diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-mpc.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-mpc.c | 37 |
1 files changed, 24 insertions, 13 deletions
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c index 81ac92bb4f6f..cfd074ee6d54 100644 --- a/drivers/i2c/busses/i2c-mpc.c +++ b/drivers/i2c/busses/i2c-mpc.c @@ -770,7 +770,6 @@ static const struct i2c_algorithm mpc_algo = { static struct i2c_adapter mpc_ops = { .owner = THIS_MODULE, .algo = &mpc_algo, - .timeout = HZ, }; static struct i2c_bus_recovery_info fsl_i2c_recovery_info = { @@ -781,11 +780,9 @@ static int fsl_i2c_probe(struct platform_device *op) { const struct mpc_i2c_data *data; struct mpc_i2c *i2c; - const u32 *prop; - u32 clock = MPC_I2C_CLOCK_LEGACY; - int result = 0; - int plen; struct clk *clk; + int result; + u32 clock; int err; i2c = devm_kzalloc(&op->dev, sizeof(*i2c), GFP_KERNEL); @@ -831,10 +828,10 @@ static int fsl_i2c_probe(struct platform_device *op) if (of_property_read_bool(op->dev.of_node, "fsl,preserve-clocking")) { clock = MPC_I2C_CLOCK_PRESERVE; } else { - prop = of_get_property(op->dev.of_node, "clock-frequency", - &plen); - if (prop && plen == sizeof(u32)) - clock = *prop; + result = of_property_read_u32(op->dev.of_node, + "clock-frequency", &clock); + if (result) + clock = MPC_I2C_CLOCK_LEGACY; } data = device_get_match_data(&op->dev); @@ -842,16 +839,30 @@ static int fsl_i2c_probe(struct platform_device *op) data->setup(op->dev.of_node, i2c, clock); } else { /* Backwards compatibility */ - if (of_get_property(op->dev.of_node, "dfsrr", NULL)) + if (of_property_read_bool(op->dev.of_node, "dfsrr")) mpc_i2c_setup_8xxx(op->dev.of_node, i2c, clock); } - prop = of_get_property(op->dev.of_node, "fsl,timeout", &plen); - if (prop && plen == sizeof(u32)) { - mpc_ops.timeout = *prop * HZ / 1000000; + /* + * "fsl,timeout" has been marked as deprecated and, to maintain + * backward compatibility, we will only look for it if + * "i2c-scl-clk-low-timeout-us" is not present. + */ + result = of_property_read_u32(op->dev.of_node, + "i2c-scl-clk-low-timeout-us", + &mpc_ops.timeout); + if (result == -EINVAL) + result = of_property_read_u32(op->dev.of_node, + "fsl,timeout", &mpc_ops.timeout); + + if (!result) { + mpc_ops.timeout *= HZ / 1000000; if (mpc_ops.timeout < 5) mpc_ops.timeout = 5; + } else { + mpc_ops.timeout = HZ; } + dev_info(i2c->dev, "timeout %u us\n", mpc_ops.timeout * 1000000 / HZ); if (of_property_read_bool(op->dev.of_node, "fsl,i2c-erratum-a004447")) |