linux-kernel - Re: [PATCH 2/2] clk: bcm63xx: Add BCM63xx gated clock support

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Message-ID: <CAGVrzcauQMk7wurw3CVG8Sh5NN1dEDLjjguuUeBxTMcozjJVCQ@mail.gmail.com>
Date:	Wed, 2 Dec 2015 10:08:39 -0800
From:	Florian Fainelli <f.fainelli@...il.com>
To:	Simon Arlott <simon@...e.lp0.eu>
Cc:	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Kevin Cernekee <cernekee@...il.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-clk@...r.kernel.org, Linux-MIPS <linux-mips@...ux-mips.org>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH 2/2] clk: bcm63xx: Add BCM63xx gated clock support

2015-11-30 12:54 GMT-08:00 Simon Arlott <simon@...e.lp0.eu>:
> The BCM63xx contains clocks gated with a register. Clocks are indexed
> by bits in the register and are active high. Clock gate bits are
> interleaved with other status bits and configurable clocks in the same
> register.
>
> Enabled by default for BMIPS_GENERIC.
>
> Signed-off-by: Simon Arlott <simon@...e.lp0.eu>
> ---

[snip]

> +
> +config CLK_BCM63XX
> +       bool "Broadcom BCM63xx clock support"
> +       depends on BMIPS_GENERIC
> +       depends on COMMON_CLK
> +       default y

default BMIPS_GENERIC?

> +       help
> +         Enable clock framework support for Broadcom 63xx SoCs
> diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
> index 3fc9506..4f5f8ce 100644
> --- a/drivers/clk/bcm/Makefile
> +++ b/drivers/clk/bcm/Makefile
> @@ -8,3 +8,4 @@ obj-$(CONFIG_COMMON_CLK_IPROC)  += clk-ns2.o
>  obj-$(CONFIG_ARCH_BCM_CYGNUS)  += clk-cygnus.o
>  obj-$(CONFIG_ARCH_BCM_NSP)     += clk-nsp.o
>  obj-$(CONFIG_ARCH_BCM_5301X)   += clk-nsp.o
> +obj-$(CONFIG_CLK_BCM63XX)      += clk-bcm63xx.o
> diff --git a/drivers/clk/bcm/clk-bcm63xx.c b/drivers/clk/bcm/clk-bcm63xx.c
> new file mode 100644
> index 0000000..0e8cc06
> --- /dev/null
> +++ b/drivers/clk/bcm/clk-bcm63xx.c

There is a pending clk-bcm63xx.c implementation, covering BCM63138 in
Stephen Boyd's clk/next tree, which you would want to base your
patches on, it is not a huge deal to resolve the conflict, and there
will be separate entry points and functions based on the compatible
string anyway...

> @@ -0,0 +1,187 @@
> +/*
> + * Copyright 2015 Simon Arlott
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * Based on clk-gate.c:
> + * Copyright (C) 2010-2011 Canonical Ltd <jeremy.kerr@...onical.com>
> + * Copyright (C) 2011-2012 Mike Turquette, Linaro Ltd <mturquette@...aro.org>
> + */

I am not really anything very specific to 63xx chips in there, in
fact, this looks like a fairly generic clk-gate driver using regmap to
get its masks and offsets, would it make sense to create
clk-gate-regmap.c which exposes the bulk of what you are doing and you
could match using a specific compatible string?
--
Florian
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