From: Robin Holt <holt@sgi.com>
To: Grant Likely <grant.likely@secretlab.ca>,
Marc Kleine-Budde <mkl@pengutronix.de>
Cc: Robin Holt <holt@sgi.com>, Kumar Gala <galak@kernel.crashing.org>,
Wolfgang Grandegger <wg@grandegger.com>,
U Bhaskar-B22300 <B22300@freescale.com>,
Scott Wood <scottwood@freescale.com>,
socketcan-core@lists.berlios.de, netdev@vger.kernel.org,
PPC list <linuxppc-dev@lists.ozlabs.org>,
devicetree-discuss@lists.ozlabs.org
Subject: Re: [PATCH v12 3/6] flexcan: Fix up fsl-flexcan device tree binding.
Date: Mon, 15 Aug 2011 10:03:57 -0500 [thread overview]
Message-ID: <20110815150357.GM4926@sgi.com> (raw)
In-Reply-To: <1313138752-24006-4-git-send-email-holt@sgi.com>
Grant,
Earlier, you had asked for a more specific name for the compatible
property of the Freescale flexcan device. I still have not gotten a
more specific answer. Hopefully Marc can give you more details about
the flexcan implementations.
Other than an agreement on the compatible property, I believe we have
agreement on all the other code changes in these patches. Is this change
acceptable as is and if we get a better resolution on the fsl,flexcan
name later, we can update the documentation and driver then?
Thanks,
Robin
On Fri, Aug 12, 2011 at 03:45:49AM -0500, Robin Holt wrote:
> 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 used by the driver so we are removing them.
>
> Signed-off-by: Robin Holt <holt@sgi.com>
> Acked-by: 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>
> To: Grant Likely <grant.likely@secretlab.ca>
> To: Kumar Gala <galak@kernel.crashing.org>
> Cc: socketcan-core@lists.berlios.de,
> Cc: netdev@vger.kernel.org,
> Cc: PPC list <linuxppc-dev@lists.ozlabs.org>
> Cc: devicetree-discuss@lists.ozlabs.org
> ---
> .../devicetree/bindings/net/can/fsl-flexcan.txt | 61 ++++----------------
> arch/powerpc/boot/dts/p1010rdb.dts | 10 +---
> arch/powerpc/boot/dts/p1010si.dtsi | 10 +--
> 3 files changed, 17 insertions(+), 64 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> index 1a729f0..80a78a9 100644
> --- a/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> +++ b/Documentation/devicetree/bindings/net/can/fsl-flexcan.txt
> @@ -1,61 +1,22 @@
> -CAN Device Tree Bindings
> -------------------------
> -2011 Freescale Semiconductor, Inc.
> +Flexcan CAN contoller on Freescale's ARM and PowerPC system-on-a-chip (SOC).
>
> -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,<processor>-flexcan" and "fsl,flexcan"
>
> -Can Engine Clock Source
> - There are two sources for CAN clock
> - - Platform Clock It represents the bus clock
> - - Oscillator Clock
> + An implementation should also claim any of the following compatibles
> + that it is fully backwards compatible with:
>
> - Peripheral Clock (PLL)
> - --------------
> - |
> - --------- -------------
> - | |CPI Clock | Prescaler | Sclock
> - | |---------------->| (1.. 256) |------------>
> - --------- -------------
> - | |
> - -------------- ---------------------CLK_SRC
> - Oscillator Clock
> + - fsl,p1010-flexcan
>
> -- 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).
> +- reg : Offset and length of the register set for this device
> +- interrupts : Interrupt tuple for this device
>
> -- 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.
> +Example:
>
> -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";
> + can@1c000 {
> + compatible = "fsl,p1010-flexcan", "fsl,flexcan";
> 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>;
> };
> 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
next prev parent reply other threads:[~2011-08-15 15:04 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-12 8:45 [PATCH v12 0/6] flexcan/powerpc: Add support for powerpc flexcan (freescale p1010) Robin Holt
2011-08-12 8:45 ` [PATCH v12 1/6] flexcan: Remove #include <mach/clock.h> Robin Holt
2011-08-12 8:45 ` [PATCH v12 2/6] flexcan: Abstract off read/write for big/little endian Robin Holt
2011-08-12 8:45 ` [PATCH v12 3/6] flexcan: Fix up fsl-flexcan device tree binding Robin Holt
2011-08-15 15:03 ` Robin Holt [this message]
[not found] ` <20110815150357.GM4926-sJ/iWh9BUns@public.gmane.org>
2011-08-15 15:13 ` Grant Likely
[not found] ` <CACxGe6vafc6mYyKCAO+HqkRPsZ3GmeVJnK+z8=BX_wQQMG4LmQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-08-15 15:25 ` Robin Holt
2011-08-15 16:13 ` Marc Kleine-Budde
2011-08-12 8:45 ` [PATCH v12 4/6] flexcan: Add of_match to platform_device definition Robin Holt
2011-08-12 8:45 ` [PATCH v12 5/6] flexcan: Prefer device tree clock frequency if available Robin Holt
[not found] ` <1313138752-24006-6-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
2011-08-12 12:22 ` Wolfgang Grandegger
2011-08-12 8:45 ` [PATCH v12 6/6] powerpc: Add flexcan device support for p1010rdb Robin Holt
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