* Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.
From: Robin Holt @ 2011-08-10 18:35 UTC (permalink / raw)
To: Scott Wood
Cc: Wood Scott-B07421, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
U Bhaskar-B22300, Kumar Gala,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
Marc Kleine-Budde, PPC list, Wolfgang Grandegger
In-Reply-To: <4E42CDA8.5050902-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
On Wed, Aug 10, 2011 at 01:27:52PM -0500, Scott Wood wrote:
> On 08/10/2011 01:23 PM, Wolfgang Grandegger wrote:
> > On 08/10/2011 06:00 PM, Robin Holt wrote:
> >> On Wed, Aug 10, 2011 at 02:36:20PM +0000, U Bhaskar-B22300 wrote:
> > ...
> >> It looks like the way to do that is to assign a label to those devices
> >> and then associate the label with an alias. I have no idea how that
> >> works under the hood, but it is the way other files are set up. Take a
> >> look at arch/powerpc/boot/dts/bamboo.dts for how they define the serial
> >> interfaces.
> >
> > With a label you mean "label:" at the beginning of a node. Such labels
> > are translated by the device tree compiler in node handles, which can be
> > referenced within nodes by using <&label>, e.g.:
> >
> > UIC0: interrupt-controller0 {
> > ...
> > };
> > UIC1: interrupt-controller1 {
> > ...
> > interrupt-parent = <&UIC0>;
> > ...
> > };
> >
> > It has nothing to do with the name of the node.
>
> "...and then associate the label with an alias."
>
> The alias can then be used if you want "can0" versus "can1".
Does the alias get used by either the kernel or something else or is it
just extra detail with no purpose?
Robin
^ permalink raw reply
* Re: [PATCH v11 5/5] powerpc: Fix up fsl-flexcan device tree binding.
From: Robin Holt @ 2011-08-10 18:30 UTC (permalink / raw)
To: Scott Wood
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w,
netdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ, U Bhaskar-B22300,
Kumar Gala, Grant Likely, Marc Kleine-Budde, PPC list,
Wolfgang Grandegger
In-Reply-To: <4E42C196.7030708-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
On Wed, Aug 10, 2011 at 12:36:22PM -0500, Scott Wood wrote:
> On 08/10/2011 12:19 PM, Robin Holt wrote:
> > On Wed, Aug 10, 2011 at 11:56:28AM -0500, Scott Wood wrote:
> >> On 08/10/2011 11:27 AM, Robin Holt wrote:
> >>> -CPI Clock- Can Protocol Interface Clock
> >>> - This CLK_SRC bit of CTRL(control register) selects the clock source to
> >>> - the CAN Protocol Interface(CPI) to be either the peripheral clock
> >>> - (driven by the PLL) or the crystal oscillator clock. The selected clock
> >>> - is the one fed to the prescaler to generate the Serial Clock (Sclock).
> >>> - The PRESDIV field of CTRL(control register) controls a prescaler that
> >>> - generates the Serial Clock (Sclock), whose period defines the
> >>> - time quantum used to compose the CAN waveform.
> >>> +- compatible : Should be "fsl,flexcan" and optionally
> >>> + "fsl,flexcan-<processor>"
> >>
> >> fsl,<processor>-flexcan, and it should not be optional, and should come
> >> before "fsl,flexcan".
> >>
> >> Also may want to list fsl,p1010-rdb as a "canonical compatible" for
> >> anything which is backwards compatible with p1010's implementation.
> >
> > How do I specify 'canonical compatible'?
>
> Something like:
>
> compatible: Should be "fsl,<processor>-flexcan" and "fsl,flexcan".
>
> An implementation should also claim any of the following compatibles
> that it is fully backwards compatible with:
>
> - fsl,p1010-rdb
I am so confused. fsl,p1010-flexcan refers, in my mind at least, to
a particular chiplet on the p1010 freescale processor. fsl,p1010-rdb
would mean nothing to me as that is a p1010 processor with two flexcan
chiplets wired to a pair of DB-9 jacks. For the driver, what additional
information is being conveyed?
Let's cut to the chase. Here is what I have after incorporating your
earlier comment about the compatible line. Please mark this up to
exactly what you are asking for.
Thanks,
Robin
------------------------------------------------------------------------
Flexcan CAN contoller on Freescale's ARM and PowerPC processors
Required properties:
- compatible : Should be "fsl,<processor>-flexcan" and "fsl,flexcan"
- reg : Offset and length of the register set for this device
- interrupts : Interrupt tuple for this device
Example:
can@1c000 {
compatible = "fsl,p1010-flexcan", "fsl,flexcan";
reg = <0x1c000 0x1000>;
interrupts = <48 0x2>;
interrupt-parent = <&mpic>;
};
^ permalink raw reply
* Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.
From: Scott Wood @ 2011-08-10 18:27 UTC (permalink / raw)
To: Wolfgang Grandegger
Cc: Robin Holt, U Bhaskar-B22300, Wood Scott-B07421,
netdev@vger.kernel.org, Kumar Gala,
socketcan-core@lists.berlios.de, Marc Kleine-Budde, PPC list
In-Reply-To: <4E42CCB0.8090803@grandegger.com>
On 08/10/2011 01:23 PM, Wolfgang Grandegger wrote:
> On 08/10/2011 06:00 PM, Robin Holt wrote:
>> On Wed, Aug 10, 2011 at 02:36:20PM +0000, U Bhaskar-B22300 wrote:
> ...
>> It looks like the way to do that is to assign a label to those devices
>> and then associate the label with an alias. I have no idea how that
>> works under the hood, but it is the way other files are set up. Take a
>> look at arch/powerpc/boot/dts/bamboo.dts for how they define the serial
>> interfaces.
>
> With a label you mean "label:" at the beginning of a node. Such labels
> are translated by the device tree compiler in node handles, which can be
> referenced within nodes by using <&label>, e.g.:
>
> UIC0: interrupt-controller0 {
> ...
> };
> UIC1: interrupt-controller1 {
> ...
> interrupt-parent = <&UIC0>;
> ...
> };
>
> It has nothing to do with the name of the node.
"...and then associate the label with an alias."
The alias can then be used if you want "can0" versus "can1".
Appending numbers to the node name is typically only done when there's
no unit address, and a need to disambiguate.
-Scott
^ permalink raw reply
* Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.
From: Wolfgang Grandegger @ 2011-08-10 18:23 UTC (permalink / raw)
To: Robin Holt
Cc: Wood Scott-B07421, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
U Bhaskar-B22300, Kumar Gala,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
Marc Kleine-Budde, PPC list
In-Reply-To: <20110810160054.GT4926-sJ/iWh9BUns@public.gmane.org>
On 08/10/2011 06:00 PM, Robin Holt wrote:
> On Wed, Aug 10, 2011 at 02:36:20PM +0000, U Bhaskar-B22300 wrote:
...
> It looks like the way to do that is to assign a label to those devices
> and then associate the label with an alias. I have no idea how that
> works under the hood, but it is the way other files are set up. Take a
> look at arch/powerpc/boot/dts/bamboo.dts for how they define the serial
> interfaces.
With a label you mean "label:" at the beginning of a node. Such labels
are translated by the device tree compiler in node handles, which can be
referenced within nodes by using <&label>, e.g.:
UIC0: interrupt-controller0 {
...
};
UIC1: interrupt-controller1 {
...
interrupt-parent = <&UIC0>;
...
};
It has nothing to do with the name of the node.
Wolfgang.
^ permalink raw reply
* Re: [PATCH v11 4/5] powerpc: Add flexcan device support for p1010rdb.
From: Wolfgang Grandegger @ 2011-08-10 18:16 UTC (permalink / raw)
To: Kumar Gala
Cc: netdev-u79uwXL29TY76Z2rM5mHXA, U Bhaskar-B22300,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w, Marc Kleine-Budde,
PPC list
In-Reply-To: <8E5FA886-038D-4DF4-8A54-DD60188A21A2-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
On 08/10/2011 07:01 PM, Kumar Gala wrote:
>
> On Aug 10, 2011, at 11:27 AM, Robin Holt wrote:
>
>> I added a simple clock source for the p1010rdb so the flexcan driver
>> could determine a clock frequency. The p1010 flexcan device only has
>> an oscillator of system bus frequency divided by 2.
>>
>> Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
>> Acked-by: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
>> Acked-by: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>,
>> Cc: U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
>> Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
>> Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
>> Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
>> Cc: Kumar Gala <galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
>> ---
>> arch/powerpc/platforms/85xx/Kconfig | 2 +
>> arch/powerpc/platforms/85xx/Makefile | 2 +
>> arch/powerpc/platforms/85xx/clock.c | 52 ++++++++++++++++++++++++++++++++
>> arch/powerpc/platforms/85xx/p1010rdb.c | 8 +++++
>> 4 files changed, 64 insertions(+), 0 deletions(-)
>> create mode 100644 arch/powerpc/platforms/85xx/clock.c
>
> I dont understand how mpc85xx_clk_functions() ends up being associated with the frequency the flexcan is running at.
The function mpc85xx_clk_get_rate() returns "fsl_get_sys_freq() / 2" for
Flexcan devices.
> This either seems to global or I'm missing something.
This patch extends the existing Flexcan platform driver for ARM for the
PowerPC using the device tree. Due to the nice integration of the device
tree (of-platform) into the platform driver and devices, the difference
are quite small (see patches 1..3). Apart from the endianess issue, only
the clock needs to be handled in a common way. As ARM already uses the
clk interface, we found it straight-forward to implement it for the
P1010, or more general for the 85xx, as well, instead of using an
additional helper function.
> I still think the clk / freq info should be in the device tree and handled in the driver and NOT arch/powerpc platform code.
If I understand you correctly, you want the boot-loader to provide the
relevant information by fixing up the device tree, which then can be
handled arch-independently by the driver, right?
Wolfgang.
^ permalink raw reply
* Re: Use of 802.3ad bonding for increasing link throughput
From: Jay Vosburgh @ 2011-08-10 17:46 UTC (permalink / raw)
To: Tom Brown; +Cc: netdev
In-Reply-To: <4E427499.8060108@cyconix.com>
Tom Brown <sa212+glibc@cyconix.com> wrote:
>[couldn't thread with '802.3ad bonding brain damaged', as I've just signed
>up]
>
>So, under what circumstances would a user actually use 802.3ad mode to
>"increase" link throughput, rather than just for redundancy? Are there any
>circumstances in which a single file, for example, could be transferred at
>multiple-NIC speed?
Network load balancing, by and large, increases throughput in
aggregate, not for individual connections.
[...] The 3 hashing options are:
>
>- layer 2: presumably this always puts traffic on the same NIC, even in a
>LAG with multiple NICs? Should layer 2 ever be used?
Perhaps the network is such that the destinations are not
bonded, and can't handle more than 1 interface's worth of throughput.
Having the "server" end bonded still permits the clients deal with a
single IP address, handle failures of devices on the server, etc.
>- layer2+3: can't be used for a single file, since it still hashes to the
>same NIC, and can't be used for load-balancing, since different IP
>endpoints go unintelligently to different NICs
>
>- layer3+4: seems to have exactly the same issue as layer2+3, as well as
>being non-compliant
>
>I guess my problem is in understanding whether the 802.3/802.1AX spec has
>any use at all beyond redundancy. Given the requirement to maintain frame
>order at the distributor, I can't immediately see how having a bonded
>group of, say, 3 NICs is any better than having 3 separate NICs. Have I
>missed something obvious?
Others have answered this part already (that it permits larger
aggregate throughput to/from the host, but not single-stream throughput
greater than one interface's worth). This is by design, to prevent out
of order delivery of packets.
An aggregate of N devices can be better than 3 individual
devices in that it will gracefully handle failure of one of the devices
in the aggregate, and permits sharing of the bandwidth in aggregate
without the peers having to be hard-coded to specific destinations.
>And, having said that, the redundancy features seem limited. For hot
>standby, when the main link fails, you have to wait for both ends to
>timeout, and re-negotiate via LACP, and hopefully pick up the same
>lower-priority NIC, and then rely on a higher layer to request
>retransmission of the missing frame. Do any of you have any experience of
>using 802.1AX for anything useful and non-trivial?
In the linux implementation, as soon as the link goes down, that
port is removed from the aggregator and a new aggregator is selected
(which may be the same aggregator, depending on the option and
configuration). Language in 802.1AX section 5.3.13 permits us to
immediately remove a failed port from an aggregator without waiting for
LACP to time out.
>So, to get multiple-NIC speed, are we stuck with balance-rr? But
>presumably this only works if the other end of the link is also running
>the bonding driver?
Striping a single connection across multiple network interfaces
is very difficult to do without causing packets to be delivered out of
order.
Now, that said, if you want to have one TCP connection utilize
more than one interface's worth of throughput, then yes, balance-rr is
the only mode that may do that. The other end doesn't have to run
bonding, but it must have sufficient aggregate bandwidth to accomodate
the aggregate rate (e.g., N slower devices feeding into one faster
device).
Running balance-rr itself can be tricky to configure. An
unmanaged switch may not handle multiple ports with the same MAC address
very well (e.g., sending everything to one port, or sending everything
to all the ports). A managed switch must have the relevant ports
configured for etherchannel ("static link aggregation" in some
documentation), and the switch may balance the traffic when it leaves
the switch using its transmit algorithm. I'm not aware of any switches
that have a round-robin balance policy, so the switch may end up hashing
your traffic anyway (which will probably drop some of your packets,
because you're feeding them in faster than the switch can send them out
after they're hashed to one switch port).
