linux-kernel - Re: [PATCH 01/11] ASoC: dai_dma: remove slave

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Date:   Mon, 15 Nov 2021 11:14:12 +0100
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Arnd Bergmann <arnd@...nel.org>, Vinod Koul <vkoul@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, Andy Gross <agross@...nel.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Baolin Wang <baolin.wang7@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Hyun Kwon <hyun.kwon@...inx.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Jon Hunter <jonathanh@...dia.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Laxman Dewangan <ldewangan@...dia.com>,
        Manivannan Sadhasivam <mani@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Michal Simek <michal.simek@...inx.com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Scott Branden <sbranden@...adcom.com>,
        Takashi Iwai <tiwai@...e.com>,
        Thierry Reding <thierry.reding@...il.com>,
        alsa-devel@...a-project.org, bcm-kernel-feedback-list@...adcom.com,
        dmaengine@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-rpi-kernel@...ts.infradead.org, linux-serial@...r.kernel.org,
        linux-spi@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 01/11] ASoC: dai_dma: remove slave_id field

On 11/15/21 9:53 AM, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> This field is never set, and serves no purpose, so remove it.

I agree that we should remove it. Its been legacy support code for a 
while, but the description that there is no user is not right.

The tegra20_spdif driver obviously uses it and that user is removed in 
this patch. I think it makes sense to split that out into a separate 
patch with a description why the driver will still work even with 
slave_id removed. Maybe the best is to remove the whole tegra20_spdif 
driver.

> diff --git a/sound/soc/tegra/tegra20_spdif.c b/sound/soc/tegra/tegra20_spdif.c
> index 9fdc82d58db3..1c3385da6f82 100644
> --- a/sound/soc/tegra/tegra20_spdif.c
> +++ b/sound/soc/tegra/tegra20_spdif.c
> @@ -284,7 +284,6 @@ static int tegra20_spdif_platform_probe(struct platform_device *pdev)
>   	spdif->playback_dma_data.addr = mem->start + TEGRA20_SPDIF_DATA_OUT;
>   	spdif->playback_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
>   	spdif->playback_dma_data.maxburst = 4;
> -	spdif->playback_dma_data.slave_id = dmareq->start;
>   
dmareq is now unused and should be removed as well.
>   	pm_runtime_enable(&pdev->dev);
>