On Mon, 01 Sep 2014, Arnd Bergmann wrote: > On Monday 01 September 2014 08:49:18 Lee Jones wrote: > > On Fri, 22 Aug 2014, Pankaj Dubey wrote: > > > > > From: Tomasz Figa <t.figa@xxxxxxxxxxx> > > > > > > Currently a syscon entity can be only registered directly through a > > > platform device that binds to a dedicated driver. However in certain use > > > cases it is desirable to make a device used with another driver a syscon > > > interface provider. For example, certain SoCs (e.g. Exynos) contain > > > system controller blocks which perform various functions such as power > > > domain control, CPU power management, low power mode control, but in > > > addition contain certain IP integration glue, such as various signal > > > masks, coprocessor power control, etc. In such case, there is a need to > > > have a dedicated driver for such system controller but also share > > > registers with other drivers. The latter is where the syscon interface > > > is helpful. > > > > > > This patch decouples syscon object from syscon driver, so that it can be > > > registered from any driver in addition to the original "syscon" platform > > > driver. > > > > > > Signed-off-by: Tomasz Figa <t.figa@xxxxxxxxxxx> > > > Signed-off-by: Pankaj Dubey <pankaj.dubey@xxxxxxxxxxx> > > > --- > > > > > > RFC patch [1] was posted by Tomasz Figa. This patch addresses some of > > > comments given by Arnd to RFC patch, and further decouples syscon from > > > device model. It also gives flexibility of registering with syscon at > > > early stage using device_node object. > > > > It would be helpful if Arnd gave this revision his blessing (Ack). > > I never saw a reason why we don't take this all the way as discussed > a few times: Completely remove the dependency of syscon on having > a platform driver for it, and make it possible to just call > syscon_regmap_lookup_by_phandle() without having to register > it first. I think this sounds like a good end-state. Migrating over by supporting both methods in this way does sound like the correct thing to do though. Doing so is likely to dramatically reduce the effect on current users. -- Lee Jones Linaro STMicroelectronics Landing Team Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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