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[PATCH 3/9] dt-bindings: rtc: lpc32xx-rtc: move to trivial-rtc

Javier Carrasco posted 9 patches 1 year, 10 months ago
There is a newer version of this series
[PATCH 3/9] dt-bindings: rtc: lpc32xx-rtc: move to trivial-rtc
Posted by Javier Carrasco 1 year, 10 months ago 
This RTC requires a compatible, a reg and a single interrupt,
which makes it suitable for a direct conversion into trivial-rtc.

Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
---
 Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt  | 15 ---------------
 Documentation/devicetree/bindings/rtc/trivial-rtc.yaml |  2 ++
 2 files changed, 2 insertions(+), 15 deletions(-)

diff --git a/Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt b/Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt
deleted file mode 100644
index a87a1e9bc060..000000000000
--- a/Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt
+++ /dev/null
@@ -1,15 +0,0 @@
-* NXP LPC32xx SoC Real Time Clock controller
-
-Required properties:
-- compatible: must be "nxp,lpc3220-rtc"
-- reg: physical base address of the controller and length of memory mapped
-  region.
-- interrupts: The RTC interrupt
-
-Example:
-
-	rtc@40024000 {
-		compatible = "nxp,lpc3220-rtc";
-		reg = <0x40024000 0x1000>;
-		interrupts = <52 0>;
-	};
diff --git a/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml b/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml
index b889b9317a41..d6ce7ac29033 100644
--- a/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml
+++ b/Documentation/devicetree/bindings/rtc/trivial-rtc.yaml
@@ -55,6 +55,8 @@ properties:
       - microcrystal,rv3029
       # Real Time Clock
       - microcrystal,rv8523
+      # NXP LPC32xx SoC Real-time Clock
+      - nxp,lpc3220-rtc
       # Real-time Clock Module
       - pericom,pt7c4338
       # I2C bus SERIAL INTERFACE REAL-TIME CLOCK IC

-- 
2.40.1
Re: [PATCH 3/9] dt-bindings: rtc: lpc32xx-rtc: move to trivial-rtc
Posted by Krzysztof Kozlowski 1 year, 10 months ago 
On 08/04/2024 17:53, Javier Carrasco wrote:
> This RTC requires a compatible, a reg and a single interrupt,
> which makes it suitable for a direct conversion into trivial-rtc.
> 
> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
> ---
>  Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt  | 15 ---------------
>  Documentation/devicetree/bindings/rtc/trivial-rtc.yaml |  2 ++
>  2 files changed, 2 insertions(+), 15 deletions(-)

This one no... and if you tested DTS you would see errors, although you
need to test specific lpc config, not multi_v7.

It does not look like you tested the DTS against bindings. Please run
`make dtbs_check W=1` (see
Documentation/devicetree/bindings/writing-schema.rst or
https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
for instructions).

Anyway, you *must* check all DTS before moving anything to trivial.

Does it mean all other bindings were not checked against DTS at all?

Best regards,
Krzysztof
Re: [PATCH 3/9] dt-bindings: rtc: lpc32xx-rtc: move to trivial-rtc
Posted by Javier Carrasco 1 year, 10 months ago 
On 4/9/24 09:34, Krzysztof Kozlowski wrote:
> On 08/04/2024 17:53, Javier Carrasco wrote:
>> This RTC requires a compatible, a reg and a single interrupt,
>> which makes it suitable for a direct conversion into trivial-rtc.
>>
>> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
>> ---
>>  Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt  | 15 ---------------
>>  Documentation/devicetree/bindings/rtc/trivial-rtc.yaml |  2 ++
>>  2 files changed, 2 insertions(+), 15 deletions(-)
> 
> This one no... and if you tested DTS you would see errors, although you
> need to test specific lpc config, not multi_v7.
> 
> It does not look like you tested the DTS against bindings. Please run
> `make dtbs_check W=1` (see
> Documentation/devicetree/bindings/writing-schema.rst or
> https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
> for instructions).
> 
> Anyway, you *must* check all DTS before moving anything to trivial.
> 
> Does it mean all other bindings were not checked against DTS at all?
> 
> Best regards,
> Krzysztof
> 
Hi,

I did check the conversion against nxp/lpc/lpc3250-phy3250.dts, which
throws a message about the 'clocks' property.

That property is not documented in the original binding, and even though
it could be missing, I could not find any function to get a clock (i.e.
any form of clk_get()) in rtc-lpc32xx.c, which is the only file where
the compatible can be found.

