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=-0.5 required=3.0 tests=DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED,DKIM_VALID,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 732C3C48BD3 for ; Wed, 26 Jun 2019 17:07:53 +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 4A5952085A for ; Wed, 26 Jun 2019 17:07:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Xx4aoT4H"; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="GOi4AvHX" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4A5952085A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=gmail.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:To:Subject:Reply-To:Content-ID:Content-Description :Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=JQ/Sb0fH9H58hS0D+Qqr17Oc6xdBErxBC4374tH4UJI=; b=Xx4aoT4HAN8S/1 JUX5DB4SqQm9BIcS4bi8fw5AESRl7mo69YCvthlNAcd/MnhEVwrStWL3DvRjHKdJAmDlmiRFKTsKb pgvwNjYrylO6y6xQzRYAxsFVsaWMN8eYUhAcrEGd+R8l7f0R3C40nTSgo/pcDgKO7rhYdlO/kkPTC L/cElkjm2KW9w1P/8Dqf92Da/iDiw5Zw2uyaDmTQ88QSPHxLbPkoirHw+6Y50kgYHLYA8I0YpM4Li Wa5Kv8qqh+4064jRH8ZAVJtEnHaGuwDHmrow9r1c+jIWISYDPd2BAbZGmsZ2akGM9g0atyoSOmTsG qkYmBqxpYryON5SNO2VA==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hgBOg-0003eM-Uu; Wed, 26 Jun 2019 17:07:50 +0000 Received: from mail-pl1-x642.google.com ([2607:f8b0:4864:20::642]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1hgBOe-0003dx-8i for linux-arm-kernel@lists.infradead.org; Wed, 26 Jun 2019 17:07:49 +0000 Received: by mail-pl1-x642.google.com with SMTP id g4so1776704plb.5 for ; Wed, 26 Jun 2019 10:07:47 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=subject:to:cc:references:from:openpgp:autocrypt:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=3zywxKr10LjnjZ9Rap1BNmy2qmpKbPIN5uH0kCbkzmw=; b=GOi4AvHXY42TlxU4FLVLGeMfAAQnvMD9U0W5flWH6GCVvXCrS6R/OHJmk/639twh3y H78vtvCaQlkSft+qU1iBAdOnHdW5u/0piZZR3sy0ywv+LChMZa6YFLtQY6G3FXYUAV/m Apbh9KG/t0oGPH/X4O7I/CDy2XX3l0FEBf26Mgws8aM5U/01dQdvTPh7GTBMWdqRXLnx AR+vhvZUiCzTReV/yVKydxdy5w5jHYfSU+UwLBpH94rBc3635fdMtN+dZjUBiqnmxLoj 5ZqKbxI4Gn7Nrp3qzTnBR9vxpT1TfwZ8G45enxfC5U7eGmuzJTNabMKaU4d9MYsuygNg SUSA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:openpgp:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=3zywxKr10LjnjZ9Rap1BNmy2qmpKbPIN5uH0kCbkzmw=; b=FHaiZFbBdrmzcx2A8+5KEmpZMfLAEwaG2TfYX8KmuC55dLSyw+Uj9ls0W7UIa8+CDS 9dlZdLJnZzmV1mzJRvR1ZAfROxEgCHjigC+wQ0M1wYBP8plG83Ossgb+AXvsMxO2kvmx oGu3ZQiVYlJDNGYp7YjfLDmUMU8hO/IFqtlVxt/K4X/HAnumulUQ4kIQkRNZV776XagC 