From 644eebdbbf1154c995d6319c133d7d5b898c5ed2 Mon Sep 17 00:00:00 2001
From: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Date: Thu, 12 Nov 2020 16:38:15 -0600
Subject: [PATCH] ASoC: soc-acpi: add helper to identify parent driver.
Git-commit: 644eebdbbf1154c995d6319c133d7d5b898c5ed2
Patch-mainline: v5.11-rc1
References: jsc#SLE-16518

Intel machine drivers are used by parent platform drivers based on
closed-source firmware (Atom/SST and catpt) and SOF-based ones.

In some cases for ACPI-based platforms, the behavior of machine
drivers needs to be modified depending on the parent type, typically
for card names and power management.

An initial solution based on passing a boolean flag as a platform
device parameter was tested earlier. Since it looked overkill, this
patch suggests instead a simple string comparison to identify an SOF
parent device/driver.

Suggested-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20201112223825.39765-5-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 include/sound/soc-acpi.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/sound/soc-acpi.h b/include/sound/soc-acpi.h
index b16a844d16ef..9a43c44dcbbb 100644
--- a/include/sound/soc-acpi.h
+++ b/include/sound/soc-acpi.h
@@ -171,4 +171,10 @@ struct snd_soc_acpi_codecs {
 	u8 codecs[SND_SOC_ACPI_MAX_CODECS][ACPI_ID_LEN];
 };
 
+static inline bool snd_soc_acpi_sof_parent(struct device *dev)
+{
+	return dev->parent && dev->parent->driver && dev->parent->driver->name &&
+		!strcmp(dev->parent->driver->name, "sof-audio-acpi");
+}
+
 #endif
-- 
2.26.2