Commit a15c91ba authored by Qii Wang's avatar Qii Wang Committed by Wolfram Sang
Browse files

i2c: mediatek: Add i2c and apdma sync in i2c driver 



When i2c and apdma use different source clocks, we should enable
synchronization between them.

Signed-off-by: default avatarQii Wang <qii.wang@mediatek.com>
Reviewed-by: default avatarNicolas Boichat <drinkcat@chromium.org>
Reviewed-by: default avatarMatthias Brugger <matthias.bgg@gmail.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent cad6dc5d

drivers/i2c/busses/i2c-mt65xx.c

+11 −0
Original line number Diff line number Diff line
@@ -77,6 +77,8 @@ 
#define I2C_CONTROL_DIR_CHANGE          (0x1 << 4)

#define I2C_CONTROL_ACKERR_DET_EN       (0x1 << 5)

#define I2C_CONTROL_TRANSFER_LEN_CHANGE (0x1 << 6)

#define I2C_CONTROL_DMAACK_EN           (0x1 << 8)

#define I2C_CONTROL_ASYNC_MODE          (0x1 << 9)

#define I2C_CONTROL_WRAPPER             (0x1 << 0)



#define I2C_DRV_NAME		"i2c-mt65xx"
@@ -169,6 +171,7 @@ struct mtk_i2c_compatible { 
	unsigned char aux_len_reg: 1;

	unsigned char support_33bits: 1;

	unsigned char timing_adjust: 1;

	unsigned char dma_sync: 1;

};



struct mtk_i2c {
@@ -218,6 +221,7 @@ static const struct mtk_i2c_compatible mt2712_compat = { 
	.aux_len_reg = 1,

	.support_33bits = 1,

	.timing_adjust = 1,

	.dma_sync = 0,

};



static const struct mtk_i2c_compatible mt6577_compat = {
@@ -229,6 +233,7 @@ static const struct mtk_i2c_compatible mt6577_compat = { 
	.aux_len_reg = 0,

	.support_33bits = 0,

	.timing_adjust = 0,

	.dma_sync = 0,

};



static const struct mtk_i2c_compatible mt6589_compat = {
@@ -240,6 +245,7 @@ static const struct mtk_i2c_compatible mt6589_compat = { 
	.aux_len_reg = 0,

	.support_33bits = 0,

	.timing_adjust = 0,

	.dma_sync = 0,

};



static const struct mtk_i2c_compatible mt7622_compat = {
@@ -251,6 +257,7 @@ static const struct mtk_i2c_compatible mt7622_compat = { 
	.aux_len_reg = 1,

	.support_33bits = 0,

	.timing_adjust = 0,

	.dma_sync = 0,

};



static const struct mtk_i2c_compatible mt8173_compat = {
@@ -261,6 +268,7 @@ static const struct mtk_i2c_compatible mt8173_compat = { 
	.aux_len_reg = 1,

	.support_33bits = 1,

	.timing_adjust = 0,

	.dma_sync = 0,

};



static const struct of_device_id mtk_i2c_of_match[] = {
@@ -360,6 +368,9 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c) 


	control_reg = I2C_CONTROL_ACKERR_DET_EN |

		      I2C_CONTROL_CLK_EXT_EN | I2C_CONTROL_DMA_EN;

	if (i2c->dev_comp->dma_sync)

		control_reg |= I2C_CONTROL_DMAACK_EN | I2C_CONTROL_ASYNC_MODE;



	mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL);

	mtk_i2c_writew(i2c, I2C_DELAY_LEN, OFFSET_DELAY_LEN);

CRA Git | Maintained and supported by SUSTech CRA and CCSE