linux-kernel - Re: [V4, 2/3] interconnect: qcom: Add SC7180 interconnect provider driver

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Date:   Fri, 28 Feb 2020 10:53:37 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Odelu Kukatla <okukatla@...eaurora.org>, linux-pm@...r.kernel.org
Cc:     daidavid1@...eaurora.org, bjorn.andersson@...aro.org,
        evgreen@...gle.com, Andy Gross <agross@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        sboyd@...nel.org, ilina@...eaurora.org, seansw@....qualcomm.com,
        elder@...aro.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [V4, 2/3] interconnect: qcom: Add SC7180 interconnect provider
 driver

Hi Odelu,

Thank you for this patchset!

On 2/25/20 17:59, Odelu Kukatla wrote:
> Add driver for the Qualcomm interconnect buses found in SC7180 based
> platforms. The topology consists of several NoCs that are controlled by
> a remote processor that collects the aggregated bandwidth for each
> master-slave pairs.
> 
> Signed-off-by: Odelu Kukatla <okukatla@...eaurora.org>
> ---
>  drivers/interconnect/qcom/Kconfig  |   9 +
>  drivers/interconnect/qcom/Makefile |   2 +
>  drivers/interconnect/qcom/sc7180.c | 641 +++++++++++++++++++++++++++++++++++++
>  drivers/interconnect/qcom/sc7180.h | 149 +++++++++
>  4 files changed, 801 insertions(+)
>  create mode 100644 drivers/interconnect/qcom/sc7180.c
>  create mode 100644 drivers/interconnect/qcom/sc7180.h
> 
> diff --git a/drivers/interconnect/qcom/Kconfig b/drivers/interconnect/qcom/Kconfig
> index 08cfd67..c8e74b0 100644
> --- a/drivers/interconnect/qcom/Kconfig
> +++ b/drivers/interconnect/qcom/Kconfig
> @@ -42,6 +42,15 @@ config INTERCONNECT_QCOM_RPMH
>  	depends on INTERCONNECT_QCOM || COMPILE_TEST
>  	depends on QCOM_COMMAND_DB
>  
> +config INTERCONNECT_QCOM_SC7180
> +	tristate "Qualcomm SC7180 interconnect driver"
> +	depends on INTERCONNECT_QCOM
> +	select INTERCONNECT_QCOM_RPMH
> +	select INTERCONNECT_QCOM_BCM_VOTER

IMHO, we should still list here the dependencies here, or for some randconfig
builds we may get warnings for unmet direct dependencies. So i think you got
it right in your v3.

btw. It is also a good practice to list the changes in your cover letter, so
people who have looked at previous versions of that patches would know what
changed.

> +	help
> +	  This is a driver for the Qualcomm Network-on-Chip on sc7180-based
> +	  platforms.
> +
>  config INTERCONNECT_QCOM_SDM845
>  	tristate "Qualcomm SDM845 interconnect driver"
>  	depends on INTERCONNECT_QCOM
> diff --git a/drivers/interconnect/qcom/Makefile b/drivers/interconnect/qcom/Makefile
> index d591bb5..5325558 100644
> --- a/drivers/interconnect/qcom/Makefile
> +++ b/drivers/interconnect/qcom/Makefile
> @@ -5,6 +5,7 @@ qnoc-msm8916-objs			:= msm8916.o
>  qnoc-msm8974-objs			:= msm8974.o
>  qnoc-qcs404-objs			:= qcs404.o
>  icc-rpmh-obj				:= icc-rpmh.o
> +qnoc-sc7180-objs			:= sc7180.o
>  qnoc-sdm845-objs			:= sdm845.o
>  icc-smd-rpm-objs			:= smd-rpm.o
>  
> @@ -13,5 +14,6 @@ obj-$(CONFIG_INTERCONNECT_QCOM_MSM8916) += qnoc-msm8916.o
>  obj-$(CONFIG_INTERCONNECT_QCOM_MSM8974) += qnoc-msm8974.o
>  obj-$(CONFIG_INTERCONNECT_QCOM_QCS404) += qnoc-qcs404.o
>  obj-$(CONFIG_INTERCONNECT_QCOM_RPMH) += icc-rpmh.o
> +obj-$(CONFIG_INTERCONNECT_QCOM_SC7180) += qnoc-sc7180.o
>  obj-$(CONFIG_INTERCONNECT_QCOM_SDM845) += qnoc-sdm845.o
>  obj-$(CONFIG_INTERCONNECT_QCOM_SMD_RPM) += icc-smd-rpm.o
> diff --git a/drivers/interconnect/qcom/sc7180.c b/drivers/interconnect/qcom/sc7180.c
> new file mode 100644
> index 0000000..dcf493d
> --- /dev/null
> +++ b/drivers/interconnect/qcom/sc7180.c
> @@ -0,0 +1,641 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2020, The Linux Foundation. All rights reserved.
> + *
> + */
> +
> +#include <linux/device.h>
> +#include <linux/interconnect.h>
> +#include <linux/interconnect-provider.h>
> +#include <linux/module.h>
> +#include <linux/of_platform.h>

I thought you will remove this? Maybe you missed some of the comments on v2.
Please check.

Thanks,
Georgi