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Wed, 14 Jul 2021 00:49:47 -0700 Received: from MTKMBS31N1.mediatek.inc (172.27.4.69) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Jul 2021 00:49:46 -0700 Received: from MTKCAS36.mediatek.inc (172.27.4.186) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Jul 2021 15:49:39 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS36.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 14 Jul 2021 15:49:39 +0800 Message-ID: <1626248978.8985.4.camel@mhfsdcap03> Subject: Re: [PATCH V3 2/3] dt-bindings: i2c: add attribute default-timing-adjust From: Kewei Xu To: Rob Herring CC: , , , , , , , , , , , , , Date: Wed, 14 Jul 2021 15:49:38 +0800 In-Reply-To: <20210712205342.GA2469648@robh.at.kernel.org> References: <1624271985-23591-1-git-send-email-kewei.xu@mediatek.com> <1624271985-23591-3-git-send-email-kewei.xu@mediatek.com> <20210712205342.GA2469648@robh.at.kernel.org> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: F8EAEF2BEC1C758AA1F1F56F12303E5B8C124DDF5593E1195846295ACC508F7A2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_004954_346252_890DD204 X-CRM114-Status: GOOD ( 20.53 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On Mon, 2021-07-12 at 14:53 -0600, Rob Herring wrote: > On Mon, Jun 21, 2021 at 06:39:44PM +0800, kewei.xu@mediatek.com wrote: > > From: Kewei Xu > > > > Add attribute default-timing-adjust for DT-binding document. > > > > Fixes: be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support") > > You want to fix a kernel change with a DT change? That's not a > compatible change (and I guess neither was the kernel change). Sounds > like the above commit should be reverted and rethink how to add a new > feature... > > > Signed-off-by: Kewei Xu > > --- > > Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt > > index 7c4915bc..7b80a11 100644 > > --- a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt > > +++ b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt > > @@ -33,6 +33,8 @@ Optional properties: > > - mediatek,have-pmic: platform can control i2c form special pmic side. > > Only mt6589 and mt8135 support this feature. > > - mediatek,use-push-pull: IO config use push-pull mode. > > + - mediatek,default-timing-adjust: use default timing calculation, no timing > > + adjustment. > > > > Example: > > > > -- > > 1.9.1 > > > > Hi Rob, In the commit be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support"), the I2C timing calculation has been revised to support ac-timing adjustment.But in our design, it will make tSU,STA/tHD,STA/tSU,STO shorter when the slave device have clock-stretching feature. Then we upload the commit a80f24945fcf ("i2c: mediatek: Use scl_int_delay_ns to compensate clock-stretching") to support adjusting tSU,STA/tHD,STA/tSU,STO when the slave device clock-stretching. But if the slave device stretch the SCL line for too long time, our