lkml.org 
[lkml]   [2015]   [Jun]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v2 3/5] ARM: dts: DRA7: Add TBCLK for PWMSS
Date
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

Signed-off-by: Vignesh R <vigneshr@ti.com>
---

v2:
* add TRM references.

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>;
+ };
+};
--
2.4.1


\
 
 \ /
  Last update: 2015-06-03 14:41    [W:7.296 / U:0.112 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site