From mboxrd@z Thu Jan 1 00:00:00 1970 From: Benoit Cousson Date: Fri, 28 Feb 2014 14:15:32 +0000 Subject: Re: [RFC 0/4] ARM: shmobile: Add CPUFreq support for r8a7790-lager platform Message-Id: <53109A04.1010508@baylibre.com> List-Id: References: <1393456190-7870-1-git-send-email-bcousson@baylibre.com> In-Reply-To: <1393456190-7870-1-git-send-email-bcousson@baylibre.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: linux-sh@vger.kernel.org Salut Laurent, On 28/02/2014 14:53, Laurent Pinchart wrote: > Hi Benoit, > > On Thursday 27 February 2014 00:09:46 Benoit Cousson wrote: >> Hi Magnus, >> >> This not-yet-ready-to-merge series is adding CPUFreq support to Lager bo= ard. >> >> Due to the missing data for the OPP voltage values, a safe 1.0v value is >> used for all OPPs. >> >> At least this series can be used by Laurent to test the z-clock CCF node >> and the KICK bit fix I've just sent. >> >> Bottom-line, no real DVFS so far, but just DFS :-) >> >> Please note that this series is safe even in the case of Cortex A7 boot >> since the cpufreq-cpu0 driver is using the physical CPU@0 device node. >> In the case of CA7 boot, the first cpu will be the CPU@100, and thus >> the driver will fail at probe time due to the lack of CPU@0. > > I'd like to test that on r8a7791, can I use the same parameters (voltages, > frequencies and OPPs) ? For the frequency, it will be similar since the r8a7791 seems to run at=20 1.3 GHz as well. For the voltage, it should be similar, but I do not have any information=20 and I'm not sure that the regulator used on the Koelsh board is the same=20 (da9210). It might be safer to remove the phandle to the regulator. I hope the cpufreq-cpu0 driver probe will not fail becasue of that. Regards, Benoit --=20 Beno=EEt Cousson BayLibre Embedded Linux Technology Lab www.baylibre.com