linux-kernel - Re: [PATCH v6 4/5] clk: RK808: Add clkout driver for RK808

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Date:	Wed, 27 Aug 2014 20:32:53 +0200
From:	Heiko Stübner <heiko@...ech.de>
To:	Ben Dooks <ben.dooks@...ethink.co.uk>,
	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>
Cc:	Doug Anderson <dianders@...omium.org>,
	Chris Zhong <zyw@...k-chips.com>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	"broonie@...nel.org" <broonie@...nel.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Mike Turquette <mturquette@...aro.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	rtc-linux@...glegroups.com, Grant Likely <grant.likely@...aro.org>,
	Lin Huang <hl@...k-chips.com>,
	Tao Huang <huangtao@...k-chips.com>,
	Eddie Cai <cf@...k-chips.com>,
	zhangqing <zhangqing@...k-chips.com>, xxx <xxx@...k-chips.com>,
	Olof Johansson <olof@...om.net>,
	Sonny Rao <sonnyrao@...omium.org>,
	Dmitry Torokhov <dtor@...omium.org>,
	Javier Martinez Canillas <javier.martinez@...labora.co.uk>,
	Kever Yang <kever.yang@...k-chips.com>
Subject: Re: [PATCH v6 4/5] clk: RK808: Add clkout driver for RK808

Am Mittwoch, 27. August 2014, 12:22:01 schrieb Ben Dooks:
> >> diff --git a/drivers/clk/clk-rk808.c b/drivers/clk/clk-rk808.c
> >> new file mode 100644
> >> index 0000000..21f8b54
> >> --- /dev/null
> >> +++ b/drivers/clk/clk-rk808.c
> >> @@ -0,0 +1,163 @@
> >> +/*
> >> + * Clkout driver for Rockchip RK808
> >> + *
> >> + * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
> >> + *
> >> + * Author: Chris Zhong <zyw@...k-chips.com>
> > 
> > I probably would have removed "Author" here (like in other patches)
> > since it's below in MODULE_AUTHOR.  ...but I'm not a huge stickler for
> > it.
> > 
> >> + *
> >> + * This program is free software; you can redistribute it and/or modify
> >> it
> >> + * under the terms and conditions of the GNU General Public License,
> >> + * version 2, as published by the Free Software Foundation.
> >> + *
> >> + * This program is distributed in the hope it will be useful, but
> >> WITHOUT
> >> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> >> + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
> >> for + * more details.
> >> + */
> >> +
> >> +#include <linux/clk.h>
> >> +#include <linux/clk-provider.h>
> >> +#include <linux/module.h>
> >> +#include <linux/slab.h>
> >> +#include <linux/platform_device.h>
> >> +#include <linux/mfd/rk808.h>
> >> +#include <linux/i2c.h>
> >> +
> >> +struct rk808_clkout {
> >> +       struct rk808 *rk808;
> >> +       struct clk_onecell_data clk_data;
> >> +       struct clk_hw           clkout1_hw;
> >> +       struct clk_hw           clkout2_hw;
> >> +};
> >> +
> >> +static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
> >> +                                             unsigned long parent_rate)
> >> +{
> >> +       return 32768;
> >> +}
> >> +
> 
> Given one of these is a fixed, ungatable clock then surely it would
> be easier to use a separate fixed clock node for that and then just
> have a none for the gated clock?

Hmm, with the devicetree being supposed to describe the hardware, I guess this 
is debatable. As both clocks are provided by the rk808 chip, I guess the clock 
references for both also should point there and not some arbitary fixed clock 
somewhere else in the dt?

But this view could also be to pendantic :-) .

Maybe the dt maintainers can shed some light on this.
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