[PATCH v2 7/7] riscv: Update SiFive device tree for new CLINT driver

[Sean Anderson]

On 8/18/20 5:22 AM, Bin Meng wrote:
> +Anup Patel
> 
> On Wed, Jul 29, 2020 at 5:57 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.
>>
>> Changes in v2:
>> - Fix SiFive CLINT not getting tick-rate from rtcclk
>>
>>  arch/riscv/dts/fu540-c000-u-boot.dtsi           | 8 ++++++--
>>  arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi | 4 ++++
>>  2 files changed, 10 insertions(+), 2 deletions(-)
>>
>> diff --git a/arch/riscv/dts/fu540-c000-u-boot.dtsi b/arch/riscv/dts/fu540-c000-u-boot.dtsi
>> index afdb4f4402..f126d3e0b3 100644
>> --- a/arch/riscv/dts/fu540-c000-u-boot.dtsi
>> +++ b/arch/riscv/dts/fu540-c000-u-boot.dtsi
>> @@ -53,9 +53,13 @@
>>                         reg = <0x0 0x10070000 0x0 0x1000>;
>>                         fuse-count = <0x1000>;
>>                 };
>> -               clint at 2000000 {
>> +               clint: 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>;
>>                         u-boot,dm-spl;
>>                 };
>> diff --git a/arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi b/arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi
>> index e037150520..3275bb1f12 100644
>> --- a/arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi
>> +++ b/arch/riscv/dts/hifive-unleashed-a00-u-boot.dtsi
>> @@ -26,6 +26,10 @@
>>
>>  };
>>
>> +&clint {
>> +       clocks = <&rtcclk>;
>> +};
> 
> Can we consider making this property a standard property by the kernel
> upstream? How does the kernel CLINT timer driver determine its running
> frequency?

Currently it gets it from /cpus/timebase-frequency.

--Sean