linux-kernel - [PATCH 0/2] rtc: pcf85363: add support for high-impedance output

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Date:   Wed, 25 Oct 2023 18:21:53 +0200
From:   Javier Carrasco <javier.carrasco@...fvision.net>
To:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>
Cc:     linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Javier Carrasco <javier.carrasco@...fvision.net>
Subject: [PATCH 0/2] rtc: pcf85363: add support for high-impedance output

This series adds support for the high-impedance (hi-Z) output mode. The
current implementation only allows two output modes: output clock
(default) and interrupt. In cases where the output is only used in
low-power modes as a clock source for other devices (PMU, PMIC, etc)
or the output is not needed at all, the hi-Z can be used to reduce power
consumption.

To model the hi-Z output, a new property "hiz-output" has been added and
the following cases have been taken into account:
- hiz-output = enabled: the output is not available in the design and
  must be kept in high-impedance mode.
- hiz-output = sleep: the output is only required in sleep (low-power)
  mode.
- hiz-output = disabled (default): for the sake of completion, this mode
  ignores the hiz-output altogether and acts as if the property was not
  defined.

Any other value will trigger a dev_warn and the default value (disabled)
will be used as it is done with other non-mandatory properties.

Signed-off-by: Javier Carrasco <javier.carrasco@...fvision.net>
---
Javier Carrasco (2):
      rtc: pcf85363: add support for high-impedance output
      dt-bindings: rtc: nxp,pcf8563: add hiz-output property

 .../devicetree/bindings/rtc/nxp,pcf85363.yaml      | 14 +++++
 drivers/rtc/rtc-pcf85363.c                         | 62 +++++++++++++++++++++-
 2 files changed, 75 insertions(+), 1 deletion(-)
---
base-commit: cfb67623ce281e045ec11e3eddb1b68b879b53a1
change-id: 20231024-topic-pcf85363_hiz_output-d9c3c1f5ae59

Best regards,
-- 
Javier Carrasco <javier.carrasco@...fvision.net>