[PATCH] i2c: mv64xxx: continue probe when clock-frequency is missing

Antony Pavlov antonynpavlov at gmail.com
Thu Apr 16 12:00:45 PDT 2015

Based on this linux kernel commit:

    commit 0ce4bc1dbdd911ae1763e2d4ff36bd1b214a59f7
    Author: Chen-Yu Tsai <wens at csie.org>
    Date:   Mon Sep 1 22:28:13 2014 +0800

        i2c: mv64xxx: continue probe when clock-frequency is missing

        The "clock-frequency" DT property is listed as optional, However,
        the current code stores the return value of of_property_read_u32 in
        the return code of mv64xxx_of_config, but then forgets to clear it
        after setting the default value of "clock-frequency". It is then
        passed out to the main probe function, resulting in a probe failure
        when "clock-frequency" is missing.

Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
 drivers/i2c/busses/i2c-mv64xxx.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-mv64xxx.c b/drivers/i2c/busses/i2c-mv64xxx.c
index 6d8c85b..4fd3a6f 100644
--- a/drivers/i2c/busses/i2c-mv64xxx.c
+++ b/drivers/i2c/busses/i2c-mv64xxx.c
@@ -540,8 +540,7 @@ mv64xxx_of_config(struct mv64xxx_i2c_data *drv_data,
 	tclk = clk_get_rate(drv_data->clk);
-	rc = of_property_read_u32(np, "clock-frequency", &bus_freq);
-	if (rc)
+	if (of_property_read_u32(np, "clock-frequency", &bus_freq))
 		bus_freq = 100000; /* 100kHz by default */
 	if (!mv64xxx_find_baud_factors(bus_freq, tclk,

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