From e53979cd34320c67c8d0213618c2999a45e0d578 Mon Sep 17 00:00:00 2001 From: Adam Ford Date: Tue, 24 Aug 2021 09:10:31 -0500 Subject: [PATCH] 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 Reviewed-by: Heiko Schocher --- drivers/i2c/rcar_i2c.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) 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); -- 2.39.5