From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Jones Subject: Re: [PATCH v2] cpufreq: st: enable selective initialization based on the platform Date: Thu, 28 Apr 2016 08:19:07 +0100 Message-ID: <20160428071907.GH4892@dell> References: <1461757227-22381-1-git-send-email-sudeep.holla@arm.com> <1461773939-1004-1-git-send-email-sudeep.holla@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <1461773939-1004-1-git-send-email-sudeep.holla@arm.com> Sender: linux-kernel-owner@vger.kernel.org To: Sudeep Holla Cc: linux-kernel@vger.kernel.org, Viresh Kumar , "Rafael J. Wysocki" , linux-pm@vger.kernel.org List-Id: linux-pm@vger.kernel.org On Wed, 27 Apr 2016, Sudeep Holla wrote: > The sti-cpufreq does unconditional registration of the cpufreq-dt dri= ver > which causes issue on an multi-platform build. For example, on Vexpre= ss > TC2 platform, we get the following error on boot: >=20 > cpu cpu0: OPP-v2 not supported > cpu cpu0: Not doing voltage scaling > cpu: dev_pm_opp_of_cpumask_add_table: couldn't find opp table > for cpu:0, -19 > cpu cpu0: dev_pm_opp_get_max_volt_latency: Invalid regulator (-6) > ... > arm_big_little: bL_cpufreq_register: Failed registering platform driv= er: > vexpress-spc, err: -17 >=20 > The actual driver fails to initialise as cpufreq-dt is probed > successfully, which is incorrect. This issue can happen to any platfo= rm > not using cpufreq-dt in a multi-platform build. >=20 > This patch adds a check to do selective initialization of the driver. >=20 > Cc: Lee Jones > Cc: "Rafael J. Wysocki" > Cc: Viresh Kumar > Cc: linux-pm@vger.kernel.org > Fixes: ab0ea257fc58 ("cpufreq: st: Provide runtime initialised driver= for ST's platforms") > Signed-off-by: Sudeep Holla > --- > drivers/cpufreq/sti-cpufreq.c | 4 ++++ > 1 file changed, 4 insertions(+) >=20 > v1->v2: > - Updated compatible strings as per Lee's confirmation Acked-by: Lee Jones > diff --git a/drivers/cpufreq/sti-cpufreq.c b/drivers/cpufreq/sti-cpuf= req.c > index a9c659f58974..04042038ec4b 100644 > --- a/drivers/cpufreq/sti-cpufreq.c > +++ b/drivers/cpufreq/sti-cpufreq.c > @@ -259,6 +259,10 @@ static int sti_cpufreq_init(void) > { > int ret; >=20 > + if ((!of_machine_is_compatible("st,stih407")) && > + (!of_machine_is_compatible("st,stih410"))) > + return -ENODEV; > + > ddata.cpu =3D get_cpu_device(0); > if (!ddata.cpu) { > dev_err(ddata.cpu, "Failed to get device for CPU0\n"); --=20 Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org =E2=94=82 Open source software for ARM SoCs =46ollow Linaro: Facebook | Twitter | Blog