diff options
| author | Weifeng Voon <weifeng.voon@intel.com> | 2016-08-12 17:02:51 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2016-08-26 00:42:07 +0200 |
| commit | b6e67145f14903ca430e011db3b771d8de4c3d8a (patch) | |
| tree | ad3a693c96e5b48f1449dec578cbf248b36dd1a9 /drivers/i2c/busses/i2c-designware-platdrv.c | |
| parent | 548e6695d16d201f390f7554ae7d0b5bb8690166 (diff) | |
i2c: designware: Enable high speed mode
This patch enabled high speed mode. High speed mode can be turn on by
setting the clk_freq to 3400000. High speed HCNT and LCNT are needed
as there is no default value provided.
Signed-off-by: Weifeng Voon <weifeng.voon@intel.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-platdrv.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-platdrv.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/i2c/busses/i2c-designware-platdrv.c b/drivers/i2c/busses/i2c-designware-platdrv.c index d45481ee1b56..cb846cb50512 100644 --- a/drivers/i2c/busses/i2c-designware-platdrv.c +++ b/drivers/i2c/busses/i2c-designware-platdrv.c @@ -197,12 +197,12 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) /* * Only standard mode at 100kHz, fast mode at 400kHz, - * and fast mode plus at 1MHz are supported. + * fast mode plus at 1MHz and high speed mode at 3.4MHz are supported. */ if (dev->clk_freq != 100000 && dev->clk_freq != 400000 - && dev->clk_freq != 1000000) { + && dev->clk_freq != 1000000 && dev->clk_freq != 3400000) { dev_err(&pdev->dev, - "Only 100kHz, 400kHz and 1MHz are supported"); + "Only 100kHz, 400kHz, 1MHz and 3.4MHz supported"); return -EINVAL; } @@ -221,10 +221,16 @@ static int dw_i2c_plat_probe(struct platform_device *pdev) dev->master_cfg = DW_IC_CON_MASTER | DW_IC_CON_SLAVE_DISABLE | DW_IC_CON_RESTART_EN; - if (dev->clk_freq == 100000) + switch (dev->clk_freq) { + case 100000: dev->master_cfg |= DW_IC_CON_SPEED_STD; - else + break; + case 3400000: + dev->master_cfg |= DW_IC_CON_SPEED_HIGH; + break; + default: dev->master_cfg |= DW_IC_CON_SPEED_FAST; + } dev->clk = devm_clk_get(&pdev->dev, NULL); if (!i2c_dw_plat_prepare_clk(dev, true)) { |