It's possible to play games on managed switches and, e.g., put
each pair of ports (one at each end) into a separate VLAN, but schemes
like that will fail badly if a link goes down somewhere.
If each member of the bond goes through a different unmanaged
and not interconnected switch, that may avoid those issues (and this was
a common configuration back in the 10 Mb/sec days; it's described in
bonding.txt in more detail). That configuration still has issues if a
link fails. Connecting systems directly, back-to-back, should also
avoid those issues.
Lastly, balance-rr will deliver traffic out of order. Even the
best case, N slow links feeding one faster link, delivers some small
percentage out of order (in the low single digits).
On linux, the tcp_reordering sysctl value can be raised to
compensate, but it will still result in increased packet overhead, and
is not likely to be very efficient, and doesn't help with anything
that's not TCP/IP. I have not tested balance-rr in a few years now, but
my recollection is that, as a best case, throughput of one TCP
connection could reach about 1.5x with 2 slaves, or about 2.5x with 4
slaves (where the multipliers are in units of "bandwidth of one slave").
-J
---
-Jay Vosburgh, IBM Linux Technology Center, fubar@us.ibm.com
^ permalink raw reply
* Re: [PATCH v11 5/5] powerpc: Fix up fsl-flexcan device tree binding.
From: Scott Wood @ 2011-08-10 17:36 UTC (permalink / raw)
To: Robin Holt
Cc: Kumar Gala, Wolfgang Grandegger, U Bhaskar-B22300, Grant Likely,
Marc Kleine-Budde, socketcan-core, netdev, PPC list,
devicetree-discuss
In-Reply-To: <20110810171933.GW4926@sgi.com>
On 08/10/2011 12:19 PM, Robin Holt wrote:
> On Wed, Aug 10, 2011 at 11:56:28AM -0500, Scott Wood wrote:
>> On 08/10/2011 11:27 AM, Robin Holt wrote:
>>> -CPI Clock- Can Protocol Interface Clock
>>> - This CLK_SRC bit of CTRL(control register) selects the clock source to
>>> - the CAN Protocol Interface(CPI) to be either the peripheral clock
>>> - (driven by the PLL) or the crystal oscillator clock. The selected clock
>>> - is the one fed to the prescaler to generate the Serial Clock (Sclock).
>>> - The PRESDIV field of CTRL(control register) controls a prescaler that
>>> - generates the Serial Clock (Sclock), whose period defines the
>>> - time quantum used to compose the CAN waveform.
>>> +- compatible : Should be "fsl,flexcan" and optionally
>>> + "fsl,flexcan-<processor>"
>>
>> fsl,<processor>-flexcan, and it should not be optional, and should come
>> before "fsl,flexcan".
>>
>> Also may want to list fsl,p1010-rdb as a "canonical compatible" for
>> anything which is backwards compatible with p1010's implementation.
>
> How do I specify 'canonical compatible'?
Something like:
compatible: Should be "fsl,<processor>-flexcan" and "fsl,flexcan".
An implementation should also claim any of the following compatibles
that it is fully backwards compatible with:
- fsl,p1010-rdb
> What would be the use of it in that implementation?
It limits the number of compatibles a driver has to care about, so you
don't need a huge ID table just to be able to figure out whether this is
a p1010-style flexcan or ARM-style.
-Scott
^ permalink raw reply
* Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.
From: Kumar Gala @ 2011-08-10 17:26 UTC (permalink / raw)
To: Robin Holt
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
Wood Scott-B07421, U Bhaskar-B22300, PPC list,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
In-Reply-To: <20110810172040.GX4926-sJ/iWh9BUns@public.gmane.org>
>>>>>>> So the node names should be
>>>>>>> can@1c000 {
>>>>>>> can@1d000 {
>>>>>>> correct?
>>>>>>>
>>>>>> [Bhaskar] As there are two CAN controllers on P1010,So won't it be better
>>>>>> to distinguish it by can0 and can1 instead by simple "can" ?
>>>>>
>>>>> It looks like the way to do that is to assign a label to those devices
>>>>> and then associate the label with an alias. I have no idea how that
>>>>> works under the hood, but it is the way other files are set up. Take a
>>>>> look at arch/powerpc/boot/dts/bamboo.dts for how they define the serial
>>>>> interfaces.
>>>>>
>>>>> Grant or Wolfgang, is that the right way to handle the concern about
>>>>> names or does it have no practical effect with the Linux kernel?
>>>>
>>>> It has not effect. The label is just if you need to reference it via some other means.
>>>
>>> Does the alias have an effect?
>>
>> nope
>
> Then how does the device number get associated with a particular device
What do you mean by device number?
> and how is user-space ensured a consistent namespace?
that is left to udev rules.
- k
^ permalink raw reply
* Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.
From: Robin Holt @ 2011-08-10 17:20 UTC (permalink / raw)
To: Kumar Gala
Cc: Wood Scott-B07421, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
U Bhaskar-B22300,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org, PPC list
In-Reply-To: <8C9817C6-735D-4B7C-A03B-5661C04C725A-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
On Wed, Aug 10, 2011 at 12:17:45PM -0500, Kumar Gala wrote:
>
> On Aug 10, 2011, at 12:16 PM, Robin Holt wrote:
>
> > On Wed, Aug 10, 2011 at 11:53:15AM -0500, Kumar Gala wrote:
> >>
> >> On Aug 10, 2011, at 11:00 AM, Robin Holt wrote:
> >>
> >>> On Wed, Aug 10, 2011 at 02:36:20PM +0000, U Bhaskar-B22300 wrote:
> >>>>
> >>>>
> >>>>> -----Original Message-----
> >>>>> From: Robin Holt [mailto:holt-sJ/iWh9BUns@public.gmane.org]
> >>>>> Sent: Wednesday, August 10, 2011 7:46 PM
> >>>>> To: Wolfgang Grandegger
> >>>>> Cc: Robin Holt; Marc Kleine-Budde; U Bhaskar-B22300; Wood Scott-B07421;
> >>>>> netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; Kumar Gala; socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org; PPC
> >>>>> list
> >>>>> Subject: Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree
> >>>>> binding.
> >>>>>
> >>>>> On Wed, Aug 10, 2011 at 03:47:43PM +0200, Wolfgang Grandegger wrote:
> >>>>>> Hi Robin,
> >>>>>>
> >>>>>> On 08/10/2011 05:06 AM, Robin Holt wrote:
> >>>>>>> In working with the socketcan developers, we have come to the
> >>>>>>> conclusion the Documentation...fsl-flexcan.txt device tree
> >>>>>>> documentation needs to be cleaned up. The driver does not depend
> >>>>>>> upon any properties other
> >>>>>>
> >>>>>> Your first sentence could be misleading. Please just describe what the
> >>>>>> patch does and why, something like:
> >>>>>>
> >>>>>> "This patch cleans up the documentation of the device-tree binding for
> >>>>>> the Flexcan devices on Freescale's PowerPC and ARM cores. Extra
> >>>>>> properties are not needed as the frequency of the source clock is
> >>>>>> fixed..." and so on.
> >>>>>
> >>>>> I borrowed heavily from your message. ;)
> >>>>>
> >>>>>>> than the required properties so we are removing the file.
> >>>>>>> Additionally, the p1010*dts* files are not following the standard
> >>>>>>> for node naming in that they have a trailing -v1.0.
> >>>>>>
> >>>>>>> Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
> >>>>>>> To: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
> >>>>>>> To: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>,
> >>>>>>> To: U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> >>>>>>> To: Scott Wood <scottwood-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> >>>>>>> Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
> >>>>>>> Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
> >>>>>>> Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
> >>>>>>> Cc: Kumar Gala <galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
> >>>>>>> ---
> >>>>>>> .../devicetree/bindings/net/can/fsl-flexcan.txt | 61 ----------
> >>>>> ----------
> >>>>>>> arch/powerpc/boot/dts/p1010rdb.dts | 8 ---
> >>>>>>> arch/powerpc/boot/dts/p1010si.dtsi | 8 +-
> >>>>>>> 3 files changed, 4 insertions(+), 73 deletions(-) delete mode
> >>>>>>> 100644 Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> >>>>>>>
> >>>>>>> diff --git
> >>>>>>> a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> >>>>>>> b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> >>>>>>> deleted file mode 100644
> >>>>>>> index 1a729f0..0000000
> >>>>>>> --- a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> >>>>>>> +++ /dev/null
> >>>>>>> @@ -1,61 +0,0 @@
> >>>>>>> -CAN Device Tree Bindings
> >>>>>>> -------------------------
> >>>>>>> -2011 Freescale Semiconductor, Inc.
> >>>>>>> -
> >>>>>>> -fsl,flexcan-v1.0 nodes
> >>>>>>> ------------------------
> >>>>>>> -In addition to the required compatible-, reg- and
> >>>>>>> interrupt-properties, you can -also specify which clock source shall
> >>>>> be used for the controller.
> >>>>>>> -
> >>>>>>> -CPI Clock- Can Protocol Interface Clock
> >>>>>>> - This CLK_SRC bit of CTRL(control register) selects the clock source
> >>>>> to
> >>>>>>> - the CAN Protocol Interface(CPI) to be either the peripheral clock
> >>>>>>> - (driven by the PLL) or the crystal oscillator clock. The selected
> >>>>> clock
> >>>>>>> - is the one fed to the prescaler to generate the Serial Clock
> >>>>> (Sclock).
> >>>>>>> - The PRESDIV field of CTRL(control register) controls a prescaler
> >>>>> that
> >>>>>>> - generates the Serial Clock (Sclock), whose period defines the
> >>>>>>> - time quantum used to compose the CAN waveform.
> >>>>>>> -
> >>>>>>> -Can Engine Clock Source
> >>>>>>> - There are two sources for CAN clock
> >>>>>>> - - Platform Clock It represents the bus clock
> >>>>>>> - - Oscillator Clock
> >>>>>>> -
> >>>>>>> - Peripheral Clock (PLL)
> >>>>>>> - --------------
> >>>>>>> - |
> >>>>>>> - --------- -------------
> >>>>>>> - | |CPI Clock | Prescaler | Sclock
> >>>>>>> - | |---------------->| (1.. 256) |------------>
> >>>>>>> - --------- -------------
> >>>>>>> - | |
> >>>>>>> - -------------- ---------------------CLK_SRC
> >>>>>>> - Oscillator Clock
> >>>>>>> -
> >>>>>>> -- fsl,flexcan-clock-source : CAN Engine Clock Source.This property
> >>>>> selects
> >>>>>>> - the peripheral clock. PLL clock is fed to the
> >>>>>>> - prescaler to generate the Serial Clock (Sclock).
> >>>>>>> - Valid values are "oscillator" and "platform"
> >>>>>>> - "oscillator": CAN engine clock source is
> >>>>> oscillator clock.
> >>>>>>> - "platform" The CAN engine clock source is the bus
> >>>>> clock
> >>>>>>> - (platform clock).
> >>>>>>> -
> >>>>>>> -- fsl,flexcan-clock-divider : for the reference and system clock, an
> >>>>> additional
> >>>>>>> - clock divider can be specified.
> >>>>>>> -- clock-frequency: frequency required to calculate the bitrate for
> >>>>> FlexCAN.
> >>>>>>> -
> >>>>>>> -Note:
> >>>>>>> - - v1.0 of flexcan-v1.0 represent the IP block version for P1010
> >>>>> SOC.
> >>>>>>> - - P1010 does not have oscillator as the Clock Source.So the default
> >>>>>>> - Clock Source is platform clock.
> >>>>>>> -Examples:
> >>>>>>> -
> >>>>>>> - can0@1c000 {
> >>>>>>> - compatible = "fsl,flexcan-v1.0";
> >>>>>>> - reg = <0x1c000 0x1000>;
> >>>>>>> - interrupts = <48 0x2>;
> >>>>>>> - interrupt-parent = <&mpic>;
> >>>>>>> - fsl,flexcan-clock-source = "platform";
> >>>>>>> - fsl,flexcan-clock-divqider = <2>;
> >>>>>>> - clock-frequency = <fixed by u-boot>;
> >>>>>>> - };
> >>>>>>
> >>>>>> Do we really want to drop the documentation for that binding. I think
> >>>>>> something like the following text would be still useful:
> >>>>>>
> >>>>>> ------------------------
> >>>>>> Flexcan CAN contoller on Freescale's ARM and PowerPC processors
> >>>>>>
> >>>>>> Required properties:
> >>>>>>
> >>>>>> - compatible : Should be "fsl,flexcan" and optionally
> >>>>>> "fsl,flexcan-<processor>"
> >>>>>> - reg : Offset and length of the register set for this device
> >>>>>> - interrupts : Interrupt tuple for this device
> >>>>>>
> >>>>>> Example:
> >>>>>>
> >>>>>> can@1c000 {
> >>>>>> compatible = "fsl,p1010-flexcan", "fsl,flexcan";
> >>>>>> reg = <0x1c000 0x1000>;
> >>>>>> interrupts = <48 0x2>;
> >>>>>> interrupt-parent = <&mpic>;
> >>>>>> };
> >>>>>> -------------------------
> >>>>>
> >>>>> Done, except the
> >>>>>> compatible = "fsl,p1010-flexcan", "fsl,flexcan";
> >>>>>
> >>>>> line is
> >>>>> compatible = "fsl,flexcan", "fsl,flexcan-p1010";
> >>>>>
> >>>>>>
> >>>>>> What do you think?
