diff options
| author | Adam Ford <aford173@gmail.com> | 2021-08-24 09:10:31 -0500 |
|---|---|---|
| committer | Heiko Schocher <hs@denx.de> | 2021-09-28 06:34:14 +0200 |
| commit | e53979cd34320c67c8d0213618c2999a45e0d578 (patch) | |
| tree | 9aceadc42cc4fa5aa2d80a5b097eec124b4bfe5b | |
| parent | 1d1f98c8eed7bb4792300e655c2cb70136928f74 (diff) | |
| download | u-boot-e53979cd34320c67c8d0213618c2999a45e0d578.tar.gz | |
i2c: rcar_i2c: Enable configuring SCL rise and fall times
The Linux i2c driver supports i2c-scl-rising-time-ns,
and i2c-scl-falling-time-ns, but U-Boot uses hard-coded values
for these values.
Update the calculation by fetching them from the device tree if
present and use the previous values as the default if they are
missing.
Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
| -rw-r--r-- | drivers/i2c/rcar_i2c.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/i2c/rcar_i2c.c b/drivers/i2c/rcar_i2c.c index 14bb6603d5..d9ece5e3a8 100644 --- a/drivers/i2c/rcar_i2c.c +++ b/drivers/i2c/rcar_i2c.c @@ -64,6 +64,8 @@ enum rcar_i2c_type { struct rcar_i2c_priv { void __iomem *base; struct clk clk; + u32 fall_ns; + u32 rise_ns; u32 intdelay; u32 icccr; enum rcar_i2c_type type; @@ -278,7 +280,7 @@ static int rcar_i2c_set_speed(struct udevice *dev, uint bus_freq_hz) * = F[sum * ick / 1000000000] * = F[(ick / 1000000) * sum / 1000] */ - sum = 35 + 200 + priv->intdelay; + sum = priv->fall_ns + priv->rise_ns + priv->intdelay; round = (ick + 500000) / 1000000 * sum; round = (round + 500) / 1000; @@ -323,6 +325,10 @@ static int rcar_i2c_probe(struct udevice *dev) int ret; priv->base = dev_read_addr_ptr(dev); + priv->rise_ns = dev_read_u32_default(dev, + "i2c-scl-rising-time-ns", 200); + priv->fall_ns = dev_read_u32_default(dev, + "i2c-scl-falling-time-ns", 35); priv->intdelay = dev_read_u32_default(dev, "i2c-scl-internal-delay-ns", 5); priv->type = dev_get_driver_data(dev); |