linux-kernel - Re: [PATCH V1 3/9] clk: sprd: add gate clock support

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Date:   Thu, 22 Jun 2017 18:16:39 +0800
From:   Chunyan Zhang <zhang.lyra@...il.com>
To:     Stephen Boyd <sboyd@...eaurora.org>
Cc:     Chunyan Zhang <chunyan.zhang@...eadtrum.com>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>, linux-clk@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>,
        Xiaolong Zhang <xiaolong.zhang@...eadtrum.com>,
        Orson Zhai <orson.zhai@...eadtrum.com>,
        Geng Ren <geng.ren@...eadtrum.com>,
        Ben Li <ben.li@...eadtrum.com>
Subject: Re: [PATCH V1 3/9] clk: sprd: add gate clock support

On 20 June 2017 at 09:31, Stephen Boyd <sboyd@...eaurora.org> wrote:
> On 06/18, Chunyan Zhang wrote:
>> diff --git a/drivers/clk/sprd/Makefile b/drivers/clk/sprd/Makefile
>> index 8f802b2..333e2b2 100644
>> --- a/drivers/clk/sprd/Makefile
>> +++ b/drivers/clk/sprd/Makefile
>> @@ -1,3 +1,3 @@
>>  ifneq ($(CONFIG_OF),)
>> -obj-y        += ccu_common.o
>> +obj-y        += ccu_common.o ccu_gate.o
>
> Can this be built as a module?

Since most of all Spreadtrum device drivers would depend on if clocks
have been initialized, so we'd prefer to build this into the kernel
image.

>
>>  endif
>> diff --git a/drivers/clk/sprd/ccu_gate.c b/drivers/clk/sprd/ccu_gate.c
>> new file mode 100644
>> index 0000000..3d27615
>> --- /dev/null
>> +++ b/drivers/clk/sprd/ccu_gate.c
>> @@ -0,0 +1,102 @@
>> +/*
>> + * Spreadtrum gate clock driver
>> + *
>> + * Copyright (C) 2017 Spreadtrum, Inc.
>> + *
>> + * SPDX-License-Identifier: GPL-2.0
>> + */
>> +
>> +#include <linux/clk-provider.h>
>> +
>> +#include "ccu_gate.h"
>> +
>> +DEFINE_SPINLOCK(gate_lock);
>
> This variable name is not very unique for debugging lockdep
> reports. Probably needs 'sprd' in the name.

Ok.

Thank you for your comments,
Chunyan

>
> --
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project