diff options
| author | Tom <support@vamrs.com> | 2021-01-07 22:25:24 +0300 |
|---|---|---|
| committer | Emil Renner Berthing <kernel@esmil.dk> | 2021-06-07 02:11:17 +0300 |
| commit | 2eab70491f515aa085148be84ef37594fd43806f (patch) | |
| tree | e34d246c844f37246fd03142a0a29e710cb0e595 | |
| parent | 62a62eb36f6a26c3ca221a6c83bace8e7e534921 (diff) | |
| download | linux-2eab70491f515aa085148be84ef37594fd43806f.tar.xz | |
drivers/i2c: Improve Synopsys DesignWare I2C adapter driver for StarFive VIC7100
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index 4b37f28ec0c6..904694a19e51 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -39,6 +39,21 @@ static u32 i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) return clk_get_rate(dev->clk)/1000; } +#ifdef CONFIG_SOC_STARFIVE_VIC7100 +static u32 starfive_i2c_dw_get_clk_rate_khz(struct dw_i2c_dev *dev) +{ + u32 val; + + if(!device_property_read_u32(dev->dev, "clocks", &val)) { + dev_info(dev->dev, "Using 'clocks' : %u / 1000", val); + return (val / 1000); + } else { + dev_info(dev->dev, "Using the static setting value: 49500"); + return 49500; + } +} +#endif + #ifdef CONFIG_ACPI static const struct acpi_device_id dw_i2c_acpi_match[] = { { "INT33C2", 0 }, @@ -271,6 +286,18 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) if (!dev->sda_hold_time && t->sda_hold_ns) dev->sda_hold_time = div_u64(clk_khz * t->sda_hold_ns + 500000, 1000000); +#ifdef CONFIG_SOC_STARFIVE_VIC7100 + } else { + u64 clk_khz; + + dev->get_clk_rate_khz = starfive_i2c_dw_get_clk_rate_khz; + clk_khz = dev->get_clk_rate_khz(dev); + + if (!dev->sda_hold_time && t->sda_hold_ns) + dev->sda_hold_time = + div_u64(clk_khz * t->sda_hold_ns + 500000, + 1000000); +#endif } adap = &dev->adapter; |