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Subject[PATCH v2] net: fec: Add "phy-reset-active-low" property to DT
Date
We need that for a custom hardware that needs the reverse reset
sequence.

Signed-off-by: Bernhard Walle <bernhard@bwalle.de>
---
Changes compared to v1:
- Add documentation to 'phy-reset-gpios' that flags are ignored
as suggested by Andrew Lunn.

Documentation/devicetree/bindings/net/fsl-fec.txt | 7 ++++++-
drivers/net/ethernet/freescale/fec_main.c | 8 ++++++--
2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/net/fsl-fec.txt b/Documentation/devicetree/bindings/net/fsl-fec.txt
index a9eb611..0caa429 100644
--- a/Documentation/devicetree/bindings/net/fsl-fec.txt
+++ b/Documentation/devicetree/bindings/net/fsl-fec.txt
@@ -7,11 +7,16 @@ Required properties:
- phy-mode : See ethernet.txt file in the same directory

Optional properties:
-- phy-reset-gpios : Should specify the gpio for phy reset
+- phy-reset-gpios : Should specify the gpio for phy reset. Additional
+ flags are ignored, see the non-standard 'phy-reset-active-low' property
+ instead.
- phy-reset-duration : Reset duration in milliseconds. Should present
only if property "phy-reset-gpios" is available. Missing the property
will have the duration be 1 millisecond. Numbers greater than 1000 are
invalid and 1 millisecond will be used instead.
+- phy-reset-active-low : If present then the reset sequence using the GPIO
+ specified in the "phy-reset-gpios" property is reversed (H=reset state,
+ L=operation state).
- phy-supply : regulator that powers the Ethernet PHY.
- phy-handle : phandle to the PHY device connected to this device.
- fixed-link : Assume a fixed link. See fixed-link.txt in the same directory.
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 41c81f6..98caf87 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c
@@ -3229,6 +3229,7 @@ static int fec_enet_init(struct net_device *ndev)
static void fec_reset_phy(struct platform_device *pdev)
{
int err, phy_reset;
+ bool active_low = false;
int msec = 1;
struct device_node *np = pdev->dev.of_node;

@@ -3244,14 +3245,17 @@ static void fec_reset_phy(struct platform_device *pdev)
if (!gpio_is_valid(phy_reset))
return;

+ active_low = of_property_read_bool(np, "phy-reset-active-low");
+
err = devm_gpio_request_one(&pdev->dev, phy_reset,
- GPIOF_OUT_INIT_LOW, "phy-reset");
+ active_low ? GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
+ "phy-reset");
if (err) {
dev_err(&pdev->dev, "failed to get phy-reset-gpios: %d\n", err);
return;
}
msleep(msec);
- gpio_set_value_cansleep(phy_reset, 1);
+ gpio_set_value_cansleep(phy_reset, !active_low);
}
#else /* CONFIG_OF */
static void fec_reset_phy(struct platform_device *pdev)
--
2.7.1
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