Re: [PATCH V3] clk: qcom: Add spmi_pmic clock divider support
From: Tirupathi Reddy T
Date: Mon Sep 18 2017 - 07:31:10 EST
On 9/13/2017 11:10 PM, Rob Herring wrote:
On Wed, Sep 06, 2017 at 05:30:07PM +0530, Tirupathi Reddy wrote:
Clkdiv module provides a clock output on the PMIC with CXO as
the source. This clock can be routed through PMIC GPIOs. Add
a device driver to configure this clkdiv module.
Signed-off-by: Tirupathi Reddy <tirupath@xxxxxxxxxxxxxx>
---
.../bindings/clock/clk-spmi-pmic-div.txt | 51 +++
drivers/clk/qcom/Kconfig | 9 +
drivers/clk/qcom/Makefile | 1 +
drivers/clk/qcom/clk-spmi-pmic-div.c | 342 +++++++++++++++++++++
4 files changed, 403 insertions(+)
create mode 100644 Documentation/devicetree/bindings/clock/clk-spmi-pmic-div.txt
create mode 100644 drivers/clk/qcom/clk-spmi-pmic-div.c
diff --git a/Documentation/devicetree/bindings/clock/clk-spmi-pmic-div.txt b/Documentation/devicetree/bindings/clock/clk-spmi-pmic-div.txt
new file mode 100644
index 0000000..8b84b32
--- /dev/null
+++ b/Documentation/devicetree/bindings/clock/clk-spmi-pmic-div.txt
@@ -0,0 +1,51 @@
+Qualcomm Technologies, Inc. SPMI PMIC clock divider (clkdiv)
+
+clkdiv configures the clock frequency of a set of outputs on the PMIC.
+These clocks are typically wired through alternate functions on
+gpio pins.
+
+=======================
+Properties
+=======================
+
+- compatible
+ Usage: required
+ Value type: <string>
+ Definition: must be one of:
+ "qcom,spmi-clkdiv"
If this is not a fallback, drop it.
Here "qcom,spmi-clkdiv" is used as generic string for registering only
one clk and
the pmic specific strings are used for registering more than one clk
following
the given base address in "reg" property.
+ "qcom,pm8998-clkdiv"
+
+- reg
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: Addresses and sizes for the memory of this CLKDIV
+ peripheral.
+
+- clocks:
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: reference to the xo clock.
+
+- clock-names:
+ Usage: required
+ Value type: <stringlist>
+ Definition: must be "xo".
Missing #clock-cells
Added in next patch set.
+
+=======
+Example
+=======
+
+pm8998_clk_divs: qcom,clkdiv@5b00 {
clock@5b00
Addressed in next patch.
+ compatible = "qcom,pm8998-clkdiv";
+ reg = <0x5b00>;
+ #clock-cells = <1>;
+ clocks = <&xo_board>;
+ clock-names = "xo";
+
+ assigned-clocks = <&pm8998_clk_divs 1>,
+ <&pm8998_clk_divs 2>,
+ <&pm8998_clk_divs 3>;
+ assigned-clock-rates = <9600000>,
+ <9600000>,
+ <9600000>;
+};