Subject: [PATCH v2 00/42] ARM: at91: move to common clk framework

From: [email-masked] (Richard Genoud)
Date: Fri, 26 Jul 2013 16:10:56 +0200

On 17/07/2013 15:34, Boris BREZILLON wrote:
> Hello,
> 
> This patch series is a proposal to move at91 clock implementation
> to common clk framework.
> 
> Most of the clock provided by the PMC (Power Management Controller) are
> implemented :
> - main clock (main oscillator)
> - pll clocks
> - master clock
> - programmable clocks
> - utmi clock
> - peripheral clocks
> - system clocks
> 
> This implementation is compatible with device tree: the goal is
> to define the whole clock tree in the device tree (all currently
> available dt SoCs and boards are patched to support dt clocks).
> Please feel free to comment the dt bindinds.
> 
> I removed the register_clocks function in SoC supporting dt boards only:
> - at91sam9x5 SoCs
> - at91sam9n12 SoC
> - sama5d3 SoCs
> 
> This patch series is based on linux-next and has been tested on sama5d31ek
> board using device tree. It compiles for other SoCs and both with and without
> dt support, but it has not been tested.
> 
> BTW could other people test it on other boards (I only have a kizbox and
> a sama5d31ek dev kit).
> 
> Best Regards,
> Boris
> 
> Changes since v1:
>  - fix bugs in pll, programmable and system clock implementations
>    (wrong bit position).
>  - add usb clock configuration support (ohci and udc drivers +
>    clk_lookup for non dt boards)
>  - rework of the system clock interfaces (no need to define a parent clock,
>    system clock is a gate with no rate info)
>  - change system, peripheral and programmable clk dt bindings (1 master node
>    and multiple child nodes each defining a system/peripheral or prog clock)
>  - fix bugs in sama5 dt definition
> 
Hi Boris,

First of all: Big thumbs up for this work !

Then, I tested the serie on at91sam9g35ek (sam9x5 familly), and I see some problems:
kernel is next-20130725 with the v4 serie of "ARM: at91: prepare transition to common clk framework"
and v2 serie of "ARM: at91: move to common clk framework"