design still cannot make tSU,STA/tHD,STA/tSU,STO meet spec. However in the old (default) timing algorithm before the commit be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support"), tSU,STA/tHD,STA/tSU,STO can meet spec. So we want to define a new setting "default-adjust-timing" for using the old (default) timing algorithm. thanks kewei _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek 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=-15.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=unavailable 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 9F628C07E9A for ; Wed, 14 Jul 2021 07:51:46 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 436E36101B for ; 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Wed, 14 Jul 2021 00:49:47 -0700 Received: from MTKMBS31N1.mediatek.inc (172.27.4.69) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Jul 2021 00:49:46 -0700 Received: from MTKCAS36.mediatek.inc (172.27.4.186) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Jul 2021 15:49:39 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS36.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 14 Jul 2021 15:49:39 +0800 Message-ID: <1626248978.8985.4.camel@mhfsdcap03> Subject: Re: [PATCH V3 2/3] dt-bindings: i2c: add attribute default-timing-adjust From: Kewei Xu To: Rob Herring CC: , , , , , , , , , , , , , Date: Wed, 14 Jul 2021 15:49:38 +0800 In-Reply-To: <20210712205342.GA2469648@robh.at.kernel.org> References: <1624271985-23591-1-git-send-email-kewei.xu@mediatek.com> <1624271985-23591-3-git-send-email-kewei.xu@mediatek.com> <20210712205342.GA2469648@robh.at.kernel.org> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: F8EAEF2BEC1C758AA1F1F56F12303E5B8C124DDF5593E1195846295ACC508F7A2000:8 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_004954_346252_890DD204 X-CRM114-Status: GOOD ( 20.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 2021-07-12 at 14:53 -0600, Rob Herring wrote: > On Mon, Jun 21, 2021 at 06:39:44PM +0800, kewei.xu@mediatek.com wrote: > > From: Kewei Xu > > > > Add attribute default-timing-adjust for DT-binding document. > > > > Fixes: be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support") > > You want to fix a kernel change with a DT change? That's not a > compatible change (and I guess neither was the kernel change). Sounds > like the above commit should be reverted and rethink how to add a new > feature... > > > Signed-off-by: Kewei Xu > > --- > > Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt | 2 ++ > > 1 file changed, 2 insertions(+) > > > > diff --git a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt > > index 7c4915bc..7b80a11 100644 > > --- a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt > > +++ b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt > > @@ -33,6 +33,8 @@ Optional properties: > > - mediatek,have-pmic: platform can control i2c form