From mboxrd@z Thu Jan 1 00:00:00 1970 From: nicolas.ferre@atmel.com (Nicolas Ferre) Date: Wed, 25 Mar 2015 19:18:19 +0100 Subject: at91 clocks In-Reply-To: <20150325173751.0d6479df@bbrezillon> References: <55117568.6090202@microbit.se> <20150325013201.3f01fc22@bbrezillon> <55127AA6.5050902@microbit.se> <20150325173751.0d6479df@bbrezillon> Message-ID: <5512FBEB.2060609@atmel.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Le 25/03/2015 17:37, Boris Brezillon a ?crit : > Hi Jonas, > > On Wed, 25 Mar 2015 10:06:46 +0100 > Jonas Andersson wrote: > >> Hi Boris and others, >> >> On 2015-03-25 01:32, Boris Brezillon wrote: >>> Hi Jonas, >>> >>> On Tue, 24 Mar 2015 15:32:08 +0100 >>> Jonas Andersson wrote: >>> >>>> Hi all, >>>> >>>> I am working on a system with at91sam9260 soc. Trying to move from >>>> kernel 3.17.4 to 3.19.2. I have problem with pck1 clock. >>>> >>>> In my old code i use clk_get() to get pck1 and pllb, set pllb as parent >>>> for pck1, set rate for pck1, enable pck1. >>> How do you do that (clk_set_parent + clk_set_rate) ? >>> Could you paste your code somewhere ? >> >> Yes, see http://pastie.org/10052161 > > Your pllb seems to be configured to output a 0Hz rate, and I'm not > forwarding rate change to prog clk parents yet. > That's definitely something I should work on, but in the meantime you > could try to manually set pllb rate. > >> >>> >>>> Extract from >>>> /sys/kernel/debug/at91_clk: >>>> pllb users= 1 on 96000000 Hz main >>>> pck1 users= 1 on 12000000 Hz pllb >>>> >>> With the new implementation calling clk_set_rate(pck1, 120000000) >>> should do the job: it should choose the best parent clk and divisor. >> >> Ok thank you for that information. I tried that now (new code in link >> above), and i got a clock output but not exactly my wanted 12MHz. I >> measure 9.216MHz at pck1 output. >> >> mainck 2 2 >> 18432000 0 0 >> prog1 1 1 >> 9216000 0 0 >> pck1 1 1 >> 9216000 0 0 >> >> pllbck is still unused. >> >> I tried kernel 4.0-rc5 but it hangs in boot after ethernet init. > > Is this related to the changes I suggested ? It seems to be related as I tried to boot an at91sam9260ek with current Linus' tree and it doesn't hangs after Ethernet on my side... Bye, -- Nicolas Ferre