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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id F0DF0C4708E for ; Tue, 6 Dec 2022 12:20:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=CMme1AvazOP/i2nnbk3Uh+9ByR3nyfXtTblTJYljqTk=; b=nRHkyTH+AeZ5ue7yAbHD5Yg8oL cUYS+UtfmU+bxsff9cOsp7WHKQzb5ylM8laqmk7lZOKQ7Gac7OHH7zX2+fZgHPiSvFSOmFaYFWT+A 3DDhB98kI9uC7J36J7ksG5sLWHd5pQobBYJKTpmwj+YYHM5OXHJjzPTSynGYTIxDmgc35E1lC3D9S hLbgEPN24FUnrR6UR5PQbctTBDIqr8iPEvTVo24VGGmpKjJ+jbgldtUoqtHe1EaLVbdtyqjJ3wG8l 8b10Z6L+DCr9XkYWiLTQACNx7c5CdT5CAWp+8zdEecA1C5/HdYtyz1dUOygrXVucFivWZXgiRHPqt zWJPAvXg==; 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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: [PATCH v2 7/9] dt-bindings: spi: mtk-snfi: Add read latch latency property Content-Language: en-US To: =?UTF-8?B?WGlhbmdzaGVuZyBIb3UgKOS+r+elpeiDnCk=?= , "miquel.raynal@bootlin.com" , "robh+dt@kernel.org" , "broonie@kernel.org" , "krzysztof.kozlowski+dt@linaro.org" , "matthias.bgg@gmail.com" , "gch981213@gmail.com" , "vigneshr@ti.com" , "richard@nod.at" Cc: "linux-kernel@vger.kernel.org" , "linux-mediatek@lists.infradead.org" , "linux-mtd@lists.infradead.org" , "devicetree@vger.kernel.org" , =?UTF-8?B?QmVubGlhbmcgWmhhbyAo6LW15pys5LquKQ==?= , "linux-spi@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , =?UTF-8?B?QmluIFpoYW5nICjnq6Dmlowp?= References: <20221205065756.26875-1-xiangsheng.hou@mediatek.com> <20221205065756.26875-8-xiangsheng.hou@mediatek.com> From: AngeloGioacchino Del Regno In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221206_041956_673500_0A29F970 X-CRM114-Status: GOOD ( 14.25 ) 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: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org Il 06/12/22 10:04, Xiangsheng Hou (侯祥胜) ha scritto: > Hi Angelo, > > On Mon, 2022-12-05 at 15:21 +0100, AngeloGioacchino Del Regno wrote: >> Il 05/12/22 07:57, Xiangsheng Hou ha scritto: >>> Add mediatek,rx-latch-latency property which adjust read delay in >>> the >>> unit of clock cycle. >>> >>> Signed-off-by: Xiangsheng Hou >>> Acked-by: Krzysztof Kozlowski >>> --- >>> .../devicetree/bindings/spi/mediatek,spi-mtk-snfi.yaml | 7 >>> +++++++ >>> 1 file changed, 7 insertions(+) >>> >>> diff --git a/Documentation/devicetree/bindings/spi/mediatek,spi- >>> mtk-snfi.yaml b/Documentation/devicetree/bindings/spi/mediatek,spi- >>> mtk-snfi.yaml >>> index bab23f1b11fd..6e6ff8d73fcd 100644 >>> --- a/Documentation/devicetree/bindings/spi/mediatek,spi-mtk- >>> snfi.yaml >>> +++ b/Documentation/devicetree/bindings/spi/mediatek,spi-mtk- >>> snfi.yaml >>> @@ -45,6 +45,13 @@ properties: >>> description: device-tree node of the accompanying ECC engine. >>> $ref: /schemas/types.yaml#/definitions/phandle >>> >>> + mediatek,rx-latch-latency: >>> + description: Rx delay to sample data with this value, the >>> value >>> + unit is clock cycle. >> >> Can't we use nanoseconds or microseconds as a unit here, instead of >> clock cycles? > > The clock cycle will be various with MediaTek SPI NAND controller which > clock frequency can support 26/52/68/81/104MHz... > It`s may be easy to configure and understand with clock cycle in unit. > Yes, but whatever clock frequency we