Re: [RFC PATCHv2 arm: initial TI-Nspire support]

[Daniel Tang <dt.tangr@gmail.com>]

On 11/04/2013, at 10:30 PM, Arnd Bergmann <arnd@arndb.de> wrote:

> On Thursday 11 April 2013, Daniel Tang wrote:
>> This is another updated patch for Linux on TI-Nspire support. 
>> 
>> Apologies for previously posting updated patches as replies to the first thread. I'll send updated patches in new threads from now to avoid confusion.
>> 
>> Changes between http://archive.arm.linux.org.uk/lurker/message/20130408.113343.585af217.en.html and v2:
>> * Added new drivers to support the irqchip and timers on older models.
>> * Added new device trees to support the other models.
>> 
>> Signed-off-by: Daniel Tang <dt.tangr@gmail.com>
> 
> Nice!
> 
>> arch/arm/Kconfig                            |   2 +
>> arch/arm/Kconfig.debug                      |  16 ++
>> arch/arm/Makefile                           |   1 +
>> arch/arm/boot/dts/Makefile                  |   3 +
>> arch/arm/boot/dts/nspire-classic.dtsi       |  68 ++++++
>> arch/arm/boot/dts/nspire-clp.dts            |  45 ++++
>> arch/arm/boot/dts/nspire-cx.dts             | 115 ++++++++++
>> arch/arm/boot/dts/nspire-tp.dts             |  44 ++++
>> arch/arm/boot/dts/nspire.dtsi               | 159 ++++++++++++++
>> arch/arm/include/debug/nspire.S             |  28 +++
>> arch/arm/mach-nspire/Kconfig                |  15 ++
>> arch/arm/mach-nspire/Makefile               |   2 +
>> arch/arm/mach-nspire/Makefile.boot          |   0
>> arch/arm/mach-nspire/clcd.c                 | 118 +++++++++++
>> arch/arm/mach-nspire/clcd.h                 |  14 ++
>> arch/arm/mach-nspire/mmio.h                 |  15 ++
>> arch/arm/mach-nspire/nspire.c               | 142 +++++++++++++
>> drivers/clocksource/Makefile                |   1 +
>> drivers/clocksource/nspire-classic-timer.c  | 216 +++++++++++++++++++
>> drivers/input/keyboard/Kconfig              |  10 +
>> drivers/input/keyboard/Makefile             |   1 +
>> drivers/input/keyboard/nspire-keypad.c      | 316 ++++++++++++++++++++++++++++
>> drivers/irqchip/Makefile                    |   1 +
>> drivers/irqchip/irq-nspire-classic.c        | 177 ++++++++++++++++
>> include/clocksource/nspire_classic_timer.h  |  16 ++
>> include/linux/platform_data/nspire-keypad.h |  28 +++
>> 26 files changed, 1553 insertions(+)
> 
> Please split this up into a series of patches, one for each subsystem.
> I would also keep the dts files in a separate patch from the platform
> code.

Fair enough. I'll keep that in mind for the next round of patches.

> 
> 
>> +bool timer_init;
>> +
>> +void __init nspire_classic_timer_init(void)
>> +{
>> +	struct device_node *node;
>> +
>> +	if (timer_init)
>> +		return;
>> +
>> +	for_each_compatible_node(node, NULL, DT_COMPAT) {
>> +		nspire_timer_add(node);
>> +	}
>> +
>> +	timer_init = 1;
>> +}
>> +
>> +CLOCKSOURCE_OF_DECLARE(nspire_classic_timer,
>> +		DT_COMPAT, nspire_classic_timer_init)
> 
> Why do you need the logic to prevent it from being initilized
> twice?  Can't you just remove the direct call to nspire_classic_timer_init
> from platform code and rely on of_clk_init() to call it?
> 

Ah, I wasn't aware that of_clk_init() would call the init functions. I thought it was up to clocksource_of_init() to do that.

Originally, I was adding a call to clocksource_of_init() to the platform code but that resulted in the timers being added twice. If of_clk_init() already calls the init functions, that would explain it. 

> Note that the interface has changed in linux-next, you now
> get called separately for each matching device, with the device_node
> as the argument, so you no longer have to search the device tree,
> and can essentially do
> 
> CLOCKSOURCE_OF_DECLARE(nspire_classic_timer, DT_COMPAT, nspire_timer_add);
> 
> Feel free to rebase your patch on top of the clksrc/cleanup branch
> in arm-soc to get the new behavior.

That's perfect. That'll also let me kick the whole timer_init boolean thing.

> 
>> diff --git a/include/linux/platform_data/nspire-keypad.h b/include/linux/platform_data/nspire-keypad.h
>> new file mode 100644
>> index 0000000..03deb64
>> --- /dev/null
>> +++ b/include/linux/platform_data/nspire-keypad.h
> 
> And this file now also isn't needed any more, you can just merge the
> fields of struct nspire_keypad_data into struct nspire_keypad.
> 
> 	Arnd

Thanks again,
tangrs