From: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public•gmane.org>
To: Robin Holt <holt-sJ/iWh9BUns@public•gmane.org>
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public•gmane.org,
U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public•gmane.org>,
Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public•gmane.org>,
PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public•gmane.org>,
netdev-u79uwXL29TY76Z2rM5mHXA@public•gmane.org
Subject: Re: [PATCH 4/4] [powerpc] Add flexcan device support for p1010rdb.
Date: Tue, 09 Aug 2011 15:00:12 +0200 [thread overview]
Message-ID: <4E412F5C.7030802@grandegger.com> (raw)
In-Reply-To: <1312892907-20419-5-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
Hi Robin,
On 08/09/2011 02:28 PM, Robin Holt wrote:
> I added a simple clock source for the p1010rdb so the flexcan driver
> could determine a clock frequency. The p1010 can device only has an
> oscillator of system bus frequency divided by 2.
>
> 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>
> Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public•gmane.org,
> Cc: netdev-u79uwXL29TY76Z2rM5mHXA@public•gmane.org,
> Cc: PPC list <linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public•gmane.org>
> ---
> arch/powerpc/platforms/85xx/Kconfig | 2 +
> arch/powerpc/platforms/85xx/Makefile | 2 +
> arch/powerpc/platforms/85xx/clock.c | 42 ++++++++++++++++++++++++++++++++
> arch/powerpc/platforms/85xx/p1010rdb.c | 8 ++++++
> 4 files changed, 54 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..a6fd2c8
> --- /dev/null
> +++ b/arch/powerpc/platforms/85xx/clock.c
> @@ -0,0 +1,42 @@
> +
> +#include <linux/device.h>
> +#include <linux/err.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);
> +
Ah, I think you removed too much code here. I obviously did not
understand what the device node check is good for, sorry. The clock is
only implemented for the Flexcan and therefore we should add a check here:
if (!dev->of_node ||
!of_device_is_compatible(dev->of_node, "fsl,flexcan"))
return ERR_PTR(-ENOENT);
Something like that should work. For the next version you can then add
my "Acked-by: Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public•gmane.org" to all patches.
Wolfgang.
next prev parent reply other threads:[~2011-08-09 13:00 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-09 12:28 [Patch 0/4] [flexcan/powerpc] Add support for powerpc flexcan (freescale p1010) -V8 Robin Holt
2011-08-09 12:28 ` [PATCH 2/4] [flexcan] Abstract off read/write for big/little endian Robin Holt
[not found] ` <1312892907-20419-1-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
2011-08-09 12:28 ` [PATCH 1/4] [flexcan] Remove #include <mach/clock.h> Robin Holt
2011-08-09 12:28 ` [PATCH 3/4] [flexcan] Add of_match to platform_device definition Robin Holt
2011-08-09 12:28 ` [PATCH 4/4] [powerpc] Add flexcan device support for p1010rdb Robin Holt
[not found] ` <1312892907-20419-5-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
2011-08-09 13:00 ` Wolfgang Grandegger [this message]
2011-08-09 14:45 ` U Bhaskar-B22300
[not found] ` <9C64B7751C3BCA41B64A68E23005A7BE1C4A88-TcFNo7jSaXPiTqIcKZ1S2K4g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2011-08-09 14:55 ` Robin Holt
[not found] ` <20110809145507.GY4926-sJ/iWh9BUns@public.gmane.org>
2011-08-09 15:10 ` Wolfgang Grandegger
2011-08-09 15:11 ` Marc Kleine-Budde
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