Re: [RFC 4/4] [powerpc] Add flexcan device support for p1010rdb.

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 08/09/2011 07:55 AM, Robin Holt wrote:
> I added a clock source for the p1010rdb so the flexcan driver
> could find its clock frequency.
> 
> 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>
> Cc: socketcan-core@lists.berlios.de,
> Cc: netdev@vger.kernel.org,
> Cc: PPC list <linuxppc-dev@lists.ozlabs.org>

After fixing Wolfgangs remarks add by Acked-by, for what it's worth in
the ppc-world :)

Some nitpicking from me :) - Darn you send another patch. This comments
still apply.

> 
> ---
> 
> Could I also get a ruling on the Kconfig language.  I could do it either
> with the 85xx_HAVE_CAN_FLEXCAN in or out of the Kconfig file.  It felt
> like the right thing to do was without, but the arm Kconfig files do
> it this way and a patch from freescale had something similar so I went
> this route.
> 
>  arch/powerpc/platforms/85xx/Kconfig    |    6 +++
>  arch/powerpc/platforms/85xx/Makefile   |    1 +
>  arch/powerpc/platforms/85xx/clock.c    |   59 ++++++++++++++++++++++++++++++++
>  arch/powerpc/platforms/85xx/p1010rdb.c |    8 ++++
>  4 files changed, 74 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..ed4cf92 100644
> --- a/arch/powerpc/platforms/85xx/Kconfig
> +++ b/arch/powerpc/platforms/85xx/Kconfig
> @@ -26,6 +26,10 @@ config MPC8560_ADS
>  	help
>  	  This option enables support for the MPC 8560 ADS board
>  
> +config 85xx_HAVE_CAN_FLEXCAN
> +	bool
> +	select HAVE_CAN_FLEXCAN if NET && CAN
> +
>  config MPC85xx_CDS
>  	bool "Freescale MPC85xx CDS"
>  	select DEFAULT_UIMAGE
> @@ -70,6 +74,8 @@ config MPC85xx_RDB
>  config P1010_RDB
>  	bool "Freescale P1010RDB"
>  	select DEFAULT_UIMAGE
> +	select 85xx_HAVE_CAN_FLEXCAN
> +	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..64ad7a4 100644
> --- a/arch/powerpc/platforms/85xx/Makefile
> +++ b/arch/powerpc/platforms/85xx/Makefile
> @@ -11,6 +11,7 @@ obj-$(CONFIG_MPC85xx_DS)  += mpc85xx_ds.o
>  obj-$(CONFIG_MPC85xx_MDS) += mpc85xx_mds.o
>  obj-$(CONFIG_MPC85xx_RDB) += mpc85xx_rdb.o
>  obj-$(CONFIG_P1010_RDB)   += p1010rdb.o
> +obj-$(CONFIG_PPC_CLOCK)   += clock.o
>  obj-$(CONFIG_P1022_DS)    += p1022_ds.o
>  obj-$(CONFIG_P1023_RDS)   += p1023_rds.o
>  obj-$(CONFIG_P2040_RDB)   += p2040_rdb.o corenet_ds.o
> diff --git a/arch/powerpc/platforms/85xx/clock.c b/arch/powerpc/platforms/85xx/clock.c
> new file mode 100644
> index 0000000..a25cbf3
> --- /dev/null
> +++ b/arch/powerpc/platforms/85xx/clock.c
> @@ -0,0 +1,59 @@

Please add your copyright notice and add a license, e.g. "This file is
released under GPLv2"

> +
> +#include <linux/device.h>
> +#include <linux/err.h>
> +
> +#include <asm/clk_interface.h>
> +
> +#include <sysdev/fsl_soc.h>
> +
> +/*
> + * p1010rdb needs to provide a clock source for the flexcan driver.
> + */
> +struct clk {
> +	unsigned long rate;
> +} p1010_rdb_system_clock;
> +
> +static struct clk *p1010_rdb_clk_get(struct device *dev, const char *id)
> +{
> +	const char *dev_init_name;
> +
> +	if (!dev)
> +		return ERR_PTR(-ENOENT);
> +
> +	/*
> +	 * The can devices are named ffe1c000.can0 and ffe1d000.can1 on
> +	 * the p1010rdb.  Check for the "can" portion of that name before
> +	 * returning a clock source.
> +	 */
> +	dev_init_name = dev_name(dev);
> +	if (strlen(dev_init_name) != 13)
> +		return ERR_PTR(-ENOENT);
> +	dev_init_name += 9;
> +	if (strncmp(dev_init_name, "can", 3))
> +		return ERR_PTR(-ENOENT);
> +
> +	return &p1010_rdb_system_clock;
> +}
> +
> +static void p1010_rdb_clk_put(struct clk *clk)
> +{
> +	return;
> +}
> +
> +static unsigned long p1010_rdb_clk_get_rate(struct clk *clk)
> +{
> +	return clk->rate;
> +}
> +
> +static struct clk_interface p1010_rdb_clk_functions = {
> +	.clk_get		= p1010_rdb_clk_get,
> +	.clk_get_rate		= p1010_rdb_clk_get_rate,
> +	.clk_put		= p1010_rdb_clk_put,

no indention here please, just one space before the "=". YMMV

> +};
> +
> +void __init p1010_rdb_clk_init(void)
> +{
> +	p1010_rdb_system_clock.rate = fsl_get_sys_freq();
> +	clk_functions = p1010_rdb_clk_functions;
> +}
> +
> diff --git a/arch/powerpc/platforms/85xx/p1010rdb.c b/arch/powerpc/platforms/85xx/p1010rdb.c
> index d7387fa..29e04d6 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");
>  }
>  
> +static void __init p1010_rdb_init(void)
> +{
> +#ifdef PPC_CLOCK
> +	p1010_rdb_clk_init();
> +#endif
> +}
> +
>  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,

cheers, Marc

-- 
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