On 19.10.21 18:07, zhaojh329@xxxxxxxxx wrote:
This patch adds I2C_FUNC_NOSTART and I2C_M_REV_DIR_ADDR support for MediaTek MT7621/7628/7688. This is useful for some I2C slave chips, such as 'drivers/input/joystick/as5011.c'. Signed-off-by: Jianhui Zhao <zhaojh329@xxxxxxxxx> --- drivers/i2c/busses/i2c-mt7621.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-mt7621.c b/drivers/i2c/busses/i2c-mt7621.c index 45fe4a7fe0c0..3d2763d9c090 100644 --- a/drivers/i2c/busses/i2c-mt7621.c +++ b/drivers/i2c/busses/i2c-mt7621.c @@ -150,6 +150,9 @@ static int mtk_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, for (i = 0; i < num; i++) { pmsg = &msgs[i];+ if (pmsg->flags & I2C_M_NOSTART)+ goto nostart; + /* wait hardware idle */ ret = mtk_i2c_wait_idle(i2c); if (ret) @@ -174,6 +177,8 @@ static int mtk_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, } else { /* 7 bits address */ addr = i2c_8bit_addr_from_msg(pmsg); + if (pmsg->flags & I2C_M_REV_DIR_ADDR) + addr ^= 1; iowrite32(addr, i2c->base + REG_SM0D0_REG); ret = mtk_i2c_master_cmd(i2c, SM0CTL1_WRITE, 1); if (ret) @@ -187,6 +192,7 @@ static int mtk_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, goto err_ack; }+nostart:/* transfer data */ for (len = pmsg->len, j = 0; len > 0; len -= 8, j += 8) { page_len = (len >= 8) ? 8 : len; @@ -242,7 +248,8 @@ static int mtk_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,static u32 mtk_i2c_func(struct i2c_adapter *a){ - return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_PROTOCOL_MANGLING; + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR + | I2C_FUNC_PROTOCOL_MANGLING | I2C_FUNC_NOSTART;
Nit: I prefer to have the "|" at the end of the upper line instead of adding it in the 2nd line. Other that this: Reviewed-by: Stefan Roese <sr@xxxxxxx> Thanks, Stefan
