linux-kernel - [PATCH V2 7/7] i2c: sprd: Add I2C_NACK_EN and I2C_TRANS

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Date:   Mon, 23 Oct 2023 16:11:58 +0800
From:   Huangzheng Lai <Huangzheng.Lai@...soc.com>
To:     Andi Shyti <andi.shyti@...nel.org>
CC:     Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...ux.alibaba.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        <linux-i2c@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        huangzheng lai <laihuangzheng@...il.com>,
        Huangzheng Lai <Huangzheng.Lai@...soc.com>,
        Xiongpeng Wu <xiongpeng.wu@...soc.com>
Subject: [PATCH V2 7/7] i2c: sprd: Add I2C_NACK_EN and I2C_TRANS_EN control bits

The new I2C IP version on the UNISOC platform has added I2C_NACK_EN and
I2C_TRANS_EN control bits. To ensure that the I2C controller can initiate
transmission smoothly, these two bits need to be configured.

Signed-off-by: Huangzheng Lai <Huangzheng.Lai@...soc.com>
---
 drivers/i2c/busses/i2c-sprd.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
index dbdac89ad482..431c0db84d22 100644
--- a/drivers/i2c/busses/i2c-sprd.c
+++ b/drivers/i2c/busses/i2c-sprd.c
@@ -33,6 +33,8 @@
 #define ADDR_RST		0x2c
 
 /* I2C_CTL */
+#define I2C_NACK_EN		BIT(22)
+#define I2C_TRANS_EN		BIT(21)
 #define STP_EN			BIT(20)
 #define FIFO_AF_LVL_MASK	GENMASK(19, 16)
 #define FIFO_AF_LVL		16
@@ -366,7 +368,7 @@ static void sprd_i2c_enable(struct sprd_i2c *i2c_dev)
 	sprd_i2c_clear_irq(i2c_dev);
 
 	tmp = readl(i2c_dev->base + I2C_CTL);
-	writel(tmp | I2C_EN | I2C_INT_EN, i2c_dev->base + I2C_CTL);
+	writel(tmp | I2C_EN | I2C_INT_EN | I2C_NACK_EN | I2C_TRANS_EN, i2c_dev->base + I2C_CTL);
 }
 
 static int sprd_i2c_master_xfer(struct i2c_adapter *i2c_adap,
-- 
2.17.1