The Synopsys i2c driver allows a user to override the parameters controlling the waveform using ACPI; this is useful for fine tuning when needed to make spec compliance. Extend this support to the device tree to allow non-ACPI platforms the same capabilities. Signed-off-by: Aahil Awatramani <aahila@xxxxxxxxxx> --- drivers/i2c/busses/i2c-designware-platdrv.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 855b698e99c0..09c464874fdb 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -132,6 +132,17 @@ static int mscc_twi_set_sda_hold_time(struct dw_i2c_dev *dev) return 0; } +static void i2c_parse_cnt(struct device *dev, char *prop_name, u16 *cnt) +{ + u32 tmp_cnt; + int ret; + + ret = device_property_read_u32(dev, prop_name, &tmp_cnt); + if (ret) + return; + *cnt = tmp_cnt; +} + static int dw_i2c_of_configure(struct platform_device *pdev) { struct dw_i2c_dev *dev = platform_get_drvdata(pdev); @@ -146,6 +157,15 @@ static int dw_i2c_of_configure(struct platform_device *pdev) break; } + i2c_parse_cnt(&pdev->dev, "i2c-scl-ss-hcnt", &dev->ss_hcnt); + i2c_parse_cnt(&pdev->dev, "i2c-scl-ss-lcnt", &dev->ss_lcnt); + i2c_parse_cnt(&pdev->dev, "i2c-scl-fs-hcnt", &dev->fs_hcnt); + i2c_parse_cnt(&pdev->dev, "i2c-scl-fs-lcnt", &dev->fs_lcnt); + i2c_parse_cnt(&pdev->dev, "i2c-scl-fp-hcnt", &dev->fp_hcnt); + i2c_parse_cnt(&pdev->dev, "i2c-scl-fp-lcnt", &dev->fp_lcnt); + i2c_parse_cnt(&pdev->dev, "i2c-scl-hs-hcnt", &dev->hs_hcnt); + i2c_parse_cnt(&pdev->dev, "i2c-scl-hs-lcnt", &dev->hs_lcnt); + return 0; } -- 2.43.0.429.g432eaa2c6b-goog