2 files changed, 10 insertions, 2 deletions

diff --git a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
index f46d928aa73d..a1ee681942cc 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
+++ b/Documentation/devicetree/bindings/i2c/i2c-mv64xxx.txt
@@ -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:
 
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;