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Commit b395ba21 authored by Wolfram Sang's avatar Wolfram Sang Committed by Wolfram Sang
Browse files

i2c: rcar: document HW incapabilities 



Add recent findings (IGNORE_NAK) and document in a bit more detail why
the feature is not possible.

Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent f6462216

drivers/i2c/busses/i2c-rcar.c

+6 −1
Original line number Diff line number Diff line
@@ -783,7 +783,12 @@ static int rcar_unreg_slave(struct i2c_client *slave) 


static u32 rcar_i2c_func(struct i2c_adapter *adap)

{

	/* This HW can't do SMBUS_QUICK and NOSTART */

	/*

	 * This HW can't do:

	 * I2C_SMBUS_QUICK (setting FSB during START didn't work)

	 * I2C_M_NOSTART (automatically sends address after START)

	 * I2C_M_IGNORE_NAK (automatically sends STOP after NAK)

	 */

	return I2C_FUNC_I2C | I2C_FUNC_SLAVE |

		(I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);

}