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SubjectRe: [v3,1/2] dt-bindings: rtc: pcf85263/pcf85363: add some properties
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On 03/09/2019 08:18, Biwen Li wrote:
> diff --git a/Documentation/devicetree/bindings/rtc/pcf85363.txt b/Documentation/devicetree/bindings/rtc/pcf85363.txt
> index 94adc1cf93d9..588f688b30d1 100644
> --- a/Documentation/devicetree/bindings/rtc/pcf85363.txt
> +++ b/Documentation/devicetree/bindings/rtc/pcf85363.txt
> @@ -8,10 +8,39 @@ Required properties:
> Optional properties:
> - interrupts: IRQ line for the RTC (not implemented).
>
> +- interrupt-output-pin: The interrupt output pin must be
> + "INTA" or "INTB", default value is "INTA"
> +


The hardware has 2 interrupt pins which can be mapped to various
interrupt sources (alarm1, alarm2, periodic, ...)

Currently the driver only supports alarm1.

It is even possible to use both pins for the same interrupt (eg if INTA
were wired to the SoC, INTB to a PMIC and both used for alarm...)


So maybe it would be better to have

alarm1-interrupt-output-pin: The interrupt output pin used for the alarm
function. Must be "INTA", "INTB" or "BOTH"

Then, if and when other types of interrupts are supported by the driver
new properties could be added for them.



> +- quartz-load-femtofarads: The internal capacitor to select for the quartz:
> + PCF85263_QUARTZCAP_7pF [0]
> + PCF85263_QUARTZCAP_6pF [1]
> + PCF85263_QUARTZCAP_12p5pF [2] DEFAULT
> +


The standard DT property "quartz-load-femtofarads" takes the real
physical value in femto Farads ie values should be 7000, 6000, 12500
without defines.


> +- nxp,quartz-drive-strength: Drive strength for the quartz:
> + PCF85263_QUARTZDRIVE_100ko [0] DEFAULT
> + PCF85263_QUARTZDRIVE_60ko [1]
> + PCF85263_QUARTZDRIVE_500ko [2]
> +


Not sure about this.

Wouldn't it be better to either use a real impedence value in ohms (like
load property above, even though it is a vendor specific value) rather
than a define, or defines for "Low, Medium, High"?


Martin


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