> >>>>>>
> >>>>>>> diff --git a/arch/powerpc/boot/dts/p1010rdb.dts
> >>>>>>> b/arch/powerpc/boot/dts/p1010rdb.dts
> >>>>>>> index 6b33b73..d6a0bb2 100644
> >>>>>>> --- a/arch/powerpc/boot/dts/p1010rdb.dts
> >>>>>>> +++ b/arch/powerpc/boot/dts/p1010rdb.dts
> >>>>>>> @@ -169,14 +169,6 @@
> >>>>>>> };
> >>>>>>> };
> >>>>>>>
> >>>>>>> - can0@1c000 {
> >>>>>>> - fsl,flexcan-clock-source = "platform";
> >>>>>>> - };
> >>>>>>> -
> >>>>>>> - can1@1d000 {
> >>>>>>> - fsl,flexcan-clock-source = "platform";
> >>>>>>> - };
> >>>>>>> -
> >>>>>>> usb@22000 {
> >>>>>>> phy_type = "utmi";
> >>>>>>> };
> >>>>>>> diff --git a/arch/powerpc/boot/dts/p1010si.dtsi
> >>>>>>> b/arch/powerpc/boot/dts/p1010si.dtsi
> >>>>>>> index 7f51104..20c396d 100644
> >>>>>>> --- a/arch/powerpc/boot/dts/p1010si.dtsi
> >>>>>>> +++ b/arch/powerpc/boot/dts/p1010si.dtsi
> >>>>>>> @@ -141,19 +141,19 @@
> >>>>>>> };
> >>>>>>>
> >>>>>>> can0@1c000 {
> >>>>>>> - compatible = "fsl,flexcan-v1.0";
> >>>>>>> + compatible = "fsl,p1010-flexcan",
> >>>>>>> + "fsl,flexcan";
> >>>>>>
> >>>>>> Does fit on one line.
> >>>>>>
> >>>>>>> reg = <0x1c000 0x1000>;
> >>>>>>> interrupts = <48 0x2>;
> >>>>>>> interrupt-parent = <&mpic>;
> >>>>>>> - fsl,flexcan-clock-divider = <2>;
> >>>>>>> };
> >>>>>>>
> >>>>>>> can1@1d000 {
> >>>>>>> - compatible = "fsl,flexcan-v1.0";
> >>>>>>> + compatible = "fsl,p1010-flexcan",
> >>>>>>> + "fsl,flexcan";
> >>>>>>
> >>>>>> Ditto
> >>>>>>
> >>>>>>> reg = <0x1d000 0x1000>;
> >>>>>>> interrupts = <61 0x2>;
> >>>>>>> interrupt-parent = <&mpic>;
> >>>>>>> - fsl,flexcan-clock-divider = <2>;
> >>>>>>> };
> >>>>>>>
> >>>>>>> L2: l2-cache-controller@20000 {
> >>>>>>
> >>>>>> Please also correct the node names (not using the number suffix).
> >>>>>
> >>>>> So the node names should be
> >>>>> can@1c000 {
> >>>>> can@1d000 {
> >>>>> correct?
> >>>>>
> >>>> [Bhaskar] As there are two CAN controllers on P1010,So won't it be better
> >>>> to distinguish it by can0 and can1 instead by simple "can" ?
> >>>
> >>> It looks like the way to do that is to assign a label to those devices
> >>> and then associate the label with an alias. I have no idea how that
> >>> works under the hood, but it is the way other files are set up. Take a
> >>> look at arch/powerpc/boot/dts/bamboo.dts for how they define the serial
> >>> interfaces.
> >>>
> >>> Grant or Wolfgang, is that the right way to handle the concern about
> >>> names or does it have no practical effect with the Linux kernel?
> >>
> >> It has not effect. The label is just if you need to reference it via some other means.
> >
> > Does the alias have an effect?
>
> nope
Then how does the device number get associated with a particular device
and how is user-space ensured a consistent namespace?
Robin
^ permalink raw reply
* Re: [PATCH v11 5/5] powerpc: Fix up fsl-flexcan device tree binding.
From: Robin Holt @ 2011-08-10 17:19 UTC (permalink / raw)
To: Scott Wood
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w,
netdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ, U Bhaskar-B22300,
Kumar Gala, Grant Likely, Marc Kleine-Budde, PPC list,
Wolfgang Grandegger
In-Reply-To: <4E42B83C.2040705-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
On Wed, Aug 10, 2011 at 11:56:28AM -0500, Scott Wood wrote:
> On 08/10/2011 11:27 AM, Robin Holt wrote:
> > -CPI Clock- Can Protocol Interface Clock
> > - This CLK_SRC bit of CTRL(control register) selects the clock source to
> > - the CAN Protocol Interface(CPI) to be either the peripheral clock
> > - (driven by the PLL) or the crystal oscillator clock. The selected clock
> > - is the one fed to the prescaler to generate the Serial Clock (Sclock).
> > - The PRESDIV field of CTRL(control register) controls a prescaler that
> > - generates the Serial Clock (Sclock), whose period defines the
> > - time quantum used to compose the CAN waveform.
> > +- compatible : Should be "fsl,flexcan" and optionally
> > + "fsl,flexcan-<processor>"
>
> fsl,<processor>-flexcan, and it should not be optional, and should come
> before "fsl,flexcan".
>
> Also may want to list fsl,p1010-rdb as a "canonical compatible" for
> anything which is backwards compatible with p1010's implementation.
How do I specify 'canonical compatible'? What would be the use of it
in that implementation?
Robin
^ permalink raw reply
* Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.
From: Kumar Gala @ 2011-08-10 17:17 UTC (permalink / raw)
To: Robin Holt
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
Wood Scott-B07421, U Bhaskar-B22300, PPC list,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
In-Reply-To: <20110810171600.GV4926-sJ/iWh9BUns@public.gmane.org>
On Aug 10, 2011, at 12:16 PM, Robin Holt wrote:
> On Wed, Aug 10, 2011 at 11:53:15AM -0500, Kumar Gala wrote:
>>
>> On Aug 10, 2011, at 11:00 AM, Robin Holt wrote:
>>
>>> On Wed, Aug 10, 2011 at 02:36:20PM +0000, U Bhaskar-B22300 wrote:
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: Robin Holt [mailto:holt-sJ/iWh9BUns@public.gmane.org]
>>>>> Sent: Wednesday, August 10, 2011 7:46 PM
>>>>> To: Wolfgang Grandegger
>>>>> Cc: Robin Holt; Marc Kleine-Budde; U Bhaskar-B22300; Wood Scott-B07421;
>>>>> netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; Kumar Gala; socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org; PPC
>>>>> list
>>>>> Subject: Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree
>>>>> binding.
>>>>>
>>>>> On Wed, Aug 10, 2011 at 03:47:43PM +0200, Wolfgang Grandegger wrote:
>>>>>> Hi Robin,
>>>>>>
>>>>>> On 08/10/2011 05:06 AM, Robin Holt wrote:
>>>>>>> In working with the socketcan developers, we have come to the
>>>>>>> conclusion the Documentation...fsl-flexcan.txt device tree
>>>>>>> documentation needs to be cleaned up. The driver does not depend
>>>>>>> upon any properties other
>>>>>>
>>>>>> Your first sentence could be misleading. Please just describe what the
>>>>>> patch does and why, something like:
>>>>>>
>>>>>> "This patch cleans up the documentation of the device-tree binding for
>>>>>> the Flexcan devices on Freescale's PowerPC and ARM cores. Extra
>>>>>> properties are not needed as the frequency of the source clock is
>>>>>> fixed..." and so on.
>>>>>
>>>>> I borrowed heavily from your message. ;)
>>>>>
>>>>>>> than the required properties so we are removing the file.
>>>>>>> Additionally, the p1010*dts* files are not following the standard
>>>>>>> for node naming in that they have a trailing -v1.0.
>>>>>>
>>>>>>> Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
>>>>>>> To: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
>>>>>>> To: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>,
>>>>>>> To: U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
>>>>>>> To: Scott Wood <scottwood-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
>>>>>>> Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
>>>>>>> Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
>>>>>>> Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
>>>>>>> Cc: Kumar Gala <galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
>>>>>>> ---
>>>>>>> .../devicetree/bindings/net/can/fsl-flexcan.txt | 61 ----------
>>>>> ----------
>>>>>>> arch/powerpc/boot/dts/p1010rdb.dts | 8 ---
>>>>>>> arch/powerpc/boot/dts/p1010si.dtsi | 8 +-
>>>>>>> 3 files changed, 4 insertions(+), 73 deletions(-) delete mode
>>>>>>> 100644 Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
>>>>>>>
>>>>>>> diff --git
>>>>>>> a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
>>>>>>> b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
>>>>>>> deleted file mode 100644
>>>>>>> index 1a729f0..0000000
>>>>>>> --- a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
>>>>>>> +++ /dev/null
>>>>>>> @@ -1,61 +0,0 @@
>>>>>>> -CAN Device Tree Bindings
>>>>>>> -------------------------
>>>>>>> -2011 Freescale Semiconductor, Inc.
>>>>>>> -
>>>>>>> -fsl,flexcan-v1.0 nodes
>>>>>>> ------------------------
>>>>>>> -In addition to the required compatible-, reg- and
>>>>>>> interrupt-properties, you can -also specify which clock source shall
>>>>> be used for the controller.
>>>>>>> -
>>>>>>> -CPI Clock- Can Protocol Interface Clock
>>>>>>> - This CLK_SRC bit of CTRL(control register) selects the clock source
>>>>> to
>>>>>>> - the CAN Protocol Interface(CPI) to be either the peripheral clock
>>>>>>> - (driven by the PLL) or the crystal oscillator clock. The selected
>>>>> clock
>>>>>>> - is the one fed to the prescaler to generate the Serial Clock
>>>>> (Sclock).
>>>>>>> - The PRESDIV field of CTRL(control register) controls a prescaler
>>>>> that
>>>>>>> - generates the Serial Clock (Sclock), whose period defines the
>>>>>>> - time quantum used to compose the CAN waveform.
>>>>>>> -
>>>>>>> -Can Engine Clock Source
>>>>>>> - There are two sources for CAN clock
>>>>>>> - - Platform Clock It represents the bus clock
>>>>>>> - - Oscillator Clock
>>>>>>> -
>>>>>>> - Peripheral Clock (PLL)
>>>>>>> - --------------
>>>>>>> - |
>>>>>>> - --------- -------------
>>>>>>> - | |CPI Clock | Prescaler | Sclock
>>>>>>> - | |---------------->| (1.. 256) |------------>
>>>>>>> - --------- -------------
>>>>>>> - | |
>>>>>>> - -------------- ---------------------CLK_SRC
>>>>>>> - Oscillator Clock
>>>>>>> -
>>>>>>> -- fsl,flexcan-clock-source : CAN Engine Clock Source.This property
>>>>> selects
>>>>>>> - the peripheral clock. PLL clock is fed to the
>>>>>>> - prescaler to generate the Serial Clock (Sclock).
>>>>>>> - Valid values are "oscillator" and "platform"
>>>>>>> - "oscillator": CAN engine clock source is
>>>>> oscillator clock.
>>>>>>> - "platform" The CAN engine clock source is the bus
>>>>> clock
>>>>>>> - (platform clock).
>>>>>>> -
>>>>>>> -- fsl,flexcan-clock-divider : for the reference and system clock, an
>>>>> additional
>>>>>>> - clock divider can be specified.
>>>>>>> -- clock-frequency: frequency required to calculate the bitrate for
>>>>> FlexCAN.
>>>>>>> -
>>>>>>> -Note:
>>>>>>> - - v1.0 of flexcan-v1.0 represent the IP block version for P1010
>>>>> SOC.
>>>>>>> - - P1010 does not have oscillator as the Clock Source.So the default
>>>>>>> - Clock Source is platform clock.
>>>>>>> -Examples:
>>>>>>> -
>>>>>>> - can0@1c000 {
>>>>>>> - compatible = "fsl,flexcan-v1.0";
>>>>>>> - reg = <0x1c000 0x1000>;
>>>>>>> - interrupts = <48 0x2>;
>>>>>>> - interrupt-parent = <&mpic>;
>>>>>>> - fsl,flexcan-clock-source = "platform";
>>>>>>> - fsl,flexcan-clock-divqider = <2>;
>>>>>>> - clock-frequency = <fixed by u-boot>;
>>>>>>> - };
>>>>>>
>>>>>> Do we really want to drop the documentation for that binding. I think
>>>>>> something like the following text would be still useful:
>>>>>>
>>>>>> ------------------------
>>>>>> Flexcan CAN contoller on Freescale's ARM and PowerPC processors
>>>>>>
>>>>>> Required properties:
>>>>>>
>>>>>> - compatible : Should be "fsl,flexcan" and optionally
>>>>>> "fsl,flexcan-<processor>"
>>>>>> - reg : Offset and length of the register set for this device
>>>>>> - interrupts : Interrupt tuple for this device
>>>>>>
>>>>>> Example:
>>>>>>
>>>>>> can@1c000 {
>>>>>> compatible = "fsl,p1010-flexcan", "fsl,flexcan";
>>>>>> reg = <0x1c000 0x1000>;
>>>>>> interrupts = <48 0x2>;
>>>>>> interrupt-parent = <&mpic>;
>>>>>> };
>>>>>> -------------------------
>>>>>
>>>>> Done, except the
>>>>>> compatible = "fsl,p1010-flexcan", "fsl,flexcan";
>>>>>
>>>>> line is
>>>>> compatible = "fsl,flexcan", "fsl,flexcan-p1010";
>>>>>
>>>>>>
>>>>>> What do you think?
