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Tue, 23 Jun 2020 23:41:46 -0700 (PDT) Date: Wed, 24 Jun 2020 07:41:45 +0100 From: Lee Jones To: Frank Rowand Subject: Re: [PATCH v2 1/3] mfd: core: Make a best effort attempt to match devices with the correct of_nodes Message-ID: <20200624064145.GC954398@dell> References: <20200611191002.2256570-1-lee.jones@linaro.org> <30f03734-61fd-1b6b-bf11-21b6423a7c50@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <30f03734-61fd-1b6b-bf11-21b6423a7c50@gmail.com> X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: devicetree@vger.kernel.org, gregkh@linuxfoundation.org, broonie@kernel.org, michael@walle.cc, linux-kernel@vger.kernel.org, andy.shevchenko@gmail.com, robh+dt@kernel.org, linux-arm-kernel@lists.infradead.org, andriy.shevchenko@linux.intel.com, robin.murphy@arm.com, linus.walleij@linaro.org, linux@roeck-us.net Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVHVlLCAyMyBKdW4gMjAyMCwgRnJhbmsgUm93YW5kIHdyb3RlOgoKPiBPbiAyMDIwLTA2LTEx IDE0OjEwLCBMZWUgSm9uZXMgd3JvdGU6Cj4gPiBDdXJyZW50bHksIHdoZW4gYSBjaGlsZCBwbGF0 Zm9ybSBkZXZpY2UgKHNvbWV0aW1lcyByZWZlcnJlZCB0byBhcyBhCj4gPiBzdWItZGV2aWNlKSBp cyByZWdpc3RlcmVkIHZpYSB0aGUgTXVsdGktRnVuY3Rpb25hbCBEZXZpY2UgKE1GRCkgQVBJLAo+ ID4gdGhlIGZyYW1ld29yayBhdHRlbXB0cyB0byBtYXRjaCB0aGUgbmV3bHkgcmVnaXN0ZXJlZCBw bGF0Zm9ybSBkZXZpY2UKPiA+IHdpdGggaXRzIGFzc29jaWF0ZWQgRGV2aWNlIFRyZWUgKE9GKSBu b2RlLiAgVW50aWwgbm93LCB0aGUgZGV2aWNlIGhhcwo+ID4gYmVlbiBhbGxvY2F0ZWQgdGhlIGZp cnN0IG5vZGUgZm91bmQgd2l0aCBhbiBpZGVudGljYWwgT0YgY29tcGF0aWJsZQo+ID4gc3RyaW5n LiAgVW5mb3J0dW5hdGVseSwgaWYgdGhlcmUgYXJlLCBzYXkgZm9yIGV4YW1wbGUgJzMnIGRldmlj ZXMKPiA+IHdoaWNoIGFyZSB0byBiZSBoYW5kbGVkIGJ5IHRoZSBzYW1lIGRyaXZlciBhbmQgdGhl cmVmb3JlIGhhdmUgdGhlIHNhbWUKPiA+IGNvbXBhdGlibGUgc3RyaW5nLCBlYWNoIG9mIHRoZW0g d2lsbCBiZSBhbGxvY2F0ZWQgYSBwb2ludGVyIHRvIHRoZQo+ID4gKmZpcnN0KiBub2RlLgo+IAo+ IEFzIHlvdSBtZW50aW9uZWQgZWxzZXdoZXJlIGluIHRoaXMgdGhyZWFkLCB0aGlzIHNlcmllcyAi Zml4ZXMiIHRoZQo+IHByb2JsZW0gcmVsYXRlZCB0byB0aGUgInN0ZXJpY3Nzb24sYWI4NTAwLXB3 bSIgY29tcGF0aWJsZS4KPiAKPiBJIGtub3csIEkgc2FpZCBJIHdvdWxkIGRyb3AgZGlzY3Vzc2lv biBvZiB0aGF0IGNvbXBhdGlibGUsIGJ1dCBiZWFyCj4gd2l0aCBtZSBmb3IgYSBzZWNvbmQuICA6 LSkKPiAKPiBUaGUgInByb2JsZW0iIGlzIHRoYXQgdGhlIGRldmljZXMgZm9yIG11bHRpcGxlIG1m ZCBjaGlsZCBub2RlcyB3aXRoCj4gdGhlIHNhbWUgY29tcGF0aWJsZSB2YWx1ZSBvZiAic3Rlcmlj c3NvbixhYjg1MDAtcHdtIiB3aWxsIGFsbCBoYXZlCj4gYSBwb2ludGVyIHRvIHRoZSBmaXJzdCBj aGlsZCBub2RlLiAgQXQgdGhlIG1vbWVudCB0aGUgc2FtZSBjaGlsZAo+IG9mX25vZGUgYmVpbmcg dXNlZCBieSBtb3JlIHRoYW4gb25lIGRldmljZSBkb2VzIG5vdCBjYXVzZSBhbnkKPiBpbmNvcnJl Y3QgYmVoYXZpb3IuCj4gCj4gSnVzdCBpbiBjYXNlIHRoZSBkcml2ZXIgZm9yICJzdGVyaWNzc29u LGFiODUwMC1wd20iIGlzIG1vZGlmaWVkCj4gaW4gYSB3YXkgdGhhdCB0aGUgY2hpbGQgb2Zfbm9k ZSBuZWVkcyB0byBiZSBkaXN0aW5jdCBmb3IgZWFjaAo+IGRldmljZSwgYW5kIHRoYXQgY2hhbmdl cyBnZXRzIGJhY2sgcG9ydGVkLCBpdCB3b3VsZCBiZSB1c2VmdWwKPiB0byBoYXZlIEZpeGVzOiB0 YWdzIGZvciB0aGlzIHBhdGNoIHNlcmllcy4KPiAKPiBTbywgYXQgeW91ciBkaXNjcmV0aW9uIChh bmQgSSdsbCBsZXQgeW91IHdvcnJ5IGFib3V0IHRoZSBjb3JyZWN0Cj4gRml4ZXM6IHRhZyBmb3Jt YXQpLCB0aGlzIHNlcmllcyBmaXhlczoKPiAKPiBiYWQ3Njk5MWQ3ODQ3Yjc4NzdhZTc5N2NjNzk3 NDVkODJmZmQ5MTIwIG1mZDogUmVnaXN0ZXIgYWI4NTAwIGRldmljZXMgdXNpbmcgdGhlIG5ld2x5 IERUOmVkIE1GRCBBUEkKClRoaXMgcGF0Y2ggaXNuJ3QgYWN0dWFsbHkgYnJva2VuLgoKVGhlIGlz c3VlIGlzIHRoZSBEVEIsIHdoaWNoIFswXSBhZGRyZXNzZXMuCgpbMF0KaHR0cHM6Ly9sa21sLmtl cm5lbC5vcmcvbGttbC8yMDIwMDYyMjA4MzQzMi4xNDkxNzE1LTEtbGVlLmpvbmVzQGxpbmFyby5v cmcvCgo+IGM5NGJiMjMzYTlmZWUzMzE0ZGM1ZDljN2RlOWZhNzAyZTkxMjgzZjIgbWZkOiBNYWtl IE1GRCBjb3JlIGNvZGUgRGV2aWNlIFRyZWUgYW5kIElSUSBkb21haW4gYXdhcmUKCkl0IHNvdW5k cyByZWFzb25hYmxlIHRvIGxpc3QgdGhpcyBvbmUsIHRoYW5rcy4KCi0tIApMZWUgSm9uZXMgW+ad