diff options
| author |   David Wu <david.wu@rock-chips.com> | 2016-05-16 22:06:29 +0800 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2016-06-17 13:55:28 +0200 |
| commit | a02f3d081a79ec702b85b9c1a91edf770cf1eab2 (patch) | |
| tree | f42cc141947a938cec2f4967f20cc2aaebcbbb2c /drivers/i2c | |
| parent | i2c: rk3x: add i2c support for rk3399 soc (diff) | |
| download | linux-dev-a02f3d081a79ec702b85b9c1a91edf770cf1eab2.tar.xz linux-dev-a02f3d081a79ec702b85b9c1a91edf770cf1eab2.zip | |
i2c: rk3x: support fast-mode plus for rk3399
Implement fast mode plus that allows bus speeds of up to 1MHz.
Signed-off-by: David Wu <david.wu@rock-chips.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Caesar Wang <wxt@rock-chips.com>
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-rk3x.c | 21 |
1 files changed, 17 insertions, 4 deletions
diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index e9ce6a33e8c4..2bc8b01153d6 100644 --- a/drivers/i2c/busses/i2c-rk3x.c +++ b/drivers/i2c/busses/i2c-rk3x.c @@ -126,6 +126,17 @@ static const struct i2c_spec_values fast_mode_spec = { .min_hold_buffer_ns = 1300, }; +static const struct i2c_spec_values fast_mode_plus_spec = { + .min_hold_start_ns = 260, + .min_low_ns = 500, + .min_high_ns = 260, + .min_setup_start_ns = 260, + .max_data_hold_ns = 400, + .min_data_setup_ns = 50, + .min_setup_stop_ns = 260, + .min_hold_buffer_ns = 500, +}; + /** * struct rk3x_i2c_calced_timings: * @div_low: Divider output for low @@ -532,8 +543,10 @@ static const struct i2c_spec_values *rk3x_i2c_get_spec(unsigned int speed) { if (speed <= 100000) return &standard_mode_spec; - else + else if (speed <= 400000) return &fast_mode_spec; + else + return &fast_mode_plus_spec; } /** @@ -744,9 +757,9 @@ static int rk3x_i2c_v1_calc_timings(unsigned long clk_rate, const struct i2c_spec_values *spec; int ret = 0; - /* Support standard-mode and fast-mode */ - if (WARN_ON(t->bus_freq_hz > 400000)) - t->bus_freq_hz = 400000; + /* Support standard-mode, fast-mode and fast-mode plus */ + if (WARN_ON(t->bus_freq_hz > 1000000)) + t->bus_freq_hz = 1000000; /* prevent scl_rate_khz from becoming 0 */ if (WARN_ON(t->bus_freq_hz < 1000)) |