[PATCH] ASoC: clarify that SND_SOC_IMX_SGTL5000 is the old driver

[Luca Ceresoli <luca.ceresoli@bootlin.com>]

Both SND_SOC_IMX_SGTL5000 and SND_SOC_FSL_ASOC_CARD implement the
fsl,imx-audio-sgtl5000 compatible string, which is confusing. It took a
little research to find out that the latter is much newer and it is
supposed to be the preferred choice since several years.

Add a clarification note to avoid wasting time for future readers.

Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>

---

Cc: Liam Girdwood <lgirdwood@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Cc: Viorel Suman <viorel.suman@nxp.com>
Cc: Shengjiu Wang <shengjiu.wang@nxp.com>
Cc: alsa-devel@alsa-project.org
Cc: linux-kernel@vger.kernel.org
---
 sound/soc/fsl/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/fsl/Kconfig b/sound/soc/fsl/Kconfig
index 614eceda6b9e..33b67db8794e 100644
--- a/sound/soc/fsl/Kconfig
+++ b/sound/soc/fsl/Kconfig
@@ -294,6 +294,10 @@ config SND_SOC_IMX_SGTL5000
 	  Say Y if you want to add support for SoC audio on an i.MX board with
 	  a sgtl5000 codec.
 
+	  Note that this is an old driver. Consider enabling
+	  SND_SOC_FSL_ASOC_CARD and SND_SOC_SGTL5000 to use the newer
+	  driver.
+
 config SND_SOC_IMX_SPDIF
 	tristate "SoC Audio support for i.MX boards with S/PDIF"
 	select SND_SOC_IMX_PCM_DMA
-- 
2.34.1