[PATCH 09/13] i2c: nomadik: fetch timeout-usecs property from devicetree

Théo Lebrun
2024-02-15T16:52:41Z

Allow overriding the default timeout value (200ms) from devicetree,
using the timeout-usecs property.

The i2c_adapter->timeout field is an unaccurate jiffies amount;
i2c-nomadik uses hrtimers for timeouts below one jiffy.

Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com>
---
drivers/i2c/busses/i2c-nomadik.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-nomadik.c b/drivers/i2c/busses/i2c-nomadik.c
index afd54999bbbb..23e12c570457 100644
--- a/drivers/i2c/busses/i2c-nomadik.c
+++ b/drivers/i2c/busses/i2c-nomadik.c
@@ -964,6 +964,8 @@ static const struct i2c_algorithm nmk_i2c_algo = {
static void nmk_i2c_of_probe(struct device_node *np,
struct nmk_i2c_dev *priv)
{
+ u32 timeout_usecs;
+
/* Default to 100 kHz if no frequency is given in the node */
if (of_property_read_u32(np, "clock-frequency", &priv->clk_freq))
priv->clk_freq = I2C_MAX_STANDARD_MODE_FREQ;
@@ -975,7 +977,12 @@ static void nmk_i2c_of_probe(struct device_node *np,
priv->sm = I2C_FREQ_MODE_FAST;
priv->tft = 1; /* Tx FIFO threshold */
priv->rft = 8; /* Rx FIFO threshold */
- priv->timeout_usecs = 200 * USEC_PER_MSEC; /* Slave response timeout */
+
+ /* Slave response timeout */
+ if (!of_property_read_u32(np, "timeout-usecs", &timeout_usecs))
+ priv->timeout_usecs = timeout_usecs;
+ else
+ priv->timeout_usecs = 200 * USEC_PER_MSEC;
}

static int nmk_i2c_probe(struct amba_device *adev, const struct amba_id *id)

--
2.43.1