netdev - Re: [RFC 4/4] [powerpc] Implement a p1010rdb clock source.

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Message-ID: <4E3D4875.30707@pengutronix.de>
Date:	Sat, 06 Aug 2011 15:58:13 +0200
From:	Marc Kleine-Budde <mkl@...gutronix.de>
To:	Robin Holt <holt@....com>
CC:	Wolfgang Grandegger <wg@...ndegger.com>,
	U Bhaskar-B22300 <B22300@...escale.com>,
	socketcan-core@...ts.berlios.de, netdev@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC 4/4] [powerpc] Implement a p1010rdb clock source.

On 08/06/2011 06:05 AM, Robin Holt wrote:
> flexcan driver needs the clk_get, clk_get_rate, etc functions
> to work.  This patch provides the minimum functionality.

This patch has to go via the powerpc git tree. Added
linuxppc-dev@...ts.ozlabs.org on CC.

> Signed-off-by: Robin Holt <holt@....com>
> To: Marc Kleine-Budde <mkl@...gutronix.de>
> To: Wolfgang Grandegger <wg@...ndegger.com>
> To: U Bhaskar-B22300 <B22300@...escale.com>
> Cc: socketcan-core@...ts.berlios.de
> Cc: netdev@...r.kernel.org
> ---
>  arch/powerpc/platforms/85xx/p1010rdb.c |   78 ++++++++++++++++++++++++++++++++
>  1 files changed, 78 insertions(+), 0 deletions(-)
> 
> diff --git a/arch/powerpc/platforms/85xx/p1010rdb.c b/arch/powerpc/platforms/85xx/p1010rdb.c
> index 3540a88..8f78ddd 100644
> --- a/arch/powerpc/platforms/85xx/p1010rdb.c
> +++ b/arch/powerpc/platforms/85xx/p1010rdb.c
> @@ -28,6 +28,7 @@
>  #include <asm/udbg.h>
>  #include <asm/mpic.h>
>  #include <asm/swiotlb.h>
> +#include <asm/clk_interface.h>
>  
>  #include <sysdev/fsl_soc.h>
>  #include <sysdev/fsl_pci.h>
> @@ -164,6 +165,82 @@ static void __init p1010_rdb_setup_arch(void)
>  	printk(KERN_INFO "P1010 RDB board from Freescale Semiconductor\n");
>  }
>  
> +/*
> + * p1010rdb needs to provide a clock source for the flexcan driver.
> + */
> +struct clk {
> +	unsigned long rate;
> +} p1010rdb_system_clk;
> +
> +static struct clk *p1010_rdb_clk_get(struct device *dev, const char *id)
> +{
> +	struct clk *clk;
> +	u32 *of_property;
> +	unsigned long clock_freq, clock_divider;
> +	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);
> +
> +	of_property = (u32 *)of_get_property(dev->of_node, "clock_freq", NULL);
> +	if (!of_property)
> +		return ERR_PTR(-ENOENT);
> +	clock_freq = *of_property;
> +
> +	of_property = (u32 *)of_get_property(dev->of_node,
> +					     "fsl,flexcan-clock-divider", NULL);
> +	if (!of_property)
> +		return ERR_PTR(-ENOENT);
> +	clock_divider = *of_property;
> +
> +	clk = kmalloc(sizeof(struct clk), GFP_KERNEL);
> +	if (!clk)
> +		return ERR_PTR(-ENOMEM);
> +
> +	clk->rate = DIV_ROUND_CLOSEST(clock_freq / clock_divider, 1000);
> +	clk->rate *= 1000;
> +
> +	return clk;
> +}
> +
> +static void p1010_rdb_clk_put(struct clk *clk)
> +{
> +	kfree(clk);
> +}
> +
> +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,
> +};
> +
> +static void __init p1010_rdb_clk_init(void)
> +{
> +	clk_functions = p1010_rdb_clk_functions;
> +}
> +
> +static void __init p1010_rdb_init(void)
> +{
> +	p1010_rdb_clk_init();
> +}
> +
>  static struct of_device_id __initdata p1010rdb_ids[] = {
>  	{ .type = "soc", },
>  	{ .compatible = "soc", },
> @@ -195,6 +272,7 @@ 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,

Marc

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