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 <rmk+kernel@xxxxxxxxxxxxxxxx> Suggested-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx> Signed-off-by: Nishanth Menon <nm@xxxxxx> --- This fixes a regression in SDP4430 platform as reported by Russell 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(resend): 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..674a58a 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 = devm_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 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
