linux-kernel - Re: [PATCH v4 07/13] ARM: dts: rockchip: add clocks in vop iommu nodes

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Date:   Fri, 19 Jan 2018 14:12:39 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     JeffyChen <jeffy.chen@...k-chips.com>
Cc:     linux-kernel@...r.kernel.org, Ricky Liang <jcliang@...omium.org>,
        Robin Murphy <robin.murphy@....com>,
        simon xue <xxm@...k-chips.com>, devicetree@...r.kernel.org,
        Heiko Stuebner <heiko@...ech.de>,
        "open list:ARM/Rockchip SoC..." <linux-rockchip@...ts.infradead.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Russell King <linux@...linux.org.uk>,
        "list@....net:IOMMU DRIVERS" <iommu@...ts.linux-foundation.org>,
        Joerg Roedel <joro@...tes.org>,
        "list@....net:IOMMU DRIVERS <iommu@...ts.linux-foundation.org>, Joerg
        Roedel <joro@...tes.org>," <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v4 07/13] ARM: dts: rockchip: add clocks in vop iommu nodes

On Fri, Jan 19, 2018 at 1:55 PM, JeffyChen <jeffy.chen@...k-chips.com> wrote:
> Hi Tomasz,
>
> Thanks for your reply.
>
>
> On 01/19/2018 11:23 AM, Tomasz Figa wrote:
>>
>> On Thu, Jan 18, 2018 at 8:52 PM, Jeffy Chen <jeffy.chen@...k-chips.com>
>> wrote:
>>>
>>> Add clocks in vop iommu nodes, since we are going to control clocks in
>>> rockchip iommu driver.
>>>
>>> Signed-off-by: Jeffy Chen <jeffy.chen@...k-chips.com>
>>> ---
>>>
>>> Changes in v4: None
>>> Changes in v3: None
>>> Changes in v2: None
>>>
>>>   arch/arm/boot/dts/rk3036.dtsi | 2 ++
>>>   arch/arm/boot/dts/rk3288.dtsi | 4 ++++
>>>   2 files changed, 6 insertions(+)
>>>
>>> diff --git a/arch/arm/boot/dts/rk3036.dtsi
>>> b/arch/arm/boot/dts/rk3036.dtsi
>>> index 3b704cfed69a..95b0ebc7a40f 100644
>>> --- a/arch/arm/boot/dts/rk3036.dtsi
>>> +++ b/arch/arm/boot/dts/rk3036.dtsi
>>> @@ -197,6 +197,8 @@
>>>                  reg = <0x10118300 0x100>;
>>>                  interrupts = <GIC_SPI 43 IRQ_TYPE_LEVEL_HIGH>;
>>>                  interrupt-names = "vop_mmu";
>>> +               clocks = <&cru ACLK_LCDC>, <&cru SCLK_LCDC>, <&cru
>>> HCLK_LCDC>;
>>> +               clock-names = "aclk_vop", "dclk_vop", "hclk_vop";
>>
>>
>> We should remove clock-names from IOMMU nodes. The Rockchip IOMMU
>> bindings don't define clock names and only the clocks property should
>> be given.
>>
> hmmm, i'm trying to switch to clk_bulk APIs, the get and put are name based.
> or maybe i can use clk_get/put along with other clk_bulk APIs

I think it should be possible to just put the clock pointers to the
clk_bulk_data struct manually. Otherwise, I'm not sure what names we
could use for clock-names, since the clocks depend on master.
(Something like "clock0, clock1, clock2, ..., clockN" could work, but
it doesn't add any value IMHO...).