata)
- return -ENOMEM;
-
- num_names = of_property_count_strings(np, "pinctrl-names");
- if (num_names < 0) {
- dev_err(&pdev->dev, "Cannot parse pinctrl-names: %d\n",
- num_names);
- return num_names;
- }
-
- mux->pdata->pinctrl_states = devm_kzalloc(&pdev->dev,
- sizeof(*mux->pdata->pinctrl_states) * num_names,
- GFP_KERNEL);
- if (!mux->pdata->pinctrl_states)
- return -ENOMEM;
-
- for (i = 0; i < num_names; i++) {
- ret = of_property_read_string_index(np, "pinctrl-names", i,
- &mux->pdata->pinctrl_states[mux->pdata->bus_count]);
- if (ret < 0) {
- dev_err(&pdev->dev, "Cannot parse pinctrl-names: %d\n",
- ret);
- return ret;
- }
- if (!strcmp(mux->pdata->pinctrl_states[mux->pdata->bus_count],
- "idle")) {
- if (i != num_names - 1) {
- dev_err(&pdev->dev,
- "idle state must be last\n");
- return -EINVAL;
- }
- mux->pdata->pinctrl_state_idle = "idle";
- } else {
- mux->pdata->bus_count++;
- }
- }
-
- adapter_np = of_parse_phandle(np, "i2c-parent", 0);
- if (!adapter_np) {
- dev_err(&pdev->dev, "Cannot parse i2c-parent\n");
- return -ENODEV;
- }
- adapter = of_find_i2c_adapter_by_node(adapter_np);
- of_node_put(adapter_np);
- if (!adapter) {
- dev_err(&pdev->dev, "Cannot find parent bus\n");
- return -EPROBE_DEFER;
- }
- mux->pdata->parent_bus_num = i2c_adapter_id(adapter);
- put_device(&adapter->dev);
-
- return 0;
-}
-#else
-static inline int i2c_mux_pinctrl_parse_dt(struct i2c_mux_pinctrl *mux,
- struct platform_device *pdev)
-{
- return 0;
-}
-#endif
-
static struct i2c_adapter *i2c_mux_pinctrl_root_adapter(
struct pinctrl_state *state)
{
@@ -141,110 +65,109 @@ static struct i2c_adapter *i2c_mux_pinctrl_root_adapter(
return root;
}
+static struct i2c_adapter *i2c_mux_pinctrl_parent_adapter(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct device_node *parent_np;
+ struct i2c_adapter *parent;
+
+ parent_np = of_parse_phandle(np, "i2c-parent", 0);
+ if (!parent_np) {
+ dev_err(dev, "Cannot parse i2c-parent\n");
+ return ERR_PTR(-ENODEV);
+ }
+ parent = of_find_i2c_adapter_by_node(parent_np);
+ of_node_put(parent_np);
+ if (!parent)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ return parent;
+}
+
static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
struct i2c_mux_core *muxc;
struct i2c_mux_pinctrl *mux;
+ struct i2c_adapter *parent;
struct i2c_adapter *root;
- int i, ret;
-
- mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL);
- if (!mux) {
- ret = -ENOMEM;
- goto err;
- }
+ int num_names, i, ret;
+ const char *name;
- mux->pdata = dev_get_platdata(&pdev->dev);
- if (!mux->pdata) {
- ret = i2c_mux_pinctrl_parse_dt(mux, pdev);
- if (ret < 0)
- goto err;
- }
- if (!mux->pdata) {
- dev_err(&pdev->dev, "Missing platform data\n");
- ret = -ENODEV;
- goto err;
+ num_names = of_property_count_strings(np, "pinctrl-names");
+ if (num_names < 0) {
+ dev_err(dev, "Cannot parse pinctrl-names: %d\n",
+ num_names);
+ return num_names;
}
- mux->states = devm_kzalloc(&pdev->dev,
- sizeof(*mux->states) * mux->pdata->bus_count,
- GFP_KERNEL);
- if (!mux->states) {
- dev_err(&pdev->dev, "Cannot allocate states\n");
- ret = -ENOMEM;
- goto err;
- }
+ parent = i2c_mux_pinctrl_parent_adapter(dev);
+ if (IS_ERR(parent))
+ return PTR_ERR(parent);
- muxc = i2c_mux_alloc(NULL, &pdev->dev, mux->pdata->bus_count, 0, 0,
- i2c_mux_pinctrl_select, NULL);
+ muxc = i2c_mux_alloc(parent, dev, num_names,
+ sizeof(*mux) + num_names * sizeof(*mux->states),
+ 0, i2c_mux_pinctrl_select, NULL);
if (!muxc) {
ret = -ENOMEM;
- goto err;
+ goto err_put_parent;
}
- muxc->priv = mux;
+ mux = i2c_mux_priv(muxc);
+ mux->states = (struct pinctrl_state **)(mux + 1);
platform_set_drvdata(pdev, muxc);
- mux->pinctrl = devm_pinctrl_get(&pdev->dev);
+ mux->pinctrl = devm_pinctrl_get(dev);
if (IS_ERR(mux->pinctrl)) {
ret = PTR_ERR(mux->pinctrl);
- dev_err(&pdev->dev, "Cannot get pinctrl: %d\n", ret);
- goto err;
+ dev_err(dev, "Cannot get pinctrl: %d\n", ret);
+ goto err_put_parent;
}
- for (i = 0; i < mux->pdata->bus_count; i++) {
- mux->states[i] = pinctrl_lookup_state(mux->pinctrl,
- mux->pdata->pinctrl_states[i]);
