Re: [PATCH v3 3/5] ARM: dts: DRA7: Add TBCLK for PWMSS

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 




On 03/01/2016 01:23 AM, Tony Lindgren wrote:
* Franklin S Cooper Jr <fcooper@xxxxxx> [160225 14:37]:
From: Vignesh R <vigneshr@xxxxxx>

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.

Yeah, we have been discussing this offline a bit, but haven't had time to look at this. I believe the hwmod clock conversion is of higher priority still.

-Tero



Regards,

Tony

--- 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


--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]
  Powered by Linux