linux-kernel - Re: [PATCH 1/2] ASoC: rt5677: Add ACPI support

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Message-ID: <20160816172006.GW9347@sirena.org.uk>
Date:	Tue, 16 Aug 2016 18:20:06 +0100
From:	Mark Brown <broonie@...nel.org>
To:	John Keeping <john@...anate.com>
Cc:	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Jie Yang <yang.jie@...ux.intel.com>,
	Bard Liao <bardliao@...ltek.com>,
	Oder Chiou <oder_chiou@...ltek.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>, Ben Zhang <benzh@...omium.org>,
	Dylan Reid <dgreid@...omium.org>
Subject: Re: [PATCH 1/2] ASoC: rt5677: Add ACPI support

On Sun, Aug 14, 2016 at 12:18:22PM +0100, John Keeping wrote:

> The Chromebook Pixel 2015 uses this codec with the ACPI ID RT5677CE, so
> add an ACPI match table and support for reading properties from ACPI.

This would be a lot easier to review with a concrete description of what
"support for reading properties from ACPI" means and probably also split
out a bit so that different things were being added separately.

> +/* GPIO indexes defined by ACPI */
> +enum {
> +	RT5677_GPIO_PLUG_DET,
> +	RT5677_GPIO_MIC_PRESENT_L,
> +	RT5677_GPIO_HOTWORD_DET_L,
> +	RT5677_GPIO_DSP_INT,
> +	RT5677_GPIO_HP_AMP_SHDN_L,
> +};

If these are an ABI you should explicitly assign the values so that they
can't get remapped by future edits.  If they're not an ABI I don't
understand the comment.

> +	if (ACPI_HANDLE(dev)) {
> +		u32 val;
> +
> +		if (!device_property_read_u32(dev, "DCLK", &val))
> +			rt5677->pdata.dmic2_clk_pin = val;
> +
> +		rt5677->pdata.in1_diff = device_property_read_bool(dev, "IN1");
> +		rt5677->pdata.in2_diff = device_property_read_bool(dev, "IN2");

What happens if someone makes a machine which uses the DT<->ACPI
mappings (especially given that this is currently undocumented)?  That
would not work which defeats the whole purpose of using the device
property APIs.  Shouldn't we be accepting either property?

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