linux-kernel - Re: [PATCH v2] i2c: rk3x: fix bug that cause measured high

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Message-ID: <20141203111518.GB1039@katana>
Date:	Wed, 3 Dec 2014 12:15:18 +0100
From:	Wolfram Sang <wsa@...-dreams.de>
To:	Addy Ke <addy.ke@...k-chips.com>
Cc:	max.schwarz@...ine.de, heiko@...ech.de, olof@...om.net,
	dianders@...omium.org, robh+dt@...nel.org, pawel.moll@....com,
	ijc+devicetree@...lion.org.uk, galak@...eaurora.org,
	linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, cf@...k-chips.com,
	xjq@...k-chips.com, huangtao@...k-chips.com, zyw@...k-chips.com,
	yzq@...k-chips.com, hj@...k-chips.com, kever.yang@...k-chips.com,
	hl@...k-chips.com, caesar.wang@...k-chips.com,
	zhengsq@...k-chips.com
Subject: Re: [PATCH v2] i2c: rk3x: fix bug that cause measured high_ns
 doesn't meet I2C spec


> + - rise-ns : Number of nanoseconds the signal takes to rise (t(r) in i2c spec).
> +	     If not specified this is assumed to be the max the spec allows
> +	     (1000 ns for standard mode, 300 ns for fast mode) which might
> +	     cause slightly slower communication.
> + - fall-ns : Number of nanoseconds the signal takes to fall (t(f) in the i2c0
> +	     spec).  If not specified this is assumed to be the max the spec
> +	     allows (300 ns) which might cause slightly slower communication.

We already have those bindings from the designware driver:

 - i2c-sda-hold-time-ns : should contain the SDA hold time in nanoseconds.
 - i2c-scl-falling-time : should contain the SCL falling time in nanoseconds.
 - i2c-sda-falling-time : should contain the SDA falling time in nanoseconds.

Can you reuse them? Or do you really need a specific rise-time property?
If so, please matche the style of the bindings above.


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