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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20231024-topic-pcf85363_hiz_output-v1-1-50908aff0e52@wolfvision.net> References: <20231024-topic-pcf85363_hiz_output-v1-0-50908aff0e52@wolfvision.net> In-Reply-To: <20231024-topic-pcf85363_hiz_output-v1-0-50908aff0e52@wolfvision.net> To: Alessandro Zummo , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Javier Carrasco X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1698250918; l=4421; i=javier.carrasco@wolfvision.net; s=20230509; h=from:subject:message-id; bh=FF2xr2kA4qsEIO3Vzgxe9YV6LCFr1AZBTHkk4R/7HSw=; b=NL8dEBmMmFEa4v289RMS3qED08d9Bi/PNAHgRlAgMm560xhjgannG3JAEDYQksbycB7EpeQ8j hlUnaI2kB/ECNODS+DQ7m8sHctxJ4H4LsRTmEYmU7SFc0YocF86r7+Z X-Developer-Key: i=javier.carrasco@wolfvision.net; a=ed25519; pk=tIGJV7M+tCizagNijF0eGMBGcOsPD+0cWGfKjl4h6K8= X-ClientProxiedBy: VI1PR0102CA0040.eurprd01.prod.exchangelabs.com (2603:10a6:803::17) To VE1PR08MB4974.eurprd08.prod.outlook.com (2603:10a6:803:111::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VE1PR08MB4974:EE_|VI1PR08MB5376:EE_ X-MS-Office365-Filtering-Correlation-Id: 0639ebf5-d03f-4861-eb3e-08dbd576835c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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This mode can be used to reduce power consumption in applications where the RTC output is only required as a clock/interrupt source when the system runs in low-power mode (i.e. serving as a clock source for a PMU when the system is down). If the output is not needed, it can also be completely disabled. This implementation adds support for a hi-Z output and also uses simple pm operations (suspend and resume) to switch the output mode from hi-Z in normal operation to the required operation mode in sleep mode (currently either clock or interrupt) if the "sleep" value for the hiz-output was set. In order to make use of the hi-Z output modeling via device tree, check if the new "hiz-output" property is defined and set the hi-Z mode accordingly. Signed-off-by: Javier Carrasco --- drivers/rtc/rtc-pcf85363.c | 62 ++++++++++++++++++++++++++++++++++++++++++= +++- 1 file changed, 61 insertions(+), 1 deletion(-) diff --git a/drivers/rtc/rtc-pcf85363.c b/drivers/rtc/rtc-pcf85363.c index 540042b9eec8..82eaf8de8b33 100644 --- a/drivers/rtc/rtc-pcf85363.c +++ b/drivers/rtc/rtc-pcf85363.c @@ -110,9 +110,17 @@ =20 #define NVRAM_SIZE 0x40 =20 +enum pcf85363_hiz_output_t { + PCF85363_HIZ_OFF, + PCF85363_HIZ_ON, + PCF85363_HIZ_SLEEP, +}; + struct pcf85363 { struct rtc_device *rtc; struct regmap *regmap; + + enum pcf85363_hiz_output_t hiz_output; }; =20 struct pcf85x63_config { @@ -403,6 +411,7 @@ static int pcf85363_probe(struct i2c_client *client) }; int ret, i, err; bool wakeup_source; + const char *hiz_output =3D NULL; =20 if (data) config =3D data; @@ -433,9 +442,32 @@ static int pcf85363_probe(struct i2c_client *client) pcf85363->rtc->range_min =3D RTC_TIMESTAMP_BEGIN_2000; pcf85363->rtc->range_max =3D RTC_TIMESTAMP_END_2099; =20 + if (device_property_present(&client->dev, "hiz-output")) { + ret =3D device_property_read_string(&client->dev, "hiz-output", + &hiz_output); + if (ret) + return ret; + + if (!strcmp(hiz_output, "enabled")) { + pcf85363->hiz_output =3D PCF85363_HIZ_ON; + } else if (!strcmp(hiz_output, "sleep")) { + pcf85363->hiz_output =3D PCF85363_HIZ_SLEEP; + } else if (!strcmp(hiz_output, "disabled")) { + pcf85363->hiz_output =3D PCF85363_HIZ_OFF; + } else { + dev_warn(&client->dev, "Unknown hiz-output: %s. Assuming disabled", + hiz_output); + pcf85363->hiz_output =3D PCF85363_HIZ_OFF; + } + } else { + pcf85363->hiz_output =3D PCF85363_HIZ_OFF; + } wakeup_source =3D device_property_read_bool(&client->dev, "wakeup-source"); - if (client->irq > 0 || wakeup_source) { + if (pcf85363->hiz_output !