Is therefore the property not useless in the dts? My apologies if I am
missing something here.

Thanks and best regards,
Javier Carrasco
Re: [PATCH 3/9] dt-bindings: rtc: lpc32xx-rtc: move to trivial-rtc
Posted by Alexandre Belloni 1 year, 10 months ago 
On 09/04/2024 10:52:54+0200, Javier Carrasco wrote:
> On 4/9/24 09:34, Krzysztof Kozlowski wrote:
> > On 08/04/2024 17:53, Javier Carrasco wrote:
> >> This RTC requires a compatible, a reg and a single interrupt,
> >> which makes it suitable for a direct conversion into trivial-rtc.
> >>
> >> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
> >> ---
> >>  Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt  | 15 ---------------
> >>  Documentation/devicetree/bindings/rtc/trivial-rtc.yaml |  2 ++
> >>  2 files changed, 2 insertions(+), 15 deletions(-)
> > 
> > This one no... and if you tested DTS you would see errors, although you
> > need to test specific lpc config, not multi_v7.
> > 
> > It does not look like you tested the DTS against bindings. Please run
> > `make dtbs_check W=1` (see
> > Documentation/devicetree/bindings/writing-schema.rst or
> > https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
> > for instructions).
> > 
> > Anyway, you *must* check all DTS before moving anything to trivial.
> > 
> > Does it mean all other bindings were not checked against DTS at all?
> > 
> > Best regards,
> > Krzysztof
> > 
> Hi,
> 
> I did check the conversion against nxp/lpc/lpc3250-phy3250.dts, which
> throws a message about the 'clocks' property.
> 
> That property is not documented in the original binding, and even though
> it could be missing, I could not find any function to get a clock (i.e.
> any form of clk_get()) in rtc-lpc32xx.c, which is the only file where
> the compatible can be found.
> 
> Is therefore the property not useless in the dts? My apologies if I am
> missing something here.

The bindings doesn't document the driver but the hardware. In this case,
the only input clock seems to be a 32kHz crystal.

> 
> Thanks and best regards,
> Javier Carrasco

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
Re: [PATCH 3/9] dt-bindings: rtc: lpc32xx-rtc: move to trivial-rtc
Posted by Krzysztof Kozlowski 1 year, 10 months ago 
On 09/04/2024 10:52, Javier Carrasco wrote:
> On 4/9/24 09:34, Krzysztof Kozlowski wrote:
>> On 08/04/2024 17:53, Javier Carrasco wrote:
>>> This RTC requires a compatible, a reg and a single interrupt,
>>> which makes it suitable for a direct conversion into trivial-rtc.
>>>
>>> Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
>>> ---
>>>  Documentation/devicetree/bindings/rtc/lpc32xx-rtc.txt  | 15 ---------------
>>>  Documentation/devicetree/bindings/rtc/trivial-rtc.yaml |  2 ++
>>>  2 files changed, 2 insertions(+), 15 deletions(-)
>>
>> This one no... and if you tested DTS you would see errors, although you
>> need to test specific lpc config, not multi_v7.
>>
>> It does not look like you tested the DTS against bindings. Please run
>> `make dtbs_check W=1` (see
>> Documentation/devicetree/bindings/writing-schema.rst or
>> https://www.linaro.org/blog/tips-and-tricks-for-validating-devicetree-sources-with-the-devicetree-schema/
>> for instructions).
>>
>> Anyway, you *must* check all DTS before moving anything to trivial.
>>
>> Does it mean all other bindings were not checked against DTS at all?
>>
>> Best regards,
>> Krzysztof
>>
> Hi,
> 
> I did check the conversion against nxp/lpc/lpc3250-phy3250.dts, which
> throws a message about the 'clocks' property.
> 
> That property is not documented in the original binding, and even though
> it could be missing, I could not find any function to get a clock (i.e.

Old bindings are not really accurate.

> any form of clk_get()) in rtc-lpc32xx.c, which is the only file where
> the compatible can be found.
> 
> Is therefore the property not useless in the dts? My apologies if I am
> missing something here.

Useless for whom? For Linux yes. For U-Boot or out-of-tree users of DTS,
I don't know. Anyway the true question is if there is a clock or there
is no. If there is a clock, then it should be in the binding even if
Linux driver does not use it.

I propose to add it and be done with it.




Best regards,
Krzysztof

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