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Thu, 21 Jan 2021 01:57:32 -0800 Envelope-to: michal.simek@xilinx.com, soc@kernel.org, olof@lixom.net, arnd@arndb.de, robh+dt@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, michael@walle.cc Received: from [172.30.17.109] (port=44700) by smtp.xilinx.com with esmtp (Exim 4.90) (envelope-from ) id 1l2WiZ-00069C-Rh; Thu, 21 Jan 2021 01:57:32 -0800 To: Michael Walle , Michal Simek List-Id: CC: , , , Rob Herring , "Arnd Bergmann" , Olof Johansson , References: <20210120194033.26970-1-michael@walle.cc> From: Michal Simek Subject: Re: [PATCH 0/3] add Ebang EBAZ4205 support Message-ID: <0a1c6ebf-1d5b-4f06-56db-f04e87d2ae9a@xilinx.com> Date: Thu, 21 Jan 2021 10:57:28 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.6.1 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 8bit X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 2908f50d-fc97-4138-16a0-08d8bdf2f98c X-MS-TrafficTypeDiagnostic: DM5PR02MB3846: X-Microsoft-Antispam-PRVS: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-Oob-TLC-OOBClassifiers: OLM:9508; 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X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 21 Jan 2021 09:57:33.7948 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 2908f50d-fc97-4138-16a0-08d8bdf2f98c X-MS-Exchange-CrossTenant-Id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=657af505-d5df-48d0-8300-c31994686c5c;Ip=[149.199.62.198];Helo=[xsj-pvapexch01.xlnx.xilinx.com] X-MS-Exchange-CrossTenant-AuthSource: BL2NAM02FT031.eop-nam02.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR02MB3846 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, On 1/21/21 10:35 AM, Michael Walle wrote: > Hi Michal, > > Am 2021-01-21 10:25, schrieb Michal Simek: >> On 1/20/21 8:40 PM, Michael Walle wrote: >>> Add support for the Ebang EBAZ4205 board. This board was once used as a >>> control board for a bitcoin mining device. Nowawdays it is sold as a >>> cheap >>> Zynq-7000 eval board. >>> >>> Michael Walle (3): >>>   dt-bindings: add ebang vendor prefix >>>   dt-bindings: arm: add Ebang EBAZ4205 board >>>   ARM: dts: add Ebang EBAZ4205 device tree >>> >>>  .../devicetree/bindings/arm/xilinx.yaml       |   1 + >>>  .../devicetree/bindings/vendor-prefixes.yaml  |   2 + >>>  arch/arm/boot/dts/Makefile                    |   1 + >>>  arch/arm/boot/dts/zynq-ebaz4205.dts           | 109 ++++++++++++++++++ >>>  4 files changed, 113 insertions(+) >>>  create mode 100644 arch/arm/boot/dts/zynq-ebaz4205.dts >>> >> >> any link with schematics? > > https://github.com/xjtuecho/EBAZ4205, looks like these are > reverse engineered (from a layout file?) though. Interesting but at least something. > >> I will let dt guys to comment 1/3 but series look good to me. >> The board doesn't look interesting from description point of view that's >> why all the time thinking if makes sense to add it to kernel. > > What do you want to tell me? That for the time being, it didn't > appear to you to add the board yourself - or do you thing it > doesn't make sense at all. If its the