[PATCH v8 8/8] i2c: rk3x: support fast-mode plus for rk3399
From: David Wu <hidden>
Date: 2016-05-11 04:11:29
Also in:
linux-devicetree, linux-i2c, linux-rockchip, lkml
Subsystem:
arm/rockchip soc support, i2c subsystem, i2c subsystem host drivers, the rest · Maintainers:
Heiko Stuebner, Wolfram Sang, Andi Shyti, Linus Torvalds
Signed-off-by: David Wu <redacted> Reviewed-by: Douglas Anderson <dianders@chromium.org> --- 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 25ed1ad..0ba25ee 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