[PATCH 2/3] i2c: mediatek: Add i2c compatible for MediaTek MT2712

[Jun Gao]

From: Jun Gao <jun....@mediatek.com>

Add i2c compatible for MT2712. Compare to MT8173 i2c controller,
internal divider of i2c source clock need to be configured for
MT2712 i2c speed calculation.

Signed-off-by: Jun Gao <jun....@mediatek.com>
---
 drivers/i2c/busses/i2c-mt65xx.c | 31 +++++++++++++++++++++++++++----
 1 file changed, 27 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c
index 09d288c..58d6401 100644
--- a/drivers/i2c/busses/i2c-mt65xx.c
+++ b/drivers/i2c/busses/i2c-mt65xx.c
@@ -61,6 +61,7 @@
 #define I2C_DMA_HARD_RST               0x0002
 #define I2C_DMA_4G_MODE                        0x0001
 
+#define I2C_DEFAULT_CLK_DIV            5
 #define I2C_DEFAULT_SPEED              100000  /* hz */
 #define MAX_FS_MODE_SPEED              400000
 #define MAX_HS_MODE_SPEED              3400000
@@ -127,6 +128,7 @@ enum I2C_REGS_OFFSET {
        OFFSET_DEBUGSTAT = 0x64,
        OFFSET_DEBUGCTRL = 0x68,
        OFFSET_TRANSFER_LEN_AUX = 0x6c,
+       OFFSET_CLOCK_DIV = 0x70,
 };
 
 struct mtk_i2c_compatible {
@@ -136,6 +138,7 @@ struct mtk_i2c_compatible {
        unsigned char auto_restart: 1;
        unsigned char aux_len_reg: 1;
        unsigned char support_33bits: 1;
+       unsigned char timing_adjust: 1;
 };
 
 struct mtk_i2c {
@@ -176,6 +179,15 @@ struct mtk_i2c {
        .max_num_msgs = 255,
 };
 
+static const struct mtk_i2c_compatible mt2712_compat = {
+       .pmic_i2c = 0,
+       .dcm = 1,
+       .auto_restart = 1,
+       .aux_len_reg = 1,
+       .support_33bits = 1,
+       .timing_adjust = 1,
+};
+
 static const struct mtk_i2c_compatible mt6577_compat = {
        .quirks = &mt6577_i2c_quirks,
        .pmic_i2c = 0,
@@ -183,6 +195,7 @@ struct mtk_i2c {
        .auto_restart = 0,
        .aux_len_reg = 0,
        .support_33bits = 0,
+       .timing_adjust = 0,
 };
 
 static const struct mtk_i2c_compatible mt6589_compat = {
@@ -192,6 +205,7 @@ struct mtk_i2c {
        .auto_restart = 0,
        .aux_len_reg = 0,
        .support_33bits = 0,
+       .timing_adjust = 0,
 };
 
 static const struct mtk_i2c_compatible mt7622_compat = {
@@ -201,6 +215,7 @@ struct mtk_i2c {
        .auto_restart = 1,
        .aux_len_reg = 1,
        .support_33bits = 0,
+       .timing_adjust = 0,
 };
 
 static const struct mtk_i2c_compatible mt8173_compat = {
@@ -209,9 +224,11 @@ struct mtk_i2c {
        .auto_restart = 1,
        .aux_len_reg = 1,
        .support_33bits = 1,
+       .timing_adjust = 0,
 };
 
 static const struct of_device_id mtk_i2c_of_match[] = {
+       { .compatible = "mediatek,mt2712-i2c", .data = &mt2712_compat },
        { .compatible = "mediatek,mt6577-i2c", .data = &mt6577_compat },
        { .compatible = "mediatek,mt6589-i2c", .data = &mt6589_compat },
        { .compatible = "mediatek,mt7622-i2c", .data = &mt7622_compat },
@@ -271,6 +288,9 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c)
        if (i2c->dev_comp->dcm)
                writew(I2C_DCM_DISABLE, i2c->base + OFFSET_DCM_EN);
 
+       if (i2c->dev_comp->timing_adjust)
+               writew(I2C_DEFAULT_CLK_DIV - 1, i2c->base + OFFSET_CLOCK_DIV);
+
        writew(i2c->timing_reg, i2c->base + OFFSET_TIMING);
        writew(i2c->high_speed_reg, i2c->base + OFFSET_HS);
 
@@ -725,10 +745,6 @@ static int mtk_i2c_probe(struct platform_device *pdev)
        if (!i2c)
                return -ENOMEM;
 
-       ret = mtk_i2c_parse_dt(pdev->dev.of_node, i2c);
-       if (ret)
-               return -EINVAL;
-
        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
        i2c->base = devm_ioremap_resource(&pdev->dev, res);
        if (IS_ERR(i2c->base))
@@ -759,6 +775,13 @@ static int mtk_i2c_probe(struct platform_device *pdev)
        i2c->adap.timeout = 2 * HZ;
        i2c->adap.retries = 1;
 
+       ret = mtk_i2c_parse_dt(pdev->dev.of_node, i2c);
+       if (ret)
+               return -EINVAL;
+
+       if (i2c->dev_comp->timing_adjust)
+               i2c->clk_src_div *= I2C_DEFAULT_CLK_DIV;
+
        if (i2c->have_pmic && !i2c->dev_comp->pmic_i2c)
                return -EINVAL;
 
-- 
1.8.1.1