linux-kernel - Re: [PATCH v2 08/11] i2c: nomadik: fetch i2c-transfer-timeout-us property from devicetree

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Date: Mon, 4 Mar 2024 10:25:38 +0100
From: Wolfram Sang <wsa@...nel.org>
To: Théo Lebrun <theo.lebrun@...tlin.com>
Cc: 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>,
	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>
Subject: Re: [PATCH v2 08/11] i2c: nomadik: fetch i2c-transfer-timeout-us
 property from devicetree

On Thu, Feb 29, 2024 at 07:10:56PM +0100, Théo Lebrun wrote:
> Allow overriding the default timeout value (200ms) from devicetree,
> using the generic i2c-transfer-timeout-us 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>

I agree to get the DT property here in the driver. We may later refactor
it to handle it in the I2C core. Syncing this new property with the
existing 'adapter->timeout' will be a tad annoying, though. But I guess
the shorter timeouts are a desired feature these days...

Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>


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