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Date: Wed, 27 Aug 2014 12:22:01 +0100
From: Ben Dooks <ben.dooks@...ethink.co.uk>
To: Doug Anderson <dianders@...omium.org>,
Chris Zhong <zyw@...k-chips.com>
CC: 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>,
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>,
Heiko Stübner <heiko@...ech.de>,
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
On 26/08/14 19:02, Doug Anderson wrote:
> Chris,
>
> On Tue, Aug 26, 2014 at 7:16 AM, Chris Zhong <zyw@...k-chips.com> wrote:
>> Signed-off-by: Chris Zhong <zyw@...k-chips.com>
>>
>> ---
>>
>> Changes in v6:
>> Adviced by doug
>> - use correct argument call of_clk_add_provider in probe
>>
>> Changes in v5:
>> Adviced by doug
>> - add some error checking in probe
>> - move "rockchip,rk808.h" into the patch about dt-bindings
>>
>> Changes in v4:
>> Adviced by doug
>> - add "clock-output-names" propertiey
>> - add a header file "rockchip,rk808.h"
>>
>> Changes in v3:
>> - fix compile err
>>
>> Changes in v2:
>> Adviced by javier.martinez
>> - separated from rtc-rk808.
>>
>> drivers/clk/Kconfig | 9 +++
>> drivers/clk/Makefile | 1 +
>> drivers/clk/clk-rk808.c | 163 +++++++++++++++++++++++++++++++++++++++++++++++
>> 3 files changed, 173 insertions(+)
>> create mode 100644 drivers/clk/clk-rk808.c
>>
>> diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
>> index cfd3af7..84e0590 100644
>> --- a/drivers/clk/Kconfig
>> +++ b/drivers/clk/Kconfig
>> @@ -38,6 +38,15 @@ config COMMON_CLK_MAX77686
>> ---help---
>> This driver supports Maxim 77686 crystal oscillator clock.
>>
>> +config COMMON_CLK_RK808
>> + tristate "Clock driver for RK808"
>> + depends on MFD_RK808
>> + ---help---
>> + This driver supports RK808 crystal oscillator clock. These
>> + multi-function devices have two fixed-rate oscillators,
>> + clocked at 32KHz each. Clkout1 is always on, Clkout2 can off
>> + by control register.
>> +
>> config COMMON_CLK_SI5351
>> tristate "Clock driver for SiLabs 5351A/B/C"
>> depends on I2C
>> diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
>> index f537a0b..99f53d5 100644
>> --- a/drivers/clk/Makefile
>> +++ b/drivers/clk/Makefile
>> @@ -28,6 +28,7 @@ obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o
>> obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o
>> obj-$(CONFIG_COMMON_CLK_PALMAS) += clk-palmas.o
>> obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o
>> +obj-$(CONFIG_COMMON_CLK_RK808) += clk-rk808.o
>> obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o
>> obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o
>> obj-$(CONFIG_COMMON_CLK_SI570) += clk-si570.o
>> 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?
--
Ben Dooks http://www.codethink.co.uk/
Senior Engineer Codethink - Providing Genius
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