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Date: Mon, 25 Apr 2016 19:46:53 +0200
From: Michael Heimpold <mhei@...mpold.de>
To: "Andrew F. Davis" <afd@...com>
Cc: Jonathan Cameron <jic23@...nel.org>,
Mark Brown <broonie@...nel.org>, netdev@...r.kernel.org,
devicetree@...r.kernel.org, Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>
Subject: Re: [PATCH v2 net-next] net: ethernet: enc28j60: add device tree support
Hi,
Am Monday 25 April 2016, 10:39:41 schrieben Sie:
> On 04/24/2016 04:28 PM, Michael Heimpold wrote:
> > The following patch adds the required match table for device tree support
> > (and while at, fix the indent). It's also possible to specify the
> > MAC address in the DT blob.
> >
> > Also add the corresponding binding documentation file.
> >
> > Signed-off-by: Michael Heimpold <mhei@...mpold.de>
> > ---
> >
> > v2: * took care of Arnd Bergmann's review comments
> >
> > - allow to specify MAC address via DT
> > - unconditionally define DT id table
> >
> > * increased the driver version minor number
> > * driver author's email address bounces, removed from address list
> >
> > .../devicetree/bindings/net/microchip-enc28j60.txt | 50
> > ++++++++++++++++++++++ drivers/net/ethernet/microchip/enc28j60.c
> > | 20 +++++++--
> > 2 files changed, 67 insertions(+), 3 deletions(-)
> > create mode 100644
> > Documentation/devicetree/bindings/net/microchip-enc28j60.txt>
> > diff --git a/Documentation/devicetree/bindings/net/microchip-enc28j60.txt
> > b/Documentation/devicetree/bindings/net/microchip-enc28j60.txt new file
> > mode 100644
> > index 0000000..847a97b
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/net/microchip-enc28j60.txt
> > @@ -0,0 +1,50 @@
> > +* Microchip ENC28J60
> > +
> > +This is a standalone 10 MBit ethernet controller with SPI interface.
> > +
> > +For each device connected to a SPI bus, define a child node within
> > +the SPI master node.
> > +
> > +Required properties:
> > +- compatible: Should be "microchip,enc28j60"
> > +- reg: Specify the SPI chip select the ENC28J60 is wired to
> > +- interrupts: Specify the interrupt and interrupt type (usually falling
> > edge) +
> > +Optional properties:
> > +- interrupt-parent: Specify the pHandle of the source interrupt
> > +- spi-max-frequency: Maximum frequency of the SPI bus when accessing the
> > ENC28J60. + According to the ENC28J80 datasheet, the chip allows a
> > maximum of 20 MHz, however, + board designs may need to limit this
> > value.
> > +- local-mac-address: See ethernet.txt in the same directory.
> > +
> > +
> > +Example (for NXP i.MX28 with pin control stuff for GPIO irq):
> > +
> > + ssp2: ssp@...14000 {
> > + compatible = "fsl,imx28-spi";
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&spi2_pins_b &spi2_sck_cfg>;
> > + status = "okay";
> > +
> > + enc28j60: ethernet@0 {
> > + compatible = "microchip,enc28j60";
> > + pinctrl-names = "default";
> > + pinctrl-0 = <&enc28j60_pins>;
> > + reg = <0>;
> > + interrupt-parent = <&gpio3>;
> > + interrupts = <3 IRQ_TYPE_EDGE_FALLING>;
> > + spi-max-frequency = <12000000>;
> > + };
> > + };
> > +
> > + pinctrl@...18000 {
> > + enc28j60_pins: enc28j60_pins@0 {
> > + reg = <0>;
> > + fsl,pinmux-ids = <
> > + MX28_PAD_AUART0_RTS__GPIO_3_3 /*
> > Interrupt */ + >;
> > + fsl,drive-strength = <MXS_DRIVE_4mA>;
> > + fsl,voltage = <MXS_VOLTAGE_HIGH>;
> > + fsl,pull-up = <MXS_PULL_DISABLE>;
> > + };
> > + };
> > diff --git a/drivers/net/ethernet/microchip/enc28j60.c
> > b/drivers/net/ethernet/microchip/enc28j60.c index b723622..7066954 100644
> > --- a/drivers/net/ethernet/microchip/enc28j60.c
> > +++ b/drivers/net/ethernet/microchip/enc28j60.c
> > @@ -28,11 +28,12 @@
> >
> > #include <linux/skbuff.h>
> > #include <linux/delay.h>
> > #include <linux/spi/spi.h>
> >
> > +#include <linux/of_net.h>
> >
> > #include "enc28j60_hw.h"
> >
> > #define DRV_NAME "enc28j60"
> >
> > -#define DRV_VERSION "1.01"
> > +#define DRV_VERSION "1.02"
> >
> > #define SPI_OPLEN 1
> >
> > @@ -1548,6 +1549,7 @@ static int enc28j60_probe(struct spi_device *spi)
> >
> > {
> >
> > struct net_device *dev;
> > struct enc28j60_net *priv;
> >
> > + const void *macaddr;
> >
> > int ret = 0;
> >
> > if (netif_msg_drv(&debug))
> >
> > @@ -1579,7 +1581,12 @@ static int enc28j60_probe(struct spi_device *spi)
> >
> > ret = -EIO;
> > goto error_irq;
> >
> > }
> >
> > - eth_hw_addr_random(dev);
> > +
> > + macaddr = of_get_mac_address(spi->dev.of_node);
> > + if (macaddr)
>
> You should also check if it is a valid MAC for Ethernet, recommend:
>
> if (macaddr && is_valid_ether_addr(macaddr))
>
But of_get_mac_address already takes care of this, see
http://lxr.free-electrons.com/source/drivers/of/of_net.c#L45
Also it already checks whether spi->dev.of_node is populated at all.
It returns NULL in both error cases.
So I prefered to omit both test here.
Regards,
Michael
> > + ether_addr_copy(dev->dev_addr, macaddr);
> > + else
> > + eth_hw_addr_random(dev);
> >
> > enc28j60_set_hw_macaddr(dev);
> >
> > /* Board setup must set the relevant edge trigger type;
> >
> > @@ -1634,9 +1641,16 @@ static int enc28j60_remove(struct spi_device *spi)
> >
> > return 0;
> >
> > }
> >
> > +static const struct of_device_id enc28j60_dt_ids[] = {
> > + { .compatible = "microchip,enc28j60" },
> > + { /* sentinel */ }
> > +};
> > +MODULE_DEVICE_TABLE(of, enc28j60_dt_ids);
> > +
> >
> > static struct spi_driver enc28j60_driver = {
> >
> > .driver = {
> >
> > - .name = DRV_NAME,
> > + .name = DRV_NAME,
> > + .of_match_table = enc28j60_dt_ids,
> >
> > },
> >
> > .probe = enc28j60_probe,
> > .remove = enc28j60_remove,
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