8U2NNHjson12WnE3oIXadaZrRpH1Ux/lzhD4VV4iwhnMG/97PjdWtNu+1CRnSECT3xSu ua1VJc+511ktm87oZTFaqMVAEnvTK3xPQh+IuXzsrsEz25cP+P42LyK0SUw+is23xjb7 9UWg== X-Gm-Message-State: APjAAAWYB48ebPLMYs2SIsv9bHXs87286oYUzaRHHuyAJrlEeYK01zMV N7HC9FiRgqXrEgLR1Pf+c/4= X-Google-Smtp-Source: APXvYqyeYBe7ZlnY0KIV8hiBhjrA+4/eNG0i/EN6tBPsIIruAmSq5qUf/YKRYAc5enrucmAN1aSFxQ== X-Received: by 2002:a17:902:8eca:: with SMTP id x10mr6732654plo.266.1561568867411; Wed, 26 Jun 2019 10:07:47 -0700 (PDT) Received: from [10.67.50.91] ([192.19.223.252]) by smtp.googlemail.com with ESMTPSA id y19sm18341834pfe.150.2019.06.26.10.07.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 26 Jun 2019 10:07:46 -0700 (PDT) Subject: Re: [PATCH V2 2/2] mailbox: introduce ARM SMC based mailbox To: =?UTF-8?Q?Andr=c3=a9_Przywara?= , Peng Fan , Jassi Brar References: <20190603083005.4304-1-peng.fan@nxp.com> <20190603083005.4304-3-peng.fan@nxp.com> <20c6cd30-642d-5f6e-15b8-2ef925ed90a6@arm.com> From: Florian Fainelli Openpgp: preference=signencrypt Autocrypt: addr=f.fainelli@gmail.com; prefer-encrypt=mutual; keydata= mQGiBEjPuBIRBACW9MxSJU9fvEOCTnRNqG/13rAGsj+vJqontvoDSNxRgmafP8d3nesnqPyR xGlkaOSDuu09rxuW+69Y2f1TzjFuGpBk4ysWOR85O2Nx8AJ6fYGCoeTbovrNlGT1M9obSFGQ X3IzRnWoqlfudjTO5TKoqkbOgpYqIo5n1QbEjCCwCwCg3DOH/4ug2AUUlcIT9/l3pGvoRJ0E AICDzi3l7pmC5IWn2n1mvP5247urtHFs/uusE827DDj3K8Upn2vYiOFMBhGsxAk6YKV6IP0d ZdWX6fqkJJlu9cSDvWtO1hXeHIfQIE/xcqvlRH783KrihLcsmnBqOiS6rJDO2x1eAgC8meAX SAgsrBhcgGl2Rl5gh/jkeA5ykwbxA/9u1eEuL70Qzt5APJmqVXR+kWvrqdBVPoUNy/tQ8mYc nzJJ63ng3tHhnwHXZOu8hL4nqwlYHRa9eeglXYhBqja4ZvIvCEqSmEukfivk+DlIgVoOAJbh qIWgvr3SIEuR6ayY3f5j0f2ejUMYlYYnKdiHXFlF9uXm1ELrb0YX4GMHz7QnRmxvcmlhbiBG YWluZWxsaSA8Zi5mYWluZWxsaUBnbWFpbC5jb20+iGYEExECACYCGyMGCwkIBwMCBBUCCAME FgIDAQIeAQIXgAUCVF/S8QUJHlwd3wAKCRBhV5kVtWN2DvCVAJ4u4/bPF4P3jxb4qEY8I2gS 6hG0gACffNWlqJ2T4wSSn+3o7CCZNd7SLSC5BA0ESM+4EhAQAL/o09boR9D3Vk1Tt7+gpYr3 WQ6hgYVON905q2ndEoA2J0dQxJNRw3snabHDDzQBAcqOvdi7YidfBVdKi0wxHhSuRBfuOppu pdXkb7zxuPQuSveCLqqZWRQ+Cc2QgF7SBqgznbe6Ngout5qXY5Dcagk9LqFNGhJQzUGHAsIs hap1f0B1PoUyUNeEInV98D8Xd/edM3mhO9nRpUXRK9Bvt4iEZUXGuVtZLT52nK6Wv2EZ1TiT OiqZlf1P+vxYLBx9eKmabPdm3yjalhY8yr1S1vL0gSA/C6W1o/TowdieF1rWN/MYHlkpyj9c Rpc281gAO0AP3V1G00YzBEdYyi0gaJbCEQnq8Vz1vDXFxHzyhgGz7umBsVKmYwZgA8DrrB0M oaP35wuGR3RJcaG30AnJpEDkBYHznI2apxdcuTPOHZyEilIRrBGzDwGtAhldzlBoBwE3Z3MY 31TOpACu1ZpNOMysZ6xiE35pWkwc0KYm4hJA5GFfmWSN6DniimW3pmdDIiw4Ifcx8b3mFrRO BbDIW13E51j9RjbO/nAaK9ndZ5LRO1B/8Fwat7bLzmsCiEXOJY7NNpIEpkoNoEUfCcZwmLrU +eOTPzaF6drw6ayewEi5yzPg3TAT6FV3oBsNg3xlwU0gPK3v6gYPX5w9+ovPZ1/qqNfOrbsE