i2c: designware: fix i2c_dw_clk_rate() return size to be u32

Make i2c_dw_clk_rate() to return u32 instead of unsigned long, as the
function return the value of get_clk_rate_khz() which returns u32.

Fixes: b33af11de2 ("i2c: designware: Do not require clock when SSCN and FFCN are provided")
Signed-off-by: Hanna Hawa <hhhawa@amazon.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

drivers/i2c/busses/i2c-designware-common.c

@@ -462,7 +462,7 @@ void __i2c_dw_disable(struct dw_i2c_dev *dev)
 	dev_warn(dev->dev, "timeout in disabling adapter\n");
 }
 
-unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev)
+u32 i2c_dw_clk_rate(struct dw_i2c_dev *dev)
 {
 	/*
 	 * Clock is not necessary if we got LCNT/HCNT values directly from

drivers/i2c/busses/i2c-designware-core.h

@@ -320,7 +320,7 @@ int i2c_dw_init_regmap(struct dw_i2c_dev *dev);
 u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset);
 u32 i2c_dw_scl_lcnt(u32 ic_clk, u32 tLOW, u32 tf, int offset);
 int i2c_dw_set_sda_hold(struct dw_i2c_dev *dev);
-unsigned long i2c_dw_clk_rate(struct dw_i2c_dev *dev);
+u32 i2c_dw_clk_rate(struct dw_i2c_dev *dev);
 int i2c_dw_prepare_clk(struct dw_i2c_dev *dev, bool prepare);
 int i2c_dw_acquire_lock(struct dw_i2c_dev *dev);
 void i2c_dw_release_lock(struct dw_i2c_dev *dev);