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authorGregory CLEMENT <gregory.clement@free-electrons.com>2013-06-21 17:32:06 +0400
committerWolfram Sang <wsa@the-dreams.de>2013-06-26 01:43:37 +0400
commit4c730a06c19bb83d2fa4308ee4cbb23abc84c9ca (patch)
tree756a378f3e7ec8fae98aed6ab79631bb5bd914a9 /drivers/i2c/busses/i2c-mv64xxx.c
parent2f641a8bdb1b808b9bf1d0ca7d169d199aaf6ff4 (diff)
downloadlinux-4c730a06c19bb83d2fa4308ee4cbb23abc84c9ca.tar.xz
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>
Diffstat (limited to 'drivers/i2c/busses/i2c-mv64xxx.c')
-rw-r--r--drivers/i2c/busses/i2c-mv64xxx.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index ed854573b427..b1f42bf40963 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -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;