FRuiSVsZQ5s3AAMFD/9XjlnnVDh9GX/r/6hjmr4U9tEsM+VQXaVXqZuHKaSmojOLUCP/YVQo 7IiYaNssCS4FCPe4yrL4FJJfJAsbeyDykMN7wAnBcOkbZ9BPJPNCbqU6dowLOiy8AuTYQ48m vIyQ4Ijnb6GTrtxIUDQeOBNuQC/gyyx3nbL/lVlHbxr4tb6YkhkO6shjXhQh7nQb33FjGO4P WU11Nr9i/qoV8QCo12MQEo244RRA6VMud06y/E449rWZFSTwGqb0FS0seTcYNvxt8PB2izX+ HZA8SL54j479ubxhfuoTu5nXdtFYFj5Lj5x34LKPx7MpgAmj0H7SDhpFWF2FzcC1bjiW9mjW HaKaX23Awt97AqQZXegbfkJwX2Y53ufq8Np3e1542lh3/mpiGSilCsaTahEGrHK+lIusl6mz Joil+u3k01ofvJMK0ZdzGUZ/aPMZ16LofjFA+MNxWrZFrkYmiGdv+LG45zSlZyIvzSiG2lKy kuVag+IijCIom78P9jRtB1q1Q5lwZp2TLAJlz92DmFwBg1hyFzwDADjZ2nrDxKUiybXIgZp9 aU2d++ptEGCVJOfEW4qpWCCLPbOT7XBr+g/4H3qWbs3j/cDDq7LuVYIe+wchy/iXEJaQVeTC y5arMQorqTFWlEOgRA8OP47L9knl9i4xuR0euV6DChDrguup2aJVU4hPBBgRAgAPAhsMBQJU X9LxBQkeXB3fAAoJEGFXmRW1Y3YOj4UAn3nrFLPZekMeqX5aD/aq/dsbXSfyAKC45Go0YyxV HGuUuzv+GKZ6nsysJ7kCDQRXG8fwARAA6q/pqBi5PjHcOAUgk2/2LR5LjjesK50bCaD4JuNc YDhFR7Vs108diBtsho3w8WRd9viOqDrhLJTroVckkk74OY8r+3t1E0Dd4wHWHQZsAeUvOwDM PQMqTUBFuMi6ydzTZpFA2wBR9x6ofl8Ax+zaGBcFrRlQnhsuXLnM1uuvS39+pmzIjasZBP2H UPk5ifigXcpelKmj6iskP3c8QN6x6GjUSmYx+xUfs/GNVSU1XOZn61wgPDbgINJd/THGdqiO iJxCLuTMqlSsmh1+E1dSdfYkCb93R/0ZHvMKWlAx7MnaFgBfsG8FqNtZu3PCLfizyVYYjXbV WO1A23riZKqwrSJAATo5iTS65BuYxrFsFNPrf7TitM8E76BEBZk0OZBvZxMuOs6Z1qI8YKVK UrHVGFq3NbuPWCdRul9SX3VfOunr9Gv0GABnJ0ET+K7nspax0xqq7zgnM71QEaiaH17IFYGS sG34V7Wo3vyQzsk7qLf9Ajno0DhJ+VX43g8+AjxOMNVrGCt9RNXSBVpyv2AMTlWCdJ5KI6V4 KEzWM4HJm7QlNKE6RPoBxJVbSQLPd9St3h7mxLcne4l7NK9eNgNnneT7QZL8fL//s9K8Ns1W t60uQNYvbhKDG7+/yLcmJgjF74XkGvxCmTA1rW2bsUriM533nG9gAOUFQjURkwI8jvMAEQEA AYkCaAQYEQIACQUCVxvH8AIbAgIpCRBhV5kVtWN2DsFdIAQZAQIABgUCVxvH8AAKCRCH0Jac RAcHBIkHD/9nmfog7X2ZXMzL9ktT++7x+W/QBrSTCTmq8PK+69+INN1ZDOrY8uz6htfTLV9+ e2W6G8/7zIvODuHk7r+yQ585XbplgP0V5Xc8iBHdBgXbqnY5zBrcH+Q/oQ2STalEvaGHqNoD UGyLQ/fiKoLZTPMur57Fy1c9rTuKiSdMgnT0FPfWVDfpR2Ds0gpqWePlRuRGOoCln5GnREA/ 2MW2rWf+CO9kbIR+66j8b4RUJqIK3dWn9xbENh/aqxfonGTCZQ2zC4sLd25DQA4w1itPo+f5 V/SQxuhnlQkTOCdJ7b/mby/pNRz1lsLkjnXueLILj7gNjwTabZXYtL16z24qkDTI1x3g98R/ xunb3/fQwR8FY5/zRvXJq5us/nLvIvOmVwZFkwXc+AF+LSIajqQz9XbXeIP/BDjlBNXRZNdo dVuSU51ENcMcilPr2EUnqEAqeczsCGpnvRCLfVQeSZr2L9N4svNhhfPOEscYhhpHTh0VPyxI pPBNKq+byuYPMyk3nj814NKhImK0O4gTyCK9b+gZAVvQcYAXvSouCnTZeJRrNHJFTgTgu6E0 caxTGgc5zzQHeX67eMzrGomG3ZnIxmd1sAbgvJUDaD2GrYlulfwGWwWyTNbWRvMighVdPkSF 6XFgQaosWxkV0OELLy2N485YrTr2Uq64VKyxpncLh50e2RnyAJ9Za0Dx0yyp44iD1OvHtkEI M5kY0ACeNhCZJvZ5g4C2Lc9fcTHu8jxmEkI= Message-ID: <886589a4-cc51-1c01-6ade-4a6a683407d2@gmail.com> Date: Wed, 26 Jun 2019 10:07:45 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.1 MIME-Version: 1.0 In-Reply-To: <20c6cd30-642d-5f6e-15b8-2ef925ed90a6@arm.