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mfd: stmpe: Probe properly from the Device Tree

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The current STMPE I2C probing code does not really match the
compatible strings - it matches node names happening to give
the right device name. Instead, let's introduce some real
compatible matching, more complex, more accurate. Make the
driver depend on OF since all platforms using it are DT-only.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Linus Walleij 2014-04-23 23:35:58 +02:00 committed by Lee Jones
parent b69d2ad674
commit 5a826feedc
2 changed files with 30 additions and 1 deletions
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1
drivers/mfd/Kconfig
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@ -675,6 +675,7 @@ config MFD_DB8500_PRCMU
config MFD_STMPE
bool "STMicroelectronics STMPE"
depends on (I2C=y || SPI_MASTER=y)
depends on OF
select MFD_CORE
help
Support for the STMPE family of I/O Expanders from

30
drivers/mfd/stmpe-i2c.c
View File

@ -14,6 +14,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/of_device.h>
#include "stmpe.h"
static int i2c_reg_read(struct stmpe *stmpe, u8 reg)
@ -52,15 +53,41 @@ static struct stmpe_client_info i2c_ci = {
.write_block = i2c_block_write,
};
static const struct of_device_id stmpe_of_match[] = {
{ .compatible = "st,stmpe610", .data = (void *)STMPE610, },
{ .compatible = "st,stmpe801", .data = (void *)STMPE801, },
{ .compatible = "st,stmpe811", .data = (void *)STMPE811, },
{ .compatible = "st,stmpe1601", .data = (void *)STMPE1601, },
{ .compatible = "st,stmpe1801", .data = (void *)STMPE1801, },
{ .compatible = "st,stmpe2401", .data = (void *)STMPE2401, },
{ .compatible = "st,stmpe2403", .data = (void *)STMPE2403, },
{},
};
MODULE_DEVICE_TABLE(of, stmpe_of_match);
static int
stmpe_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id)
{
int partnum;
const struct of_device_id *of_id;
i2c_ci.data = (void *)id;
i2c_ci.irq = i2c->irq;
i2c_ci.client = i2c;
i2c_ci.dev = &i2c->dev;
return stmpe_probe(&i2c_ci, id->driver_data);
of_id = of_match_device(stmpe_of_match, &i2c->dev);
if (!of_id) {
/*
* This happens when the I2C ID matches the node name
* but no real compatible string has been given.
*/
dev_info(&i2c->dev, "matching on node name, compatible is preferred\n");
partnum = id->driver_data;
} else
partnum = (int)of_id->data;
return stmpe_probe(&i2c_ci, partnum);
}
static int stmpe_i2c_remove(struct i2c_client *i2c)
@ -89,6 +116,7 @@ static struct i2c_driver stmpe_i2c_driver = {
#ifdef CONFIG_PM
.pm = &stmpe_dev_pm_ops,
#endif
.of_match_table = stmpe_of_match,
},
.probe = stmpe_i2c_probe,
.remove = stmpe_i2c_remove,