[PATCH v2 3/9] arm: twr-k70f120m: clock driver for Kinetis SoC

[pawelo@king.net.pl (Paul Osmialowski)]

Hi Arnd,

Can you look at attached candidate for the third iteration? Is it any 
better now?

Thanks,
Paul

On Tue, 30 Jun 2015, Arnd Bergmann wrote:

> On Tuesday 30 June 2015 14:27:24 Paul Osmialowski wrote:
>> Based on K70P256M150SF3RM.pdf K70 Sub-Family Reference Manual, Rev. 3.
>>
>> Signed-off-by: Paul Osmialowski <pawelo@king.net.pl>
>> ---
>>  .../devicetree/bindings/clock/kinetis-clock.txt    |  63 +++
>>  arch/arm/boot/dts/kinetis.dtsi                     |  36 ++
>>  drivers/clk/Makefile                               |   1 +
>>  drivers/clk/clk-kinetis.c                          | 463 +++++++++++++++++++++
>>  4 files changed, 563 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/clock/kinetis-clock.txt
>>  create mode 100644 drivers/clk/clk-kinetis.c
>>
>> diff --git a/Documentation/devicetree/bindings/clock/kinetis-clock.txt b/Documentation/devicetree/bindings/clock/kinetis-clock.txt
>> new file mode 100644
>> index 0000000..63af6a5
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/clock/kinetis-clock.txt
>> @@ -0,0 +1,63 @@
>> +* Clock bindings for Freescale Kinetis SoC
>> +
>> +Required properties:
>> +- compatible: Should be "fsl,kinetis-cmu".
>> +- reg: Two address ranges, one for the Clock Genetator register set,
>> +	one for System Integration Module register set.
>> +- Set of clock devices: one fixed-rate-root, fixed-rate clocks and clock-gates.
>> +
>> +For clock-gate addresses see K70 Sub-Family Reference Manual, Rev. 3 pg. 341
>> +and later. Notice that addresses are zero-based, so SIM_SCGC1 has address 0,
>> +SIM_SCGC2 has address 1 and so on. The second address component is the bit
>> +index.
>
> Please document the sub-nodes that are allowed, and the format
> of the clock specifiers.
>
>> +
>> +Example:
>> +
>> +cmu at 40064000 {
>> +	compatible = "fsl,kinetis-cmu";
>> +	reg = <0x40064000 0x14>, <0x40047000 0x1100>;
>> +
>> +	mcg_outclk: fixed-rate-root at mcgout {
>> +		device_type = "mcgout";
>> +		#clock-cells = <0>;
>> +	};
>> +
>> +	mcg_cclk: fixed-rate at cclk {
>
> '@' is a reserved character here that is used before the address
> of the device, so this has to be a hexadecimal number without leading
> '0x', and it should match the 'reg' property of the device.
>
>> +		device_type = "cclk";
>> +		#clock-cells = <0>;
>> +		clocks = <&mcg_outclk>;
>> +	};
>
> The device_type property here is not a standard identifier,
> and you don't list it as an optional or mandatory property.
>
> Please remove it and instead use the compatible property, the
> name or the address.
>
> 	Arnd
>
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