use, the target is to always wait for X nanoseconds, right? Waiting for 5 clock cycles at 104MHz is obviously not the same as waiting for the same 5 clock cycles at 26MHz: in that case, expressing the value in nanoseconds or microseconds would make that independent from the controller's clock frequency as the calculation from `time` to `cycles` would be performed inside of the driver. Regards, Angelo 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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 24B28C352A1 for ; Tue, 6 Dec 2022 12:20:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: Content-Transfer-Encoding:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To:Subject: MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=dHAHbCBI86PMc17JUZvtzE99O1D/8N+mrj3XAWEd7zw=; b=qrQdhFWWweE3pk miVDXwPhjDm3DHy2QVvQNVJE/nepheUwmzLkUjA+9bVjfTBjj77oX7JXuqhUkNMu3VJU1ojrRKCzV 6OeWSJ56Hrvo/C0Fr0LCyECOSwWdDWcMpW+LtYxmIRALzMA/8NNHxSuiU+USv8K1abm2SwzMvXd/T QZUBV+JDlCOSmeeoSmsrSUXQkYkRurrG5zTLSTQbluhGHCrZ1jV05p6qB9vnATL9aIboO3ay1xpPp 6oaq6BjIY7C8XGCIBxowJRPTV25QcTNimRLDTRR/z/ggeFnmnyFDKUYZqcF6BuYJEX2OMv3cOJK87 wiI+RoG5AaG3IbUNEO3Q==; 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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: [PATCH v2 7/9] dt-bindings: spi: mtk-snfi: Add read latch latency property Content-Language: en-US To: =?UTF-8?B?WGlhbmdzaGVuZyBIb3UgKOS+r+elpeiDnCk=?= , "miquel.raynal@bootlin.com" , "robh+dt@kernel.org" , "broonie@kernel.org" , "krzysztof.kozlowski+dt@linaro.org" , "matthias.bgg@gmail.com" , "gch981213@gmail.com" , "vigneshr@ti.com" , "richard@nod.at" Cc: "linux-kernel@vger.kernel.org" , "linux-mediatek@lists.infradead.org" , "linux-mtd@lists.infradead.org" , "devicetree@vger.kernel.org" , =?UTF-8?B?QmVubGlhbmcgWmhhbyAo6LW15pys5LquKQ==?= , "linux-spi@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , =?UTF-8?B?QmluIFpoYW5nICjnq6Dmlowp?= References: <20221205065756.26875-1-xiangsheng.hou@mediatek.com> <20221205065756.26875-8-xiangsheng.hou@mediatek.com> From: AngeloGioacchino Del Regno In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221206_041956_673500_0A29F970 X-CRM114-Status: GOOD ( 14.25 ) X-BeenThere: linux-mtd@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Linux MTD discussion mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; 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Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.5.0 Subject: Re: [PATCH v2 7/9] dt-bindings: spi: mtk-snfi: Add read latch latency property Content-Language: en-US To: =?UTF-8?B?WGlhbmdzaGVuZyBIb3UgKOS+r+elpeiDnCk=?= , "miquel.raynal@bootlin.com" , "robh+dt@kernel.org" , "broonie@kernel.org" , "krzysztof.kozlowski+dt@linaro.org" , "matthias.bgg@gmail.com" , "gch981213@gmail.com" , "vigneshr@ti.com" , "richard@nod.at" Cc: "linux-kernel@vger.kernel.org" , "linux-mediatek@lists.infradead.org" , "linux-mtd@lists.infradead.org" , "devicetree@vger.kernel.org" , =?UTF-8?B?QmVubGlhbmcgWmhhbyAo6LW15pys5LquKQ==?= , "linux-spi@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , =?UTF-8?B?QmluIFpoYW5nICjnq6Dmlowp?