regmap updates in 3.3
After the rush of new features in version 3.2 this has been a fairly quiet cycle for the regmap API, the main change being the wider usage by drivers. In terms of development of the subsystem itself...
View Articleregulator updates in 3.3
Linux 3.3 was released today. This was the biggest release for the regulator API for quite some time thanks to the contribution of device tree bindings for the API by Rajendra Nayak, the first...
View ArticleASoC updates in 3.4
Linux version 3.4 has been released. This was a very active release for ASoC in framework terms, in addition to the usual bug fixes and so on there were a large number of framework enhancements though...
View Articleregmap updates in 3.4
Things are really quieting down with the regmap API, while we’re still seeing a trickle of new features coming in they’re getting much smaller than they were. Support for padding between the register...
View Articleregulator updates in 3.4
This has been a fairly quiet release from a regulator point of view, the only real framework features added were devm support and a convenience helper for setting up fixed voltage regulators. Much more...
View ArticleRegulator updates in 3.5
There’s been a bit of an increase in the amount of core work in version 3.5, regmap has enabled a lot of code to be factored out of drivers and into the core so drivers only need to provide data. This...
View ArticleASoC updates in 3.5
The big news for ASoC in 3.5 is the first two changes here which are pretty major features for the subsystem: Dynamic PCM support, allowing support for SoCs with internal routing through components...
View ArticleSpeaking at ELC-E: “regmap: The Power of Subsystems and Abstractions”
I will be speaking at ELC-E in Barcelona this year, with a talk entitled regmap: The Power of Subsystems and Abstractions. I look forward to seeing some of you at the conference, perhaps even in the...
View ArticleASoC updates in 3.6
Linux v3.6 was another quiet release for ASoC with just a single notable framework feature being merged: Added the ability to add and remove DAPM paths dynamically, mostly for reparenting on clock...
View ArticleNew job
A few months ago I started a new job at Linaro as the technical lead for the Linaro Stable Kernel – I just posted a brief thing what I’m up to now over on the Linaro blog.
View ArticleKernel build times for automated builders
Over the past year or so various people have been automating kernel builds with the aim of both setting the standard that things should build reliably and using the resulting builds for automated...
View ArticleMaximising the efficiency of chained regulators
Linux v4.4 will include a cool new feature contributed by Sascha Hauer of Pengutronix which propagates voltages set on a regulator to the regulators that supply it (taking into account the minimum...
View ArticleMaintaining your email
One of the difficulties of being a kernel maintainer for a busy subsystem is that you will often end up getting a lot of mail that requires reading and handling which in turn requires sending a lot of...
View ArticlePerformance problems
Just over a year ago I implemented an optimization to the SPI core code in Linux that avoids some needless context switches to a worker thread in the main data path that most clients use. This was...
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OpenTAC sprint
This weekend Toby Churchill kindly hosted a hacking weekend for OpenTAC – myself, Michael Grzeschik, Steve McIntyre and Andy Simpkins got together to bring up the remaining bits of the hardware on the...
View ArticleWe show up
It’s really common for pitches to managements within companies about Linux kernel upstreaming to focus on cost savings to vendors from getting their code into the kernel, especially in the embedded...
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