linux-kernel - Re: [PATCH 3/5] ARM: dts: DRA7: Add TBCLK for PWMSS

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Message-ID: <556D9220.8050205@ti.com>
Date:	Tue, 2 Jun 2015 16:53:12 +0530
From:	Vignesh R <vigneshr@...com>
To:	Tero Kristo <t-kristo@...com>, Paul Walmsley <paul@...an.com>,
	Thierry Reding <thierry.reding@...il.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Benoit Cousson <bcousson@...libre.com>,
	Tony Lindgren <tony@...mide.com>,
	Russell King <linux@....linux.org.uk>,
	Mike Turquette <mturquette@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>
CC:	<linux-pwm@...r.kernel.org>, <devicetree@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-clk@...r.kernel.org>
Subject: Re: [PATCH 3/5] ARM: dts: DRA7: Add TBCLK for PWMSS



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@...com>
>> ---
>>   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@...0 {
>> 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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