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mpc8[56]xx: Put localbus clock in device tree 

Export the localbus frequency in the device tree, the same way the CPU, TB,
CCB, and various other frequencies are exported in their respective device
tree nodes.

Some localbus devices need this information to be programed correctly, so
it makes sense to export it along with the other frequencies.

Unfortunately, when someone wrote the localbus dts bindings, they didn't
bother to define what the "compatible" property should be.  So it seems no
one was quite sure what to put in their dts files.

Based on current existing dts files in the kernel source, I've used
"fsl,pq3-localbus" and "fsl,elbc" for MPC85xx, which are used by almost all
of the 85xx devices, and are looked for by the Linux code.  The eLBC is
apparently not entirely backward compatible with the pq3 LBC and so eLBC
equipped platforms like 8572 won't use pq3-localbus.

For MPC86xx, I've used "fsl,elbc" which is used by some of the 86xx systems
and is also looked for by the Linux code.  On MPC8641, I've also used
"fsl,mpc8641-localbus" as it is also commonly used in dts files, some of
which don't use "fsl,elbc" or any other acceptable name to match on.

Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Acked-by: Jon Loeliger <jdl@freescale.com>
This commit is contained in:
Trent Piepho 2008-12-03 15:16:38 -08:00 committed by Andrew Fleming-AFLEMING
parent 9d94aff699
commit 58ec4866ed
2 changed files with 16 additions and 1 deletions
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8
cpu/mpc85xx/fdt.c
View File

@ -28,11 +28,12 @@
#include <fdt_support.h>
#include <asm/processor.h>
DECLARE_GLOBAL_DATA_PTR;
extern void ft_qe_setup(void *blob);
#ifdef CONFIG_MP
#include "mp.h"
DECLARE_GLOBAL_DATA_PTR;
void ft_fixup_cpu(void *blob, u64 memory_limit)
{
@ -231,6 +232,11 @@ void ft_cpu_setup(void *blob, bd_t *bd)
"clock-frequency", bd->bi_intfreq, 1);
do_fixup_by_prop_u32(blob, "device_type", "soc", 4,
"bus-frequency", bd->bi_busfreq, 1);
do_fixup_by_compat_u32(blob, "fsl,pq3-localbus",
"bus-frequency", gd->lbc_clk, 1);
do_fixup_by_compat_u32(blob, "fsl,elbc",
"bus-frequency", gd->lbc_clk, 1);
#ifdef CONFIG_QE
ft_qe_setup(blob);
#endif

9
cpu/mpc86xx/fdt.c
View File

@ -13,6 +13,8 @@
DECLARE_GLOBAL_DATA_PTR;
DECLARE_GLOBAL_DATA_PTR;
void ft_cpu_setup(void *blob, bd_t *bd)
{
#if (CONFIG_NUM_CPUS > 1)
@ -29,6 +31,13 @@ void ft_cpu_setup(void *blob, bd_t *bd)
do_fixup_by_prop_u32(blob, "device_type", "soc", 4,
"bus-frequency", bd->bi_busfreq, 1);
#if defined(CONFIG_MPC8641)
do_fixup_by_compat_u32(blob, "fsl,mpc8641-localbus",
"bus-frequency", gd->lbc_clk, 1);
#endif
do_fixup_by_compat_u32(blob, "fsl,elbc",
"bus-frequency", gd->lbc_clk, 1);
fdt_fixup_memory(blob, (u64)bd->bi_memstart, (u64)bd->bi_memsize);
#if defined(CONFIG_HAS_ETH0) || defined(CONFIG_HAS_ETH1) \