>>>>>>
>>>>>>> diff --git a/arch/powerpc/boot/dts/p1010rdb.dts
>>>>>>> b/arch/powerpc/boot/dts/p1010rdb.dts
>>>>>>> index 6b33b73..d6a0bb2 100644
>>>>>>> --- a/arch/powerpc/boot/dts/p1010rdb.dts
>>>>>>> +++ b/arch/powerpc/boot/dts/p1010rdb.dts
>>>>>>> @@ -169,14 +169,6 @@
>>>>>>> };
>>>>>>> };
>>>>>>>
>>>>>>> - can0@1c000 {
>>>>>>> - fsl,flexcan-clock-source = "platform";
>>>>>>> - };
>>>>>>> -
>>>>>>> - can1@1d000 {
>>>>>>> - fsl,flexcan-clock-source = "platform";
>>>>>>> - };
>>>>>>> -
>>>>>>> usb@22000 {
>>>>>>> phy_type = "utmi";
>>>>>>> };
>>>>>>> diff --git a/arch/powerpc/boot/dts/p1010si.dtsi
>>>>>>> b/arch/powerpc/boot/dts/p1010si.dtsi
>>>>>>> index 7f51104..20c396d 100644
>>>>>>> --- a/arch/powerpc/boot/dts/p1010si.dtsi
>>>>>>> +++ b/arch/powerpc/boot/dts/p1010si.dtsi
>>>>>>> @@ -141,19 +141,19 @@
>>>>>>> };
>>>>>>>
>>>>>>> can0@1c000 {
>>>>>>> - compatible = "fsl,flexcan-v1.0";
>>>>>>> + compatible = "fsl,p1010-flexcan",
>>>>>>> + "fsl,flexcan";
>>>>>>
>>>>>> Does fit on one line.
>>>>>>
>>>>>>> reg = <0x1c000 0x1000>;
>>>>>>> interrupts = <48 0x2>;
>>>>>>> interrupt-parent = <&mpic>;
>>>>>>> - fsl,flexcan-clock-divider = <2>;
>>>>>>> };
>>>>>>>
>>>>>>> can1@1d000 {
>>>>>>> - compatible = "fsl,flexcan-v1.0";
>>>>>>> + compatible = "fsl,p1010-flexcan",
>>>>>>> + "fsl,flexcan";
>>>>>>
>>>>>> Ditto
>>>>>>
>>>>>>> reg = <0x1d000 0x1000>;
>>>>>>> interrupts = <61 0x2>;
>>>>>>> interrupt-parent = <&mpic>;
>>>>>>> - fsl,flexcan-clock-divider = <2>;
>>>>>>> };
>>>>>>>
>>>>>>> L2: l2-cache-controller@20000 {
>>>>>>
>>>>>> Please also correct the node names (not using the number suffix).
>>>>>
>>>>> So the node names should be
>>>>> can@1c000 {
>>>>> can@1d000 {
>>>>> correct?
>>>>>
>>>> [Bhaskar] As there are two CAN controllers on P1010,So won't it be better
>>>> to distinguish it by can0 and can1 instead by simple "can" ?
>>>
>>> It looks like the way to do that is to assign a label to those devices
>>> and then associate the label with an alias. I have no idea how that
>>> works under the hood, but it is the way other files are set up. Take a
>>> look at arch/powerpc/boot/dts/bamboo.dts for how they define the serial
>>> interfaces.
>>>
>>> Grant or Wolfgang, is that the right way to handle the concern about
>>> names or does it have no practical effect with the Linux kernel?
>>
>> It has not effect. The label is just if you need to reference it via some other means.
>
> Does the alias have an effect?
nope
- k
^ permalink raw reply
* Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.
From: Robin Holt @ 2011-08-10 17:16 UTC (permalink / raw)
To: Kumar Gala
Cc: Wood Scott-B07421, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
U Bhaskar-B22300,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org, PPC list
In-Reply-To: <63306A24-3FBF-4DAA-A0B9-6005F56BB76F-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
On Wed, Aug 10, 2011 at 11:53:15AM -0500, Kumar Gala wrote:
>
> On Aug 10, 2011, at 11:00 AM, Robin Holt wrote:
>
> > On Wed, Aug 10, 2011 at 02:36:20PM +0000, U Bhaskar-B22300 wrote:
> >>
> >>
> >>> -----Original Message-----
> >>> From: Robin Holt [mailto:holt-sJ/iWh9BUns@public.gmane.org]
> >>> Sent: Wednesday, August 10, 2011 7:46 PM
> >>> To: Wolfgang Grandegger
> >>> Cc: Robin Holt; Marc Kleine-Budde; U Bhaskar-B22300; Wood Scott-B07421;
> >>> netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; Kumar Gala; socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org; PPC
> >>> list
> >>> Subject: Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree
> >>> binding.
> >>>
> >>> On Wed, Aug 10, 2011 at 03:47:43PM +0200, Wolfgang Grandegger wrote:
> >>>> Hi Robin,
> >>>>
> >>>> On 08/10/2011 05:06 AM, Robin Holt wrote:
> >>>>> In working with the socketcan developers, we have come to the
> >>>>> conclusion the Documentation...fsl-flexcan.txt device tree
> >>>>> documentation needs to be cleaned up. The driver does not depend
> >>>>> upon any properties other
> >>>>
> >>>> Your first sentence could be misleading. Please just describe what the
> >>>> patch does and why, something like:
> >>>>
> >>>> "This patch cleans up the documentation of the device-tree binding for
> >>>> the Flexcan devices on Freescale's PowerPC and ARM cores. Extra
> >>>> properties are not needed as the frequency of the source clock is
> >>>> fixed..." and so on.
> >>>
> >>> I borrowed heavily from your message. ;)
> >>>
> >>>>> than the required properties so we are removing the file.
> >>>>> Additionally, the p1010*dts* files are not following the standard
> >>>>> for node naming in that they have a trailing -v1.0.
> >>>>
> >>>>> Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
> >>>>> To: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
> >>>>> To: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>,
> >>>>> To: U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> >>>>> To: Scott Wood <scottwood-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> >>>>> Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
> >>>>> Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
> >>>>> Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
> >>>>> Cc: Kumar Gala <galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
> >>>>> ---
> >>>>> .../devicetree/bindings/net/can/fsl-flexcan.txt | 61 ----------
> >>> ----------
> >>>>> arch/powerpc/boot/dts/p1010rdb.dts | 8 ---
> >>>>> arch/powerpc/boot/dts/p1010si.dtsi | 8 +-
> >>>>> 3 files changed, 4 insertions(+), 73 deletions(-) delete mode
> >>>>> 100644 Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> >>>>>
> >>>>> diff --git
> >>>>> a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> >>>>> b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> >>>>> deleted file mode 100644
> >>>>> index 1a729f0..0000000
> >>>>> --- a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> >>>>> +++ /dev/null
> >>>>> @@ -1,61 +0,0 @@
> >>>>> -CAN Device Tree Bindings
> >>>>> -------------------------
> >>>>> -2011 Freescale Semiconductor, Inc.
> >>>>> -
> >>>>> -fsl,flexcan-v1.0 nodes
> >>>>> ------------------------
> >>>>> -In addition to the required compatible-, reg- and
> >>>>> interrupt-properties, you can -also specify which clock source shall
> >>> be used for the controller.
> >>>>> -
> >>>>> -CPI Clock- Can Protocol Interface Clock
> >>>>> - This CLK_SRC bit of CTRL(control register) selects the clock source
> >>> to
> >>>>> - the CAN Protocol Interface(CPI) to be either the peripheral clock
> >>>>> - (driven by the PLL) or the crystal oscillator clock. The selected
> >>> clock
> >>>>> - is the one fed to the prescaler to generate the Serial Clock
> >>> (Sclock).
> >>>>> - The PRESDIV field of CTRL(control register) controls a prescaler
> >>> that
> >>>>> - generates the Serial Clock (Sclock), whose period defines the
> >>>>> - time quantum used to compose the CAN waveform.
> >>>>> -
> >>>>> -Can Engine Clock Source
> >>>>> - There are two sources for CAN clock
> >>>>> - - Platform Clock It represents the bus clock
> >>>>> - - Oscillator Clock
> >>>>> -
> >>>>> - Peripheral Clock (PLL)
> >>>>> - --------------
> >>>>> - |
> >>>>> - --------- -------------
> >>>>> - | |CPI Clock | Prescaler | Sclock
> >>>>> - | |---------------->| (1.. 256) |------------>
> >>>>> - --------- -------------
> >>>>> - | |
> >>>>> - -------------- ---------------------CLK_SRC
> >>>>> - Oscillator Clock
> >>>>> -
> >>>>> -- fsl,flexcan-clock-source : CAN Engine Clock Source.This property
> >>> selects
> >>>>> - the peripheral clock. PLL clock is fed to the
> >>>>> - prescaler to generate the Serial Clock (Sclock).
> >>>>> - Valid values are "oscillator" and "platform"
> >>>>> - "oscillator": CAN engine clock source is
> >>> oscillator clock.
> >>>>> - "platform" The CAN engine clock source is the bus
> >>> clock
> >>>>> - (platform clock).
> >>>>> -
> >>>>> -- fsl,flexcan-clock-divider : for the reference and system clock, an
> >>> additional
> >>>>> - clock divider can be specified.
> >>>>> -- clock-frequency: frequency required to calculate the bitrate for
> >>> FlexCAN.
> >>>>> -
> >>>>> -Note:
> >>>>> - - v1.0 of flexcan-v1.0 represent the IP block version for P1010
> >>> SOC.
> >>>>> - - P1010 does not have oscillator as the Clock Source.So the default
> >>>>> - Clock Source is platform clock.
> >>>>> -Examples:
> >>>>> -
> >>>>> - can0@1c000 {
> >>>>> - compatible = "fsl,flexcan-v1.0";
> >>>>> - reg = <0x1c000 0x1000>;
> >>>>> - interrupts = <48 0x2>;
> >>>>> - interrupt-parent = <&mpic>;
> >>>>> - fsl,flexcan-clock-source = "platform";
> >>>>> - fsl,flexcan-clock-divqider = <2>;
> >>>>> - clock-frequency = <fixed by u-boot>;
> >>>>> - };
> >>>>
> >>>> Do we really want to drop the documentation for that binding. I think
> >>>> something like the following text would be still useful:
> >>>>
> >>>> ------------------------
> >>>> Flexcan CAN contoller on Freescale's ARM and PowerPC processors
> >>>>
> >>>> Required properties:
> >>>>
> >>>> - compatible : Should be "fsl,flexcan" and optionally
> >>>> "fsl,flexcan-<processor>"
> >>>> - reg : Offset and length of the register set for this device
> >>>> - interrupts : Interrupt tuple for this device
> >>>>
> >>>> Example:
> >>>>
> >>>> can@1c000 {
> >>>> compatible = "fsl,p1010-flexcan", "fsl,flexcan";
> >>>> reg = <0x1c000 0x1000>;
> >>>> interrupts = <48 0x2>;
> >>>> interrupt-parent = <&mpic>;
> >>>> };
> >>>> -------------------------
> >>>
> >>> Done, except the
> >>>> compatible = "fsl,p1010-flexcan", "fsl,flexcan";
> >>>
> >>> line is
> >>> compatible = "fsl,flexcan", "fsl,flexcan-p1010";
> >>>
> >>>>
> >>>> What do you think?
> >>>>
> >>>>> diff --git a/arch/powerpc/boot/dts/p1010rdb.dts
> >>>>> b/arch/powerpc/boot/dts/p1010rdb.dts
> >>>>> index 6b33b73..d6a0bb2 100644
> >>>>> --- a/arch/powerpc/boot/dts/p1010rdb.dts
> >>>>> +++ b/arch/powerpc/boot/dts/p1010rdb.dts
> >>>>> @@ -169,14 +169,6 @@
> >>>>> };
> >>>>> };
> >>>>>
> >>>>> - can0@1c000 {
> >>>>> - fsl,flexcan-clock-source = "platform";
> >>>>> - };
> >>>>> -
> >>>>> - can1@1d000 {
> >>>>> - fsl,flexcan-clock-source = "platform";
> >>>>> - };
> >>>>> -
> >>>>> usb@22000 {
> >>>>> phy_type = "utmi";
> >>>>> };
> >>>>> diff --git a/arch/powerpc/boot/dts/p1010si.dtsi
> >>>>> b/arch/powerpc/boot/dts/p1010si.dtsi
> >>>>> index 7f51104..20c396d 100644
> >>>>> --- a/arch/powerpc/boot/dts/p1010si.dtsi
> >>>>> +++ b/arch/powerpc/boot/dts/p1010si.dtsi
> >>>>> @@ -141,19 +141,19 @@
> >>>>> };
> >>>>>
> >>>>> can0@1c000 {
> >>>>> - compatible = "fsl,flexcan-v1.0";
> >>>>> + compatible = "fsl,p1010-flexcan",
> >>>>> + "fsl,flexcan";
> >>>>
> >>>> Does fit on one line.
