From mboxrd@z Thu Jan 1 00:00:00 1970 From: robert.jarzmik@free.fr (Robert Jarzmik) Date: Fri, 04 Jul 2014 00:14:49 +0200 Subject: [PATCH 0/4] Migrate PXA27x platforms to clock framework In-Reply-To: (Haojian Zhuang's message of "Thu, 3 Jul 2014 14:21:14 +0800") References: <1404066744-13416-1-git-send-email-robert.jarzmik@free.fr> <7034630.fvV46PN35C@wuerfel> <877g3yp7ie.fsf@free.fr> Message-ID: <87lhsanl7q.fsf@free.fr> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Haojian Zhuang writes: >> Haojian, are you ok with that ? And BTW, does a combined kernel for PXA >> platforms even exists (mixing pxa3xx and pxa2xx for example) ? >> > > It's acceptable to me that different silicons are queued in different stages. > I only request that it won't break the compiler building & bootup. OK. > > But I think that the pxa clock driver may be shared among all PXA silicons > except for the clock table. What's your opinion? I don't think so because of the core clocks. These ones are specific to each pxa, and so their computation is : - pxa25x plays with CCCR and specific L, M and N2 multiplication tables - pxa27x plays with CCCR and specific L, M and N2 multiplication tables - pxa3xx plays with ASCR, MEMCLKCFG, and AC97 div I don't see very well how a clock table could describe that. Do you have something specific in mind ? >>> Also (for my understanding) when you say that you plan to do >>> pxa25x and pxa3xx next, does that include pxa26x and pxa93x? >> I don't have the Technical Reference Manuals for these ones so the answer is >> no. And Google wasn't a great friend at providing them. >> > > Converting them into new clock driver may not rely on the reference manual. Actually I went through the code and : - pxa26x is only a superset of pxa25x with one more clock : pxa26x-gpio - pxa93x is the same clock set as pxa3xx, right ? So if I convert pxa25x, pxa27x and pxa3xx I'll cover everything, right ? >>> I assume it does as they are apparently minor revisions of the >>> former, but it's not completely clear from your description. >> My description doesn't mention them, as I have no information about them, nor >> any hardware to test on. >> > > We can request others to help testing in the mailing list. That's exactly what will enable pxa25x and pxa3xx. I have them converted in my tree, but I don't want to mix these patches in as I can't test them, and testing brings in bigger delays. Cheers. -- Robert