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authorGuenter Roeck <linux@roeck-us.net>2013-07-10 12:03:21 -0700
committerWolfram Sang <wsa@the-dreams.de>2013-08-07 17:30:04 +0200
commit421476aeed56a8d19c890ae6729e3c43b740da7a (patch)
tree0fd92df9b573fde8c930da6301a6eea0a79ac833 /drivers/i2c
parentc66c4cc087eb1f5307f6391e467797227aed758a (diff)
downloadop-kernel-dev-421476aeed56a8d19c890ae6729e3c43b740da7a.zip
op-kernel-dev-421476aeed56a8d19c890ae6729e3c43b740da7a.tar.gz
i2c: mpc: Define unique I2C adapter names
The I2C adapters on Freescale MPC107/824x/85xx/512x/52xx/83xx/86xx all have the same name "MPC adapter". Since I2C adapter numbers can change across reboots and even after loading/unloading an I2C bus master driver, adapter names have to be used to identify adapters and thus should be unique and well defined. Since this is not the case with this driver, it is difficult if not impossible to identify a specific adapter from user space on affected platforms. To remedy the problem, use the adapter memory address as part of the adapter name. With this patch, adapter names are: On P2020: MPC adapter at 0xfff703000 MPC adapter at 0xfff703100 On P5040: MPC adapter at 0xffe118000 MPC adapter at 0xffe118100 MPC adapter at 0xffe119000 MPC adapter at 0xffe119100 Signed-off-by: Guenter Roeck <linux@roeck-us.net> Acked-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-mpc.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index 7607dc0..99acf63 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -609,7 +609,6 @@ static const struct i2c_algorithm mpc_algo = {
static struct i2c_adapter mpc_ops = {
.owner = THIS_MODULE,
- .name = "MPC adapter",
.algo = &mpc_algo,
.timeout = HZ,
};
@@ -623,6 +622,7 @@ static int fsl_i2c_probe(struct platform_device *op)
u32 clock = MPC_I2C_CLOCK_LEGACY;
int result = 0;
int plen;
+ struct resource res;
match = of_match_device(mpc_i2c_of_match, &op->dev);
if (!match)
@@ -682,6 +682,9 @@ static int fsl_i2c_probe(struct platform_device *op)
platform_set_drvdata(op, i2c);
i2c->adap = mpc_ops;
+ of_address_to_resource(op->dev.of_node, 0, &res);
+ scnprintf(i2c->adap.name, sizeof(i2c->adap.name),
+ "MPC adapter at 0x%llx", (unsigned long long)res.start);
i2c_set_adapdata(&i2c->adap, i2c);
i2c->adap.dev.parent = &op->dev;
i2c->adap.dev.of_node = of_node_get(op->dev.of_node);
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