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Message-ID: <52552A72.7080704@atmel.com>
Date: Wed, 9 Oct 2013 12:05:38 +0200
From: Nicolas Ferre <nicolas.ferre@...el.com>
To: boris brezillon <b.brezillon@...rkiz.com>,
Grant Likely <grant.likely@...aro.org>,
Rob Herring <rob.herring@...xeda.com>,
Rob Landley <rob@...dley.net>,
Andrew Victor <linux@...im.org.za>,
"Jean-Christophe Plagniol-Villard" <plagnioj@...osoft.com>,
Russell King <linux@....linux.org.uk>,
Mike Turquette <mturquette@...aro.org>,
"Felipe Balbi" <balbi@...com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Ludovic Desroches <ludovic.desroches@...el.com>,
Josh Wu <josh.wu@...el.com>,
Richard Genoud <richard.genoud@...il.com>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 02/19] ARM: at91: add Kconfig options for common clk
support
On 09/10/2013 11:56, boris brezillon :
> On 07/10/2013 17:12, Nicolas Ferre wrote:
>> On 08/08/2013 07:02, Boris BREZILLON :
>>> This patch adds the following Kconfig options to prepare the
>>> transition to
>>> common clk framework:
>>>
>>> - AT91_USE_OLD_CLK: this option is selected by every SoC which does not
>>> support new at91 clks based on common clk framework (SoC which
>>> does not
>>> define the clock tree in its device tree).
>>> This options is also selected when the user choose non dt boards
>>> support
>>> (new at91 clks can only be registered from a device tree definition).
>>>
>>> - COMMON_CLK_AT91: this option cannot be selected directly. Instead
>>> it is
>>
>> I would have prefered to keep "AT91" as a prefix => "AT91_COMMON_CLK"
>> But it is not so important.
>>
> Now I remember why I choose this name.
> Take a look at drivers/clk/Makefile, the chip specific clks are defined
> this way:
>
> COMMON_CLK_XXX.
>
> Do you still want to rename it ?
Nope!
>
>>> enabled if these 3 conditions are met:
>>> * at least one of the selected SoCs have a PMC (Power Management
>>> Controller) Unit
>>> * device tree support is enabled
>>> * the old at91 clk implementation is disabled (every selected SoC
>>> define
>>> its clks in its device tree and non dt boards support is disabled)
>>>
>>> - OLD_CLK_AT91: this option cannot be selected directly. Instead it is
>>
>> Here also.
>>
>
> I can change this one.
No, let's stick to what you defined it will be fine.
>>> enabled if these 2 conditions are met:
>>> * at least one of the selected SoCs have a PMC (Power Management
>>> Controller) Unit
>>> * at least one of the selected SoCs does not define its clks in its
>>> device tree or non dt-boards support is enabled
>>>
>>> This patch selects AT91_USE_OLD_CLK in all currently supported SoCs.
>>> These
>>> selects will be removed after clk definitions are properly added in each
>>> soc's device tree.
>>> It also selects AT91_USE_OLD_CLK in all non-dt boards support.
>>>
>>> AT91_PMC_UNIT references are replaced by OLD_CLK_AT91, because PMC
>>> Unit is
>>> enabled for both old and common clk implementations, and old clk
>>> implementation should not be compiled if COMMON_CLK is enabled.
>>>
>>> To avoid future link errors, a new stub is created for
>>> at91_dt_clock_init
>>> function if OLD_CLK_AT91 is disabled.
>>>
>>> A new check is added in dt init functions (setup.c) to prepare for SoCs
>>> supporting new clk implementation. These SoCs won't setup the
>>> register_clocks callback (clk registration is done using of_clk_init).
