Re: [PATCH v3 3/5] ARM: dts: DRA7: Add TBCLK for PWMSS
From: Tony Lindgren <tony@atomide.com>
Date: 2016-02-29 23:23:53
Also in:
linux-arm-kernel, linux-clk, linux-devicetree, linux-pwm, lkml
* Franklin S Cooper Jr [off-list ref] [160225 14:37]:
From: Vignesh R <vigneshr@ti.com> tbclk is used by ehrpwm to generate PWM waveform on DRA7 SoC. Add Linux clock to control ehrpwm tbclk. The TRM says, tbclk is derived from SYSCLKOUT. SYSCLKOUT is nothing but ehrpwm functional clock derived from the gateable interface and functional clock of PWMSS(l4_root_clk_div). Refer AM57x TRM SPRUHZ6[1], October 2014, Table 29-4 and Section 29.2.2.1, Table 29-19 and the NOTE at the end of the table. [1] www.ti.com/lit/ug/spruhz6/spruhz6.pdf
Applying this into omap-for-v4.6/dt thanks. Note for Tero, let's plan on getting rid of the duplicate reg entries by using the standard clock output offset within the clock register. I think we should easily be able to add a binding for this and then deprecate the overlapping reg entries. Regards, Tony
quoted hunk ↗ jump to hunk
--- a/arch/arm/boot/dts/dra7xx-clocks.dtsi +++ b/arch/arm/boot/dts/dra7xx-clocks.dtsi@@ -2146,4 +2146,28 @@ ti,bit-shift = <0>; reg = <0x558>; }; + + 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>; + }; };-- 2.7.0