=3D PCF85363_HIZ_OFF) { + regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO, + PIN_IO_INTAPM, PIN_IO_INTA_HIZ); + } else if (client->irq > 0 || wakeup_source) { regmap_write(pcf85363->regmap, CTRL_FLAGS, 0); regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO, PIN_IO_INTAPM, PIN_IO_INTA_OUT); @@ -474,6 +506,31 @@ static int pcf85363_probe(struct i2c_client *client) return ret; } =20 +#ifdef CONFIG_PM_SLEEP +static int pcf85363_suspend(struct device *dev) +{ + struct pcf85363 *pcf85363 =3D dev_get_drvdata(dev); + + if (pcf85363->hiz_output =3D=3D PCF85363_HIZ_SLEEP) + regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO, PIN_IO_INTAPM, + device_may_wakeup(dev) ? PIN_IO_INTA_OUT : + PIN_IO_INTA_CLK); + + return 0; +} + +static int pcf85363_resume(struct device *dev) +{ + struct pcf85363 *pcf85363 =3D dev_get_drvdata(dev); + + if (pcf85363->hiz_output =3D=3D PCF85363_HIZ_SLEEP) + regmap_update_bits(pcf85363->regmap, CTRL_PIN_IO, + PIN_IO_INTAPM, PIN_IO_INTA_HIZ); + + return 0; +} +#endif + static const __maybe_unused struct of_device_id dev_ids[] =3D { { .compatible =3D "nxp,pcf85263", .data =3D &pcf_85263_config }, { .compatible =3D "nxp,pcf85363", .data =3D &pcf_85363_config }, @@ -481,9 +538,12 @@ static const __maybe_unused struct of_device_id dev_id= s[] =3D { }; MODULE_DEVICE_TABLE(of, dev_ids); =20 +static SIMPLE_DEV_PM_OPS(pcf85363_pm_ops, pcf85363_suspend, pcf85363_resum= e); + static struct i2c_driver pcf85363_driver =3D { .driver =3D { .name =3D "pcf85363", + .pm =3D &pcf85363_pm_ops, .of_match_table =3D of_match_ptr(dev_ids), }, .probe =3D pcf85363_probe, --=20 2.39.2 From nobody Wed Dec 17 11:37:46 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EF9C7C0032E for ; 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charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20231024-topic-pcf85363_hiz_output-v1-2-50908aff0e52@wolfvision.net> References: <20231024-topic-pcf85363_hiz_output-v1-0-50908aff0e52@wolfvision.net> In-Reply-To: <20231024-topic-pcf85363_hiz_output-v1-0-50908aff0e52@wolfvision.net> To: Alessandro Zummo , Alexandre Belloni , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: linux-rtc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, Javier Carrasco X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1698250918; l=2113; i=javier.carrasco@wolfvision.net; s=20230509; h=from:subject:message-id; bh=rqDdWYoPOl/WqKlVTb3ATpZe4jxSW4DUjdgvmC9BmGg=; b=S8MFlT+EJBnhx+hltMYRFhalHnII5UAvH7GJJKGI8jetvw3yXZ827Ae8xqMEzvzC10fJpYByw 0dMSKVyyzkAAcd2YPU4rYGn/ZM/gDu499JrYK2JmsyGgO/UJ5B0HZfk X-Developer-Key: i=javier.carrasco@wolfvision.net; a=ed25519; pk=tIGJV7M+tCizagNijF0eGMBGcOsPD+0cWGfKjl4h6K8= X-ClientProxiedBy: VI1PR0102CA0040.eurprd01.prod.exchangelabs.com (2603:10a6:803::17) To VE1PR08MB4974.eurprd08.prod.outlook.com (2603:10a6:803:111::15) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VE1PR08MB4974:EE_|VI1PR08MB5376:EE_ X-MS-Office365-Filtering-Correlation-Id: f41c3f1c-5771-467c-37f9-08dbd576838a X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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This property is optional and if it is not defined, the output will either act as an output clock (default mode) or as an interrupt depending on the configuration set by other properties. Two modes are defined in case the high-impedance is used: "enabled" and "sleep". The former disables the RTC output completely while the latter keeps the RTC output disabled until the system enters in sleep mode. This option is especially relevant if the output clock is used to feed a PMU, a PMIC or any other device required to run when the rest of the system is down. For the sake of completeness, a "disabled" mode has been added, which acts as if the property was not defined. Document "hiz-output" as a non-required property. Signed-off-by: Javier Carrasco --- Documentation/devicetree/bindings/rtc/nxp,pcf85363.yaml | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/Documentation/devicetree/bindings/rtc/nxp,pcf85363.yaml b/Docu= mentation/devicetree/bindings/rtc/nxp,pcf85363.yaml index 52aa3e2091e9..4b27a9154191 100644 --- a/Documentation/devicetree/bindings/rtc/nxp,pcf85363.yaml +++ b/Documentation/devicetree/bindings/rtc/nxp,pcf85363.yaml @@ -36,6 +36,19 @@ properties: enum: [6000, 7000, 12500] default: 7000 =20 + hiz-output: + description: + Use enabled if the output should stay in high-impedance. This + mode will mask the output as an interrupt source. + Use sleep if the otuput should be only active in sleep mode. + This mode is compatible with any other output configuration. + The disabled value acts as if the property was not defined. + enum: + - enabled + - sleep + - disabled + default: disabled + start-year: true wakeup-source: true =20 @@ -56,5 +69,6 @@ examples: reg =3D <0x51>; #clock-cells =3D <0>; quartz-load-femtofarads =3D <12500>; + hiz-output =3D "sleep"; }; }; --=20 2.39.2