diff options
| author | Kyle Swenson <kyle.swenson@est.tech> | 2024-08-23 00:01:22 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-08-26 22:24:11 +0200 |
| commit | 69f47cad3a05f6cd345afca84f1e66740ff48a2d (patch) | |
| tree | 0142aa71951a3b3b0765de58f4e8a103251d1fc4 /drivers/net/pse-pd | |
| parent | dt-bindings: pse: tps23881: add reset-gpios (diff) | |
| download | linux-69f47cad3a05f6cd345afca84f1e66740ff48a2d.tar.xz linux-69f47cad3a05f6cd345afca84f1e66740ff48a2d.zip | |
net: pse-pd: tps23881: Support reset-gpios
The TPS23880/1 has an active-low reset pin that some boards connect to
the SoC to control when the TPS23880 is pulled out of reset.
Add support for this via a reset-gpios property in the DTS.
Signed-off-by: Kyle Swenson <kyle.swenson@est.tech>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Kory Maincent <kory.maincent@bootlin.com>
Link: https://patch.msgid.link/20240822220100.3030184-3-kyle.swenson@est.tech
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/pse-pd')
| -rw-r--r-- | drivers/net/pse-pd/tps23881.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/net/pse-pd/tps23881.c b/drivers/net/pse-pd/tps23881.c index 2ea75686a319..5c4e88be46ee 100644 --- a/drivers/net/pse-pd/tps23881.c +++ b/drivers/net/pse-pd/tps23881.c @@ -8,6 +8,7 @@ #include <linux/bitfield.h> #include <linux/delay.h> #include <linux/firmware.h> +#include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/module.h> #include <linux/of.h> @@ -737,6 +738,7 @@ static int tps23881_i2c_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct tps23881_priv *priv; + struct gpio_desc *reset; int ret; u8 val; @@ -749,6 +751,25 @@ static int tps23881_i2c_probe(struct i2c_client *client) if (!priv) return -ENOMEM; + reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); + if (IS_ERR(reset)) + return dev_err_probe(&client->dev, PTR_ERR(reset), "Failed to get reset GPIO\n"); + + if (reset) { + /* TPS23880 datasheet (Rev G) indicates minimum reset pulse is 5us */ + usleep_range(5, 10); + gpiod_set_value_cansleep(reset, 0); /* De-assert reset */ + + /* TPS23880 datasheet indicates the minimum time after power on reset + * should be 20ms, but the document describing how to load SRAM ("How + * to Load TPS2388x SRAM and Parity Code over I2C" (Rev E)) + * indicates we should delay that programming by at least 50ms. So + * we'll wait the entire 50ms here to ensure we're safe to go to the + * SRAM loading proceedure. + */ + msleep(50); + } + ret = i2c_smbus_read_byte_data(client, TPS23881_REG_DEVID); if (ret < 0) return ret; |