> >>>>
> >>>>> reg = <0x1c000 0x1000>;
> >>>>> interrupts = <48 0x2>;
> >>>>> interrupt-parent = <&mpic>;
> >>>>> - fsl,flexcan-clock-divider = <2>;
> >>>>> };
> >>>>>
> >>>>> can1@1d000 {
> >>>>> - compatible = "fsl,flexcan-v1.0";
> >>>>> + compatible = "fsl,p1010-flexcan",
> >>>>> + "fsl,flexcan";
> >>>>
> >>>> Ditto
> >>>>
> >>>>> reg = <0x1d000 0x1000>;
> >>>>> interrupts = <61 0x2>;
> >>>>> interrupt-parent = <&mpic>;
> >>>>> - fsl,flexcan-clock-divider = <2>;
> >>>>> };
> >>>>>
> >>>>> L2: l2-cache-controller@20000 {
> >>>>
> >>>> Please also correct the node names (not using the number suffix).
> >>>
> >>> So the node names should be
> >>> can@1c000 {
> >>> can@1d000 {
> >>> correct?
> >>>
> >> [Bhaskar] As there are two CAN controllers on P1010,So won't it be better
> >> to distinguish it by can0 and can1 instead by simple "can" ?
> >
> > It looks like the way to do that is to assign a label to those devices
> > and then associate the label with an alias. I have no idea how that
> > works under the hood, but it is the way other files are set up. Take a
> > look at arch/powerpc/boot/dts/bamboo.dts for how they define the serial
> > interfaces.
> >
> > Grant or Wolfgang, is that the right way to handle the concern about
> > names or does it have no practical effect with the Linux kernel?
>
> It has not effect. The label is just if you need to reference it via some other means.
Does the alias have an effect?
Robin
^ permalink raw reply
* Re: [PATCH v11 4/5] powerpc: Add flexcan device support for p1010rdb.
From: Kumar Gala @ 2011-08-10 17:01 UTC (permalink / raw)
To: Robin Holt
Cc: netdev-u79uwXL29TY76Z2rM5mHXA, U Bhaskar-B22300,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w, Marc Kleine-Budde,
PPC list, Wolfgang Grandegger
In-Reply-To: <1312993670-23999-5-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
On Aug 10, 2011, at 11:27 AM, Robin Holt wrote:
> I added a simple clock source for the p1010rdb so the flexcan driver
> could determine a clock frequency. The p1010 flexcan device only has
> an oscillator of system bus frequency divided by 2.
>
> Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
> Acked-by: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
> Acked-by: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>,
> Cc: U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
> Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
> Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
> Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
> Cc: Kumar Gala <galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
> ---
> arch/powerpc/platforms/85xx/Kconfig | 2 +
> arch/powerpc/platforms/85xx/Makefile | 2 +
> arch/powerpc/platforms/85xx/clock.c | 52 ++++++++++++++++++++++++++++++++
> arch/powerpc/platforms/85xx/p1010rdb.c | 8 +++++
> 4 files changed, 64 insertions(+), 0 deletions(-)
> create mode 100644 arch/powerpc/platforms/85xx/clock.c
I dont understand how mpc85xx_clk_functions() ends up being associated with the frequency the flexcan is running at.
This either seems to global or I'm missing something.
I still think the clk / freq info should be in the device tree and handled in the driver and NOT arch/powerpc platform code.
- k
^ permalink raw reply
* Re: [PATCH v11 5/5] powerpc: Fix up fsl-flexcan device tree binding.
From: Scott Wood @ 2011-08-10 16:56 UTC (permalink / raw)
To: Robin Holt
Cc: Kumar Gala, Wolfgang Grandegger, U Bhaskar-B22300, Grant Likely,
Marc Kleine-Budde, socketcan-core, netdev, PPC list,
devicetree-discuss
In-Reply-To: <1312993670-23999-6-git-send-email-holt@sgi.com>
On 08/10/2011 11:27 AM, Robin Holt wrote:
> -CPI Clock- Can Protocol Interface Clock
> - This CLK_SRC bit of CTRL(control register) selects the clock source to
> - the CAN Protocol Interface(CPI) to be either the peripheral clock
> - (driven by the PLL) or the crystal oscillator clock. The selected clock
> - is the one fed to the prescaler to generate the Serial Clock (Sclock).
> - The PRESDIV field of CTRL(control register) controls a prescaler that
> - generates the Serial Clock (Sclock), whose period defines the
> - time quantum used to compose the CAN waveform.
> +- compatible : Should be "fsl,flexcan" and optionally
> + "fsl,flexcan-<processor>"
fsl,<processor>-flexcan, and it should not be optional, and should come
before "fsl,flexcan".
Also may want to list fsl,p1010-rdb as a "canonical compatible" for
anything which is backwards compatible with p1010's implementation.
-Scott
^ permalink raw reply
* Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.
From: Kumar Gala @ 2011-08-10 16:53 UTC (permalink / raw)
To: Robin Holt
Cc: Wood Scott-B07421, netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
U Bhaskar-B22300,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
Marc Kleine-Budde, PPC list, Wolfgang Grandegger
In-Reply-To: <20110810160054.GT4926-sJ/iWh9BUns@public.gmane.org>
On Aug 10, 2011, at 11:00 AM, Robin Holt wrote:
> On Wed, Aug 10, 2011 at 02:36:20PM +0000, U Bhaskar-B22300 wrote:
>>
>>
>>> -----Original Message-----
>>> From: Robin Holt [mailto:holt-sJ/iWh9BUns@public.gmane.org]
>>> Sent: Wednesday, August 10, 2011 7:46 PM
>>> To: Wolfgang Grandegger
>>> Cc: Robin Holt; Marc Kleine-Budde; U Bhaskar-B22300; Wood Scott-B07421;
>>> netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org; Kumar Gala; socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org; PPC
>>> list
>>> Subject: Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree
>>> binding.
>>>
>>> On Wed, Aug 10, 2011 at 03:47:43PM +0200, Wolfgang Grandegger wrote:
>>>> Hi Robin,
>>>>
>>>> On 08/10/2011 05:06 AM, Robin Holt wrote:
>>>>> In working with the socketcan developers, we have come to the
>>>>> conclusion the Documentation...fsl-flexcan.txt device tree
>>>>> documentation needs to be cleaned up. The driver does not depend
>>>>> upon any properties other
>>>>
>>>> Your first sentence could be misleading. Please just describe what the
>>>> patch does and why, something like:
>>>>
>>>> "This patch cleans up the documentation of the device-tree binding for
>>>> the Flexcan devices on Freescale's PowerPC and ARM cores. Extra
>>>> properties are not needed as the frequency of the source clock is
>>>> fixed..." and so on.
>>>
>>> I borrowed heavily from your message. ;)
>>>
>>>>> than the required properties so we are removing the file.
>>>>> Additionally, the p1010*dts* files are not following the standard
>>>>> for node naming in that they have a trailing -v1.0.
>>>>
>>>>> Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
>>>>> To: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
>>>>> To: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>,
>>>>> To: U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
>>>>> To: Scott Wood <scottwood-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
>>>>> Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
>>>>> Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
>>>>> Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
>>>>> Cc: Kumar Gala <galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
>>>>> ---
>>>>> .../devicetree/bindings/net/can/fsl-flexcan.txt | 61 ----------
>>> ----------
>>>>> arch/powerpc/boot/dts/p1010rdb.dts | 8 ---
>>>>> arch/powerpc/boot/dts/p1010si.dtsi | 8 +-
>>>>> 3 files changed, 4 insertions(+), 73 deletions(-) delete mode
>>>>> 100644 Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
>>>>>
>>>>> diff --git
>>>>> a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
>>>>> b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
>>>>> deleted file mode 100644
>>>>> index 1a729f0..0000000
>>>>> --- a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
>>>>> +++ /dev/null
>>>>> @@ -1,61 +0,0 @@
>>>>> -CAN Device Tree Bindings
>>>>> -------------------------
>>>>> -2011 Freescale Semiconductor, Inc.
>>>>> -
>>>>> -fsl,flexcan-v1.0 nodes
>>>>> ------------------------
>>>>> -In addition to the required compatible-, reg- and
>>>>> interrupt-properties, you can -also specify which clock source shall
>>> be used for the controller.
>>>>> -
>>>>> -CPI Clock- Can Protocol Interface Clock
>>>>> - This CLK_SRC bit of CTRL(control register) selects the clock source
>>> to
>>>>> - the CAN Protocol Interface(CPI) to be either the peripheral clock
>>>>> - (driven by the PLL) or the crystal oscillator clock. The selected
>>> clock
>>>>> - is the one fed to the prescaler to generate the Serial Clock
>>> (Sclock).
>>>>> - The PRESDIV field of CTRL(control register) controls a prescaler
>>> that
>>>>> - generates the Serial Clock (Sclock), whose period defines the
>>>>> - time quantum used to compose the CAN waveform.
>>>>> -
>>>>> -Can Engine Clock Source
>>>>> - There are two sources for CAN clock
>>>>> - - Platform Clock It represents the bus clock
>>>>> - - Oscillator Clock
>>>>> -
>>>>> - Peripheral Clock (PLL)
>>>>> - --------------
>>>>> - |
>>>>> - --------- -------------
>>>>> - | |CPI Clock | Prescaler | Sclock
>>>>> - | |---------------->| (1.. 256) |------------>
>>>>> - --------- -------------
>>>>> - | |
>>>>> - -------------- ---------------------CLK_SRC
>>>>> - Oscillator Clock
>>>>> -
>>>>> -- fsl,flexcan-clock-source : CAN Engine Clock Source.This property
>>> selects
>>>>> - the peripheral clock. PLL clock is fed to the
>>>>> - prescaler to generate the Serial Clock (Sclock).
>>>>> - Valid values are "oscillator" and "platform"
>>>>> - "oscillator": CAN engine clock source is
>>> oscillator clock.
>>>>> - "platform" The CAN engine clock source is the bus
>>> clock
>>>>> - (platform clock).
>>>>> -
>>>>> -- fsl,flexcan-clock-divider : for the reference and system clock, an
>>> additional
>>>>> - clock divider can be specified.
>>>>> -- clock-frequency: frequency required to calculate the bitrate for
>>> FlexCAN.
>>>>> -
>>>>> -Note:
>>>>> - - v1.0 of flexcan-v1.0 represent the IP block version for P1010
>>> SOC.
>>>>> - - P1010 does not have oscillator as the Clock Source.So the default
>>>>> - Clock Source is platform clock.
>>>>> -Examples:
>>>>> -
>>>>> - can0@1c000 {
>>>>> - compatible = "fsl,flexcan-v1.0";
>>>>> - reg = <0x1c000 0x1000>;
>>>>> - interrupts = <48 0x2>;
>>>>> - interrupt-parent = <&mpic>;
>>>>> - fsl,flexcan-clock-source = "platform";
>>>>> - fsl,flexcan-clock-divqider = <2>;
>>>>> - clock-frequency = <fixed by u-boot>;
>>>>> - };
>>>>
>>>> Do we really want to drop the documentation for that binding. I think
>>>> something like the following text would be still useful:
>>>>
>>>> ------------------------
>>>> Flexcan CAN contoller on Freescale's ARM and PowerPC processors
>>>>
>>>> Required properties:
>>>>
>>>> - compatible : Should be "fsl,flexcan" and optionally
>>>> "fsl,flexcan-<processor>"
>>>> - reg : Offset and length of the register set for this device
>>>> - interrupts : Interrupt tuple for this device
>>>>
>>>> Example:
>>>>
>>>> can@1c000 {
>>>> compatible = "fsl,p1010-flexcan", "fsl,flexcan";
>>>> reg = <0x1c000 0x1000>;
>>>> interrupts = <48 0x2>;
>>>> interrupt-parent = <&mpic>;
>>>> };
>>>> -------------------------
>>>
>>> Done, except the
>>>> compatible = "fsl,p1010-flexcan", "fsl,flexcan";
>>>
>>> line is
>>> compatible = "fsl,flexcan", "fsl,flexcan-p1010";
>>>
>>>>
>>>> What do you think?
