linux-kernel - Re: [alsa-devel] [RFC PATCH 8/9] soundwire: intel: remove platform devices and provide new interface

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Date:   Tue, 17 Sep 2019 09:29:52 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     alsa-devel@...a-project.org, tiwai@...e.de,
        linux-kernel@...r.kernel.org,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        vkoul@...nel.org, broonie@...nel.org,
        srinivas.kandagatla@...aro.org, jank@...ence.com,
        slawomir.blauciak@...el.com, Sanyog Kale <sanyog.r.kale@...el.com>,
        Bard liao <yung-chuan.liao@...ux.intel.com>,
        Rander Wang <rander.wang@...ux.intel.com>
Subject: Re: [alsa-devel] [RFC PATCH 8/9] soundwire: intel: remove platform
 devices and provide new interface

On 9/17/19 12:55 AM, Greg KH wrote:
> On Mon, Sep 16, 2019 at 04:23:41PM -0500, Pierre-Louis Bossart wrote:
>> +/**
>> + * sdw_intel_probe() - SoundWire Intel probe routine
>> + * @parent_handle: ACPI parent handle
>> + * @res: resource data
>> + *
>> + * This creates SoundWire Master and Slave devices below the controller.
>> + * All the information necessary is stored in the context, and the res
>> + * argument pointer can be freed after this step.
>> + */
>> +struct sdw_intel_ctx
>> +*sdw_intel_probe(struct sdw_intel_res *res)
>> +{
>> +	return sdw_intel_probe_controller(res);
>> +}
>> +EXPORT_SYMBOL(sdw_intel_probe);
>> +
>> +/**
>> + * sdw_intel_startup() - SoundWire Intel startup
>> + * @ctx: SoundWire context allocated in the probe
>> + *
>> + */
>> +int sdw_intel_startup(struct sdw_intel_ctx *ctx)
>> +{
>> +	return sdw_intel_startup_controller(ctx);
>> +}
>> +EXPORT_SYMBOL(sdw_intel_startup);
> 
> Why are you exporting these functions if no one calls them?

They are used in the next series, see '[RFC PATCH 04/12] ASoC: SOF: 
Intel: add SoundWire configuration interface'

+int hda_sdw_startup(struct snd_sof_dev *sdev)
+{
+	struct sof_intel_hda_dev *hdev;
+	int ret;
+
+	hdev = sdev->pdata->hw_pdata;
+
+	ret = sdw_intel_startup(hdev->sdw);
+	if (ret < 0)
+		return ret;
+	hda_sdw_int_enable(sdev, true);
+
+	return ret;
+}

These 4 functions sdw_intel_acpi_scan, sdw_intel_probe, 
sdw_intel_startup and sdw_intel_exit are the interface between the ASoC 
world and the Soundwire/Intel module.

I split the patches in two series to make the review and integration 
easier on maintainers. The first one is strictly contained within the 
driver/soundwire directory while will impact the soundwire and ASoC trees.