linux-kernel - Re: [PATCH v11 15/27] iommu/exynos: use convenient macro to handle gate clocks

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Message-ID: <CAK9yfHx_=Os1G46nNO1HDA3tigkRNeHKN1KGCvuN=w7dRTkfjg@mail.gmail.com>
Date:	Fri, 14 Mar 2014 22:27:59 +0530
From:	Sachin Kamat <sachin.kamat@...aro.org>
To:	Tomasz Figa <t.figa@...sung.com>
Cc:	Cho KyongHo <pullip.cho@...sung.com>,
	Linux ARM Kernel <linux-arm-kernel@...ts.infradead.org>,
	Linux DeviceTree <devicetree@...r.kernel.org>,
	Linux IOMMU <iommu@...ts.linux-foundation.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux Samsung SOC <linux-samsung-soc@...r.kernel.org>,
	Antonios Motakis <a.motakis@...tualopensystems.com>,
	Grant Grundler <grundler@...omium.org>,
	Joerg Roedel <joro@...tes.org>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Prathyush <prathyush.k@...sung.com>,
	Rahul Sharma <rahul.sharma@...sung.com>,
	Sylwester Nawrocki <s.nawrocki@...sung.com>,
	Varun Sethi <Varun.Sethi@...escale.com>
Subject: Re: [PATCH v11 15/27] iommu/exynos: use convenient macro to handle
 gate clocks

 Hi KyongHo,

On 14 March 2014 19:13, Tomasz Figa <t.figa@...sung.com> wrote:
> Hi KyongHo,
>
>
> On 14.03.2014 06:09, Cho KyongHo wrote:
>>
>> exynos-iommu driver must care about master H/W's gate clock as well as
>> System MMU's gate clock. To enhance readability of the source code,
>> macros to gate/ungate those clocks are defined.
>>
>> Signed-off-by: Cho KyongHo <pullip.cho@...sung.com>
>> ---
>>   drivers/iommu/exynos-iommu.c |   34 ++++++++++++++++++++++------------
>>   1 file changed, 22 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/iommu/exynos-iommu.c b/drivers/iommu/exynos-iommu.c
>> index 71e77f1..cef62d0 100644
>> --- a/drivers/iommu/exynos-iommu.c
>> +++ b/drivers/iommu/exynos-iommu.c
>> @@ -101,6 +101,16 @@
>>   #define REG_PB1_SADDR         0x054
>>   #define REG_PB1_EADDR         0x058
>>
>> +#define __clk_gate_ctrl(data, clk, en) do {            \
>> +               if (data->clk)                          \
>> +                       clk_##en##able(data->clk);      \
>> +       } while (0)
>> +
>> +#define __sysmmu_clk_enable(data)      __clk_gate_ctrl(data, clk, en)
>> +#define __sysmmu_clk_disable(data)     __clk_gate_ctrl(data, clk, dis)
>> +#define __master_clk_enable(data)      __clk_gate_ctrl(data, clk_master,
>> en)
>> +#define __master_clk_disable(data)     __clk_gate_ctrl(data, clk_master,
>> dis)
>> +
>
>
> I'd say that such macros only obfuscate code, without any gains, as you can
> see in diffstat - this patch adds more lines than it removes.
>
> Please drop this change.

 I agree with Tomasz here.


-- 
With warm regards,
Sachin
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