From mboxrd@z Thu Jan 1 00:00:00 1970 From: t.figa@samsung.com (Tomasz Figa) Date: Tue, 18 Mar 2014 14:07:51 +0100 Subject: [PATCH v11 15/27] iommu/exynos: use convenient macro to handle gate clocks In-Reply-To: References: <20140314140951.3d443a3096e80297c9fecef0@samsung.com> <5323078E.4060903@samsung.com> <20140318200329.cc1dca7541b4b1916e5d9d48@samsung.com> Message-ID: <53284527.8010903@samsung.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 18.03.2014 12:18, Sachin Kamat wrote: > On 18 March 2014 16:33, Cho KyongHo wrote: >> On Fri, 14 Mar 2014 22:27:59 +0530, Sachin Kamat wrote: >>> Hi KyongHo, >>> >>> On 14 March 2014 19:13, Tomasz Figa 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 >>>>> --- >>>>> 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. >>> >> >> Are you concerning about using macros or more insertions than deletions? > > It is just making the code more difficult to read and understand. Especially when hiding accesses to struct fields inside and doing fancy stuff like concatenations. Best regards, Tomasz