From mboxrd@z Thu Jan 1 00:00:00 1970 From: shawn.guo@linaro.org (Shawn Guo) Date: Sat, 28 Jun 2014 22:52:54 +0800 Subject: [PATCH 2/2] cpufreq: cpu0: Extend support beyond CPU0 In-Reply-To: References: Message-ID: <20140628145253.GB7869@dragon> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wed, Jun 25, 2014 at 02:12:29PM +0530, Viresh Kumar wrote: > cpufreq-cpu0 driver supports only platforms which have single clock line shared > among all CPUs. > > We already have platforms where this limitation doesn't hold true.For example on > Qualcomm's KRAIT all CPUs have separate clock line and so have separate > policies. > > Instead of adding another driver for this (Stephen just tried that: > https://lkml.org/lkml/2014/6/24/918), we must reuse cpufreq-cpu0 driver. > > cpufreq-cpu0 must be updated to break the assumption on which it is based (all > cores sharing clock line) and this patch tries to do exactly that. > > As we don't have standard DT bindings to mention CPUs sharing clock-line, i.e. > affected_cpus, this patch also have few limitations. Though easy to fix once we > have proper bindings. > > Limitation: We only supports two types of platforms: > - All CPUs sharing same clock line, existing user platforms > - All CPUs have separate clock lines, KRAIT > > And so platforms which have multiple clusters with multiple CPUs per cluster > aren't supported yet. We need proper bindings for that first. > > Signed-off-by: Viresh Kumar > --- > .../devicetree/bindings/cpufreq/cpufreq-cpu0.txt | 8 +- > drivers/cpufreq/Kconfig | 5 +- > drivers/cpufreq/cpufreq-cpu0.c | 280 +++++++++++++-------- > 3 files changed, 190 insertions(+), 103 deletions(-) Hi Viresh, Thanks for all the effort on maintaining and improving cpufreq-cpu0 driver. Your patch rewrote the most part of the driver, so I'd like to hand over the driver to you. Please add yourself as the primary person for MODULE_AUTHOR. Shawn