special pmic side. > > Only mt6589 and mt8135 support this feature. > > - mediatek,use-push-pull: IO config use push-pull mode. > > + - mediatek,default-timing-adjust: use default timing calculation, no timing > > + adjustment. > > > > Example: > > > > -- > > 1.9.1 > > > > Hi Rob, In the commit be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support"), the I2C timing calculation has been revised to support ac-timing adjustment.But in our design, it will make tSU,STA/tHD,STA/tSU,STO shorter when the slave device have clock-stretching feature. Then we upload the commit a80f24945fcf ("i2c: mediatek: Use scl_int_delay_ns to compensate clock-stretching") to support adjusting tSU,STA/tHD,STA/tSU,STO when the slave device clock-stretching. But if the slave device stretch the SCL line for too long time, our design still cannot make tSU,STA/tHD,STA/tSU,STO meet spec. However in the old (default) timing algorithm before the commit be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support"), tSU,STA/tHD,STA/tSU,STO can meet spec. So we want to define a new setting "default-adjust-timing" for using the old (default) timing algorithm. thanks kewei _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel 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=-17.2 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, URIBL_BLOCKED,USER_AGENT_SANE_2 autolearn=ham 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 54950C07E9A for ; Wed, 14 Jul 2021 07:49:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2CCAA6128B for ; 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Wed, 14 Jul 2021 15:49:45 +0800 Received: from MTKCAS36.mediatek.inc (172.27.4.186) by MTKMBS31N1.mediatek.inc (172.27.4.69) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Jul 2021 15:49:39 +0800 Received: from [10.17.3.153] (10.17.3.153) by MTKCAS36.mediatek.inc (172.27.4.170) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Wed, 14 Jul 2021 15:49:39 +0800 Message-ID: <1626248978.8985.4.camel@mhfsdcap03> Subject: Re: [PATCH V3 2/3] dt-bindings: i2c: add attribute default-timing-adjust From: Kewei Xu To: Rob Herring CC: , , , , , , , , , , , , , Date: Wed, 14 Jul 2021 15:49:38 +0800 In-Reply-To: <20210712205342.GA2469648@robh.at.kernel.org> References: <1624271985-23591-1-git-send-email-kewei.xu@mediatek.com> <1624271985-23591-3-git-send-email-kewei.xu@mediatek.com> <20210712205342.GA2469648@robh.at.kernel.org> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-TM-SNTS-SMTP: F8EAEF2BEC1C758AA1F1F56F12303E5B8C124DDF5593E1195846295ACC508F7A2000:8 X-MTK: N Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org T24gTW9uLCAyMDIxLTA3LTEyIGF0IDE0OjUzIC0wNjAwLCBSb2IgSGVycmluZyB3cm90ZToNCj4g T24gTW9uLCBKdW4gMjEsIDIwMjEgYXQgMDY6Mzk6NDRQTSArMDgwMCwga2V3ZWkueHVAbWVkaWF0 ZWsuY29tIHdyb3RlOg0KPiA+IEZyb206IEtld2VpIFh1IDxrZXdlaS54dUBtZWRpYXRlay5jb20+ DQo+ID4gDQo+ID4gQWRkIGF0dHJpYnV0ZSBkZWZhdWx0LXRpbWluZy1hZGp1c3QgZm9yIERULWJp