= References: <20221205065756.26875-1-xiangsheng.hou@mediatek.com> <20221205065756.26875-8-xiangsheng.hou@mediatek.com> From: AngeloGioacchino Del Regno In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221206_041956_673500_0A29F970 X-CRM114-Status: GOOD ( 14.25 ) 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-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org SWwgMDYvMTIvMjIgMTA6MDQsIFhpYW5nc2hlbmcgSG91ICjkvq/npaXog5wpIGhhIHNjcml0dG86 Cj4gSGkgQW5nZWxvLAo+IAo+IE9uIE1vbiwgMjAyMi0xMi0wNSBhdCAxNToyMSArMDEwMCwgQW5n ZWxvR2lvYWNjaGlubyBEZWwgUmVnbm8gd3JvdGU6Cj4+IElsIDA1LzEyLzIyIDA3OjU3LCBYaWFu Z3NoZW5nIEhvdSBoYSBzY3JpdHRvOgo+Pj4gQWRkIG1lZGlhdGVrLHJ4LWxhdGNoLWxhdGVuY3kg cHJvcGVydHkgd2hpY2ggYWRqdXN0IHJlYWQgZGVsYXkgaW4KPj4+IHRoZQo+Pj4gdW5pdCBvZiBj bG9jayBjeWNsZS4KPj4+Cj4+PiBTaWduZWQtb2ZmLWJ5OiBYaWFuZ3NoZW5nIEhvdSA8eGlhbmdz aGVuZy5ob3VAbWVkaWF0ZWsuY29tPgo+Pj4gQWNrZWQtYnk6IEtyenlzenRvZiBLb3psb3dza2kg PGtyenlzenRvZi5rb3psb3dza2lAbGluYXJvLm9yZz4KPj4+IC0tLQo+Pj4gICAgLi4uL2Rldmlj ZXRyZWUvYmluZGluZ3Mvc3BpL21lZGlhdGVrLHNwaS1tdGstc25maS55YW1sICAgICB8IDcKPj4+ ICsrKysrKysKPj4+ICAgIDEgZmlsZSBjaGFuZ2VkLCA3IGluc2VydGlvbnMoKykKPj4+Cj4+PiBk aWZmIC0tZ2l0IGEvRG9jdW1lbnRhdGlvbi9kZXZpY2V0cmVlL2JpbmRpbmdzL3NwaS9tZWRpYXRl ayxzcGktCj4+PiBtdGstc25maS55YW1sIGIvRG9jdW1lbnRhdGlvbi9kZXZpY2V0cmVlL2JpbmRp bmdzL3NwaS9tZWRpYXRlayxzcGktCj4+PiBtdGstc25maS55YW1sCj4+PiBpbmRleCBiYWIyM2Yx YjExZmQuLjZlNmZmOGQ3M2ZjZCAxMDA2NDQKPj4+IC0tLSBhL0RvY3VtZW50YXRpb24vZGV2aWNl dHJlZS9iaW5kaW5ncy9zcGkvbWVkaWF0ZWssc3BpLW10ay0KPj4+IHNuZmkueWFtbAo+Pj4gKysr IGIvRG9jdW1lbnRhdGlvbi9kZXZpY2V0cmVlL2JpbmRpbmdzL3NwaS9tZWRpYXRlayxzcGktbXRr LQo+Pj4gc25maS55YW1sCj4+PiBAQCAtNDUsNiArNDUsMTMgQEAgcHJvcGVydGllczoKPj4+ICAg ICAgICBkZXNjcmlwdGlvbjogZGV2aWNlLXRyZWUgbm9kZSBvZiB0aGUgYWNjb21wYW55aW5nIEVD QyBlbmdpbmUuCj4+PiAgICAgICAgJHJlZjogL3NjaGVtYXMvdHlwZXMueWFtbCMvZGVmaW5pdGlv bnMvcGhhbmRsZQo+Pj4gICAgCj4+PiArICBtZWRpYXRlayxyeC1sYXRjaC1sYXRlbmN5Ogo+Pj4g KyAgICBkZXNjcmlwdGlvbjogUnggZGVsYXkgdG8gc2FtcGxlIGRhdGEgd2l0aCB0aGlzIHZhbHVl LCB0aGUKPj4+IHZhbHVlCj4+PiArICAgICAgICAgICAgICAgICB1bml0IGlzIGNsb2NrIGN5Y2xl Lgo+Pgo+PiBDYW4ndCB3ZSB1c2UgbmFub3NlY29uZHMgb3IgbWljcm9zZWNvbmRzIGFzIGEgdW5p dCBoZXJlLCBpbnN0ZWFkIG9mCj4+IGNsb2NrIGN5Y2xlcz8KPiAKPiBUaGUgY2xvY2sgY3ljbGUg d2lsbCBiZSB2YXJpb3VzIHdpdGggTWVkaWFUZWsgU1BJIE5BTkQgY29udHJvbGxlciB3aGljaAo+ IGNsb2NrIGZyZXF1ZW5jeSBjYW4gc3VwcG9ydCAyNi81Mi82OC84MS8xMDRNSHouLi4KPiBJdGBz IG1heSBiZSBlYXN5IHRvIGNvbmZpZ3VyZSBhbmQgdW5kZXJzdGFuZCB3aXRoIGNsb2NrIGN5Y2xl IGluIHVuaXQuCj4gCgpZZXMsIGJ1dCB3aGF0ZXZlciBjbG9jayBmcmVxdWVuY3kgd2UgdXNlLCB0 aGUgdGFyZ2V0IGlzIHRvIGFsd2F5cyB3YWl0IGZvcgpYIG5hbm9zZWNvbmRzLCByaWdodD8KCldh aXRpbmcgZm9yIDUgY2xvY2sgY3ljbGVzIGF0IDEwNE1IeiBpcyBvYnZpb3VzbHkgbm90IHRoZSBz YW1lIGFzIHdhaXRpbmcKZm9yIHRoZSBzYW1lIDUgY2xvY2sgY3ljbGVzIGF0IDI2TUh6OiBpbiB0 aGF0IGNhc2UsIGV4cHJlc3NpbmcgdGhlIHZhbHVlCmluIG5hbm9zZWNvbmRzIG9yIG1pY3Jvc2Vj b25kcyB3b3VsZCBtYWtlIHRoYXQgaW5kZXBlbmRlbnQgZnJvbSB0aGUKY29udHJvbGxlcidzIGNs b2NrIGZyZXF1ZW5jeSBhcyB0aGUgY2FsY3VsYXRpb24gZnJvbSBgdGltZWAgdG8gYGN5Y2xlc2AK d291bGQgYmUgcGVyZm9ybWVkIGluc2lkZSBvZiB0aGUgZHJpdmVyLgoKUmVnYXJkcywKQW5nZWxv CgoKX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgt YXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QKbGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQu b3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJt LWtlcm5lbAo=