linux-kernel - Re: [PATCH 1/2] cpufreq: mediatek: Add MT8173 cpufreq driver

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Date:	Fri, 24 Apr 2015 14:50:04 +0800
From:	Pi-Cheng Chen <pi-cheng.chen@...aro.org>
To:	Mark Rutland <mark.rutland@....com>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	Mike Turquette <mturquette@...aro.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	"Joe.C" <yingjoe.chen@...iatek.com>,
	Eddie Huang <eddie.huang@...iatek.com>,
	Howard Chen <ibanezchen@...il.com>,
	"fan.chen@...iatek.com" <fan.chen@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-mediatek@...ts.infradead.org" 
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH 1/2] cpufreq: mediatek: Add MT8173 cpufreq driver

On Thu, Apr 23, 2015 at 8:56 PM, Mark Rutland <mark.rutland@....com> wrote:
>> +/*
>> + * This is a temporary solution until we have new OPPv2 bindings. Therefore we
>> + * could describe the OPPs with (freq, volt, volt) tuple properly in device
>> + * tree.
>> + */
>> +
>> +/* OPP table for LITTLE cores of MT8173 */
>> +struct mtk_cpu_opp mt8173_l_opp[] = {
>> +       OPP(507000000, 859000, 0),
>> +       OPP(702000000, 908000, 0),
>> +       OPP(1001000000, 983000, 0),
>> +       OPP(1105000000, 1009000, 0),
>> +       OPP(1183000000, 1028000, 0),
>> +       OPP(1404000000, 1083000, 0),
>> +       OPP(1508000000, 1109000, 0),
>> +       OPP(1573000000, 1125000, 0),
>> +};
>> +
>> +/* OPP table for big cores of MT8173 */
>> +struct mtk_cpu_opp mt8173_b_opp[] = {
>> +       OPP(507000000, 828000, 928000),
>> +       OPP(702000000, 867000, 967000),
>> +       OPP(1001000000, 927000, 1027000),
>> +       OPP(1209000000, 968000, 1068000),
>> +       OPP(1404000000, 1007000, 1107000),
>> +       OPP(1612000000, 1049000, 1149000),
>> +       OPP(1807000000, 1089000, 1150000),
>> +       OPP(1989000000, 1125000, 1150000),
>> +};
>
> We should sort out the OPP bindings if we need to sort out the OPP
> bindings. We can't remove these once they're in without causing pain for
> everyone with an old DTB.

So even we have a new OPP binding to describe the OPP, we have to
leave these table as they are for backward compatibility?

Best Regards,
Pi-Cheng

>
> Mark.
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