[U-Boot] [PATCH 09/12] microblaze: timer: Add device-tree driver configuration

[Michal Simek <monstr@monstr.eu>]

On 07/09/2012 11:32 PM, Simon Glass wrote:
> Hi Michal,
>
> On Mon, Jul 9, 2012 at 2:20 AM, Michal Simek <monstr at monstr.eu <mailto:monstr@monstr.eu>> wrote:
>
>     Read configuration from DTB.
>
>     Signed-off-by: Michal Simek <monstr at monstr.eu <mailto:monstr@monstr.eu>>
>     ---
>       arch/microblaze/cpu/timer.c |   25 +++++++++++++++++++++++++
>       1 files changed, 25 insertions(+), 0 deletions(-)
>
>     diff --git a/arch/microblaze/cpu/timer.c b/arch/microblaze/cpu/timer.c
>     index dfaaaf5..91ca42b 100644
>     --- a/arch/microblaze/cpu/timer.c
>     +++ b/arch/microblaze/cpu/timer.c
>     @@ -25,6 +25,9 @@
>       #include <common.h>
>       #include <asm/microblaze_timer.h>
>       #include <asm/microblaze_intc.h>
>     +#include <fdtdec.h>
>     +
>     +DECLARE_GLOBAL_DATA_PTR;
>
>       volatile int timestamp = 0;
>       microblaze_timer_t *tmr;
>     @@ -62,11 +65,33 @@ int timer_init (void)
>              u32 preload = 0;
>              u32 ret = 0;
>
>     +#ifndef CONFIG_OF_CONTROL
>
>
> Maybe make this #ifdef and put the fdt code first?

I see only one reason to do it (and that's why I have done it in intc code too)
which is debug purpose. Because you can simple comment ifdefs and hardcoded values
below fdt code which you can debug.



>
>       #if defined(CONFIG_SYS_TIMER_0_ADDR) && defined(CONFIG_SYS_INTC_0_NUM)
>              preload = XILINX_CLOCK_FREQ / CONFIG_SYS_HZ;
>              irq = CONFIG_SYS_TIMER_0_IRQ;
>              tmr = (microblaze_timer_t *) (CONFIG_SYS_TIMER_0_ADDR);
>       #endif
>     +#else
>     +       int temp;
>     +       int offset = 0;
>
>
> Can remove =0 I think.

done.

>
>     +
>     +       offset = fdt_node_offset_by_compatible(gd->fdt_blob, offset,
>     + "xlnx,xps-timer-1.00.a");
>     +       if (offset > 0) {
>     +               temp = fdtdec_get_addr(gd->fdt_blob, offset, "reg");
>     +               if (temp != FDT_ADDR_T_NONE) {
>     +                       tmr = (microblaze_timer_t *)temp;
>     +                       irq = fdtdec_get_int(gd->fdt_blob, offset,
>     + "interrupts", -1);
>     +                       if (irq == -1)
>     +                               panic("Connect IRQ to system timer\n");
>
>
> That's a little cryptic - maybe should mention fdt?

What about this?
panic("Timer IRQ is not found in DTS/DTB\n");

I don't want to write there novels but this is also checked in different tool
which generates DTS that's why simple panic should be eliminated for most cases.

Thanks,
Michal


-- 
Michal Simek, Ing. (M.Eng)
w: www.monstr.eu p: +42-0-721842854
Maintainer of Linux kernel 2.6 Microblaze Linux - http://www.monstr.eu/fdt/
Microblaze U-BOOT custodian