On Tuesday 02 June 2015 01:52 PM, Tero Kristo wrote:
> On 06/01/2015 02:53 PM, Vignesh R wrote:
>> tbclk is used by ehrpwm to generate PWM waveform on DRA7 SoC. Add Linux
>> clock to control ehrpwm tbclk.
>
> Care to add TRM reference here?
Ok, I will add the following reference.
tbclk is derived from SYSCLKOUT. The system clock - SYSCLKOUT is the
ePWM functional clock derived from the gateable interface and functional
clock of PWMSS.
See AM57x TRM SPRUHZ6, October 2014, Section 29.2.2.1, Table 29-19 and
the NOTE at the end of the table.
>
> -Tero
>
>>
>> Signed-off-by: Vignesh R <vigneshr@xxxxxx>
>> ---
>> arch/arm/boot/dts/dra7.dtsi | 5 +++++
>> arch/arm/boot/dts/dra7xx-clocks.dtsi | 26 ++++++++++++++++++++++++++
>> 2 files changed, 31 insertions(+)
>>
>> diff --git a/arch/arm/boot/dts/dra7.dtsi b/arch/arm/boot/dts/dra7.dtsi
>> index f03a091cd076..387c76ca41f9 100644
>> --- a/arch/arm/boot/dts/dra7.dtsi
>> +++ b/arch/arm/boot/dts/dra7.dtsi
>> @@ -131,6 +131,11 @@
>> regulator-max-microvolt = <3000000>;
>> };
>> };
>> +
>> + scm_conf_clocks: clocks {
>> + #address-cells = <1>;
>> + #size-cells = <0>;
>> + };
>> };
>>
>> dra7_pmx_core: pinmux@1400 {
>> diff --git a/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> b/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> index 3b933f74d000..92452d61cf58 100644
>> --- a/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> +++ b/arch/arm/boot/dts/dra7xx-clocks.dtsi
>> @@ -2136,3 +2136,29 @@
>> clocks = <&dpll_usb_ck>;
>> };
>> };
>> +
>> +&scm_conf_clocks {
>> + ehrpwm0_tbclk: ehrpwm0_tbclk {
>> + #clock-cells = <0>;
>> + compatible = "ti,gate-clock";
>> + clocks = <&l4_root_clk_div>;
>> + ti,bit-shift = <20>;
>> + reg = <0x0558>;
>> + };
>> +
>> + ehrpwm1_tbclk: ehrpwm1_tbclk {
>> + #clock-cells = <0>;
>> + compatible = "ti,gate-clock";
>> + clocks = <&l4_root_clk_div>;
>> + ti,bit-shift = <21>;
>> + reg = <0x0558>;
>> + };
>> +
>> + ehrpwm2_tbclk: ehrpwm2_tbclk {
>> + #clock-cells = <0>;
>> + compatible = "ti,gate-clock";
>> + clocks = <&l4_root_clk_div>;
>> + ti,bit-shift = <22>;
>> + reg = <0x0558>;
>> + };
>> +};
>>
>
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