From: Wolfgang Grandegger <wg@grandegger•com>
To: Robin Holt <holt@sgi•com>
Cc: netdev@vger•kernel.org, U Bhaskar-B22300 <B22300@freescale•com>,
socketcan-core@lists•berlios.de,
Scott Wood <scottwood@freescale•com>,
PPC list <linuxppc-dev@lists•ozlabs.org>
Subject: Re: [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding.
Date: Wed, 10 Aug 2011 15:47:43 +0200 [thread overview]
Message-ID: <4E428BFF.7060402@grandegger.com> (raw)
In-Reply-To: <1312945564-6626-6-git-send-email-holt@sgi.com>
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.
> 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@sgi•com>
> To: Marc Kleine-Budde <mkl@pengutronix•de>,
> To: Wolfgang Grandegger <wg@grandegger•com>,
> To: U Bhaskar-B22300 <B22300@freescale•com>
> To: Scott Wood <scottwood@freescale•com>
> Cc: socketcan-core@lists•berlios.de,
> Cc: netdev@vger•kernel.org,
> Cc: PPC list <linuxppc-dev@lists•ozlabs.org>
> Cc: Kumar Gala <galak@kernel•crashing.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>;
};
-------------------------
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).
Wolfgang.
next prev parent reply other threads:[~2011-08-10 13:47 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-10 3:05 [PATCH v10 0/5] [flexcan/powerpc] Add support for powerpc flexcan (freescale p1010) Robin Holt
2011-08-10 3:06 ` [PATCH v10 1/5] [flexcan] Remove #include <mach/clock.h> Robin Holt
2011-08-10 3:06 ` [PATCH v10 2/5] [flexcan] Abstract off read/write for big/little endian Robin Holt
2011-08-10 3:06 ` [PATCH v10 3/5] [flexcan] Add of_match to platform_device definition Robin Holt
2011-08-10 14:33 ` Robin Holt
2011-08-10 3:06 ` [PATCH v10 4/5] [powerpc] Add flexcan device support for p1010rdb Robin Holt
2011-08-10 9:56 ` Marc Kleine-Budde
2011-08-10 10:15 ` Robin Holt
2011-08-10 3:06 ` [PATCH v10 5/5] [powerpc] Fix up fsl-flexcan device tree binding Robin Holt
2011-08-10 8:15 ` Robert Schwebel
2011-08-10 10:09 ` Robin Holt
2011-08-10 13:47 ` Wolfgang Grandegger [this message]
2011-08-10 14:15 ` Robin Holt
2011-08-10 14:36 ` U Bhaskar-B22300
2011-08-10 16:00 ` Robin Holt
2011-08-10 16:53 ` Kumar Gala
2011-08-10 17:16 ` Robin Holt
2011-08-10 17:17 ` Kumar Gala
2011-08-10 17:20 ` Robin Holt
2011-08-10 17:26 ` Kumar Gala
2011-08-10 18:23 ` Wolfgang Grandegger
2011-08-10 18:27 ` Scott Wood
2011-08-10 18:35 ` Robin Holt
2011-08-10 18:39 ` Scott Wood
2011-08-10 14:41 ` Wolfgang Grandegger
2011-08-10 14:46 ` Kumar Gala
2011-08-10 14:45 ` Kumar Gala
2011-08-10 15:35 ` Robin Holt
2011-08-10 10:01 ` [PATCH v10 0/5] [flexcan/powerpc] Add support for powerpc flexcan (freescale p1010) Marc Kleine-Budde
2011-08-10 10:11 ` Robin Holt
2011-08-10 10:24 ` Marc Kleine-Budde
2011-08-10 11:09 ` Marc Kleine-Budde
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