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Message-ID: <20240711140843.3201530-1-valentin.caron@foss.st.com>
Date: Thu, 11 Jul 2024 16:08:39 +0200
From: Valentin Caron <valentin.caron@...s.st.com>
To: Alexandre Belloni <alexandre.belloni@...tlin.com>,
Rob Herring
<robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley
<conor+dt@...nel.org>,
Alexandre Torgue <alexandre.torgue@...s.st.com>
CC: <linux-rtc@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-stm32@...md-mailman.stormreply.com>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
Amelie Delaunay <amelie.delaunay@...s.st.com>,
Valentin Caron
<valentin.caron@...s.st.com>
Subject: [PATCH 0/4] rtc: stm32: add pinctrl interface to handle RTC outs
This series adds a pinctrl/pinmux interface to control STM32 RTC outputs.
Theses two signals output are possible:
- LSCO (Low Speed Clock Output) that allow to output LSE clock on a pin.
On STM32MPU Discovery boards, this feature is used to generate a clock
to Wifi/Bluetooth module.
- Alarm out that allow to send a pulse on a pin when alarm A of the RTC
expires.
First attempt [1] was based on 'st,' vendor properties, this one is based
on pinctrl and pinmux framework.
As device-trees will be upstreamed separately, here is an example:
stm32-pinctrl {
rtc_rsvd_pins_a: rtc-rsvd-0 {
pins {
pinmux = <STM32_PINMUX('B', 2, AF1)>, /* OUT2 */
<STM32_PINMUX('I', 8, ANALOG)>; /* OUT2_RMP */
};
};
};
stm32-rtc {
pinctrl-0 = <&rtc_rsvd_pins_a &rtc_alarma_pins_a>;
/* Enable by foo-device */
rtc_lsco_pins_a: rtc-lsco-0 {
pins = "out2_rmp";
function = "lsco";
};
/* Enable by stm32-rtc hog */
rtc_alarma_pins_a: rtc-alarma-0 {
pins = "out2";
function = "alarm-a";
};
};
foo-device {
pinctrl-0 = <&rtc_lsco_pins_a>;
};
[1] https://lore.kernel.org/linux-arm-kernel/20220504130617.331290-5-valentin.caron@foss.st.com/t/#m37935e92315e22bbe085775096175afc05b7ff09
Valentin Caron (4):
dt-bindings: rtc: stm32: describe pinmux nodes
rtc: stm32: add pinctrl and pinmux interfaces
rtc: stm32: add Low Speed Clock Output (LSCO) support
rtc: stm32: add alarm A out feature
.../devicetree/bindings/rtc/st,stm32-rtc.yaml | 28 ++
drivers/rtc/Kconfig | 1 +
drivers/rtc/rtc-stm32.c | 281 ++++++++++++++++++
3 files changed, 310 insertions(+)
--
2.25.1
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