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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 72E71C433E1 for ; Wed, 26 Aug 2020 15:13:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4681720707 for ; Wed, 26 Aug 2020 15:13:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=puresoftware-com.20150623.gappssmtp.com header.i=@puresoftware-com.20150623.gappssmtp.com header.b="FB+t+sVO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727963AbgHZPN0 (ORCPT ); Wed, 26 Aug 2020 11:13:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726988AbgHZPNY (ORCPT ); Wed, 26 Aug 2020 11:13:24 -0400 Received: from mail-ed1-x544.google.com (mail-ed1-x544.google.com [IPv6:2a00:1450:4864:20::544]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 62439C061574 for ; Wed, 26 Aug 2020 08:13:24 -0700 (PDT) Received: by mail-ed1-x544.google.com with SMTP id q21so850103edv.1 for ; Wed, 26 Aug 2020 08:13:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=puresoftware-com.20150623.gappssmtp.com; s=20150623; h=return-receipt-to:from:references:in-reply-to:mime-version :thread-index:disposition-notification-to:date:message-id:subject:to :cc; bh=oKNHl4Ny4sbuCKjpuRdgyZBkTgWLx5UkA3LoZG6V0lk=; b=FB+t+sVO1/ukFnYVyxTChBvyLa9GO6obbOPr9SKpuFup/4ZpcKuf8oUyzovXq85LJn PMr7eKU64znflOOOZMHs2rxL+u2r1ECZGrY573Am4BkapgOukgtfFVpIZptIJrI+NAWS LqneKqDYE0pj1LYEzHA/rPRFTXnq7pwFEjbz0rsfdDmfJzAHl+jnB6Mwaxgt/DofJG1V P7Hq2FrCoCtMvck+9N13aUemZGluAFC1Za44VxUz/z9+EETIFI4CwhFucg+6kfR2ZgE1 O7E5gwAk8ZEeIZai2ngoCB9yHMfkP7Y4ixQ1VzauUwQIDiwH6MV3WENW37VfyVjIGisx 6A6g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:return-receipt-to:from:references:in-reply-to :mime-version:thread-index:disposition-notification-to:date :message-id:subject:to:cc; bh=oKNHl4Ny4sbuCKjpuRdgyZBkTgWLx5UkA3LoZG6V0lk=; b=cHdmKr2ScQtI0+4Gsp+7EOIe+DUFc5MadkWwsWdRGk0c7koDeio3bWoAylHOCXUIms 9Sp/6Kfx7oHrtI4sBrvgRIDHo5kfYlQ+QnMS0gGAsPjzRhfXKfCowjt5ey8PG3FgFaVH yBIOMwfdhdR89R35bcul1KcHDF4xf7JmSKYn0pDbwi/JvoNTvJ4XRBcYl1FyyVRFPrss uap7b87GMQIY6Pq9XhAGtVyrOFIhSn44uwxl3peoXufnCMMUSr42naV0EB4s8TSqJQJX pvMe5Gyq2Dg7DKrLlieBJA0eKDknGuJPfxJuW9v2iBUWOCq5Nj7yfgGBKF/LiQKsbhJe nhjA== X-Gm-Message-State: AOAM532a3ONx1e1gzTHK8/0Jq2qlxWtV2mSOtCJSLpADOs0XHYGGqY4S JujN5FCIo7k7ISrGo54HMXNVAw8+F2pWBfd4FqSHFQ== X-Google-Smtp-Source: ABdhPJzsRVGSLe4lpmQnlT3HvkKy/20pNcOp7WTKLjOO89AFrfG0IzVA4X1dUrgiUuwohWHrh+PafH6GPl/mKHJR8rI= X-Received: by 2002:a05:6402:1d17:: with SMTP id dg23mr15482591edb.198.1598454802941; Wed, 26 Aug 2020 08:13:22 -0700 (PDT) From: Kuldip Dwivedi References: <20200821131029.11440-1-kuldip.dwivedi@puresoftware.com> <20200821140718.GH4870@sirena.org.uk> <20200822152118.rlwbcgfk4abjldtg@skbuf> <20200826114758.4agph53ag2fin6um@skbuf> <20200826142312.GH4965@sirena.org.uk> <20200826144744.c4yzgoovk6f4t3id@skbuf> In-Reply-To: <20200826144744.c4yzgoovk6f4t3id@skbuf> MIME-Version: 1.0 X-Mailer: Microsoft Outlook 16.0 Thread-Index: AQF7/ycK6cTpjLXBKD+ruXNZEs6GEAE4wSq+AcJdu4sBqH1NLAEjPgFbAgU/99oCtsCFlAIqZ5/wqZoKVKA= Date: Wed, 26 Aug 2020 20:43:20 +0530 Message-ID: <2e19f8979be4f962045a1597bdbe7886@mail.gmail.com> Subject: RE: [PATCH] spi: spi-fsl-dspi: Add ACPI support To: Vladimir Oltean , Mark Brown Cc: Qiang Zhao , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, Pankaj Bansal , Varun Sethi , Tanveer Alam Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > -----Original Message----- > From: Vladimir Oltean > Sent: Wednesday, August 26, 2020 8:18 PM > To: Mark Brown > Cc: Qiang Zhao ; kuldip dwivedi > ; linux-spi@vger.kernel.org; linux- > kernel@vger.kernel.org; Pankaj Bansal ; Varun Sethi > ; Tanveer Alam > Subject: Re: [PATCH] spi: spi-fsl-dspi: Add ACPI support > > On Wed, Aug 26, 2020 at 03:23:12PM +0100, Mark Brown wrote: > > On Wed, Aug 26, 2020 at 02:47:58PM +0300, Vladimir Oltean wrote: > > > > > - The compatible string plays an integral part in the functionality of > > > the spi-fsl-dspi driver. I want to see a solution for ACPI where the > > > driver knows on which SoC it's running on. Otherwise it doesn't know > > > what are the silicon parameters of the DSPI module (XSPI present or > > > not, DMA present or not, FIFO depth). I don't see that now. I just see > > > something hardcoded for: > > > { "NXP0005", .driver_data = > > > (kernel_ulong_t)&devtype_data[LS2085A], } > > > > Based on some other stuff I've seen with ACPI on NXP stuff it looks > > like they're following the same scheme but only caring about that one > > SoC for the time being. > > So, no argument about caring only about ACPI on one particular SoC for the time > being, but there's a big difference between a solution that works for N=1 and one > that works for N=2... > > Showing my ignorance here, but is there something equivalent to > of_machine_is_compatible() for ACPI? Just a query, Can't we use meaningful HID for different SoC just like compatible strings in DT ? In this way Silicon parameters can also be added in fsl_dspi_devtype_data structure , which is already exist in driver > > Thanks, > -Vladimir