On Fri, 14 Mar 2014 22:27:59 +0530, Sachin Kamat wrote:
> Hi KyongHo,
>
> On 14 March 2014 19:13, Tomasz Figa <t.figa@xxxxxxxxxxx> 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@xxxxxxxxxxx>
> >> ---
> >> 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?
The deletions in this patch are only clk_enable() and clk_disable()
but they must be
"if (!IS_ERR(clk)) clk_enable(clk)" and "if (!IS_ERR(clk)) clk_disable(clk)".
I think use of macro is fancier in that case.
Thank you.
KyongHo.
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