[PATCH V2] net: micrel : ks8851-ml: add vdd-supply support
From: Nishanth Menon <nm@ti.com>
Date: 2014-03-21 09:28:00
Also in:
linux-arm-kernel, linux-devicetree, linux-omap
Subsystem:
networking drivers, open firmware and flattened device tree bindings, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds
Few platforms use external regulator to keep the ethernet MAC supplied. So, request and enable the regulator for driver functionality. Fixes: 66fda75f47dc (regulator: core: Replace direct ops->disable usage) Reported-by: Russell King <redacted> Suggested-by: Markus Pargmann <redacted> Signed-off-by: Nishanth Menon <nm@ti.com> --- This fixes a regression in SDP4430 platform as reported by Russel here: http://marc.info/?t=139509918200014&r=1&w=2 Patch is based on [v3.14-rc7] tag, if it is too late to submit, I can repost rebased to git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git Changes in v2: based on Marcus's comment, switched to managed regulator_get, however retained the enable/disable as balanced. v1: https://patchwork.kernel.org/patch/3871401/ .../devicetree/bindings/net/micrel-ks8851.txt | 1 + drivers/net/ethernet/micrel/ks8851.c | 24 +++++++++++++++++++- 2 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/net/micrel-ks8851.txt b/Documentation/devicetree/bindings/net/micrel-ks8851.txt
index 11ace3c..4fc3927 100644
--- a/Documentation/devicetree/bindings/net/micrel-ks8851.txt
+++ b/Documentation/devicetree/bindings/net/micrel-ks8851.txt@@ -7,3 +7,4 @@ Required properties: Optional properties: - local-mac-address : Ethernet mac address to use +- vdd-supply: supply for Ethernet mac
diff --git a/drivers/net/ethernet/micrel/ks8851.c b/drivers/net/ethernet/micrel/ks8851.c
index 727b546a..44923e0 100644
--- a/drivers/net/ethernet/micrel/ks8851.c
+++ b/drivers/net/ethernet/micrel/ks8851.c@@ -23,6 +23,7 @@ #include <linux/crc32.h> #include <linux/mii.h> #include <linux/eeprom_93cx6.h> +#include <linux/regulator/consumer.h> #include <linux/spi/spi.h>
@@ -83,6 +84,7 @@ union ks8851_tx_hdr { * @rc_rxqcr: Cached copy of KS_RXQCR. * @eeprom_size: Companion eeprom size in Bytes, 0 if no eeprom * @eeprom: 93CX6 EEPROM state for accessing on-board EEPROM. + * @vdd_reg: Optional regulator supplying the chip * * The @lock ensures that the chip is protected when certain operations are * in progress. When the read or write packet transfer is in progress, most
@@ -130,6 +132,7 @@ struct ks8851_net { struct spi_transfer spi_xfer2[2]; struct eeprom_93cx6 eeprom; + struct regulator *vdd_reg; }; static int msg_enable;
@@ -1414,6 +1417,20 @@ static int ks8851_probe(struct spi_device *spi) ks->spidev = spi; ks->tx_space = 6144; + ks->vdd_reg = regulator_get_optional(&spi->dev, "vdd"); + if (IS_ERR(ks->vdd_reg)) { + ret = PTR_ERR(ks->vdd_reg); + if (ret == -EPROBE_DEFER) + goto err_reg; + } else { + ret = regulator_enable(ks->vdd_reg); + if (ret) { + dev_err(&spi->dev, "regulator enable fail: %d\n", + ret); + goto err_reg; + } + } + mutex_init(&ks->lock); spin_lock_init(&ks->statelock);
@@ -1508,8 +1525,11 @@ static int ks8851_probe(struct spi_device *spi) err_netdev: free_irq(ndev->irq, ks); -err_id: err_irq: +err_id: + if (!IS_ERR(ks->vdd_reg)) + regulator_disable(ks->vdd_reg); +err_reg: free_netdev(ndev); return ret; }
@@ -1523,6 +1543,8 @@ static int ks8851_remove(struct spi_device *spi) unregister_netdev(priv->netdev); free_irq(spi->irq, priv); + if (!IS_ERR(priv->vdd_reg)) + regulator_disable(priv->vdd_reg); free_netdev(priv->netdev); return 0;
--
1.7.9.5