[PATCH 6/6] riscv: Update SiFive device tree for new CLINT driver

[Sean Anderson]

On 7/23/20 10:47 AM, Bin Meng wrote:
> Hi Sean,
> 
> On Thu, Jul 23, 2020 at 9:57 PM Sean Anderson <seanga2 at gmail.com> wrote:
>>
>> On 7/23/20 9:50 AM, Bin Meng wrote:
>>> Hi Sean,
>>>
>>> On Wed, Jul 22, 2020 at 11:51 PM Sean Anderson <seanga2 at gmail.com> wrote:
>>>>
>>>> We may need to add a clock-frequency binding like for the K210.
>>>>
>>>> Signed-off-by: Sean Anderson <seanga2 at gmail.com>
>>>> ---
>>>> This patch builds but has NOT been tested.
>>>>
>>>>  arch/riscv/dts/fu540-c000-u-boot.dtsi | 7 ++++++-
>>>>  1 file changed, 6 insertions(+), 1 deletion(-)
>>>>
>>>> diff --git a/arch/riscv/dts/fu540-c000-u-boot.dtsi b/arch/riscv/dts/fu540-c000-u-boot.dtsi
>>>> index afdb4f4402..e56bfc7595 100644
>>>> --- a/arch/riscv/dts/fu540-c000-u-boot.dtsi
>>>> +++ b/arch/riscv/dts/fu540-c000-u-boot.dtsi
>>>> @@ -55,8 +55,13 @@
>>>>                 };
>>>>                 clint at 2000000 {
>>>>                         compatible = "riscv,clint0";
>>>> -                       interrupts-extended = <&cpu0_intc 3 &cpu0_intc 7 &cpu1_intc 3 &cpu1_intc 7 &cpu2_intc 3 &cpu2_intc 7 &cpu3_intc 3 &cpu3_intc 7 &cpu4_intc 3 &cpu4_intc 7>;
>>>> +                       interrupts-extended = <&cpu0_intc 3 &cpu0_intc 7
>>>> +                                              &cpu1_intc 3 &cpu1_intc 7
>>>> +                                              &cpu2_intc 3 &cpu2_intc 7
>>>> +                                              &cpu3_intc 3 &cpu3_intc 7
>>>> +                                              &cpu4_intc 3 &cpu4_intc 7>;
>>>>                         reg = <0x0 0x2000000 0x0 0xc0000>;
>>>> +                       clocks = <&prci PRCI_CLK_COREPLL>;
>>>
>>> This looks wrong to me. The CLINT timer frequency should come from the RTC node.
>>>
>>> +Pragnesh Patel
>>>
>>> +Sagar Kadam
>>
>> On further review, I think you are right that this should be RTCCLK_FREQ.
>>
>> Perhaps the clocks part should be moved into
>> arch/riscv/dts/hifive-unleashed-a00-u-boot.dts and changed to something
>> like
>>
>> clocks = <&rtcclk>;
> 
> How does the device tree look like in the upstream Linux to work with
> the new CLINT timer driver?
> 
> Regards,
> Bin

Anup's patch doesn't change the device tree at all so I think they are still using timebase-frequency.

--Sean