054c0d4e31
Backport the mdio-bus reset gpio support from 4.12 and use it instead of toggling the reset ourself. Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
120 lines
3.6 KiB
Diff
120 lines
3.6 KiB
Diff
From d396e84c56047b303cac378dde4b2e5cc430b336 Mon Sep 17 00:00:00 2001
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From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
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Date: Mon, 12 Jun 2017 23:55:38 +0300
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Subject: [PATCH] mdio_bus: handle only single PHY reset GPIO
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Commit 4c5e7a2c0501 ("dt-bindings: mdio: Clarify binding document")
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declared that a MDIO reset GPIO property should have only a single GPIO
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reference/specifier, however the supporting code was left intact, still
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burdening the kernel with now apparently useless loops -- get rid of them.
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Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/phy/mdio_bus.c | 53 +++++++++++++++++-----------------------------
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drivers/of/of_mdio.c | 1 -
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include/linux/phy.h | 6 ++----
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3 files changed, 21 insertions(+), 39 deletions(-)
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--- a/drivers/net/phy/mdio_bus.c
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+++ b/drivers/net/phy/mdio_bus.c
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@@ -279,33 +279,22 @@ int __mdiobus_register(struct mii_bus *b
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mutex_init(&bus->mdio_lock);
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- /* de-assert bus level PHY GPIO resets */
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- if (bus->num_reset_gpios > 0) {
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- bus->reset_gpiod = devm_kcalloc(&bus->dev,
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- bus->num_reset_gpios,
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- sizeof(struct gpio_desc *),
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- GFP_KERNEL);
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- if (!bus->reset_gpiod)
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- return -ENOMEM;
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- }
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-
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- for (i = 0; i < bus->num_reset_gpios; i++) {
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- gpiod = devm_gpiod_get_index(&bus->dev, "reset", i,
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- GPIOD_OUT_LOW);
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- if (IS_ERR(gpiod)) {
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- err = PTR_ERR(gpiod);
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- if (err != -ENOENT) {
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- dev_err(&bus->dev,
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- "mii_bus %s couldn't get reset GPIO\n",
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- bus->id);
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- return err;
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- }
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- } else {
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- bus->reset_gpiod[i] = gpiod;
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- gpiod_set_value_cansleep(gpiod, 1);
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- udelay(bus->reset_delay_us);
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- gpiod_set_value_cansleep(gpiod, 0);
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+ /* de-assert bus level PHY GPIO reset */
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+ gpiod = devm_gpiod_get(&bus->dev, "reset", GPIOD_OUT_LOW);
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+ if (IS_ERR(gpiod)) {
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+ err = PTR_ERR(gpiod);
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+ if (err != -ENOENT) {
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+ dev_err(&bus->dev,
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+ "mii_bus %s couldn't get reset GPIO\n",
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+ bus->id);
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+ return err;
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}
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+ } else {
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+ bus->reset_gpiod = gpiod;
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+
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+ gpiod_set_value_cansleep(gpiod, 1);
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+ udelay(bus->reset_delay_us);
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+ gpiod_set_value_cansleep(gpiod, 0);
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}
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if (bus->reset)
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@@ -337,10 +326,8 @@ error:
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}
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/* Put PHYs in RESET to save power */
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- for (i = 0; i < bus->num_reset_gpios; i++) {
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- if (bus->reset_gpiod[i])
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- gpiod_set_value_cansleep(bus->reset_gpiod[i], 1);
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- }
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+ if (bus->reset_gpiod)
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+ gpiod_set_value_cansleep(bus->reset_gpiod, 1);
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device_del(&bus->dev);
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return err;
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@@ -363,10 +350,8 @@ void mdiobus_unregister(struct mii_bus *
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}
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/* Put PHYs in RESET to save power */
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- for (i = 0; i < bus->num_reset_gpios; i++) {
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- if (bus->reset_gpiod[i])
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- gpiod_set_value_cansleep(bus->reset_gpiod[i], 1);
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- }
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+ if (bus->reset_gpiod)
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+ gpiod_set_value_cansleep(bus->reset_gpiod, 1);
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device_del(&bus->dev);
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}
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--- a/drivers/of/of_mdio.c
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+++ b/drivers/of/of_mdio.c
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@@ -145,7 +145,6 @@ int of_mdiobus_register(struct mii_bus *
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/* Get bus level PHY reset GPIO details */
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mdio->reset_delay_us = DEFAULT_GPIO_RESET_DELAY;
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of_property_read_u32(np, "reset-delay-us", &mdio->reset_delay_us);
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- mdio->num_reset_gpios = of_gpio_named_count(np, "reset-gpios");
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/* Register the MDIO bus */
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rc = mdiobus_register(mdio);
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--- a/include/linux/phy.h
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+++ b/include/linux/phy.h
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@@ -194,10 +194,8 @@ struct mii_bus {
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/* GPIO reset pulse width in microseconds */
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int reset_delay_us;
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- /* Number of reset GPIOs */
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- int num_reset_gpios;
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- /* Array of RESET GPIO descriptors */
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- struct gpio_desc **reset_gpiod;
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+ /* RESET GPIO descriptor pointer */
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+ struct gpio_desc *reset_gpiod;
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};
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#define to_mii_bus(d) container_of(d, struct mii_bus, dev)
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