On Thu, 08 Aug 2013 13:40:13 +0200, Tomasz Figa wrote:
> On Thursday 08 of August 2013 13:17:34 Sylwester Nawrocki wrote:
> > On 08/08/2013 11:38 AM, Cho KyongHo wrote:
> > > This adds gate clocks of all System MMUs and their master IPs
> > > that are not apeared in clk-exynos5250.c
> > > Also fixes GATE_IP_ACP to 0x18800 and changed GATE_DA to GATE
> > > for System MMU clocks in clk-exynos4.c
> > >
> > > Signed-off-by: Cho KyongHo <pullip.cho@xxxxxxxxxxx>
> > > ---
> > >
> > > .../devicetree/bindings/clock/exynos5250-clock.txt | 26 +++++++++
> > > drivers/clk/samsung/clk-exynos4.c | 27 +++------
> > > drivers/clk/samsung/clk-exynos5250.c | 57
> > > ++++++++++++++++---- 3 files changed, 82 insertions(+), 28
> > > deletions(-)
> >
> > [...]
> >
> > > @@ -349,19 +358,26 @@ static struct samsung_gate_clock
> > > exynos5250_gate_clks[] __initdata = {>
> > > GATE(gscl3, "gscl3", "aclk266", GATE_IP_GSCL, 3, 0, 0),
> > > GATE(gscl_wa, "gscl_wa", "div_gscl_wa", GATE_IP_GSCL, 5, 0, 0),
> > > GATE(gscl_wb, "gscl_wb", "div_gscl_wb", GATE_IP_GSCL, 6, 0, 0),
> > >
> > > - GATE(smmu_gscl0, "smmu_gscl0", "aclk266", GATE_IP_GSCL, 7, 0, 0),
> > > - GATE(smmu_gscl1, "smmu_gscl1", "aclk266", GATE_IP_GSCL, 8, 0, 0),
> > > - GATE(smmu_gscl2, "smmu_gscl2", "aclk266", GATE_IP_GSCL, 9, 0, 0),
> > > - GATE(smmu_gscl3, "smmu_gscl3", "aclk266", GATE_IP_GSCL, 10, 0, 0),
> > > + GATE(smmu_gscl0, "smmu_gscl0", "none", GATE_IP_GSCL, 7, 0, 0),
> > > + GATE(smmu_gscl1, "smmu_gscl1", "none", GATE_IP_GSCL, 8, 0, 0),
> > > + GATE(smmu_gscl2, "smmu_gscl2", "none", GATE_IP_GSCL, 9, 0, 0),
> > > + GATE(smmu_gscl3, "smmu_gscl3", "none", GATE_IP_GSCL, 10, 0, 0),
> >
> > Why are the smmu clocks' parent clocks removed ? Shouldn't both the
> > gscaler gate clock and the gscaler smmu clock be still same, as it is in
> > case of exynos4 ?
>
> I agree with Sylwester.
>
> In fact, it is not a valid clock setup. A valid clock must be either root
> clock (indicated by appropriate clock flag and specified frequency) or have
> a valid parent.
>
I thought that it does not require parent clock since it is just a gating clock.
Let me check it again.
Thank you.
> Best regards,
> Tomasz
>
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