i2c: mediatek: Add i2c compatible for MediaTek MT2712

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.gao@mediatek.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

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 {
@@ -176,13 +179,23 @@ static const struct i2c_adapter_quirks mt7622_i2c_quirks = {
 	.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,
 	.dcm = 1,
 	.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 @@ static const struct mtk_i2c_compatible mt6589_compat = {
 	.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 @@ static const struct mtk_i2c_compatible mt7622_compat = {
 	.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 @@ static const struct mtk_i2c_compatible mt8173_compat = {
 	.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;