Re: [PATCH 2/4] soc: qcom: pmic_glink: Introduce base PMIC GLINK driver

From: Johan Hovold <johan@kernel.org>
To: Bjorn Andersson <andersson@kernel.org>
Cc: Andy Gross <agross@kernel.org>,
	Konrad Dybcio <konrad.dybcio@somainline.org>,
	Rob Herring <robh+dt@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Sebastian Reichel <sre@kernel.org>,
	linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org
Subject: Re: [PATCH 2/4] soc: qcom: pmic_glink: Introduce base PMIC GLINK driver
Date: Fri, 11 Nov 2022 13:57:27 +0100	[thread overview]
Message-ID: <Y25Gtwaws9wDU4a+@hovoldconsulting.com> (raw)
In-Reply-To: <20220818031512.319310-3-bjorn.andersson@linaro.org>

[ Resending to Bjorn's current address. ]

On Wed, Aug 17, 2022 at 08:15:10PM -0700, Bjorn Andersson wrote:
> The PMIC GLINK service runs on one of the co-processors of some modern
> Qualcomm platforms and implements USB-C and battery managements. It uses
> a message based protocol over GLINK for communication with the OS, hence
> the name.
> 
> The driver implemented provides the rpmsg device for communication and
> uses auxilirary bus to spawn off individual devices in respsective
> subsystem. The auxilirary devices are spawned off from a
> platform_device, so that the drm_bridge is available early, to allow the
> DisplayPort driver to probe even before the remoteproc has spun up.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>  drivers/soc/qcom/Kconfig            |  14 ++
>  drivers/soc/qcom/Makefile           |   1 +
>  drivers/soc/qcom/pmic_glink.c       | 336 ++++++++++++++++++++++++++++
>  include/linux/soc/qcom/pmic_glink.h |  32 +++
>  4 files changed, 383 insertions(+)
>  create mode 100644 drivers/soc/qcom/pmic_glink.c
>  create mode 100644 include/linux/soc/qcom/pmic_glink.h
> 
> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
> index e0d7a5459562..2289f5e0d5ad 100644
> --- a/drivers/soc/qcom/Kconfig
> +++ b/drivers/soc/qcom/Kconfig
> @@ -91,6 +91,20 @@ config QCOM_PDR_HELPERS
>  	tristate
>  	select QCOM_QMI_HELPERS
>  
> +config QCOM_PMIC_GLINK
> +	tristate "Qualcomm PMIC GLINK driver"
> +	depends on RPMSG
> +	depends on TYPEC
> +	depends on DRM

You should add

	select AUXILIARY_BUS

here as this driver will not compile without it. Then you can drop the
corresponding select from the battery driver.

> +	select QCOM_PDR_HELPERS
> +	help
> +	  The Qualcomm PMIC GLINK driver provides access, over GLINK, to the
> +	  USB and battery firmware running on one of the coprocessors in
> +	  several modern Qualcomm platforms.
> +
> +	  Say yes here to support USB-C and battery status on modern Qualcomm
> +	  platforms.

Johan