>>>
>>> Signed-off-by: Boris BREZILLON <b.brezillon@...rkiz.com>
>>> ---
>>> arch/arm/mach-at91/Kconfig | 21 +++++++++++++++++++++
>>> arch/arm/mach-at91/Kconfig.non_dt | 6 ++++++
>>> arch/arm/mach-at91/Makefile | 2 +-
>>> arch/arm/mach-at91/generic.h | 3 ++-
>>> arch/arm/mach-at91/setup.c | 6 ++++--
>>> 5 files changed, 34 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/arch/arm/mach-at91/Kconfig b/arch/arm/mach-at91/Kconfig
>>> index 699b71e..85b53a4 100644
>>> --- a/arch/arm/mach-at91/Kconfig
>>> +++ b/arch/arm/mach-at91/Kconfig
>>> @@ -6,10 +6,22 @@ config HAVE_AT91_DBGU0
>>> config HAVE_AT91_DBGU1
>>> bool
>>>
>>> +config AT91_USE_OLD_CLK
>>> + bool
>>> +
>>> config AT91_PMC_UNIT
>>> bool
>>> default !ARCH_AT91X40
>>>
>>> +config COMMON_CLK_AT91
>>> + bool
>>> + default AT91_PMC_UNIT && USE_OF && !AT91_USE_OLD_CLK
>>> + select COMMON_CLK
>>> +
>>> +config OLD_CLK_AT91
>>> + bool
>>> + default AT91_PMC_UNIT && AT91_USE_OLD_CLK
>>> +
>>> config AT91_SAM9_ALT_RESET
>>> bool
>>> default !ARCH_AT91X40
>>> @@ -65,6 +77,7 @@ config SOC_SAMA5D3
>>> select SOC_SAMA5
>>> select HAVE_FB_ATMEL
>>> select HAVE_AT91_DBGU1
>>> + select AT91_USE_OLD_CLK
>>> help
>>> Select this if you are using one of Atmel's SAMA5D3 family SoC.
>>> This support covers SAMA5D31, SAMA5D33, SAMA5D34, SAMA5D35.
>>> @@ -78,11 +91,13 @@ config SOC_AT91RM9200
>>> select HAVE_AT91_DBGU0
>>> select MULTI_IRQ_HANDLER
>>> select SPARSE_IRQ
>>> + select AT91_USE_OLD_CLK
>>>
>>> config SOC_AT91SAM9260
>>> bool "AT91SAM9260, AT91SAM9XE or AT91SAM9G20"
>>> select HAVE_AT91_DBGU0
>>> select SOC_AT91SAM9
>>> + select AT91_USE_OLD_CLK
>>> help
>>> Select this if you are using one of Atmel's AT91SAM9260,
>>> AT91SAM9XE
>>> or AT91SAM9G20 SoC.
>>> @@ -92,6 +107,7 @@ config SOC_AT91SAM9261
>>> select HAVE_AT91_DBGU0
>>> select HAVE_FB_ATMEL
>>> select SOC_AT91SAM9
>>> + select AT91_USE_OLD_CLK
>>> help
>>> Select this if you are using one of Atmel's AT91SAM9261 or
>>> AT91SAM9G10 SoC.
>>>
>>> @@ -100,18 +116,21 @@ config SOC_AT91SAM9263
>>> select HAVE_AT91_DBGU1
>>> select HAVE_FB_ATMEL
>>> select SOC_AT91SAM9
>>> + select AT91_USE_OLD_CLK
>>>
>>> config SOC_AT91SAM9RL
>>> bool "AT91SAM9RL"
>>> select HAVE_AT91_DBGU0
>>> select HAVE_FB_ATMEL
>>> select SOC_AT91SAM9
>>> + select AT91_USE_OLD_CLK
>>>
>>> config SOC_AT91SAM9G45
>>> bool "AT91SAM9G45 or AT91SAM9M10 families"
>>> select HAVE_AT91_DBGU1
>>> select HAVE_FB_ATMEL
>>> select SOC_AT91SAM9
>>> + select AT91_USE_OLD_CLK
>>> help
>>> Select this if you are using one of Atmel's AT91SAM9G45
>>> family SoC.
>>> This support covers AT91SAM9G45, AT91SAM9G46, AT91SAM9M10 and
>>> AT91SAM9M11.
>>> @@ -121,6 +140,7 @@ config SOC_AT91SAM9X5
>>> select HAVE_AT91_DBGU0
>>> select HAVE_FB_ATMEL
>>> select SOC_AT91SAM9
>>> + select AT91_USE_OLD_CLK
>>> help
>>> Select this if you are using one of Atmel's AT91SAM9x5 family
>>> SoC.
>>> This means that your SAM9 name finishes with a '5' (except if
>>> it is
>>> @@ -133,6 +153,7 @@ config SOC_AT91SAM9N12
>>> select HAVE_AT91_DBGU0
>>> select HAVE_FB_ATMEL
>>> select SOC_AT91SAM9
>>> + select AT91_USE_OLD_CLK
>>> help
>>> Select this if you are using Atmel's AT91SAM9N12 SoC.