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190626_100748_310671_C2E908DD X-CRM114-Status: GOOD ( 17.78 ) 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: Mark Rutland , Devicetree List , "festevam@gmail.com" , Linux Kernel Mailing List , Rob Herring , dl-linux-imx , ", Sascha Hauer" , Sudeep Holla , "van.freenix@gmail.com" , Shawn Guo , "linux-arm-kernel@lists.infradead.org" Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gNi8yNi8xOSAxMDowNSBBTSwgQW5kcsOpIFByenl3YXJhIHdyb3RlOgo+PiBTbyBJIGludHJv ZHVjZWQgaW50ZXJydXB0IGluIFYyLiBJbiBteSB0ZXN0Y2FzZSwgYWZ0ZXIgc21jIGNhbGwgZG9u ZSwKPj4gaXQgbWVhbnMgZmlybXdhcmUtPnNtYyBtYWlsYm94LT5maXJtd2FyZSBkb25lLiBJbnRl cnJ1cHQgbm90aWZpY2F0aW9uCj4+IGZyb20gZmlybXdhcmUtPkxpbnV4LCBtZWFucyBmaXJtd2Fy ZSBoYXMgZG9uZSB0aGUgb3BlcmF0aW9uLgo+Pgo+PiBXaGVuIHVzaW5nIGludGVycnVwdHMsIHdl IGNvdWxkIG5vdCBrbm93IHJlcy5hMCBhcyBzbWMgc3luYyBjYWxsLgo+Pgo+PiBJbnRlcnJ1cHRz IGlzIG5vdCBhIG11c3QgaW4gbXkgdGVzdGNhc2UsIEZsb3JpYW4sIEFuZHJlLCBkbyB5b3UgaGF2 ZQo+PiBhbnkgY29tbWVudHM/IFNob3VsZCBJIGtlZXAgaW50ZXJydXB0cyBpbiBWMyBvciBkcm9w IGl0IGFzIEphc3NpIGNvbW1lbnRzPwo+IAo+IFRoZSBzbWMgbWFpbGJveCBpcyBieSBpdHMgdmVy eSBkZXNpZ24gYSBvbmUtd2F5IGNoYW5uZWwgLSBhbmQgaXQncwo+IHN5bmNocm9ub3VzLiBJIHRo aW5rIHRoaXMgaXMgYWxsIHRoZSBtYWlsYm94IGRyaXZlciBzaG91bGQgYmUgY29uY2VybmVkCj4g YWJvdXQuIFRoZSBmYWN0IHRoYXQgdGhlcmUgaXMgYSBwcm90b2NvbCB1c2VyIHRoYXQgd291bGQg YmVuZWZpdCBmcm9tIGEKPiByZXR1cm4gY2hhbm5lbCBpcyBhIHNlcGFyYXRlIGlzc3VlLgo+IFRo ZSBTQ01JIGJpbmRpbmcgZXhwbGljaXRseSBtZW50aW9ucyAqdHdvKiBtYWlsYm94ZXMsIG9uZSBU WCwgb25lIFJYLCBzbwo+IHRoZSByZXR1cm4gY2hhbm5lbCBjb3VsZCBiZSB2ZXJ5IHdlbGwgaW1w bGVtZW50ZWQgYnkgYSBzZXBhcmF0ZSBkcml2ZXIuCj4gSSBhbSB3b25kZXJpbmcgaWYgd2UgZ2V0 IGF3YXkgd2l0aG91dCBhIGZ1bmN0aW9uaW5nIHJldHVybiBjaGFubmVsLCBhdAo+IGxlYXN0IGZv ciBhIHN1YnNldCBvZiBTQ01JIGZ1bmN0aW9uYWxpdHk/IENhbiB3ZSB1c2Ugc29tZSBkdW1teSBk cml2ZXI/Cj4gT3Igc3BlY2lmeSBhbm90aGVyIHNtYyBjaGFubmVsIHdpdGggc29tZSB1bmhhbmRs ZWQvaWdub3JlZCBjaGFubmVsIElECj4gZm9yIHRoYXQgcHVycG9zZT8KPiAKPiBTbyBJIHdvdWxk IGxlYXZlIHRoZSBJUlEgcmV0dXJuIGNoYW5uZWwgb3V0IGZvciBub3csIHVubGVzcyB3ZQo+IGRl c3BlcmF0ZWx5IG5lZWQgaXQuCgpUaGF0J3MgZmluZSwgdGhlIGluaXRpYWwgcG9pbnQgd2FzIHNw ZWNpZmljYWxseSBhYm91dCB0aGUgYmluZGluZwphbHJlYWR5IGRlZmluaW5nIGFuIG9wdGlvbmFs IGludGVycnVwdCBwcm9wZXJ0eSwgYnV0IHRoYXQgY2FuIGJlIHJlbW92ZWQKdG9vIGlmIHRoaXMg aXMgdG9vIG11Y2ggY29uZnVzaW9uIG9yIG9wZW5zIHVwIHRoZSBkaXNjdXNzaW9uIGJleW9uZCB0 