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Linux version 3.11.0-rc2-next-20130725+ (rgenoud at lnx-rg) (gcc version 4.7.3 (Buildroot 2013.05-00157-g6d1e60b-dirty) ) #61 Fri Jul 26 15:30:13 CEST 2013
[    0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177
[    0.000000] CPU: VIVT data cache, VIVT instruction cache
[    0.000000] Machine: Atmel AT91SAM (Device Tree), model: Atmel AT91SAM9G35-EK
[    0.000000] bootconsole [earlycon0] enabled
[    0.000000] Memory policy: ECC disabled, Data cache writeback
[    0.000000] AT91: Detected soc type: at91sam9x5
[    0.000000] AT91: Detected soc subtype: at91sam9g35
[    0.000000] AT91: sram at 0x300000 of 0x8000 mapped at 0xfef70000
[    0.000000] On node 0 totalpages: 32768
[    0.000000] free_area_init_node: node 0, pgdat c039d208, node_mem_map c03b5000
[    0.000000]   Normal zone: 256 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 32768 pages, LIFO batch:7
[    0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[    0.000000] pcpu-alloc: [0] 0 
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 32512
[    0.000000] Kernel command line: console=ttyS0,115200 loglevel=8 ip=dhcp root=/dev/nfs nfsroot=10.128.0.9:/nfsroot,v3 rw earlyprintk
[    0.000000] PID hash table entries: 512 (order: -1, 2048 bytes)
[    0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes)
[    0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes)
[    0.000000] Memory: 126044K/131072K available (2804K kernel code, 126K rwdata, 592K rodata, 141K init, 93K bss, 5028K reserved)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
[    0.000000]     vmalloc : 0xc8800000 - 0xff000000   ( 872 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xc8000000   ( 128 MB)
[    0.000000]       .text : 0xc0008000 - 0xc0359550   (3398 kB)
[    0.000000]       .init : 0xc035a000 - 0xc037d61c   ( 142 kB)
[    0.000000]       .data : 0xc037e000 - 0xc039d920   ( 127 kB)
[    0.000000]        .bss : 0xc039d920 - 0xc03b4ff4   (  94 kB)
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] AT91: PIT: mck rate = 0
[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: CPU: 0 PID: 0 at arch/arm/mach-at91/at91sam926x_time.c:259 at91sam926x_pit_init+0x114/0x234()
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.11.0-rc2-next-20130725+ #61
[    0.000000] [<c000ca18>] (unwind_backtrace+0x0/0xe0) from [<c000b0f0>] (show_stack+0x10/0x14)
[    0.000000] [<c000b0f0>] (show_stack+0x10/0x14) from [<c00144e0>] (warn_slowpath_common+0x5c/0x7c)
[    0.000000] [<c00144e0>] (warn_slowpath_common+0x5c/0x7c) from [<c00145b8>] (warn_slowpath_null+0x18/0x1c)
[    0.000000] [<c00145b8>] (warn_slowpath_null+0x18/0x1c) from [<c03607b0>] (at91sam926x_pit_init+0x114/0x234)
[    0.000000] [<c03607b0>] (at91sam926x_pit_init+0x114/0x234) from [<c035ca4c>] (time_init+0x1c/0x24)
[    0.000000] [<c035ca4c>] (time_init+0x1c/0x24) from [<c035a650>] (start_kernel+0x19c/0x2f4)
[    0.000000] [<c035a650>] (start_kernel+0x19c/0x2f4) from [<20008040>] (0x20008040)
[    0.000000] ---[ end trace 1b75b31a2719ed1c ]---
[    0.000000] Division by zero in kernel.
[    0.000000] CPU: 0 PID: 0 Comm: swapper Tainted: G        W    3.11.0-rc2-next-20130725+ #61
[    0.000000] [<c000ca18>] (unwind_backtrace+0x0/0xe0) from [<c000b0f0>] (show_stack+0x10/0x14)
[    0.000000] [<c000b0f0>] (show_stack+0x10/0x14) from [<c013f0a0>] (Ldiv0_64+0x8/0x18)
[    0.000000] [<c013f0a0>] (Ldiv0_64+0x8/0x18) from [<c003b864>] (__clocksource_updatefreq_scale+0x30/0x104)
[    0.000000] [<c003b864>] (__clocksource_updatefreq_scale+0x30/0x104) from [<c003b944>] (__clocksource_register_scale+0xc/0x48)
[    0.000000] [<c003b944>] (__clocksource_register_scale+0xc/0x48) from [<c0360810>] (at91sam926x_pit_init+0x174/0x234)
[    0.000000] [<c0360810>] (at91sam926x_pit_init+0x174/0x234) from [<c035ca4c>] (time_init+0x1c/0x24)
[    0.000000] [<c035ca4c>] (time_init+0x1c/0x24) from [<c035a650>] (start_kernel+0x19c/0x2f4)
[    0.000000] [<c035a650>] (start_kernel+0x19c/0x2f4) from [<20008040>] (0x20008040)
[    0.000000] Division by zero in kernel.
[    0.000000] CPU: 0 PID: 0 Comm: swapper Tainted: G        W    3.11.0-rc2-next-20130725+ #61
[    0.000000] [<c000ca18>] (unwind_backtrace+0x0/0xe0) from [<c000b0f0>] (show_stack+0x10/0x14)
[    0.000000] [<c000b0f0>] (show_stack+0x10/0x14) from [<c013f0a0>] (Ldiv0_64+0x8/0x18)
[    0.000000] [<c013f0a0>] (Ldiv0_64+0x8/0x18) from [<c003b76c>] (clocks_calc_mult_shift+0x70/0xa4)
[    0.000000] [<c003b76c>] (clocks_calc_mult_shift+0x70/0xa4) from [<c003b8e4>] (__clocksource_updatefreq_scale+0xb0/0x104)
[    0.000000] [<c003b8e4>] (__clocksource_updatefreq_scale+0xb0/0x104) from [<c003b944>] (__clocksource_register_scale+0xc/0x48)
[    0.000000] [<c003b944>] (__clocksource_register_scale+0xc/0x48) from [<c0360810>] (at91sam926x_pit_init+0x174/0x234)
[    0.000000] [<c0360810>] (at91sam926x_pit_init+0x174/0x234) from [<c035ca4c>] (time_init+0x1c/0x24)
[    0.000000] [<c035ca4c>] (time_init+0x1c/0x24) from [<c035a650>] (start_kernel+0x19c/0x2f4)
[    0.000000] [<c035a650>] (start_kernel+0x19c/0x2f4) from [<20008040>] (0x20008040)
[...]

Best regards,
Richard