netdev - Re: [PATCH v5 2/3] ARM: shmobile: lager: enable Ether

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Date:	Thu, 25 Jul 2013 10:30:28 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Magnus Damm <magnus.damm@...il.com>
Cc:	netdev <netdev@...r.kernel.org>,
	SH-Linux <linux-sh@...r.kernel.org>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [PATCH v5 2/3] ARM: shmobile: lager: enable Ether

On Wed, Jul 24, 2013 at 07:28:29PM +0900, Magnus Damm wrote:
> On Wed, Jul 24, 2013 at 5:56 PM, Simon Horman
> <horms+renesas@...ge.net.au> wrote:
> > Signed-off-by: Simon Horman <horms+renesas@...ge.net.au>
> >
> > ---
> >
> > This patch has a run-time dependency on "sh_eth: add support for r8a7790 SoC".
> >
> > v5
> > * As suggested by Laurent Pinchart
> >   - Do not use eth_magic pinmux group, that pin is not used on Lager
> > * As suggested by Morimoto-san and Magnus Damm
> >   - Refactor moving all setup code into boards-lager.c
> >
> > v4
> > * Remove needs_gpio_reset and reset_gpio from ether_platdata
> >   as the patch that adds that feature and those fields has
> >   been dropped.
> > * Annotate ether_platdata as __initdata
> >
> > v3
> > * Use newly added "r8a7790-ether" instead of "sh-eth"
> >
> > v2
> > * Do not add MSTP812, EtherAVB. It is not used.
> > * As suggested by Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
> >   - Move Ethernet element of MSTP enum to a separate line
> >   - Move declaration of r8a7790_add_ether_device() to immediately
> >     after that of r8a7790_add_standard_devices()
> >   - Add __initdata annotation to ether_resource.
> > * As suggested by Laurent Pinchart
> >   - Do not manipilate sh_eth reset GPIO directly,
> >     rather, do so through newly proposed support for this in
> >     the sh_eth driver.
> > * A suggested by Sergei Shtylyov
> >   - Move DTS portion into a separate patch
> > ---
> >  arch/arm/mach-shmobile/board-lager.c | 30 ++++++++++++++++++++++++++++++
> >  1 file changed, 30 insertions(+)
> >
> > diff --git a/arch/arm/mach-shmobile/board-lager.c b/arch/arm/mach-shmobile/board-lager.c
> > index 3c67b2a..86e6319 100644
> > --- a/arch/arm/mach-shmobile/board-lager.c
> > +++ b/arch/arm/mach-shmobile/board-lager.c
> > @@ -31,6 +31,7 @@
> >  #include <linux/platform_device.h>
> >  #include <linux/regulator/fixed.h>
> >  #include <linux/regulator/machine.h>
> > +#include <linux/sh_eth.h>
> >  #include <mach/common.h>
> >  #include <mach/irqs.h>
> >  #include <mach/r8a7790.h>
> > @@ -91,6 +92,20 @@ static struct resource mmcif1_resources[] = {
> >         DEFINE_RES_IRQ(gic_spi(170)),
> >  };
> >
> > +/* Ether */
> > +static struct sh_eth_plat_data ether_pdata __initdata = {
> > +       .phy                    = 0x1,
> > +       .edmac_endian           = EDMAC_LITTLE_ENDIAN,
> > +       .register_type          = SH_ETH_REG_FAST_RCAR,
> > +       .phy_interface          = PHY_INTERFACE_MODE_RMII,
> > +       .ether_link_active_low  = 1,
> > +};
> > +
> > +static struct resource ether_resources[] __initdata = {
> > +       DEFINE_RES_MEM(0xee700000, 0x400),
> > +       DEFINE_RES_IRQ(gic_spi(162)), /* IRQ0 */
> 
> Hi Simon,
> 
> Thanks for your patch series. In general it looks good, but
> surprisingly I have some comments related to interrupts.
> 
> According to the data sheet SPI 162 is ETHER(Fast), so gic_spi(162)
> above is correct. But the comment seems wrong.
> 
> I'm not sure where external interrupt pin IRQ0 comes from above, but I
> assume it is for the PHY chip. If so then we need to hook up the PHY
> interrupt as well. This may require some driver changes, I'm not sure.

I believe there is a PHY interrupt but that driver changes are required
in order to make use of it. I think we have discussed this previously
off-list.

> For external IRQ pins you want to use either INTC or GPIO depending on
> which pin you use, so using gic_spi() directly is always wrong. Please
> consult the lager manual or schematics for pin information.

Thanks, I will fix that up.
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