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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2020-05-19 15:50:39 +0300 |
|---|---|---|
| committer | Wolfram Sang <wsa@kernel.org> | 2020-05-22 17:50:27 +0300 |
| commit | 20ee1d9020c9233129ba84094e7dd6fe4651cfad (patch) | |
| tree | ecf26a1e8ab41f12706422c2ad0552cc87a1e6be /drivers/i2c/busses/i2c-designware-common.c | |
| parent | a19f133f694c8f5549d46b43e4b30343b35c3aa5 (diff) | |
| download | linux-20ee1d9020c9233129ba84094e7dd6fe4651cfad.tar.xz | |
i2c: designware: Move i2c_dw_validate_speed() helper to a common code
In order to export array supported speed for wider use, move it
to a header along with i2c_dw_validate_speed() helper moved to
a common code.
No functional changes intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Diffstat (limited to 'drivers/i2c/busses/i2c-designware-common.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-designware-common.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-designware-common.c b/drivers/i2c/busses/i2c-designware-common.c index c70c6fc09ee3..9f06567be54a 100644 --- a/drivers/i2c/busses/i2c-designware-common.c +++ b/drivers/i2c/busses/i2c-designware-common.c @@ -116,6 +116,30 @@ int i2c_dw_set_reg_access(struct dw_i2c_dev *dev) return 0; } +int i2c_dw_validate_speed(struct dw_i2c_dev *dev) +{ + struct i2c_timings *t = &dev->timings; + unsigned int i; + + /* + * Only standard mode at 100kHz, fast mode at 400kHz, + * fast mode plus at 1MHz and high speed mode at 3.4MHz are supported. + */ + for (i = 0; i < ARRAY_SIZE(i2c_dw_supported_speeds); i++) { + if (t->bus_freq_hz == i2c_dw_supported_speeds[i]) + break; + } + if (i == ARRAY_SIZE(i2c_dw_supported_speeds)) { + dev_err(dev->dev, + "%d Hz is unsupported, only 100kHz, 400kHz, 1MHz and 3.4MHz are supported\n", + t->bus_freq_hz); + return -EINVAL; + } + + return 0; +} +EXPORT_SYMBOL_GPL(i2c_dw_validate_speed); + u32 i2c_dw_scl_hcnt(u32 ic_clk, u32 tSYMBOL, u32 tf, int cond, int offset) { /* |