latter, what would be > actual reason to have a board in mainline? I have bad experience with for example Avnet boards which people add and none is really updating them and they are in the same state for years. Long time ago we agreed that doesn't make sense to describe PL in upstream projects and we only describe PS part. It means you likely miss several things which are useful and the reason for using these SoCs is PL. As you likely know Xilinx has Versal device and I didn't push any device tree to any upstream project and thinking not to add any description for boards and stay in sort of space that "virtual" description for SoC should be enough. Maybe just versal.dtsi and one kitchen sink DT should be added but not description for all boards. The same is if make sense to push all DTs for all standard xilinx zynqmp evaluation boards. If there is something interesting/new I thought it makes sense to add it as pattern to follow. But for boards which looks very similar from PS point of view I don't think there is real value to add and invest time for maintaining. Back to your case. Board is cheap which is not all the time case for any xilinx board but you have only uart, sd and partially described ethernet which doesn't work without PL. Is it worth to have this described? Especially when it is visible that you need to describe custom PL and DT overlays are not solid yet. Thanks, Michal 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=-10.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_SANE_1 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 47101C433DB for ; Thu, 21 Jan 2021 09:59:27 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (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 BDAFA20725 for ; Thu, 21 Jan 2021 09:59:26 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org BDAFA20725 Authentication-Results: mail.kernel.org; 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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 Message-ID: <20210121095728.WYWMvGtDjaW2CtN-xJ2lfY1FjAEUAaA4cBS637MbF_M@z> SGksCgpPbiAxLzIxLzIxIDEwOjM1IEFNLCBNaWNoYWVsIFdhbGxlIHdyb3RlOgo+IEhpIE1pY2hh bCwKPiAKPiBBbSAyMDIxLTAxLTIxIDEwOjI1LCBzY2hyaWViIE1pY2hhbCBTaW1lazoKPj4gT24g MS8yMC8yMSA4OjQwIFBNLCBNaWNoYWVsIFdhbGxlIHdyb3RlOgo+Pj4gQWRkIHN1cHBvcnQgZm9y IHRoZSBFYmFuZyBFQkFaNDIwNSBib2FyZC4gVGhpcyBib2FyZCB3YXMgb25jZSB1c2VkIGFzIGEK Pj4+IGNvbnRyb2wgYm9hcmQgZm9yIGEgYml0Y29pbiBtaW5pbmcgZGV2aWNlLiBOb3dhd2RheXMg aXQgaXMgc29sZCBhcyBhCj4+PiBjaGVhcAo+Pj4gWnlucS03MDAwIGV2YWwgYm9hcmQuCj4+Pgo+ Pj4gTWljaGFlbCBXYWxsZSAoMyk6Cj4+PiDCoCBkdC1iaW5kaW5nczogYWRkIGViYW5nIHZlbmRv ciBwcmVmaXgKPj4+IMKgIGR0LWJpbmRpbmdzOiBhcm06IGFkZCBFYmFuZyBFQkFaNDIwNSBib2Fy ZAo+Pj4gwqAgQVJNOiBkdHM6IGFkZCBFYmFuZyBFQkFaNDIwNSBkZXZpY2UgdHJlZQo+Pj4KPj4+ IMKgLi4uL2RldmljZXRyZWUvYmluZGluZ3MvYXJtL3hpbGlueC55YW1swqDCoMKgwqDCoMKgIHzC oMKgIDEgKwo+Pj4gwqAuLi4vZGV2aWNldHJlZS9iaW5kaW5ncy92ZW5kb3ItcHJlZml4ZXMueWFt bMKgIHzCoMKgIDIgKwo+Pj4gwqBhcmNoL2FybS9ib290L2R0cy9NYWtlZmlsZcKgwqDCoMKgwqDC oMKgwqDCoMKgwqDCoMKgwqDCoMKgwqDCoMKgIHzCoMKgIDEgKwo+Pj4gwqBhcmNoL2FybS9ib290 