linux-kernel - Re: [PATCH v5 2/2] i2c: rk3x: add i2c support for rk3399 soc

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Date:	Fri, 15 Apr 2016 19:58:46 +0200
From:	Wolfram Sang <wsa@...-dreams.de>
To:	"David.Wu" <david.wu@...k-chips.com>
Cc:	heiko@...ech.de, dianders@...omium.org, andy.shevchenko@...il.com,
	huangtao@...k-chips.com, hl@...k-chips.com, xjq@...k-chips.com,
	zyw@...k-chips.com, cf@...k-chips.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org, David Wu <wdc@...k-chips.com>
Subject: Re: [PATCH v5 2/2] i2c: rk3x: add i2c support for rk3399 soc

> The default frequency rate of function clock is 50M Hz, it can match
> F/S mode, but HS mode not. If use default rate 50M to get 1.7M
> scl-frequency rate , we could not get accurately 1.7M frequecy rate.
> The input-clk-rate is more higher, we get more accurately
> scl-frequency rate,  as 200M is a suitable input-clk-rate.
> 
> If 200M was used for F/S mode, it would increase power consumption, so
> add a option that could be configured from DT.

If I understand you correctly, couldn't you use clk_set_rate() depending
on the desired scl frequency which is already described in DT as
clock-frequency?


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