[PATCH v4 2/5] twl-core: add power off implementation for twl603x

Andreas Kemnade
2024-02-17T08:20:46Z

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@kemnade.info>
---
drivers/mfd/twl-core.c | 28 ++++++++++++++++++++++++++++
include/linux/mfd/twl.h | 1 +
2 files changed, 29 insertions(+)

diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
index 6e384a79e3418..c130ffef182f1 100644
--- a/drivers/mfd/twl-core.c
+++ b/drivers/mfd/twl-core.c
@@ -124,6 +124,11 @@
#define TWL6030_BASEADD_RSV 0x0000
#define TWL6030_BASEADD_ZERO 0x0000

+/* Some fields in TWL6030_PHOENIX_DEV_ON */
+#define TWL6030_APP_DEVOFF BIT(0)
+#define TWL6030_CON_DEVOFF BIT(1)
+#define TWL6030_MOD_DEVOFF BIT(2)
+
/* Few power values */
#define R_CFG_BOOT 0x05

@@ -687,6 +692,20 @@ static void twl_remove(struct i2c_client *client)
twl_priv->ready = false;
}

+static void twl6030_power_off(void)
+{
+ int err;
+ u8 val;
+
+ err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val, TWL6030_PHOENIX_DEV_ON);
+ if (err)
+ return;
+
+ val |= TWL6030_APP_DEVOFF | TWL6030_CON_DEVOFF | TWL6030_MOD_DEVOFF;
+ twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val, TWL6030_PHOENIX_DEV_ON);
+}
+
+
static struct of_dev_auxdata twl_auxdata_lookup[] = {
OF_DEV_AUXDATA("ti,twl4030-gpio", 0, "twl4030-gpio", NULL),
{ /* sentinel */ },
@@ -852,6 +871,15 @@ twl_probe(struct i2c_client *client)
goto free;
}

+ if (twl_class_is_6030()) {
+ if (of_device_is_system_power_controller(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