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i2c: apply DT flags when probing 

Check for slave and 10-bit flags when probing and mark the client when
found. Improve the address validity check, too

Tested-by: Andrey Danin <danindrey@mail.ru>
Acked-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2015-05-19 21:04:40 +02:00 committed by Wolfram Sang
parent c4019b7040
commit b4e2f6ac12
1 changed files with 18 additions and 5 deletions
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23
drivers/i2c/i2c-core.c
View File

@ -27,6 +27,7 @@
I2C slave support (c) 2014 by Wolfram Sang <wsa@sang-engineering.com>
*/
#include <dt-bindings/i2c/i2c.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/delay.h>
@ -1288,7 +1289,8 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
struct i2c_client *result;
struct i2c_board_info info = {};
struct dev_archdata dev_ad = {};
const __be32 *addr;
const __be32 *addr_be;
u32 addr;
int len;
dev_dbg(&adap->dev, "of_i2c: register %s\n", node->full_name);
@ -1299,20 +1301,31 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
return ERR_PTR(-EINVAL);
}
addr = of_get_property(node, "reg", &len);
if (!addr || (len < sizeof(*addr))) {
addr_be = of_get_property(node, "reg", &len);
if (!addr_be || (len < sizeof(*addr_be))) {
dev_err(&adap->dev, "of_i2c: invalid reg on %s\n",
node->full_name);
return ERR_PTR(-EINVAL);
}
info.addr = be32_to_cpup(addr);
if (info.addr > (1 << 10) - 1) {
addr = be32_to_cpup(addr_be);
if (addr & I2C_TEN_BIT_ADDRESS) {
addr &= ~I2C_TEN_BIT_ADDRESS;
info.flags |= I2C_CLIENT_TEN;
}
if (addr & I2C_OWN_SLAVE_ADDRESS) {
addr &= ~I2C_OWN_SLAVE_ADDRESS;
info.flags |= I2C_CLIENT_SLAVE;
}
if (i2c_check_addr_validity(addr, info.flags)) {
dev_err(&adap->dev, "of_i2c: invalid addr=%x on %s\n",
info.addr, node->full_name);
return ERR_PTR(-EINVAL);
}
info.addr = addr;
info.of_node = of_node_get(node);
info.archdata = &dev_ad;