L2R0cy96eW5xLWViYXo0MjA1LmR0c8KgwqDCoMKgwqDCoMKgwqDCoMKgIHwgMTA5ICsrKysrKysr KysrKysrKysrKwo+Pj4gwqA0IGZpbGVzIGNoYW5nZWQsIDExMyBpbnNlcnRpb25zKCspCj4+PiDC oGNyZWF0ZSBtb2RlIDEwMDY0NCBhcmNoL2FybS9ib290L2R0cy96eW5xLWViYXo0MjA1LmR0cwo+ Pj4KPj4KPj4gYW55IGxpbmsgd2l0aCBzY2hlbWF0aWNzPwo+IAo+IGh0dHBzOi8vZ2l0aHViLmNv bS94anR1ZWNoby9FQkFaNDIwNSwgbG9va3MgbGlrZSB0aGVzZSBhcmUKPiByZXZlcnNlIGVuZ2lu ZWVyZWQgKGZyb20gYSBsYXlvdXQgZmlsZT8pIHRob3VnaC4KCkludGVyZXN0aW5nIGJ1dCBhdCBs ZWFzdCBzb21ldGhpbmcuCgo+IAo+PiBJIHdpbGwgbGV0IGR0IGd1eXMgdG8gY29tbWVudCAxLzMg YnV0IHNlcmllcyBsb29rIGdvb2QgdG8gbWUuCj4+IFRoZSBib2FyZCBkb2Vzbid0IGxvb2sgaW50 ZXJlc3RpbmcgZnJvbSBkZXNjcmlwdGlvbiBwb2ludCBvZiB2aWV3IHRoYXQncwo+PiB3aHkgYWxs IHRoZSB0aW1lIHRoaW5raW5nIGlmIG1ha2VzIHNlbnNlIHRvIGFkZCBpdCB0byBrZXJuZWwuCj4g Cj4gV2hhdCBkbyB5b3Ugd2FudCB0byB0ZWxsIG1lPyBUaGF0IGZvciB0aGUgdGltZSBiZWluZywg aXQgZGlkbid0Cj4gYXBwZWFyIHRvIHlvdSB0byBhZGQgdGhlIGJvYXJkIHlvdXJzZWxmIC0gb3Ig ZG8geW91IHRoaW5nIGl0Cj4gZG9lc24ndCBtYWtlIHNlbnNlIGF0IGFsbC4gSWYgaXRzIHRoZSBs YXR0ZXIsIHdoYXQgd291bGQgYmUKPiBhY3R1YWwgcmVhc29uIHRvIGhhdmUgYSBib2FyZCBpbiBt YWlubGluZT8KCkkgaGF2ZSBiYWQgZXhwZXJpZW5jZSB3aXRoIGZvciBleGFtcGxlIEF2bmV0IGJv YXJkcyB3aGljaCBwZW9wbGUgYWRkIGFuZApub25lIGlzIHJlYWxseSB1cGRhdGluZyB0aGVtIGFu ZCB0aGV5IGFyZSBpbiB0aGUgc2FtZSBzdGF0ZSBmb3IgeWVhcnMuCgpMb25nIHRpbWUgYWdvIHdl IGFncmVlZCB0aGF0IGRvZXNuJ3QgbWFrZSBzZW5zZSB0byBkZXNjcmliZSBQTCBpbgp1cHN0cmVh bSBwcm9qZWN0cyBhbmQgd2Ugb25seSBkZXNjcmliZSBQUyBwYXJ0LiBJdCBtZWFucyB5b3UgbGlr ZWx5IG1pc3MKc2V2ZXJhbCB0aGluZ3Mgd2hpY2ggYXJlIHVzZWZ1bCBhbmQgdGhlIHJlYXNvbiBm b3IgdXNpbmcgdGhlc2UgU29DcyBpcyBQTC4KCkFzIHlvdSBsaWtlbHkga25vdyBYaWxpbnggaGFz IFZlcnNhbCBkZXZpY2UgYW5kIEkgZGlkbid0IHB1c2ggYW55IGRldmljZQp0cmVlIHRvIGFueSB1 cHN0cmVhbSBwcm9qZWN0IGFuZCB0aGlua2luZyBub3QgdG8gYWRkIGFueSBkZXNjcmlwdGlvbiBm b3IKYm9hcmRzIGFuZCBzdGF5IGluIHNvcnQgb2Ygc3BhY2UgdGhhdCAidmlydHVhbCIgZGVzY3Jp cHRpb24gZm9yIFNvQwpzaG91bGQgYmUgZW5vdWdoLiBNYXliZSBqdXN0IHZlcnNhbC5kdHNpIGFu ZCBvbmUga2l0Y2hlbiBzaW5rIERUIHNob3VsZApiZSBhZGRlZCBidXQgbm90IGRlc2NyaXB0aW9u IGZvciBhbGwgYm9hcmRzLgoKVGhlIHNhbWUgaXMgaWYgbWFrZSBzZW5zZSB0byBwdXNoIGFsbCBE VHMgZm9yIGFsbCBzdGFuZGFyZCB4aWxpbnggenlucW1wCmV2YWx1YXRpb24gYm9hcmRzLiBJZiB0 aGVyZSBpcyBzb21ldGhpbmcgaW50ZXJlc3RpbmcvbmV3IEkgdGhvdWdodCBpdAptYWtlcyBzZW5z ZSB0byBhZGQgaXQgYXMgcGF0dGVybiB0byBmb2xsb3cuIEJ1dCBmb3IgYm9hcmRzIHdoaWNoIGxv b2tzCnZlcnkgc2ltaWxhciBmcm9tIFBTIHBvaW50IG9mIHZpZXcgSSBkb24ndCB0aGluayB0aGVy ZSBpcyByZWFsIHZhbHVlIHRvCmFkZCBhbmQgaW52ZXN0IHRpbWUgZm9yIG1haW50YWluaW5nLgoK QmFjayB0byB5b3VyIGNhc2UuIEJvYXJkIGlzIGNoZWFwIHdoaWNoIGlzIG5vdCBhbGwgdGhlIHRp bWUgY2FzZSBmb3IgYW55CnhpbGlueCBib2FyZCBidXQgeW91IGhhdmUgb25seSB1YXJ0LCBzZCBh bmQgcGFydGlhbGx5IGRlc2NyaWJlZCBldGhlcm5ldAp3aGljaCBkb2Vzbid0IHdvcmsgd2l0aG91 dCBQTC4gSXMgaXQgd29ydGggdG8gaGF2ZSB0aGlzIGRlc2NyaWJlZD8KRXNwZWNpYWxseSB3aGVu IGl0IGlzIHZpc2libGUgdGhhdCB5b3UgbmVlZCB0byBkZXNjcmliZSBjdXN0b20gUEwgYW5kIERU Cm92ZXJsYXlzIGFyZSBub3Qgc29saWQgeWV0LgoKVGhhbmtzLApNaWNoYWwKCl9fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFp bGluZyBsaXN0CmxpbnV4LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlz dHMuaW5mcmFkZWFkLm9yZy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK