* [PATCH net-next] net: dsa: sja1105: don't keep a persistent reference to the reset GPIO
@ 2021-09-22 15:10 Vladimir Oltean
2021-09-22 16:09 ` Florian Fainelli
2021-09-23 11:50 ` patchwork-bot+netdevbpf
0 siblings, 2 replies; 3+ messages in thread
From: Vladimir Oltean @ 2021-09-22 15:10 UTC (permalink / raw)
To: netdev
Cc: Andrew Lunn, Vivien Didelot, Florian Fainelli, Vladimir Oltean,
David S. Miller, Jakub Kicinski
The driver only needs the reset GPIO for a very brief period, so instead
of using devres and keeping the descriptor pointer inside priv, just use
that descriptor inside the sja1105_hw_reset function and then let go of
it.
Also use gpiod_get_optional while at it, and error out on real errors
(bad flags etc).
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
drivers/net/dsa/sja1105/sja1105.h | 1 -
drivers/net/dsa/sja1105/sja1105_main.c | 29 ++++++++++++++++++--------
2 files changed, 20 insertions(+), 10 deletions(-)
diff --git a/drivers/net/dsa/sja1105/sja1105.h b/drivers/net/dsa/sja1105/sja1105.h
index b83a5114348c..618c8d6a8be1 100644
--- a/drivers/net/dsa/sja1105/sja1105.h
+++ b/drivers/net/dsa/sja1105/sja1105.h
@@ -230,7 +230,6 @@ struct sja1105_private {
unsigned long bcast_egress_floods;
const struct sja1105_info *info;
size_t max_xfer_len;
- struct gpio_desc *reset_gpio;
struct spi_device *spidev;
struct dsa_switch *ds;
u16 bridge_pvid[SJA1105_MAX_NUM_PORTS];
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index 22f39c35f53f..741e965f6068 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -27,15 +27,29 @@
#define SJA1105_UNKNOWN_MULTICAST 0x010000000000ull
-static void sja1105_hw_reset(struct gpio_desc *gpio, unsigned int pulse_len,
- unsigned int startup_delay)
+/* Configure the optional reset pin and bring up switch */
+static int sja1105_hw_reset(struct device *dev, unsigned int pulse_len,
+ unsigned int startup_delay)
{
+ struct gpio_desc *gpio;
+
+ gpio = gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(gpio))
+ return PTR_ERR(gpio);
+
+ if (!gpio)
+ return 0;
+
gpiod_set_value_cansleep(gpio, 1);
/* Wait for minimum reset pulse length */
msleep(pulse_len);
gpiod_set_value_cansleep(gpio, 0);
/* Wait until chip is ready after reset */
msleep(startup_delay);
+
+ gpiod_put(gpio);
+
+ return 0;
}
static void
@@ -3224,17 +3238,14 @@ static int sja1105_probe(struct spi_device *spi)
return -EINVAL;
}
+ rc = sja1105_hw_reset(dev, 1, 1);
+ if (rc)
+ return rc;
+
priv = devm_kzalloc(dev, sizeof(struct sja1105_private), GFP_KERNEL);
if (!priv)
return -ENOMEM;
- /* Configure the optional reset pin and bring up switch */
- priv->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
- if (IS_ERR(priv->reset_gpio))
- dev_dbg(dev, "reset-gpios not defined, ignoring\n");
- else
- sja1105_hw_reset(priv->reset_gpio, 1, 1);
-
/* Populate our driver private structure (priv) based on
* the device tree node that was probed (spi)
*/
--
2.25.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net-next] net: dsa: sja1105: don't keep a persistent reference to the reset GPIO
2021-09-22 15:10 [PATCH net-next] net: dsa: sja1105: don't keep a persistent reference to the reset GPIO Vladimir Oltean
@ 2021-09-22 16:09 ` Florian Fainelli
2021-09-23 11:50 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: Florian Fainelli @ 2021-09-22 16:09 UTC (permalink / raw)
To: Vladimir Oltean, netdev
Cc: Andrew Lunn, Vivien Didelot, Vladimir Oltean, David S. Miller,
Jakub Kicinski
On 9/22/21 8:10 AM, Vladimir Oltean wrote:
> The driver only needs the reset GPIO for a very brief period, so instead
> of using devres and keeping the descriptor pointer inside priv, just use
> that descriptor inside the sja1105_hw_reset function and then let go of
> it.
>
> Also use gpiod_get_optional while at it, and error out on real errors
> (bad flags etc).
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
--
Florian
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net-next] net: dsa: sja1105: don't keep a persistent reference to the reset GPIO
2021-09-22 15:10 [PATCH net-next] net: dsa: sja1105: don't keep a persistent reference to the reset GPIO Vladimir Oltean
2021-09-22 16:09 ` Florian Fainelli
@ 2021-09-23 11:50 ` patchwork-bot+netdevbpf
1 sibling, 0 replies; 3+ messages in thread
From: patchwork-bot+netdevbpf @ 2021-09-23 11:50 UTC (permalink / raw)
To: Vladimir Oltean
Cc: netdev, andrew, vivien.didelot, f.fainelli, olteanv, davem, kuba
Hello:
This patch was applied to netdev/net-next.git (refs/heads/master):
On Wed, 22 Sep 2021 18:10:29 +0300 you wrote:
> The driver only needs the reset GPIO for a very brief period, so instead
> of using devres and keeping the descriptor pointer inside priv, just use
> that descriptor inside the sja1105_hw_reset function and then let go of
> it.
>
> Also use gpiod_get_optional while at it, and error out on real errors
> (bad flags etc).
>
> [...]
Here is the summary with links:
- [net-next] net: dsa: sja1105: don't keep a persistent reference to the reset GPIO
https://git.kernel.org/netdev/net-next/c/33e1501f5a5f
You are awesome, thank you!
--
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-09-22 15:10 [PATCH net-next] net: dsa: sja1105: don't keep a persistent reference to the reset GPIO Vladimir Oltean
2021-09-22 16:09 ` Florian Fainelli
2021-09-23 11:50 ` patchwork-bot+netdevbpf
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