>>>>
>>>>> diff --git a/arch/powerpc/boot/dts/p1010rdb.dts
>>>>> b/arch/powerpc/boot/dts/p1010rdb.dts
>>>>> index 6b33b73..d6a0bb2 100644
>>>>> --- a/arch/powerpc/boot/dts/p1010rdb.dts
>>>>> +++ b/arch/powerpc/boot/dts/p1010rdb.dts
>>>>> @@ -169,14 +169,6 @@
>>>>> };
>>>>> };
>>>>>
>>>>> - can0@1c000 {
>>>>> - fsl,flexcan-clock-source = "platform";
>>>>> - };
>>>>> -
>>>>> - can1@1d000 {
>>>>> - fsl,flexcan-clock-source = "platform";
>>>>> - };
>>>>> -
>>>>> usb@22000 {
>>>>> phy_type = "utmi";
>>>>> };
>>>>> diff --git a/arch/powerpc/boot/dts/p1010si.dtsi
>>>>> b/arch/powerpc/boot/dts/p1010si.dtsi
>>>>> index 7f51104..20c396d 100644
>>>>> --- a/arch/powerpc/boot/dts/p1010si.dtsi
>>>>> +++ b/arch/powerpc/boot/dts/p1010si.dtsi
>>>>> @@ -141,19 +141,19 @@
>>>>> };
>>>>>
>>>>> can0@1c000 {
>>>>> - compatible = "fsl,flexcan-v1.0";
>>>>> + compatible = "fsl,p1010-flexcan",
>>>>> + "fsl,flexcan";
>>>>
>>>> Does fit on one line.
>>>>
>>>>> reg = <0x1c000 0x1000>;
>>>>> interrupts = <48 0x2>;
>>>>> interrupt-parent = <&mpic>;
>>>>> - fsl,flexcan-clock-divider = <2>;
>>>>> };
>>>>>
>>>>> can1@1d000 {
>>>>> - compatible = "fsl,flexcan-v1.0";
>>>>> + compatible = "fsl,p1010-flexcan",
>>>>> + "fsl,flexcan";
>>>>
>>>> Ditto
>>>>
>>>>> reg = <0x1d000 0x1000>;
>>>>> interrupts = <61 0x2>;
>>>>> interrupt-parent = <&mpic>;
>>>>> - fsl,flexcan-clock-divider = <2>;
>>>>> };
>>>>>
>>>>> L2: l2-cache-controller@20000 {
>>>>
>>>> Please also correct the node names (not using the number suffix).
>>>
>>> So the node names should be
>>> can@1c000 {
>>> can@1d000 {
>>> correct?
>>>
>> [Bhaskar] As there are two CAN controllers on P1010,So won't it be better
>> to distinguish it by can0 and can1 instead by simple "can" ?
>
> It looks like the way to do that is to assign a label to those devices
> and then associate the label with an alias. I have no idea how that
> works under the hood, but it is the way other files are set up. Take a
> look at arch/powerpc/boot/dts/bamboo.dts for how they define the serial
> interfaces.
>
> Grant or Wolfgang, is that the right way to handle the concern about
> names or does it have no practical effect with the Linux kernel?
It has not effect. The label is just if you need to reference it via some other means.
- k
^ permalink raw reply
* [PATCH v11 2/5] flexcan: Abstract off read/write for big/little endian.
From: Robin Holt @ 2011-08-10 16:27 UTC (permalink / raw)
To: Robin Holt, Kumar Gala, Wolfgang Grandegger, U Bhaskar-B22300
Cc: Robin Holt, Marc Kleine-Budde, Wolfgang Grandegger,
U Bhaskar-B22300, socketcan-core, netdev, PPC list
In-Reply-To: <1312993670-23999-1-git-send-email-holt@sgi.com>
Make flexcan driver handle register reads in the appropriate endianess.
This was a basic search and replace and then define some inlines.
Signed-off-by: Robin Holt <holt@sgi.com>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Cc: U Bhaskar-B22300 <B22300@freescale.com>
Cc: socketcan-core@lists.berlios.de
Cc: netdev@vger.kernel.org
Cc: PPC list <linuxppc-dev@lists.ozlabs.org>
---
drivers/net/can/flexcan.c | 140 ++++++++++++++++++++++++++------------------
1 files changed, 83 insertions(+), 57 deletions(-)
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 586b2cd..68cbe52 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -190,6 +190,31 @@ static struct can_bittiming_const flexcan_bittiming_const = {
};
/*
+ * Abstract off the read/write for arm versus ppc.
+ */
+#if defined(__BIG_ENDIAN)
+static inline u32 flexcan_read(void __iomem *addr)
+{
+ return in_be32(addr);
+}
+
+static inline void flexcan_write(u32 val, void __iomem *addr)
+{
+ out_be32(addr, val);
+}
+#else
+static inline u32 flexcan_read(void __iomem *addr)
+{
+ return readl(addr);
+}
+
+static inline void flexcan_write(u32 val, void __iomem *addr)
+{
+ writel(val, addr);
+}
+#endif
+
+/*
* Swtich transceiver on or off
*/
static void flexcan_transceiver_switch(const struct flexcan_priv *priv, int on)
@@ -210,9 +235,9 @@ static inline void flexcan_chip_enable(struct flexcan_priv *priv)
struct flexcan_regs __iomem *regs = priv->base;
u32 reg;
- reg = readl(®s->mcr);
+ reg = flexcan_read(®s->mcr);
reg &= ~FLEXCAN_MCR_MDIS;
- writel(reg, ®s->mcr);
+ flexcan_write(reg, ®s->mcr);
udelay(10);
}
@@ -222,9 +247,9 @@ static inline void flexcan_chip_disable(struct flexcan_priv *priv)
struct flexcan_regs __iomem *regs = priv->base;
u32 reg;
- reg = readl(®s->mcr);
+ reg = flexcan_read(®s->mcr);
reg |= FLEXCAN_MCR_MDIS;
- writel(reg, ®s->mcr);
+ flexcan_write(reg, ®s->mcr);
}
static int flexcan_get_berr_counter(const struct net_device *dev,
@@ -232,7 +257,7 @@ static int flexcan_get_berr_counter(const struct net_device *dev,
{
const struct flexcan_priv *priv = netdev_priv(dev);
struct flexcan_regs __iomem *regs = priv->base;
- u32 reg = readl(®s->ecr);
+ u32 reg = flexcan_read(®s->ecr);
bec->txerr = (reg >> 0) & 0xff;
bec->rxerr = (reg >> 8) & 0xff;
@@ -266,15 +291,15 @@ static int flexcan_start_xmit(struct sk_buff *skb, struct net_device *dev)
if (cf->can_dlc > 0) {
u32 data = be32_to_cpup((__be32 *)&cf->data[0]);
- writel(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[0]);
+ flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[0]);
}
if (cf->can_dlc > 3) {
u32 data = be32_to_cpup((__be32 *)&cf->data[4]);
- writel(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]);
+ flexcan_write(data, ®s->cantxfg[FLEXCAN_TX_BUF_ID].data[1]);
}
- writel(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id);
- writel(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl);
+ flexcan_write(can_id, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_id);
+ flexcan_write(ctrl, ®s->cantxfg[FLEXCAN_TX_BUF_ID].can_ctrl);
kfree_skb(skb);
@@ -462,8 +487,8 @@ static void flexcan_read_fifo(const struct net_device *dev,
struct flexcan_mb __iomem *mb = ®s->cantxfg[0];
u32 reg_ctrl, reg_id;
- reg_ctrl = readl(&mb->can_ctrl);
- reg_id = readl(&mb->can_id);
+ reg_ctrl = flexcan_read(&mb->can_ctrl);
+ reg_id = flexcan_read(&mb->can_id);
if (reg_ctrl & FLEXCAN_MB_CNT_IDE)
cf->can_id = ((reg_id >> 0) & CAN_EFF_MASK) | CAN_EFF_FLAG;
else
@@ -473,12 +498,12 @@ static void flexcan_read_fifo(const struct net_device *dev,
cf->can_id |= CAN_RTR_FLAG;
cf->can_dlc = get_can_dlc((reg_ctrl >> 16) & 0xf);
- *(__be32 *)(cf->data + 0) = cpu_to_be32(readl(&mb->data[0]));
- *(__be32 *)(cf->data + 4) = cpu_to_be32(readl(&mb->data[1]));
+ *(__be32 *)(cf->data + 0) = cpu_to_be32(flexcan_read(&mb->data[0]));
+ *(__be32 *)(cf->data + 4) = cpu_to_be32(flexcan_read(&mb->data[1]));
/* mark as read */
- writel(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1);
- readl(®s->timer);
+ flexcan_write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->iflag1);
+ flexcan_read(®s->timer);
}
static int flexcan_read_frame(struct net_device *dev)
@@ -514,17 +539,17 @@ static int flexcan_poll(struct napi_struct *napi, int quota)
* The error bits are cleared on read,
* use saved value from irq handler.
*/
- reg_esr = readl(®s->esr) | priv->reg_esr;
+ reg_esr = flexcan_read(®s->esr) | priv->reg_esr;
/* handle state changes */
work_done += flexcan_poll_state(dev, reg_esr);
/* handle RX-FIFO */
- reg_iflag1 = readl(®s->iflag1);
+ reg_iflag1 = flexcan_read(®s->iflag1);
while (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_AVAILABLE &&
work_done < quota) {
work_done += flexcan_read_frame(dev);
- reg_iflag1 = readl(®s->iflag1);
+ reg_iflag1 = flexcan_read(®s->iflag1);
}
/* report bus errors */
@@ -534,8 +559,8 @@ static int flexcan_poll(struct napi_struct *napi, int quota)
if (work_done < quota) {
napi_complete(napi);
/* enable IRQs */
- writel(FLEXCAN_IFLAG_DEFAULT, ®s->imask1);
- writel(priv->reg_ctrl_default, ®s->ctrl);
+ flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1);
+ flexcan_write(priv->reg_ctrl_default, ®s->ctrl);
}
return work_done;
@@ -549,9 +574,9 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
struct flexcan_regs __iomem *regs = priv->base;
u32 reg_iflag1, reg_esr;
- reg_iflag1 = readl(®s->iflag1);
- reg_esr = readl(®s->esr);
- writel(FLEXCAN_ESR_ERR_INT, ®s->esr); /* ACK err IRQ */
+ reg_iflag1 = flexcan_read(®s->iflag1);
+ reg_esr = flexcan_read(®s->esr);
+ flexcan_write(FLEXCAN_ESR_ERR_INT, ®s->esr); /* ACK err IRQ */
/*
* schedule NAPI in case of:
@@ -567,16 +592,16 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
* save them for later use.
*/
priv->reg_esr = reg_esr & FLEXCAN_ESR_ERR_BUS;
- writel(FLEXCAN_IFLAG_DEFAULT & ~FLEXCAN_IFLAG_RX_FIFO_AVAILABLE,
- ®s->imask1);
- writel(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL,
+ flexcan_write(FLEXCAN_IFLAG_DEFAULT &
+ ~FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, ®s->imask1);
+ flexcan_write(priv->reg_ctrl_default & ~FLEXCAN_CTRL_ERR_ALL,
®s->ctrl);
napi_schedule(&priv->napi);
}
/* FIFO overflow */
if (reg_iflag1 & FLEXCAN_IFLAG_RX_FIFO_OVERFLOW) {
- writel(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1);
+ flexcan_write(FLEXCAN_IFLAG_RX_FIFO_OVERFLOW, ®s->iflag1);
dev->stats.rx_over_errors++;
dev->stats.rx_errors++;
}
@@ -585,7 +610,7 @@ static irqreturn_t flexcan_irq(int irq, void *dev_id)
if (reg_iflag1 & (1 << FLEXCAN_TX_BUF_ID)) {
/* tx_bytes is incremented in flexcan_start_xmit */
stats->tx_packets++;
- writel((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1);
+ flexcan_write((1 << FLEXCAN_TX_BUF_ID), ®s->iflag1);
netif_wake_queue(dev);
}
@@ -599,7 +624,7 @@ static void flexcan_set_bittiming(struct net_device *dev)
struct flexcan_regs __iomem *regs = priv->base;
u32 reg;
- reg = readl(®s->ctrl);
+ reg = flexcan_read(®s->ctrl);
reg &= ~(FLEXCAN_CTRL_PRESDIV(0xff) |
FLEXCAN_CTRL_RJW(0x3) |
FLEXCAN_CTRL_PSEG1(0x7) |
@@ -623,11 +648,11 @@ static void flexcan_set_bittiming(struct net_device *dev)
reg |= FLEXCAN_CTRL_SMP;
dev_info(dev->dev.parent, "writing ctrl=0x%08x\n", reg);
- writel(reg, ®s->ctrl);
+ flexcan_write(reg, ®s->ctrl);
/* print chip status */
dev_dbg(dev->dev.parent, "%s: mcr=0x%08x ctrl=0x%08x\n", __func__,
- readl(®s->mcr), readl(®s->ctrl));
+ flexcan_read(®s->mcr), flexcan_read(®s->ctrl));
}
/*
@@ -648,10 +673,10 @@ static int flexcan_chip_start(struct net_device *dev)
flexcan_chip_enable(priv);
/* soft reset */
- writel(FLEXCAN_MCR_SOFTRST, ®s->mcr);
+ flexcan_write(FLEXCAN_MCR_SOFTRST, ®s->mcr);
udelay(10);
- reg_mcr = readl(®s->mcr);
+ reg_mcr = flexcan_read(®s->mcr);
if (reg_mcr & FLEXCAN_MCR_SOFTRST) {
dev_err(dev->dev.parent,
"Failed to softreset can module (mcr=0x%08x)\n",
@@ -673,12 +698,12 @@ static int flexcan_chip_start(struct net_device *dev)
* choose format C
*
*/
- reg_mcr = readl(®s->mcr);
+ reg_mcr = flexcan_read(®s->mcr);
reg_mcr |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_FEN | FLEXCAN_MCR_HALT |
FLEXCAN_MCR_SUPV | FLEXCAN_MCR_WRN_EN |
FLEXCAN_MCR_IDAM_C;
dev_dbg(dev->dev.parent, "%s: writing mcr=0x%08x", __func__, reg_mcr);
- writel(reg_mcr, ®s->mcr);
+ flexcan_write(reg_mcr, ®s->mcr);
/*
* CTRL
@@ -696,7 +721,7 @@ static int flexcan_chip_start(struct net_device *dev)
* (FLEXCAN_CTRL_ERR_MSK), too. Otherwise we don't get any
* warning or bus passive interrupts.
