linux-kernel - Re: [PATCH v10 0/3] Maxim Integrated MAX77759 PMIC MFD-based drivers

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Message-ID: <20250509142604.GF2492385@google.com>
Date: Fri, 9 May 2025 15:26:04 +0100
From: Lee Jones <lee@...nel.org>
To: André Draszik <andre.draszik@...aro.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	Srinivas Kandagatla <srini@...nel.org>, Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>,
	Peter Griffin <peter.griffin@...aro.org>,
	Tudor Ambarus <tudor.ambarus@...aro.org>,
	Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-gpio@...r.kernel.org, linux-hardening@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v10 0/3] Maxim Integrated MAX77759 PMIC MFD-based drivers

On Fri, 09 May 2025, André Draszik wrote:

> Hi,
> 
> This series improves support for the Maxim Integrated MAX77759
> companion PMIC for USB Type-C applications using the MFD framework.
> 
> This series must be applied in-order, due to interdependencies of some
> of the patches:
> * to avoid use of undocumented compatibles by the newly added drivers,
>   the bindings are added first in this series
> * patch 1 ("dt-bindings: gpio: add max77759 binding") also creates a
>   new MAINTAINERS entry, including a wildcard match for the other
>   bindings in this series
> * patch 3 ("dt-bindings: mfd: add max77759 binding") references the
>   bindings added in patch 1 and 2 and can not work if those aren't
>   available
> * patch 4 ("mfd: max77759: add Maxim MAX77759 core mfd driver") adds
>   the core MFD driver, which also exposes an API to its leaf drivers
>   and is used by patches 5 and 6
> * patches 5 and 6 won't compile without patch 4
> 
> The MAX77759 PMIC includes Battery Charger, Fuel Gauge, temperature
> sensors, USB Type-C Port Controller (TCPC), NVMEM, and a GPIO expander.
> 
> This PMIC is used on the Google Pixel 6 and 6 Pro (oriole / raven).
> 
> This series adds support for the top-level MFD device, the gpio, and
> nvmem cells. Other components are excluded for the following reasons:
> 
>     While in the same package, Fuel Gauge and TCPC have separate and
>     independent I2C addresses, register maps, interrupt lines, and
>     aren't part of the top-level package interrupt hierarchy.
>     Furthermore, a driver for the TCPC part exists already (in
>     drivers/usb/typec/tcpm/tcpci_maxim_core.c).
> 
>     I'm leaving out temperature sensors and charger in this submission,
>     because the former are not in use on Pixel 6 and I therefore can
>     not test them, and the latter can be added later, once we look at
>     the whole charging topic in more detail.
> 
> To make maintainers' work easier, I am planning to send the relevant
> DTS and defconfig changes via a different series, unless everything
> is expected to go via Lee's MFD tree in one series?
> 
> Cheers,
> Andre'

Okay, this (and the DT bindings) has been applied and submitted for
testing.  Once successful, I'll get a PR out for the other maintainers
to pull from.

Note to self: ib-mfd-gpio-nvmem-6.16

-- 
Lee Jones [李琼斯]