>>>
>>> diff --git a/arch/arm/mach-at91/Kconfig.non_dt
>>> b/arch/arm/mach-at91/Kconfig.non_dt
>>> index ca900be..b736b57 100644
>>> --- a/arch/arm/mach-at91/Kconfig.non_dt
>>> +++ b/arch/arm/mach-at91/Kconfig.non_dt
>>> @@ -12,26 +12,32 @@ config ARCH_AT91_NONE
>>> config ARCH_AT91RM9200
>>> bool "AT91RM9200"
>>> select SOC_AT91RM9200
>>> + select AT91_USE_OLD_CLK
>>>
>>> config ARCH_AT91SAM9260
>>> bool "AT91SAM9260 or AT91SAM9XE or AT91SAM9G20"
>>> select SOC_AT91SAM9260
>>> + select AT91_USE_OLD_CLK
>>>
>>> config ARCH_AT91SAM9261
>>> bool "AT91SAM9261 or AT91SAM9G10"
>>> select SOC_AT91SAM9261
>>> + select AT91_USE_OLD_CLK
>>>
>>> config ARCH_AT91SAM9263
>>> bool "AT91SAM9263"
>>> select SOC_AT91SAM9263
>>> + select AT91_USE_OLD_CLK
>>>
>>> config ARCH_AT91SAM9RL
>>> bool "AT91SAM9RL"
>>> select SOC_AT91SAM9RL
>>> + select AT91_USE_OLD_CLK
>>>
>>> config ARCH_AT91SAM9G45
>>> bool "AT91SAM9G45"
>>> select SOC_AT91SAM9G45
>>> + select AT91_USE_OLD_CLK
>>>
>>> config ARCH_AT91X40
>>> bool "AT91x40"
>>> diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
>>> index 3b0a953..8539411 100644
>>> --- a/arch/arm/mach-at91/Makefile
>>> +++ b/arch/arm/mach-at91/Makefile
>>> @@ -7,7 +7,7 @@ obj-m :=
>>> obj-n :=
>>> obj- :=
>>>
>>> -obj-$(CONFIG_AT91_PMC_UNIT) += clock.o
>>> +obj-$(CONFIG_OLD_CLK_AT91) += clock.o
>>> obj-$(CONFIG_AT91_SAM9_ALT_RESET) += at91sam9_alt_reset.o
>>> obj-$(CONFIG_AT91_SAM9G45_RESET) += at91sam9g45_reset.o
>>> obj-$(CONFIG_AT91_SAM9_TIME) += at91sam926x_time.o
>>> diff --git a/arch/arm/mach-at91/generic.h b/arch/arm/mach-at91/generic.h
>>> index dc6e2f5..375c42e 100644
>>> --- a/arch/arm/mach-at91/generic.h
>>> +++ b/arch/arm/mach-at91/generic.h
>>> @@ -44,11 +44,12 @@ extern void at91sam926x_pit_init(void);
>>> extern void at91x40_timer_init(void);
>>>
>>> /* Clocks */
>>> -#ifdef CONFIG_AT91_PMC_UNIT
>>> +#ifdef CONFIG_OLD_CLK_AT91
>>> extern int __init at91_clock_init(unsigned long main_clock);
>>> extern int __init at91_dt_clock_init(void);
>>> #else
>>> static int inline at91_clock_init(unsigned long main_clock) {
>>> return 0; }
>>> +static int inline at91_dt_clock_init(void) { return 0; }
>>> #endif
>>> struct device;
>>>
>>> diff --git a/arch/arm/mach-at91/setup.c b/arch/arm/mach-at91/setup.c
>>> index 41aa68b..06052fc 100644
>>> --- a/arch/arm/mach-at91/setup.c
>>> +++ b/arch/arm/mach-at91/setup.c
>>> @@ -483,7 +483,8 @@ void __init at91rm9200_dt_initialize(void)
>>> at91_dt_clock_init();
>>>
>>> /* Register the processor-specific clocks */
>>> - at91_boot_soc.register_clocks();
>>> + if (at91_boot_soc.register_clocks)
>>> + at91_boot_soc.register_clocks();
>>>
>>> at91_boot_soc.init();
>>> }
>>> @@ -498,7 +499,8 @@ void __init at91_dt_initialize(void)
>>> at91_dt_clock_init();
>>>
>>> /* Register the processor-specific clocks */
>>> - at91_boot_soc.register_clocks();
>>> + if (at91_boot_soc.register_clocks)
>>> + at91_boot_soc.register_clocks();
>>>
>>> if (at91_boot_soc.init)
>>> at91_boot_soc.init();
>>>
>>
>>
>
>
>
--
Nicolas Ferre
--
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