+
+ for (i = 0; i < num_names; i++) {
+ ret = of_property_read_string_index(np, "pinctrl-names", i,
+ &name);
+ if (ret < 0) {
+ dev_err(dev, "Cannot parse pinctrl-names: %d\n", ret);
+ goto err_put_parent;
+ }
+
+ mux->states[i] = pinctrl_lookup_state(mux->pinctrl, name);
if (IS_ERR(mux->states[i])) {
ret = PTR_ERR(mux->states[i]);
- dev_err(&pdev->dev,
- "Cannot look up pinctrl state %s: %d\n",
- mux->pdata->pinctrl_states[i], ret);
- goto err;
- }
- }
- if (mux->pdata->pinctrl_state_idle) {
- mux->state_idle = pinctrl_lookup_state(mux->pinctrl,
- mux->pdata->pinctrl_state_idle);
- if (IS_ERR(mux->state_idle)) {
- ret = PTR_ERR(mux->state_idle);
- dev_err(&pdev->dev,
- "Cannot look up pinctrl state %s: %d\n",
- mux->pdata->pinctrl_state_idle, ret);
- goto err;
+ dev_err(dev, "Cannot look up pinctrl state %s: %d\n",
+ name, ret);
+ goto err_put_parent;
}
- muxc->deselect = i2c_mux_pinctrl_deselect;
- }
+ if (strcmp(name, "idle"))
+ continue;
- muxc->parent = i2c_get_adapter(mux->pdata->parent_bus_num);
- if (!muxc->parent) {
- dev_err(&pdev->dev, "Parent adapter (%d) not found\n",
- mux->pdata->parent_bus_num);
- ret = -EPROBE_DEFER;
- goto err;
+ if (i != num_names - 1) {
+ dev_err(dev, "idle state must be last\n");
+ ret = -EINVAL;
+ goto err_put_parent;
+ }
+ mux->state_idle = mux->states[i];
+ muxc->deselect = i2c_mux_pinctrl_deselect;
}
root = i2c_root_adapter(&muxc->parent->dev);
muxc->mux_locked = true;
- for (i = 0; i < mux->pdata->bus_count; i++) {
+ for (i = 0; i < num_names; i++) {
if (root != i2c_mux_pinctrl_root_adapter(mux->states[i])) {
muxc->mux_locked = false;
break;
}
}
- if (muxc->mux_locked && mux->pdata->pinctrl_state_idle &&
- root != i2c_mux_pinctrl_root_adapter(mux->state_idle))
- muxc->mux_locked = false;
-
if (muxc->mux_locked)
- dev_info(&pdev->dev, "mux-locked i2c mux\n");
+ dev_info(dev, "mux-locked i2c mux\n");
- for (i = 0; i < mux->pdata->bus_count; i++) {
- u32 bus = mux->pdata->base_bus_num ?
- (mux->pdata->base_bus_num + i) : 0;
-
- ret = i2c_mux_add_adapter(muxc, bus, i, 0);
+ /* Do not add any adapter for the idle state (if it's there at all). */
+ for (i = 0; i < num_names - !!mux->state_idle; i++) {
+ ret = i2c_mux_add_adapter(muxc, 0, i, 0);
if (ret)
goto err_del_adapter;
}
@@ -253,8 +176,9 @@ static int i2c_mux_pinctrl_probe(struct platform_device *pdev)
err_del_adapter:
i2c_mux_del_adapters(muxc);
+err_put_parent:
i2c_put_adapter(muxc->parent);
-err:
+
return ret;
}
@@ -264,16 +188,15 @@ static int i2c_mux_pinctrl_remove(struct platform_device *pdev)
i2c_mux_del_adapters(muxc);
i2c_put_adapter(muxc->parent);
+
return 0;
}
-#ifdef CONFIG_OF
static const struct of_device_id i2c_mux_pinctrl_of_match[] = {
{ .compatible = "i2c-mux-pinctrl", },
{},
};
MODULE_DEVICE_TABLE(of, i2c_mux_pinctrl_of_match);
-#endif
static struct platform_driver i2c_mux_pinctrl_driver = {
.driver = {
diff --git a/include/linux/i2c-mux-pinctrl.h b/include/linux/i2c-mux-pinctrl.h
deleted file mode 100644
index a65c86429e84..000000000000
--- a/include/linux/i2c-mux-pinctrl.h
+++ /dev/null
@@ -1,41 +0,0 @@
-/*
- * i2c-mux-pinctrl platform data
- *
- * Copyright (c) 2012, NVIDIA CORPORATION. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-
-#ifndef _LINUX_I2C_MUX_PINCTRL_H
-#define _LINUX_I2C_MUX_PINCTRL_H
-
-/**
- * struct i2c_mux_pinctrl_platform_data - Platform data for i2c-mux-pinctrl
- * @parent_bus_num: Parent I2C bus number
- * @base_bus_num: Base I2C bus number for the child busses. 0 for dynamic.
- * @bus_count: Number of child busses. Also the number of elements in
- * @pinctrl_states
- * @pinctrl_states: The names of the pinctrl state to select for each child bus
- * @pinctrl_state_idle: The pinctrl state to select when no child bus is being
- * accessed. If NULL, the most recently used pinctrl state will be left
- * selected.
- */
-struct i2c_mux_pinctrl_platform_data {
- int parent_bus_num;
- int base_bus_num;
- int bus_count;
- const char **pinctrl_states;
- const char *pinctrl_state_idle;
-};
-
-#endif
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