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i2c: rcar_i2c: Enable configuring SCL rise and fall times

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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>
This commit is contained in:
Adam Ford 2021-08-24 09:10:31 -05:00 committed by Heiko Schocher
parent 1d1f98c8ee
commit e53979cd34
1 changed files with 7 additions and 1 deletions
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8
drivers/i2c/rcar_i2c.c
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@ -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);