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

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Date: Thu, 15 Feb 2024 17:52:16 +0100
From: Théo Lebrun <theo.lebrun@...tlin.com>
To: Linus Walleij <linus.walleij@...aro.org>, 
 Andi Shyti <andi.shyti@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: linux-arm-kernel@...ts.infradead.org, linux-i2c@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-mips@...r.kernel.org, Gregory Clement <gregory.clement@...tlin.com>, 
 Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Tawfik Bayouk <tawfik.bayouk@...ileye.com>, 
 Théo Lebrun <theo.lebrun@...tlin.com>
Subject: [PATCH 09/13] i2c: nomadik: fetch timeout-usecs property from
 devicetree

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@...tlin.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