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Date: Wed, 18 Dec 2013 13:58:44 +0100
From: Jonas Jensen <jonas.jensen@...il.com>
To: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
arm@...nel.org, linux@....linux.org.uk, arnd@...db.de,
olof@...om.net, soren.brinkmann@...inx.com,
peter.crosthwaite@...inx.com, linux@...ck-us.net,
Jonas Jensen <jonas.jensen@...il.com>
Subject: [PATCH v6 0/2] ARM: mach-moxart: add MOXA ART SoC support
Thanks for the replies!
This should tick the boxes on feedback except for one detail
on the fixed rate clock:
Moving fixed-clock "ref12" from .dtsi to .dts proved problematic
for other clocks, this is why ref12 is still in SoC.
My assertion is that "fixed-clock" clocks are probed later when
placed in .dts (see diff and boot log below).
of_clk_get() from clk_pll in .dtsi fails, i.e. fixed-clock ref12
is not added as a provider in time before clk_pll loads.
diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c
index 1ed591a..89dc8ca 100644
--- a/drivers/clk/clk-fixed-rate.c
+++ b/drivers/clk/clk-fixed-rate.c
@@ -98,8 +98,10 @@ void of_fixed_clk_setup(struct device_node *node)
of_property_read_string(node, "clock-output-names", &clk_name);
clk = clk_register_fixed_rate(NULL, clk_name, NULL, CLK_IS_ROOT, rate);
- if (!IS_ERR(clk))
+ if (!IS_ERR(clk)) {
+ pr_info("%s: of_clk_add_provider node=%p\n", __func__, node);
of_clk_add_provider(node, of_clk_src_simple_get, clk);
+ }
}
EXPORT_SYMBOL_GPL(of_fixed_clk_setup);
CLK_OF_DECLARE(fixed_clk, "fixed-clock", of_fixed_clk_setup);
diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
index 8312736..bd6c0c6 100644
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -2192,13 +2192,21 @@ struct clk *of_clk_get_from_provider(struct of_phandle_args *clkspec)
/* Check if we have such a provider in our array */
mutex_lock(&of_clk_lock);
list_for_each_entry(provider, &of_clk_providers, link) {
+ pr_info("%s: provider->node=%p clkspec->np=%p\n", __func__, provider->node, clkspec->np);
if (provider->node == clkspec->np)
clk = provider->get(clkspec, provider->data);
- if (!IS_ERR(clk))
+ if (!IS_ERR(clk)) {
break;
+ } else {
+ pr_info("%s: provider->get() failed\n", __func__);
+ }
}
mutex_unlock(&of_clk_lock);
+ if (IS_ERR(clk)) {
+ pr_info("%s: no providers\n", __func__);
+ }
+
return clk;
}
diff --git a/drivers/clk/clkdev.c b/drivers/clk/clkdev.c
index 442a313..57b2fc6 100644
--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -36,8 +36,10 @@ struct clk *of_clk_get(struct device_node *np, int index)
rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index,
&clkspec);
- if (rc)
+ if (rc) {
+ pr_info("%s: of_parse_phandle_with_args() failed\n", __func__);
return ERR_PTR(rc);
+ }
clk = of_clk_get_from_provider(&clkspec);
of_node_put(clkspec.np);
Uncompressing Linux... done, booting the kernel.
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 3.13.0-rc4-next-20131218+ (i@...jarn) (gcc version 4.6.3 (crosstool-NG 1.16.0) ) #1387 PREEMPT Wed Dec 18 12:20:50 CET 2013
[ 0.000000] CPU: FA526 [66015261] revision 1 (ARMv4), cr=0000397f
[ 0.000000] CPU: VIVT data cache, VIVT instruction cache
[ 0.000000] Machine model: MOXA UC-7112-LX
[ 0.000000] bootconsole [earlycon0] enabled
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 8128
[ 0.000000] Kernel command line: console=ttyS0,115200n8 earlyprintk root=/dev/mmcblk0p1 rw rootwait
[ 0.000000] PID hash table entries: 128 (order: -3, 512 bytes)
[ 0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.000000] Memory: 29616K/32768K available (2266K kernel code, 71K rwdata, 216K rodata, 103K init, 111K bss, 3152K reserved)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
[ 0.000000] fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
[ 0.000000] vmalloc : 0xc2800000 - 0xff000000 ( 968 MB)
[ 0.000000] lowmem : 0xc0000000 - 0xc2000000 ( 32 MB)
[ 0.000000] .text : 0xc0008000 - 0xc0274c44 (2484 kB)
[ 0.000000] .init : 0xc0275000 - 0xc028ed50 ( 104 kB)
[ 0.000000] .data : 0xc0290000 - 0xc02a1ee0 ( 72 kB)
[ 0.000000] .bss : 0xc02a1eec - 0xc02bdb64 ( 112 kB)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] Preemptible hierarchical RCU implementation.
[ 0.000000] NR_IRQS:16 nr_irqs:16 16
[ 0.000000] of_clk_get_from_provider: no providers
[ 0.000000] /soc/clk_pll@...00000: of_clk_get failed
[ 0.000000] of_clk_get_from_provider: no providers
[ 0.000000] /soc/clk_apb@...00000: of_clk_get failed
[ 0.000000] of_fixed_clk_setup: of_clk_add_provider node=c02ff5bc
[ 0.000000] of_clk_get_from_provider: provider->node=c02ff5bc clkspec->np=c02fe7dc
[ 0.000000] of_clk_get_from_provider: provider->get() failed
[ 0.000000] of_clk_get_from_provider: no providers
[ 0.000000] Kernel panic - not syncing: /soc/timer@...00000: of_clk_get failed
Changes since v5:
1. change Makefile objects list order, sort alphabetically
2. add "clocks = <&ref12>" to clk_pll node in board file,
remove it from SoC
3. move PHY nodes from SoC to board
Applies to next-20131218
Jonas Jensen (2):
ARM: mach-moxart: add MOXA ART SoC platform files
ARM: mach-moxart: add MOXA ART SoC device tree files
Documentation/devicetree/bindings/arm/moxart.txt | 12 ++
arch/arm/Kconfig | 2 +
arch/arm/Makefile | 1 +
arch/arm/boot/dts/Makefile | 1 +
arch/arm/boot/dts/moxart-uc7112lx.dts | 109 ++++++++++++++++
arch/arm/boot/dts/moxart.dtsi | 154 +++++++++++++++++++++++
arch/arm/configs/moxart_defconfig | 149 ++++++++++++++++++++++
arch/arm/mach-moxart/Kconfig | 31 +++++
arch/arm/mach-moxart/Makefile | 3 +
arch/arm/mach-moxart/moxart.c | 15 +++
10 files changed, 477 insertions(+)
create mode 100644 Documentation/devicetree/bindings/arm/moxart.txt
create mode 100644 arch/arm/boot/dts/moxart-uc7112lx.dts
create mode 100644 arch/arm/boot/dts/moxart.dtsi
create mode 100644 arch/arm/configs/moxart_defconfig
create mode 100644 arch/arm/mach-moxart/Kconfig
create mode 100644 arch/arm/mach-moxart/Makefile
create mode 100644 arch/arm/mach-moxart/moxart.c
--
1.8.2.1
--
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