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Date: Thu, 12 May 2016 16:01:15 +0800 From: David Wu <david.wu@...k-chips.com> To: heiko@...ech.de, wsa@...-dreams.de Cc: robh+dt@...nel.org, dianders@...omium.org, andy.shevchenko@...il.com, pawel.moll@....com, mark.rutland@....com, ijc+devicetree@...lion.org.uk, galak@...eaurora.org, briannorris@...gle.com, davidriley@...gle.com, huangtao@...k-chips.com, hl@...k-chips.com, xjq@...k-chips.com, zyw@...k-chips.com, cf@...k-chips.com, linux-arm-kernel@...ts.infradead.org, linux-rockchip@...ts.infradead.org, linux-i2c@...r.kernel.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, David Wu <david.wu@...k-chips.com> Subject: [PATCH v9 8/8] 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@...k-chips.com> Reviewed-by: Douglas Anderson <dianders@...omium.org> Tested-by: Caesar Wang <wxt@...k-chips.com> Reviewed-by: Heiko Stuebner <heiko@...ech.de> --- Change in v9: - add commit message Change in v8: - none drivers/i2c/busses/i2c-rk3x.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-rk3x.c b/drivers/i2c/busses/i2c-rk3x.c index 673656e..ba4ce39 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 @@ -531,8 +542,10 @@ 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; } /** @@ -743,9 +756,9 @@ 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)) -- 1.9.1
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