aGlzCnN1Ym1pc3Npb24uCi0tIApGbG9yaWFuCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fXwpsaW51eC1hcm0ta2VybmVsIG1haWxpbmcgbGlzdApsaW51eC1h cm0ta2VybmVsQGxpc3RzLmluZnJhZGVhZC5vcmcKaHR0cDovL2xpc3RzLmluZnJhZGVhZC5vcmcv bWFpbG1hbi9saXN0aW5mby9saW51eC1hcm0ta2VybmVsCg== From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Fainelli Subject: Re: [PATCH V2 2/2] mailbox: introduce ARM SMC based mailbox Date: Wed, 26 Jun 2019 10:07:45 -0700 Message-ID: <886589a4-cc51-1c01-6ade-4a6a683407d2@gmail.com> References: <20190603083005.4304-1-peng.fan@nxp.com> <20190603083005.4304-3-peng.fan@nxp.com> <20c6cd30-642d-5f6e-15b8-2ef925ed90a6@arm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20c6cd30-642d-5f6e-15b8-2ef925ed90a6@arm.com> Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: =?UTF-8?Q?Andr=c3=a9_Przywara?= , Peng Fan , Jassi Brar Cc: Rob Herring , Mark Rutland , Sudeep Holla , ", Sascha Hauer" , dl-linux-imx , Shawn Guo , "festevam@gmail.com" , Devicetree List , Linux Kernel Mailing List , "linux-arm-kernel@lists.infradead.org" , "van.freenix@gmail.com" List-Id: devicetree@vger.kernel.org On 6/26/19 10:05 AM, André Przywara wrote: >> So I introduced interrupt in V2. In my testcase, after smc call done, >> it means firmware->smc mailbox->firmware done. Interrupt notification >> from firmware->Linux, means firmware has done the operation. >> >> When using interrupts, we could not know res.a0 as smc sync call. >> >> Interrupts is not a must in my testcase, Florian, Andre, do you have >> any comments? Should I keep interrupts in V3 or drop it as Jassi comments? > > The smc mailbox is by its very design a one-way channel - and it's > synchronous. I think this is all the mailbox driver should be concerned > about. The fact that there is a protocol user that would benefit from a > return channel is a separate issue. > The SCMI binding explicitly mentions *two* mailboxes, one TX, one RX, so > the return channel could be very well implemented by a separate driver. > I am wondering if we get away without a functioning return channel, at > least for a subset of SCMI functionality? Can we use some dummy driver? > Or specify another smc channel with some unhandled/ignored channel ID > for that purpose? > > So I would leave the IRQ return channel out for now, unless we > desperately need it. That's fine, the initial point was specifically about the binding already defining an optional interrupt property, but that can be removed too if this is too much confusion or opens up the discussion beyond this submission. -- Florian