jueQvOaWr10KU2VuaW9yIFRlY2huaWNhbCBMZWFkIC0gRGV2ZWxvcGVyIFNlcnZpY2VzCkxpbmFy by5vcmcg4pSCIE9wZW4gc291cmNlIHNvZnR3YXJlIGZvciBBcm0gU29DcwpGb2xsb3cgTGluYXJv OiBGYWNlYm9vayB8IFR3aXR0ZXIgfCBCbG9nCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1h cm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcv bWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg== From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 75468C433E0 for ; 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Tue, 23 Jun 2020 23:41:47 -0700 (PDT) Received: from dell ([2.27.35.144]) by smtp.gmail.com with ESMTPSA id b18sm25196379wrn.88.2020.06.23.23.41.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Jun 2020 23:41:46 -0700 (PDT) Date: Wed, 24 Jun 2020 07:41:45 +0100 From: Lee Jones To: Frank Rowand Cc: andy.shevchenko@gmail.com, michael@walle.cc, robh+dt@kernel.org, broonie@kernel.org, devicetree@vger.kernel.org, linus.walleij@linaro.org, linux@roeck-us.net, andriy.shevchenko@linux.intel.com, robin.murphy@arm.com, gregkh@linuxfoundation.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 1/3] mfd: core: Make a best effort attempt to match devices with the correct of_nodes Message-ID: <20200624064145.GC954398@dell> References: <20200611191002.2256570-1-lee.jones@linaro.org> <30f03734-61fd-1b6b-bf11-21b6423a7c50@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <30f03734-61fd-1b6b-bf11-21b6423a7c50@gmail.com> Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org On Tue, 23 Jun 2020, Frank Rowand wrote: > On 2020-06-11 14:10, Lee Jones wrote: > > Currently, when a child platform device (sometimes referred to as a > > sub-device) is registered via the Multi-Functional Device (MFD) API, > > the framework attempts to match the newly registered platform device > > with its associated Device Tree (OF) node. Until now, the device has > > been allocated the first node found with an identical OF compatible > > string. Unfortunately, if there are, say for example '3' devices > > which are to be handled by the same driver and therefore have the same > > compatible string, each of them will be allocated a pointer to the > > *first* node. > > As you mentioned elsewhere in this thread, this series "fixes" the > problem related to the "stericsson,ab8500-pwm" compatible. > > I know, I said I would drop discussion of that compatible, but bear > with me for a second. :-) > > The "problem" is that the devices for multiple mfd child nodes with > the same compatible value of "stericsson,ab8500-pwm" will all have > a pointer to the first child node. At the moment the same child > of_node being used by more than one device does not cause any > incorrect behavior. > > Just in case the driver for "stericsson,ab8500-pwm" is modified > in a way that the child of_node needs to be distinct for each > device, and that changes gets back ported, it would be useful > to have Fixes: tags for this patch series. > > So, at your discretion (and I'll let you worry about the correct > Fixes: tag format), this series fixes: > > bad76991d7847b7877ae797cc79745d82ffd9120 mfd: Register ab8500 devices using the newly DT:ed MFD API This patch isn't actually broken. The issue is the DTB, which [0] addresses. [0] https://lkml.kernel.org/lkml/20200622083432.1491715-1-lee.jones@linaro.org/ > c94bb233a9fee3314dc5d9c7de9fa702e91283f2 mfd: Make MFD core code Device Tree and IRQ domain aware It sounds reasonable to list this one, thanks. -- Lee Jones [李琼斯] Senior Technical Lead - Developer Services Linaro.org │ Open source software for Arm SoCs Follow Linaro: Facebook | Twitter | Blog