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Commit c05d4902 authored by Jean Delvare's avatar Jean Delvare
Browse files

i2c-tiny-usb: Fix a comment on bus frequency 



The description of the delay parameter is incomplete, it suggests that
there is a direct relation between the delay value and the bus
frequency. In fact, due to additional delays in the i2c bitbanging
code, the i2c clock is always much slower.

Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Cc: Till Harbaum <Till@Harbaum.org>
parent 39376434

drivers/i2c/busses/i2c-tiny-usb.c

+5 −3
Original line number Diff line number Diff line
@@ -31,11 +31,13 @@ 
#define CMD_I2C_IO_BEGIN	(1<<0)

#define CMD_I2C_IO_END		(1<<1)



/* i2c bit delay, default is 10us -> 100kHz */

/* i2c bit delay, default is 10us -> 100kHz max

   (in practice, due to additional delays in the i2c bitbanging

   code this results in a i2c clock of about 50kHz) */

static unsigned short delay = 10;

module_param(delay, ushort, 0);

MODULE_PARM_DESC(delay, "bit delay in microseconds, "

		 "e.g. 10 for 100kHz (default is 100kHz)");

MODULE_PARM_DESC(delay, "bit delay in microseconds "

		 "(default is 10us for 100kHz max)");



static int usb_read(struct i2c_adapter *adapter, int cmd,

		    int value, int index, void *data, int len);