*/
- reg_ctrl = readl(®s->ctrl);
+ reg_ctrl = flexcan_read(®s->ctrl);
reg_ctrl &= ~FLEXCAN_CTRL_TSYN;
reg_ctrl |= FLEXCAN_CTRL_BOFF_REC | FLEXCAN_CTRL_LBUF |
FLEXCAN_CTRL_ERR_STATE | FLEXCAN_CTRL_ERR_MSK;
@@ -704,38 +729,39 @@ static int flexcan_chip_start(struct net_device *dev)
/* save for later use */
priv->reg_ctrl_default = reg_ctrl;
dev_dbg(dev->dev.parent, "%s: writing ctrl=0x%08x", __func__, reg_ctrl);
- writel(reg_ctrl, ®s->ctrl);
+ flexcan_write(reg_ctrl, ®s->ctrl);
for (i = 0; i < ARRAY_SIZE(regs->cantxfg); i++) {
- writel(0, ®s->cantxfg[i].can_ctrl);
- writel(0, ®s->cantxfg[i].can_id);
- writel(0, ®s->cantxfg[i].data[0]);
- writel(0, ®s->cantxfg[i].data[1]);
+ flexcan_write(0, ®s->cantxfg[i].can_ctrl);
+ flexcan_write(0, ®s->cantxfg[i].can_id);
+ flexcan_write(0, ®s->cantxfg[i].data[0]);
+ flexcan_write(0, ®s->cantxfg[i].data[1]);
/* put MB into rx queue */
- writel(FLEXCAN_MB_CNT_CODE(0x4), ®s->cantxfg[i].can_ctrl);
+ flexcan_write(FLEXCAN_MB_CNT_CODE(0x4),
+ ®s->cantxfg[i].can_ctrl);
}
/* acceptance mask/acceptance code (accept everything) */
- writel(0x0, ®s->rxgmask);
- writel(0x0, ®s->rx14mask);
- writel(0x0, ®s->rx15mask);
+ flexcan_write(0x0, ®s->rxgmask);
+ flexcan_write(0x0, ®s->rx14mask);
+ flexcan_write(0x0, ®s->rx15mask);
flexcan_transceiver_switch(priv, 1);
/* synchronize with the can bus */
- reg_mcr = readl(®s->mcr);
+ reg_mcr = flexcan_read(®s->mcr);
reg_mcr &= ~FLEXCAN_MCR_HALT;
- writel(reg_mcr, ®s->mcr);
+ flexcan_write(reg_mcr, ®s->mcr);
priv->can.state = CAN_STATE_ERROR_ACTIVE;
/* enable FIFO interrupts */
- writel(FLEXCAN_IFLAG_DEFAULT, ®s->imask1);
+ flexcan_write(FLEXCAN_IFLAG_DEFAULT, ®s->imask1);
/* print chip status */
dev_dbg(dev->dev.parent, "%s: reading mcr=0x%08x ctrl=0x%08x\n",
- __func__, readl(®s->mcr), readl(®s->ctrl));
+ __func__, flexcan_read(®s->mcr), flexcan_read(®s->ctrl));
return 0;
@@ -757,12 +783,12 @@ static void flexcan_chip_stop(struct net_device *dev)
u32 reg;
/* Disable all interrupts */
- writel(0, ®s->imask1);
+ flexcan_write(0, ®s->imask1);
/* Disable + halt module */
- reg = readl(®s->mcr);
+ reg = flexcan_read(®s->mcr);
reg |= FLEXCAN_MCR_MDIS | FLEXCAN_MCR_HALT;
- writel(reg, ®s->mcr);
+ flexcan_write(reg, ®s->mcr);
flexcan_transceiver_switch(priv, 0);
priv->can.state = CAN_STATE_STOPPED;
@@ -854,24 +880,24 @@ static int __devinit register_flexcandev(struct net_device *dev)
/* select "bus clock", chip must be disabled */
flexcan_chip_disable(priv);
- reg = readl(®s->ctrl);
+ reg = flexcan_read(®s->ctrl);
reg |= FLEXCAN_CTRL_CLK_SRC;
- writel(reg, ®s->ctrl);
+ flexcan_write(reg, ®s->ctrl);
flexcan_chip_enable(priv);
/* set freeze, halt and activate FIFO, restrict register access */
- reg = readl(®s->mcr);
+ reg = flexcan_read(®s->mcr);
reg |= FLEXCAN_MCR_FRZ | FLEXCAN_MCR_HALT |
FLEXCAN_MCR_FEN | FLEXCAN_MCR_SUPV;
- writel(reg, ®s->mcr);
+ flexcan_write(reg, ®s->mcr);
/*
* Currently we only support newer versions of this core
* featuring a RX FIFO. Older cores found on some Coldfire
* derivates are not yet supported.
*/
- reg = readl(®s->mcr);
+ reg = flexcan_read(®s->mcr);
if (!(reg & FLEXCAN_MCR_FEN)) {
dev_err(dev->dev.parent,
"Could not enable RX FIFO, unsupported core\n");
--
1.7.2.1
^ permalink raw reply related
* [PATCH v11 5/5] powerpc: Fix up fsl-flexcan device tree binding.
From: Robin Holt @ 2011-08-10 16:27 UTC (permalink / raw)
To: Robin Holt, Kumar Gala, Wolfgang Grandegger, U Bhaskar-B22300,
Scott Wood
Cc: netdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w, Marc Kleine-Budde,
PPC list
In-Reply-To: <1312993670-23999-1-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
This patch cleans up the documentation of the device-tree binding for
the Flexcan devices on Freescale's PowerPC and ARM cores. Extra
properties are not needed as the frequency of the source clock is
fixed, there is not external divider beyond what the driver already
works with, and the clock source can not be selected.
Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
Acked-by: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
To: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>,
To: U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
To: Scott Wood <scottwood-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
To: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
To: Kumar Gala <galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
---
.../devicetree/bindings/net/can/fsl-flexcan.txt | 70 ++++----------------
arch/powerpc/boot/dts/p1010rdb.dts | 10 +--
arch/powerpc/boot/dts/p1010si.dtsi | 10 +--
3 files changed, 19 insertions(+), 71 deletions(-)
diff --git a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
index 1a729f0..869f4ca 100644
--- a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
+++ b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
@@ -1,61 +1,17 @@
-CAN Device Tree Bindings
-------------------------
-2011 Freescale Semiconductor, Inc.
+Flexcan CAN contoller on Freescale's ARM and PowerPC processors
-fsl,flexcan-v1.0 nodes
------------------------
-In addition to the required compatible-, reg- and interrupt-properties, you can
-also specify which clock source shall be used for the controller.
+Required properties:
-CPI Clock- Can Protocol Interface Clock
- This CLK_SRC bit of CTRL(control register) selects the clock source to
- the CAN Protocol Interface(CPI) to be either the peripheral clock
- (driven by the PLL) or the crystal oscillator clock. The selected clock
- is the one fed to the prescaler to generate the Serial Clock (Sclock).
- The PRESDIV field of CTRL(control register) controls a prescaler that
- generates the Serial Clock (Sclock), whose period defines the
- time quantum used to compose the CAN waveform.
+- compatible : Should be "fsl,flexcan" and optionally
+ "fsl,flexcan-<processor>"
+- reg : Offset and length of the register set for this device
+- interrupts : Interrupt tuple for this device
-Can Engine Clock Source
- There are two sources for CAN clock
- - Platform Clock It represents the bus clock
- - Oscillator Clock
+Example:
- Peripheral Clock (PLL)
- --------------
- |
- --------- -------------
- | |CPI Clock | Prescaler | Sclock
- | |---------------->| (1.. 256) |------------>
- --------- -------------
- | |
- -------------- ---------------------CLK_SRC
- Oscillator Clock
-
-- fsl,flexcan-clock-source : CAN Engine Clock Source.This property selects
- the peripheral clock. PLL clock is fed to the
- prescaler to generate the Serial Clock (Sclock).
- Valid values are "oscillator" and "platform"
- "oscillator": CAN engine clock source is oscillator clock.
- "platform" The CAN engine clock source is the bus clock
- (platform clock).
-
-- fsl,flexcan-clock-divider : for the reference and system clock, an additional
- clock divider can be specified.
-- clock-frequency: frequency required to calculate the bitrate for FlexCAN.
-
-Note:
- - v1.0 of flexcan-v1.0 represent the IP block version for P1010 SOC.
- - P1010 does not have oscillator as the Clock Source.So the default
- Clock Source is platform clock.
-Examples:
-
- can0@1c000 {
- compatible = "fsl,flexcan-v1.0";
- reg = <0x1c000 0x1000>;
- interrupts = <48 0x2>;
- interrupt-parent = <&mpic>;
- fsl,flexcan-clock-source = "platform";
- fsl,flexcan-clock-divider = <2>;
- clock-frequency = <fixed by u-boot>;
- };
+ can@1c000 {
+ compatible = "fsl,p1010-flexcan", "fsl,flexcan";
+ reg = <0x1c000 0x1000>;
+ interrupts = <48 0x2>;
+ interrupt-parent = <&mpic>;
+ };
diff --git a/arch/powerpc/boot/dts/p1010rdb.dts b/arch/powerpc/boot/dts/p1010rdb.dts
index 6b33b73..d6c669c 100644
--- a/arch/powerpc/boot/dts/p1010rdb.dts
+++ b/arch/powerpc/boot/dts/p1010rdb.dts
@@ -23,6 +23,8 @@
ethernet2 = &enet2;
pci0 = &pci0;
pci1 = &pci1;
+ can0 = &can0;
+ can1 = &can1;
};
memory {
@@ -169,14 +171,6 @@
};
};
- can0@1c000 {
- fsl,flexcan-clock-source = "platform";
- };
-
- can1@1d000 {
- fsl,flexcan-clock-source = "platform";
- };
-
usb@22000 {
phy_type = "utmi";
};
diff --git a/arch/powerpc/boot/dts/p1010si.dtsi b/arch/powerpc/boot/dts/p1010si.dtsi
index 7f51104..f00076b 100644
--- a/arch/powerpc/boot/dts/p1010si.dtsi
+++ b/arch/powerpc/boot/dts/p1010si.dtsi
@@ -140,20 +140,18 @@
interrupt-parent = <&mpic>;
};
- can0@1c000 {
- compatible = "fsl,flexcan-v1.0";
+ can0: can@1c000 {
+ compatible = "fsl,p1010-flexcan", "fsl,flexcan";
reg = <0x1c000 0x1000>;
interrupts = <48 0x2>;
interrupt-parent = <&mpic>;
- fsl,flexcan-clock-divider = <2>;
};
- can1@1d000 {
- compatible = "fsl,flexcan-v1.0";
+ can1: can@1d000 {
+ compatible = "fsl,p1010-flexcan", "fsl,flexcan";
reg = <0x1d000 0x1000>;
interrupts = <61 0x2>;
interrupt-parent = <&mpic>;
- fsl,flexcan-clock-divider = <2>;
};
L2: l2-cache-controller@20000 {
--
1.7.2.1
^ permalink raw reply related
* [PATCH v11 4/5] powerpc: Add flexcan device support for p1010rdb.
From: Robin Holt @ 2011-08-10 16:27 UTC (permalink / raw)
To: Robin Holt, Kumar Gala, Wolfgang Grandegger, U Bhaskar-B22300
Cc: netdev-u79uwXL29TY76Z2rM5mHXA, U Bhaskar-B22300, Kumar Gala,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w, Marc Kleine-Budde,
PPC list, Wolfgang Grandegger
In-Reply-To: <1312993670-23999-1-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
I added a simple clock source for the p1010rdb so the flexcan driver
could determine a clock frequency. The p1010 flexcan device only has
an oscillator of system bus frequency divided by 2.
Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
Acked-by: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>,
Acked-by: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>,
Cc: U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
Cc: Kumar Gala <galak-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
---
arch/powerpc/platforms/85xx/Kconfig | 2 +
arch/powerpc/platforms/85xx/Makefile | 2 +
arch/powerpc/platforms/85xx/clock.c | 52 ++++++++++++++++++++++++++++++++
arch/powerpc/platforms/85xx/p1010rdb.c | 8 +++++
4 files changed, 64 insertions(+), 0 deletions(-)
create mode 100644 arch/powerpc/platforms/85xx/clock.c
diff --git a/arch/powerpc/platforms/85xx/Kconfig b/arch/powerpc/platforms/85xx/Kconfig
index 498534c..c4304ae 100644
--- a/arch/powerpc/platforms/85xx/Kconfig
+++ b/arch/powerpc/platforms/85xx/Kconfig
@@ -70,6 +70,8 @@ config MPC85xx_RDB
config P1010_RDB
bool "Freescale P1010RDB"
select DEFAULT_UIMAGE
+ select HAVE_CAN_FLEXCAN if NET && CAN
+ select PPC_CLOCK if CAN_FLEXCAN
help
This option enables support for the MPC85xx RDB (P1010 RDB) board
diff --git a/arch/powerpc/platforms/85xx/Makefile b/arch/powerpc/platforms/85xx/Makefile
index a971b32..cc7f381 100644
--- a/arch/powerpc/platforms/85xx/Makefile
+++ b/arch/powerpc/platforms/85xx/Makefile
@@ -3,6 +3,8 @@
#
obj-$(CONFIG_SMP) += smp.o
+obj-$(CONFIG_PPC_CLOCK) += clock.o
+
obj-$(CONFIG_MPC8540_ADS) += mpc85xx_ads.o
obj-$(CONFIG_MPC8560_ADS) += mpc85xx_ads.o
obj-$(CONFIG_MPC85xx_CDS) += mpc85xx_cds.o
diff --git a/arch/powerpc/platforms/85xx/clock.c b/arch/powerpc/platforms/85xx/clock.c
new file mode 100644
index 0000000..0b6db1d
--- /dev/null
+++ b/arch/powerpc/platforms/85xx/clock.c
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2011 SGI, inc.
+ *
+ * This code is licensed for use under the GPL V2 as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/of.h>
+
+#include <asm/clk_interface.h>
+
+#include <sysdev/fsl_soc.h>
+
+/*
+ * p1010 needs to provide a clock source for the flexcan driver. The
+ * oscillator for the p1010 processor is only ever the system clock / 2.
+ */
+
+static struct clk *mpc85xx_clk_get(struct device *dev, const char *id)
+{
+ if (!dev)
+ return ERR_PTR(-ENOENT);
+
+ if (!dev->of_node ||
+ !of_device_is_compatible(dev->of_node, "fsl,flexcan"))
+ return ERR_PTR(-ENOENT);
+
+ return NULL;
+}
+
+static void mpc85xx_clk_put(struct clk *clk)
+{
+ return;
+}
+
+static unsigned long mpc85xx_clk_get_rate(struct clk *clk)
+{
+ return fsl_get_sys_freq() / 2;
+}
+
+static struct clk_interface mpc85xx_clk_functions = {
+ .clk_get = mpc85xx_clk_get,
+ .clk_get_rate = mpc85xx_clk_get_rate,
+ .clk_put = mpc85xx_clk_put,
+};
+
+void __init mpc85xx_clk_init(void)
+{
+ clk_functions = mpc85xx_clk_functions;
+}
diff --git a/arch/powerpc/platforms/85xx/p1010rdb.c b/arch/powerpc/platforms/85xx/p1010rdb.c
index d7387fa..5e52122 100644
--- a/arch/powerpc/platforms/85xx/p1010rdb.c
+++ b/arch/powerpc/platforms/85xx/p1010rdb.c
@@ -81,6 +81,13 @@ static void __init p1010_rdb_setup_arch(void)
printk(KERN_INFO "P1010 RDB board from Freescale Semiconductor\n");
}
+extern void mpc85xx_clk_init(void);
+
+static void __init p1010_rdb_init(void)
+{
+ mpc85xx_clk_init();
+}
+
static struct of_device_id __initdata p1010rdb_ids[] = {
{ .type = "soc", },
{ .compatible = "soc", },
@@ -111,6 +118,7 @@ define_machine(p1010_rdb) {
.name = "P1010 RDB",
.probe = p1010_rdb_probe,
.setup_arch = p1010_rdb_setup_arch,
+ .init = p1010_rdb_init,
.init_IRQ = p1010_rdb_pic_init,
#ifdef CONFIG_PCI
.pcibios_fixup_bus = fsl_pcibios_fixup_bus,
--
1.7.2.1
^ permalink raw reply related
* [PATCH v11 3/5] flexcan: Add of_match to platform_device definition.
From: Robin Holt @ 2011-08-10 16:27 UTC (permalink / raw)
To: Robin Holt, Kumar Gala, Wolfgang Grandegger, U Bhaskar-B22300
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w,
netdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ, U Bhaskar-B22300,
Grant Likely, Marc Kleine-Budde, PPC list, Wolfgang Grandegger
In-Reply-To: <1312993670-23999-1-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
On powerpc, the OpenFirmware devices are not matched without specifying
an of_match array. Introduce that array as that is used for matching
on the Freescale P1010 processor.
Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
Acked-by: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Acked-by: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
Cc: U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Cc: Grant Likely <grant.likely-s3s/WqlpOiPyB63q8FvJNQ@public.gmane.org>
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
Cc: devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org
---
drivers/net/can/flexcan.c | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 68cbe52..662f832 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -1027,8 +1027,19 @@ static int __devexit flexcan_remove(struct platform_device *pdev)
return 0;
}
+static struct of_device_id flexcan_of_match[] = {
+ {
+ .compatible = "fsl,flexcan",
+ },
+ {},
+};
+
static struct platform_driver flexcan_driver = {
- .driver.name = DRV_NAME,
+ .driver = {
+ .name = DRV_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = flexcan_of_match,
+ },
.probe = flexcan_probe,
.remove = __devexit_p(flexcan_remove),
};
--
1.7.2.1
^ permalink raw reply related
* [PATCH v11 1/5] flexcan: Remove #include <mach/clock.h>
From: Robin Holt @ 2011-08-10 16:27 UTC (permalink / raw)
To: Robin Holt, Kumar Gala, Wolfgang Grandegger, U Bhaskar-B22300
Cc: netdev-u79uwXL29TY76Z2rM5mHXA, U Bhaskar-B22300,
socketcan-core-0fE9KPoRgkgATYTw5x5z8w, Marc Kleine-Budde,
PPC list, Wolfgang Grandegger
In-Reply-To: <1312993670-23999-1-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
powerpc does not have a mach-####/clock.h. When testing, I found neither
arm nor powerpc needed the mach/clock.h at all so I removed it.
Signed-off-by: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
Acked-by: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Acked-by: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
Cc: U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org
Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org>
---
drivers/net/can/flexcan.c | 2 --
1 files changed, 0 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c
index 1767811..586b2cd 100644
--- a/drivers/net/can/flexcan.c
+++ b/drivers/net/can/flexcan.c
@@ -35,8 +35,6 @@
#include <linux/module.h>
#include <linux/platform_device.h>
-#include <mach/clock.h>
-
#define DRV_NAME "flexcan"
/* 8 for RX fifo and 2 error handling */
--
1.7.2.1
^ permalink raw reply related
* [PATCH v11 0/5] flexcan/powerpc: Add support for powerpc flexcan (freescale p1010)
From: Robin Holt @ 2011-08-10 16:27 UTC (permalink / raw)
To: Robin Holt, Kumar Gala, Wolfgang Grandegger, U Bhaskar-B22300
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w,
netdev-u79uwXL29TY76Z2rM5mHXA, PPC list, Marc Kleine-Budde
With all the patches applied, my p1010rdb works for communicating between
its two can ports and also can communicate with an external PSOC. I have
done no testing beyond compile testing on an arm system as I have no
access to an arm based system.
For the first three patches in the series, I believe they are all ready
for forwarding to David S. Miller for the netdev tree. I think patch
4 is ready for submission to the PPC85xx maintainer. Patch 5 changed
from the previous post by adding a second compatible string for the
fsl,flexcan-p1010 and bringing back the Documentation file in a more
correct form.
Thanks,
Robin Holt
^ permalink raw reply
* Re: [PATCH 5/5] [powerpc] Fix up fsl-flexcan device tree binding.
From: Robin Holt @ 2011-08-10 16:16 UTC (permalink / raw)
To: Kumar Gala
Cc: netdev-u79uwXL29TY76Z2rM5mHXA,
devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
U Bhaskar-B22300, socketcan-core-0fE9KPoRgkgATYTw5x5z8w,
Marc Kleine-Budde, Scott Wood, PPC list, Wolfgang Grandegger
In-Reply-To: <97251371-2772-42A5-A959-D9F7A8D0A65B-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
On Wed, Aug 10, 2011 at 09:52:07AM -0500, Kumar Gala wrote:
>
> On Aug 9, 2011, at 3:59 PM, Robin Holt wrote:
>
> > I guess my poor wording may have gotten me in trouble. I am getting
> > ready to repost this patch, but I want to ensure I am getting it as
> > right as possible.
> >
> > I think I should reword the commit message to indicate we are removing
> > the Documentation/.../fsl-flexcan.txt file which has essentially become
> > empty and change the p1010si.dtsi file's can nodes to "fsl,p1010-flexcan",
> > "fsl,flexcan". Is that correct?
> >
> > Thanks,
> > Robin
>
> This is wrong. Again, what binding covers "fsl,flexcan" if you remove fsl-flexcan.txt:
>
> [galak@right powerpc]$ git grep flexcan Documentation/devicetree/bindings
> Documentation/devicetree/bindings/net/can/fsl-flexcan.txt:fsl,flexcan-v1.0 nodes
> Documentation/devicetree/bindings/net/can/fsl-flexcan.txt:- fsl,flexcan-clock-source : CAN Engine Clock Source.This property selects
> Documentation/devicetree/bindings/net/can/fsl-flexcan.txt:- fsl,flexcan-clock-divider : for the reference and system clock, an additional
> Documentation/devicetree/bindings/net/can/fsl-flexcan.txt: - v1.0 of flexcan-v1.0 represent the IP block version for P1010 SOC.
> Documentation/devicetree/bindings/net/can/fsl-flexcan.txt: compatible = "fsl,flexcan-v1.0";
> Documentation/devicetree/bindings/net/can/fsl-flexcan.txt: fsl,flexcan-clock-source = "platform";
> Documentation/devicetree/bindings/net/can/fsl-flexcan.txt: fsl,flexcan-clock-divider = <2>;
>
> Not seeing anything that covers it.
>
> I think the issue should be resolved by patching fsl-flexcan.txt to remove wording or update it.
Done.
Robin
^ permalink raw reply
* [patch net-next-2.6 2/2] rtnetlink: remove initialization of dev->real_num_tx_queues
From: Jiri Pirko @ 2011-08-10 16:09 UTC (permalink / raw)
To: netdev; +Cc: davem, eric.dumazet, fubar, andy, tgraf, ebiederm
In-Reply-To: <1312992585-1201-1-git-send-email-jpirko@redhat.com>
dev->real_num_tx_queues is correctly set already in alloc_netdev_mqs.
Signed-off-by: Jiri Pirko <jpirko@redhat.com>
---
net/core/rtnetlink.c | 1 -
1 files changed, 0 insertions(+), 1 deletions(-)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 99d9e95..39f8dd6 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1604,7 +1604,6 @@ struct net_device *rtnl_create_link(struct net *src_net, struct net *net,
dev_net_set(dev, net);
dev->rtnl_link_ops = ops;
dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
- dev->real_num_tx_queues = real_num_queues;
if (tb[IFLA_MTU])
dev->mtu = nla_get_u32(tb[IFLA_MTU]);
--
1.7.6
^ permalink raw reply related
* [patch net-next-2.6 0/2] bonding: create same number of queues on all creations
From: Jiri Pirko @ 2011-08-10 16:09 UTC (permalink / raw)
To: netdev; +Cc: davem, eric.dumazet, fubar, andy, tgraf, ebiederm
When bonding device is created via /sys/class/net/bonding_masters,
correct number of queues is created. But if bonding device is created via rtnl,
default single queue is created. This little patchset makes it behaves the same.
Jiri Pirko (2):
bonding: implement get_tx_queues rtnk_link_op
rtnetlink: remove initialization of dev->real_num_tx_queues
drivers/net/bonding/bond_main.c | 9 +++++++++
net/core/rtnetlink.c | 1 -
2 files changed, 9 insertions(+), 1 deletions(-)
--
1.7.6
^ permalink raw reply
* [patch net-next-2.6 1/2] bonding: implement get_tx_queues rtnk_link_op
From: Jiri Pirko @ 2011-08-10 16:09 UTC (permalink / raw)
To: netdev; +Cc: davem, eric.dumazet, fubar, andy, tgraf, ebiederm
In-Reply-To: <1312992585-1201-1-git-send-email-jpirko@redhat.com>
If vonding device is created via rtnl, it is created with default number
of rx/tx queues. This patch implements callback in bonding so the
correct value (previously specified by bonding module param) is used.
Signed-off-by: Jiri Pirko <jpirko@redhat.com>
---
drivers/net/bonding/bond_main.c | 9 +++++++++
1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 38a83ac..854aa8d 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -4828,11 +4828,20 @@ static int bond_validate(struct nlattr *tb[], struct nlattr *data[])
return 0;
}
+static int bond_get_tx_queues(struct net *net, struct nlattr *tb[],
+ unsigned int *num_queues,
+ unsigned int *real_num_queues)
+{
+ *num_queues = tx_queues;
+ return 0;
+}
+
static struct rtnl_link_ops bond_link_ops __read_mostly = {
.kind = "bond",
.priv_size = sizeof(struct bonding),
.setup = bond_setup,
.validate = bond_validate,
+ .get_tx_queues = bond_get_tx_queues,
};
/* Create a new bond based on the specified name and bonding parameters.
--
1.7.6
^ permalink raw reply related
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