linux-kernel - [RFC PATCH v1 0/2] iio: adc: meson: add MPLL clock workaround for GXLX

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Message-ID: <20241231194207.2772750-1-martin.blumenstingl@googlemail.com>
Date: Tue, 31 Dec 2024 20:42:05 +0100
From: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To: linux-amlogic@...ts.infradead.org,
	linux-iio@...r.kernel.org
Cc: devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	gnstark@...utedevices.com,
	jic23@...nel.org,
	lars@...afoo.de,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	christianshewitt@...il.com,
	Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [RFC PATCH v1 0/2] iio: adc: meson: add MPLL clock workaround for GXLX

Hello,

Amlogic GXLX SoCs seem to be mostly the same silicon as GXL. The only
known differences are:
- one less Mali-450 GPU core
- no VP9 codec
- and an odd one: the three MPLL clocks need a bit toggled in the SAR
  ADC register space

This series attempt to fix audio output (which relies on the MPLL
clocks) on the GXLX boards. Unfortunately all we have is a downstream
commit [0] without any further explanation (or anyone who wants to
provide details on this). Since it's not clear if this is a gate, a
reset or some other hardware fix: the driver side includes a warning
for users to update their .dtb along with kernel images in case we
ever figure out what these bits do and how to model them properly.


[0] https://github.com/khadas/linux/commit/d1d98f2ed8c83eb42af8880ed8e206aa402dd70a#diff-c5aaf54323ef93777c5083de37f933058ea8d0af79a1941e0b5a0667dc0f89b3


Martin Blumenstingl (2):
  dt-bindings: iio: adc: amlogic,meson-saradc: Add GXLX SoC compatible
  iio: adc: meson: add support for the GXLX SoC

 .../iio/adc/amlogic,meson-saradc.yaml         |  1 +
 drivers/iio/adc/meson_saradc.c                | 34 +++++++++++++++++++
 2 files changed, 35 insertions(+)

-- 
2.47.1