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Thompson , Mark Brown , Linus Walleij , Barry Song , stephan@gerhold.net, "linux-kernel@vger.kernel.org" , Linux ARM , Daniel Drake , James Cameron Subject: Re: [PATCH v2 0/9] Simplify MFD Core Message-ID: <20191021115339.GF4365@dell> References: <20191021105822.20271-1-lee.jones@linaro.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 21 Oct 2019, Lubomir Rintel wrote: > On Mon, 2019-10-21 at 13:29 +0200, Arnd Bergmann wrote: > > On Mon, Oct 21, 2019 at 12:58 PM Lee Jones wrote: > > > MFD currently has one over-complicated user. CS5535 uses a mixture of > > > cell cloning, reference counting and subsystem-level call-backs to > > > achieve its goal of requesting an IO memory region only once across 3 > > > consumers. The same can be achieved by handling the region centrally > > > during the parent device's .probe() sequence. Releasing can be handed > > > in a similar way during .remove(). > > > > > > While we're here, take the opportunity to provide some clean-ups and > > > error checking to issues noticed along the way. > > > > > > This also paves the way for clean cell disabling via Device Tree being > > > discussed at [0] > > > > > > [0] https://lkml.org/lkml/2019/10/18/612. > > > > As the CS5535 is primarily used on the OLPC XO1, it would be > > good to have someone test the series on such a machine. > > > > I've added a few people to Cc that may be able to help test it, or > > know someone who can. > > > > For the actual patches, see > > https://lore.kernel.org/lkml/20191021105822.20271-1-lee.jones@linaro.org/T/#t > > Thanks for the pointer. I'd by happy to test this. > > Which tree do the patches apply to? > Or, better, is there a tree with the patches applied that I could use? Ideal. Thank you. http://git.linaro.org/people/lee.jones/linux.git/log/?h=topic/mfd-remove-clone-cs5535-mfd > > > Lee Jones (9): > > > mfd: cs5535-mfd: Use PLATFORM_DEVID_* defines and tidy error message > > > mfd: cs5535-mfd: Remove mfd_cell->id hack > > > mfd: cs5535-mfd: Request shared IO regions centrally > > > mfd: cs5535-mfd: Register clients using their own dedicated MFD cell > > > entries > > > mfd: mfd-core: Remove mfd_clone_cell() > > > x86: olpc: Remove invocation of MFD's .enable()/.disable() call-backs > > > mfd: mfd-core: Protect against NULL call-back function pointer > > > mfd: mfd-core: Remove usage counting for .{en,dis}able() call-backs > > > mfd: mfd-core: Move pdev->mfd_cell creation back into mfd_add_device() > > > > > > arch/x86/platform/olpc/olpc-xo1-pm.c | 6 -- > > > drivers/mfd/cs5535-mfd.c | 124 +++++++++++++-------------- > > > drivers/mfd/mfd-core.c | 113 ++++-------------------- > > > include/linux/mfd/core.h | 20 ----- > > > 4 files changed, 79 insertions(+), 184 deletions(-) > > > > -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog