linux-kernel - Re: [PATCH] cpufreq: rockchip: add driver

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Message-ID: <56EFF610.6040402@rock-chips.com>
Date:	Mon, 21 Mar 2016 21:24:32 +0800
From:	Feng Xiao <xf@...k-chips.com>
To:	Viresh Kumar <viresh.kumar@...aro.org>,
	Heiko Stübner <heiko@...ech.de>
Cc:	linux@....linux.org.uk, rjw@...ysocki.net,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, wxt@...k-chips.com, zyw@...k-chips.com,
	jay.xu@...k-chips.com, tim.chen@...k-chips.com, xxx@...k-chips.com,
	huangtao@...k-chips.com, Stephen Boyd <sboyd@...eaurora.org>,
	Michael Turquette <mturquette@...libre.com>
Subject: Re: [PATCH] cpufreq: rockchip: add driver



在 2016/3/21 17:58, Viresh Kumar 写道:
> On 21-03-16, 10:54, Heiko Stübner wrote:
>> I hadn't seen that yet ... nice that cpufreq-dt now also supports clusters :-)
>>
>> The other part still stands though, as we probably should register the
>> platform-device somewhere else and not in some new special module.
>>
>> When everything is using cpufreq-dt now, I guess we could just add it to the
>> core rockchip clk-code. Or was there some agreement where this should be done
>> (obviously not the devicetree itself)?
Of_clk_init is called early, and platform_device_register_simple should 
be called after devices_init, it will be failed to do it from clk-code.
So we need add a new file or add module_init to each clock controller 
driver(like clk-rk3368.c, clk-rk3399.c) ?
> Yeah, there was a discussion around creating a white or black list of platforms
> that want to create a platform device for cpufreq-dt. That can be done in
> cpufreq-dt.c or a new file, but I haven't worked out on that yet.
>
> You can do it from clk-code or from the driver that was added in this thread.
> Just that you need to match your platform's compatible string before doing that.
Rockchip-cpufreq.c depends on ARM_ROCKCHIP_CPUFREQ, it will not be 
compiled on non-Rockchip platforms.
The driver can support all Rockchip SoCs up to now, add 
of_machine_is_compatible may be redundant ?
>