linux-kernel - Re: [PATCH 2/7] ASoC: amd: Registering device endpoints using MFD framework

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Message-ID: <20191014070318.GC4545@dell>
Date:   Mon, 14 Oct 2019 08:03:18 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     "RAVULAPATI, VISHNU VARDHAN RAO" 
        <Vishnuvardhanrao.Ravulapati@....com>
Cc:     "Deucher, Alexander" <Alexander.Deucher@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        "Mukunda, Vijendar" <Vijendar.Mukunda@....com>,
        Maruthi Srinivas Bayyavarapu <Maruthi.Bayyavarapu@....com>,
        "Mehta, Sanju" <Sanju.Mehta@....com>,
        Colin Ian King <colin.king@...onical.com>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        "moderated list:SOUND - SOC LAYER / DYNAMIC AUDIO POWER MANAGEM..." 
        <alsa-devel@...a-project.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/7] ASoC: amd: Registering device endpoints using MFD
 framework

On Thu, 10 Oct 2019, RAVULAPATI, VISHNU VARDHAN RAO wrote:

> Hi Lee,
> 
> We have two instances BT and I2S.
> We need to create devices with same name added with number of device
> like example:
> acp3x_i2s_playcap.1.auto<http://1.auto>
> acp3x_i2s_playcap.2.auto<http://2.auto>
> 
> by using MFD we can make it happen automatically by giving
> "acp3x_i2s_playcap" and other extension will be added by MFD add device API.

The auto extension is handed by the platform_deivce_alloc() API.

  platform_device_alloc("acp3x_i2s_playcap", PLATFORM_DEVID_AUTO);

> This helps us by rectifying the renaming issue which we get by using
> Platform_dev_create API`s.If we have to use platform related APIs then
> we need to give different naming conventions while creating the devices
> and cant use it in loop as we have 3 devices we need to call three
> explicitly.This make our code lengthy.
> If we use MFD it would help us a lot.
> 
> Please suggest us how can we proceed.

You have 2 choices available to you based on whether your device is an
MFD or not:

If yes, move it (or a part of it) to drivers/mfd.
If no, then use the platform_device_*() API.

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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