linux-kernel - Re: [PATCH 2/3] clk: owl: add clock driver for Actions S900 SoC

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Message-ID: <7c87aee4-dde4-ab3d-06b0-75f3686ab5dd@suse.de>
Date:   Sat, 4 Nov 2017 16:36:30 +0800
From:   Andreas Färber <afaerber@...e.de>
To:     Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc:     mturquette@...libre.com, sboyd@...eaurora.org, robh+dt@...nel.org,
        mark.rutland@....com, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        devicetree@...r.kernel.org, davem@...emloft.net,
        mchehab@...nel.org, rdunlap@...radead.org,
        daniel.thompson@...aro.org, amit.kucheria@...aro.org,
        liuwei@...ions-semi.com
Subject: Re: [PATCH 2/3] clk: owl: add clock driver for Actions S900 SoC

Hi Mani,

Still on travels, but some quick comments:

Please compare the CC list from my patch series - you seem to be missing
some Actions Semi people.

Am 01.11.2017 um 03:54 schrieb Manivannan Sadhasivam:
> This patch adds clock driver for Actions Semi OWL
> series S900 SoC.
> 
> Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> ---
>  MAINTAINERS                                    |   5 +
>  drivers/clk/Makefile                           |   1 +
>  drivers/clk/owl/Makefile                       |   2 +
>  drivers/clk/owl/clk-factor.c                   | 270 ++++++++++++
>  drivers/clk/owl/clk-pll.c                      | 346 +++++++++++++++
>  drivers/clk/owl/clk-s900.c                     | 587 +++++++++++++++++++++++++
>  drivers/clk/owl/clk.c                          | 318 ++++++++++++++
>  drivers/clk/owl/clk.h                          | 301 +++++++++++++

Taking into account previous arm/DT side comments I received, we should
use clk/actions/ rather than clk/owl/. We can still use owl- or -owl
inside actions/ if necessary.

>  include/dt-bindings/clock/actions,s900-clock.h | 141 ++++++
>  9 files changed, 1971 insertions(+)
>  create mode 100644 drivers/clk/owl/Makefile
>  create mode 100644 drivers/clk/owl/clk-factor.c
>  create mode 100644 drivers/clk/owl/clk-pll.c
>  create mode 100644 drivers/clk/owl/clk-s900.c
>  create mode 100644 drivers/clk/owl/clk.c
>  create mode 100644 drivers/clk/owl/clk.h
>  create mode 100644 include/dt-bindings/clock/actions,s900-clock.h
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 2d3d750..beae8aa 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1098,6 +1098,11 @@ F:	arch/arm/mach-*/
>  F:	arch/arm/plat-*/
>  T:	git git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc.git
>  
> +ARM/ACTIONS SEMI SoC CLOCK SUPPORT
> +L:	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

You're not a mailing list. If you want to be the maintainer (M:), fine
with me, but I'd like to be CC'ed please - either via R: here or by
extending the section below.

> +S:	Maintained
> +F:	drivers/clk/owl/

This is lacking the binding.

> +
>  ARM/ACTIONS SEMI ARCHITECTURE
>  M:	Andreas Färber <afaerber@...e.de>
>  L:	linux-arm-kernel@...ts.infradead.org (moderated for non-subscribers)
> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
> index c99f363..821c1e1 100644
> --- a/drivers/clk/Makefile
> +++ b/drivers/clk/Makefile
> @@ -75,6 +75,7 @@ endif
>  obj-y					+= mvebu/
>  obj-$(CONFIG_ARCH_MXS)			+= mxs/
>  obj-$(CONFIG_COMMON_CLK_NXP)		+= nxp/
> +obj-$(CONFIG_ARCH_ACTIONS)		+= owl/
>  obj-$(CONFIG_MACH_PISTACHIO)		+= pistachio/
>  obj-$(CONFIG_COMMON_CLK_PXA)		+= pxa/
>  obj-$(CONFIG_COMMON_CLK_QCOM)		+= qcom/
> diff --git a/drivers/clk/owl/Makefile b/drivers/clk/owl/Makefile
> new file mode 100644
> index 0000000..dbba0af
> --- /dev/null
> +++ b/drivers/clk/owl/Makefile
> @@ -0,0 +1,2 @@
> +obj-y				+= clk.o clk-pll.o clk-factor.o
> +obj-$(CONFIG_ARCH_ACTIONS)	+= clk-s900.o

$(CONFIG_ARCH_ACTIONS) is superfluous here.

> diff --git a/drivers/clk/owl/clk-factor.c b/drivers/clk/owl/clk-factor.c
> new file mode 100644
> index 0000000..6429acd
> --- /dev/null
> +++ b/drivers/clk/owl/clk-factor.c
> @@ -0,0 +1,270 @@
> +/*
> + * Copyright (c) 2014 Actions Semi Inc.
> + * David Liu <liuwei@...ions-semi.com>
> + *
> + * Copyright (c) 2017 Linaro Ltd.
> + * Author: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
> + *
> + * This program is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License v2 as published by
> + * the Free Software Foundation.

I had found that S500 code was licensed under GPLv2+ but some S900 parts
were GPLv2 only. I personally have a bias towards GPLv2+ - any chance we
can use that here?

Implementation not yet reviewed.

Regards,
Andreas

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