linux-kernel - [PATCH 2/6] twl-core: add power off implementation for twl603x

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Message-Id: <20231125092938.16535-3-andreas@kemnade.info>
Date:   Sat, 25 Nov 2023 10:29:34 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     lee@...nel.org, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        bcousson@...libre.com, tony@...mide.com, andreas@...nade.info,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-omap@...r.kernel.org
Subject: [PATCH 2/6] twl-core: add power off implementation for twl603x

If the system-power-controller property is there, enable power off.
Implementation is based on a Linux v3.0 vendor kernel.

Signed-off-by: Andreas Kemnade <andreas@...nade.info>
---
 drivers/mfd/twl-core.c  | 34 ++++++++++++++++++++++++++++++++++
 include/linux/mfd/twl.h |  1 +
 2 files changed, 35 insertions(+)

diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index 6e384a79e3418..3eef285eac535 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -687,6 +687,31 @@ static void twl_remove(struct i2c_client *client)
 	twl_priv->ready = false;
 }
 
+void twl6030_power_off(void)
+{
+#define APP_DEVOFF      (1<<0)
+#define CON_DEVOFF      (1<<1)
+#define MOD_DEVOFF      (1<<2)
+
+	int err;
+	u8 val;
+
+	err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
+			      TWL6030_PHOENIX_DEV_ON);
+	if (err) {
+		pr_err("I2C error %d reading PHOENIX_DEV_ON\n", err);
+		return;
+	}
+
+	val |= APP_DEVOFF | CON_DEVOFF | MOD_DEVOFF;
+
+	err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val,
+			       TWL6030_PHOENIX_DEV_ON);
+	if (err)
+		pr_err("TWL6030 Unable to power off\n");
+}
+
+
 static struct of_dev_auxdata twl_auxdata_lookup[] = {
 	OF_DEV_AUXDATA("ti,twl4030-gpio", 0, "twl4030-gpio", NULL),
 	{ /* sentinel */ },
@@ -852,6 +877,15 @@ twl_probe(struct i2c_client *client)
 			goto free;
 	}
 
+	if (twl_class_is_6030()) {
+		if (of_device_is_system_power_controller(client->dev.of_node)) {
+			if (!pm_power_off)
+				pm_power_off = twl6030_power_off;
+			else
+				dev_warn(&client->dev, "Poweroff callback already assigned\n");
+		}
+	}
+
 	status = of_platform_populate(node, NULL, twl_auxdata_lookup,
 				      &client->dev);
 
diff --git a/include/linux/mfd/twl.h b/include/linux/mfd/twl.h
index c062d91a67d92..85dc406173dba 100644
--- a/include/linux/mfd/twl.h
+++ b/include/linux/mfd/twl.h
@@ -461,6 +461,7 @@ static inline int twl6030_mmc_card_detect(struct device *dev, int slot)
 
 #define TWL4030_PM_MASTER_GLOBAL_TST		0xb6
 
+#define TWL6030_PHOENIX_DEV_ON                  0x06
 /*----------------------------------------------------------------------*/
 
 /* Power bus message definitions */
-- 
2.39.2