linux-kernel - Re: [PATCH V3] clk: qcom: Add spmi

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Date:   Mon, 18 Sep 2017 17:00:55 +0530
From:   Tirupathi Reddy T <tirupath@...eaurora.org>
To:     Rob Herring <robh@...nel.org>
Cc:     sboyd@...eaurora.org, mturquette@...libre.com,
        mark.rutland@....com, andy.gross@...aro.org,
        david.brown@...aro.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org
Subject: Re: [PATCH V3] clk: qcom: Add spmi_pmic clock divider support



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@...eaurora.org>
>> ---
>>   .../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@...0 {
> clock@...0
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>;
>> +};