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

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Message-id: <5323078E.4060903@samsung.com>
Date:	Fri, 14 Mar 2014 14:43:42 +0100
From:	Tomasz Figa <t.figa@...sung.com>
To:	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>
Cc:	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>,
	Sachin Kamat <sachin.kamat@...aro.org>,
	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 14.03.2014 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.

Best regards,
Tomasz
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