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i2c: mv64xxx: Set bus frequency to 100kHz if clock-frequency is not provided 

This commit adds checking whether clock-frequency property acquisition
has succeeded. If not, the frequency is set to 100kHz by default.

The Device Tree binding documentation is updated accordingly.

Based on the intials patches from Zbigniew Bodek

Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Zbigniew Bodek <zbb@semihalf.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Gregory CLEMENT 2013-06-21 15:32:06 +02:00 committed by Wolfram Sang
parent 2f641a8bdb
commit 4c730a06c1
2 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
View File

@ -6,7 +6,11 @@ Required properties :
- reg : Offset and length of the register set for the device
- compatible : Should be "marvell,mv64xxx-i2c"
- interrupts : The interrupt number
- clock-frequency : Desired I2C bus clock frequency in Hz.
Optional properties :
- clock-frequency : Desired I2C bus clock frequency in Hz. If not set the
default frequency is 100kHz
Examples:

6
drivers/i2c/busses/i2c-mv64xxx.c
View File

@ -578,7 +578,11 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
goto out;
}
tclk = clk_get_rate(drv_data->clk);
of_property_read_u32(np, "clock-frequency", &bus_freq);
rc = of_property_read_u32(np, "clock-frequency", &bus_freq);
if (rc)
bus_freq = 100000; /* 100kHz by default */
if (!mv64xxx_find_baud_factors(bus_freq, tclk,
&drv_data->freq_n, &drv_data->freq_m)) {
rc = -EINVAL;