linux-kernel - [PATCH V2 1/7] i2c: sprd: Add configurations that support 1Mhz and 3.4Mhz frequencies

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Date:   Mon, 23 Oct 2023 16:11:52 +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 1/7] i2c: sprd: Add configurations that support 1Mhz and 3.4Mhz frequencies

Add support for 1Mhz and 3.4Mhz frequency configuration.

Signed-off-by: Huangzheng Lai <Huangzheng.Lai@...soc.com>
Acked-by: Andi Shyti <andi.shyti@...nel.org>
---
 drivers/i2c/busses/i2c-sprd.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/drivers/i2c/busses/i2c-sprd.c b/drivers/i2c/busses/i2c-sprd.c
index ffc54fbf814d..b44916c6741d 100644
--- a/drivers/i2c/busses/i2c-sprd.c
+++ b/drivers/i2c/busses/i2c-sprd.c
@@ -343,10 +343,23 @@ static void sprd_i2c_set_clk(struct sprd_i2c *i2c_dev, u32 freq)
 	writel(div1, i2c_dev->base + ADDR_DVD1);
 
 	/* Start hold timing = hold time(us) * source clock */
-	if (freq == I2C_MAX_FAST_MODE_FREQ)
-		writel((6 * apb_clk) / 10000000, i2c_dev->base + ADDR_STA0_DVD);
-	else if (freq == I2C_MAX_STANDARD_MODE_FREQ)
+	switch (freq) {
+	case I2C_MAX_STANDARD_MODE_FREQ:
 		writel((4 * apb_clk) / 1000000, i2c_dev->base + ADDR_STA0_DVD);
+		break;
+	case I2C_MAX_FAST_MODE_FREQ:
+		writel((6 * apb_clk) / 10000000, i2c_dev->base + ADDR_STA0_DVD);
+		break;
+	case I2C_MAX_FAST_MODE_PLUS_FREQ:
+		writel((8 * apb_clk) / 10000000, i2c_dev->base + ADDR_STA0_DVD);
+		break;
+	case I2C_MAX_HIGH_SPEED_MODE_FREQ:
+		writel((8 * apb_clk) / 10000000, i2c_dev->base + ADDR_STA0_DVD);
+		break;
+	default:
+		dev_err(i2c_dev->dev, "Unsupported frequency: %d\n", freq);
+		break;
+	}
 }
 
 static void sprd_i2c_enable(struct sprd_i2c *i2c_dev)
@@ -519,9 +532,11 @@ static int sprd_i2c_probe(struct platform_device *pdev)
 	if (!of_property_read_u32(dev->of_node, "clock-frequency", &prop))
 		i2c_dev->bus_freq = prop;
 
-	/* We only support 100k and 400k now, otherwise will return error. */
+	/* We only support 100k\400k\1m\3.4m now, otherwise will return error. */
 	if (i2c_dev->bus_freq != I2C_MAX_STANDARD_MODE_FREQ &&
-	    i2c_dev->bus_freq != I2C_MAX_FAST_MODE_FREQ)
+			i2c_dev->bus_freq != I2C_MAX_FAST_MODE_FREQ &&
+			i2c_dev->bus_freq != I2C_MAX_FAST_MODE_PLUS_FREQ &&
+			i2c_dev->bus_freq != I2C_MAX_HIGH_SPEED_MODE_FREQ)
 		return -EINVAL;
 
 	ret = sprd_i2c_clk_init(i2c_dev);
-- 
2.17.1