From: "zhaojh329@gmail.com" <zhaojh329@gmail.com>
To: sr <sr@denx.de>
Cc: matthias.bgg <matthias.bgg@gmail.com>,
linux-i2c <linux-i2c@vger.kernel.org>,
linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
linux-mediatek <linux-mediatek@lists.infradead.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: [PATCH v2] i2c: mt76xx: add I2C_FUNC_NOSTART and I2C_M_REV_DIR_ADDR
Date: Mon, 25 Oct 2021 22:15:44 +0800 [thread overview]
Message-ID: <202110252215432797064@gmail.com> (raw)
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@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>
---
Changes v1 -> v2:
- Fix code style
---
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..a7acab78ef9d 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;
}
static const struct i2c_algorithm mtk_i2c_algo = {
--
2.25.1
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reply other threads:[~2021-10-25 14:17 UTC|newest]
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