bmRpbmcgZG9jdW1lbnQuDQo+ID4gDQo+ID4gRml4ZXM6IGJlNWNlMGU5N2NjNyAoImkyYzogbWVk aWF0ZWs6IEFkZCBpMmMgYWMtdGltaW5nIGFkanVzdCBzdXBwb3J0IikNCj4gDQo+IFlvdSB3YW50 IHRvIGZpeCBhIGtlcm5lbCBjaGFuZ2Ugd2l0aCBhIERUIGNoYW5nZT8gVGhhdCdzIG5vdCBhIA0K PiBjb21wYXRpYmxlIGNoYW5nZSAoYW5kIEkgZ3Vlc3MgbmVpdGhlciB3YXMgdGhlIGtlcm5lbCBj aGFuZ2UpLiBTb3VuZHMgDQo+IGxpa2UgdGhlIGFib3ZlIGNvbW1pdCBzaG91bGQgYmUgcmV2ZXJ0 ZWQgYW5kIHJldGhpbmsgaG93IHRvIGFkZCBhIG5ldyANCj4gZmVhdHVyZS4uLg0KPiANCj4gPiBT aWduZWQtb2ZmLWJ5OiBLZXdlaSBYdSA8a2V3ZWkueHVAbWVkaWF0ZWsuY29tPg0KPiA+IC0tLQ0K PiA+ICBEb2N1bWVudGF0aW9uL2RldmljZXRyZWUvYmluZGluZ3MvaTJjL2kyYy1tdDY1eHgudHh0 IHwgMiArKw0KPiA+ICAxIGZpbGUgY2hhbmdlZCwgMiBpbnNlcnRpb25zKCspDQo+ID4gDQo+ID4g ZGlmZiAtLWdpdCBhL0RvY3VtZW50YXRpb24vZGV2aWNldHJlZS9iaW5kaW5ncy9pMmMvaTJjLW10 NjV4eC50eHQgYi9Eb2N1bWVudGF0aW9uL2RldmljZXRyZWUvYmluZGluZ3MvaTJjL2kyYy1tdDY1 eHgudHh0DQo+ID4gaW5kZXggN2M0OTE1YmMuLjdiODBhMTEgMTAwNjQ0DQo+ID4gLS0tIGEvRG9j dW1lbnRhdGlvbi9kZXZpY2V0cmVlL2JpbmRpbmdzL2kyYy9pMmMtbXQ2NXh4LnR4dA0KPiA+ICsr KyBiL0RvY3VtZW50YXRpb24vZGV2aWNldHJlZS9iaW5kaW5ncy9pMmMvaTJjLW10NjV4eC50eHQN Cj4gPiBAQCAtMzMsNiArMzMsOCBAQCBPcHRpb25hbCBwcm9wZXJ0aWVzOg0KPiA+ICAgIC0gbWVk aWF0ZWssaGF2ZS1wbWljOiBwbGF0Zm9ybSBjYW4gY29udHJvbCBpMmMgZm9ybSBzcGVjaWFsIHBt aWMgc2lkZS4NCj4gPiAgICAgIE9ubHkgbXQ2NTg5IGFuZCBtdDgxMzUgc3VwcG9ydCB0aGlzIGZl YXR1cmUuDQo+ID4gICAgLSBtZWRpYXRlayx1c2UtcHVzaC1wdWxsOiBJTyBjb25maWcgdXNlIHB1 c2gtcHVsbCBtb2RlLg0KPiA+ICsgIC0gbWVkaWF0ZWssZGVmYXVsdC10aW1pbmctYWRqdXN0OiB1 c2UgZGVmYXVsdCB0aW1pbmcgY2FsY3VsYXRpb24sIG5vIHRpbWluZw0KPiA+ICsgICAgYWRqdXN0 bWVudC4NCj4gPiAgDQo+ID4gIEV4YW1wbGU6DQo+ID4gIA0KPiA+IC0tIA0KPiA+IDEuOS4xDQo+ ID4gDQo+ID4gDQoNCkhpIFJvYiwNCg0KSW4gdGhlIGNvbW1pdCBiZTVjZTBlOTdjYzcgKCJpMmM6 IG1lZGlhdGVrOiBBZGQgaTJjIGFjLXRpbWluZyBhZGp1c3QNCnN1cHBvcnQiKSwgdGhlIEkyQyB0 aW1pbmcgY2FsY3VsYXRpb24gaGFzIGJlZW4gcmV2aXNlZCB0byBzdXBwb3J0DQphYy10aW1pbmcg YWRqdXN0bWVudC5CdXQgaW4gb3VyIGRlc2lnbiwgaXQgd2lsbCBtYWtlDQp0U1UsU1RBL3RIRCxT VEEvdFNVLFNUTyBzaG9ydGVyIHdoZW4gdGhlIHNsYXZlIGRldmljZSBoYXZlDQpjbG9jay1zdHJl dGNoaW5nIGZlYXR1cmUuDQpUaGVuIHdlIHVwbG9hZCB0aGUgY29tbWl0IGE4MGYyNDk0NWZjZiAo ImkyYzogbWVkaWF0ZWs6IFVzZQ0Kc2NsX2ludF9kZWxheV9ucyB0byBjb21wZW5zYXRlIGNsb2Nr LXN0cmV0Y2hpbmciKSB0byBzdXBwb3J0IGFkanVzdGluZw0KdFNVLFNUQS90SEQsU1RBL3RTVSxT VE8gd2hlbiB0aGUgc2xhdmUgZGV2aWNlIGNsb2NrLXN0cmV0Y2hpbmcuIEJ1dCBpZg0KdGhlIHNs YXZlIGRldmljZSBzdHJldGNoIHRoZSBTQ0wgbGluZSBmb3IgdG9vIGxvbmcgdGltZSwgb3VyIGRl c2lnbg0Kc3RpbGwgY2Fubm90IG1ha2UgdFNVLFNUQS90SEQsU1RBL3RTVSxTVE8gbWVldCBzcGVj Lg0KSG93ZXZlciBpbiB0aGUgb2xkIChkZWZhdWx0KSB0aW1pbmcgYWxnb3JpdGhtIGJlZm9yZSB0 aGUgY29tbWl0DQpiZTVjZTBlOTdjYzcgKCJpMmM6IG1lZGlhdGVrOiBBZGQgaTJjIGFjLXRpbWlu ZyBhZGp1c3Qgc3VwcG9ydCIpLA0KdFNVLFNUQS90SEQsU1RBL3RTVSxTVE8gY2FuIG1lZXQgc3Bl Yy4gU28gd2Ugd2FudCB0byBkZWZpbmUgYSBuZXcNCnNldHRpbmcgImRlZmF1bHQtYWRqdXN0LXRp bWluZyIgZm9yIHVzaW5nIHRoZSBvbGQgKGRlZmF1bHQpIHRpbWluZw0KYWxnb3JpdGhtLg0KDQp0 aGFua3MNCmtld2VpDQo=