linux-kernel - Re: [PATCH 03/11] gpio: davinci: Modify to platform driver

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Date:	Thu, 13 Jun 2013 13:59:53 +0530
From:	Sekhar Nori <nsekhar@...com>
To:	"Philip, Avinash" <avinashphilip@...com>
CC:	"khilman@...prootsystems.com" <khilman@...prootsystems.com>,
	"linux@....linux.org.uk" <linux@....linux.org.uk>,
	"grant.likely@...retlab.ca" <grant.likely@...retlab.ca>,
	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/11] gpio: davinci: Modify to platform driver

On 6/13/2013 1:02 PM, Philip, Avinash wrote:

> With tnetv107x_defconfig build is failing
> 
> arch/arm/mach-davinci/board-tnetv107x-evm.c:282:15: error:
>  'davinci_timer_init' undeclared here (not in a function)
> arch/arm/mach-davinci/board-tnetv107x-evm.c:284:15: error:
>  'davinci_init_late' undeclared here (not in a function)
> make[1]: *** [arch/arm/mach-davinci/board-tnetv107x-evm.o] Error 1
> 
> Following patch fixes the build above breakage

The error you are seeing and the patch you provided below have no
correlation.

> 
> diff --git a/arch/arm/mach-davinci/board-tnetv107x-evm.c b/arch/arm/mach-davinci/board-tnetv107x-evm.c
> index ba79837..4a9c320 100644
> --- a/arch/arm/mach-davinci/board-tnetv107x-evm.c
> +++ b/arch/arm/mach-davinci/board-tnetv107x-evm.c
> @@ -30,6 +30,7 @@
>  #include <asm/mach/arch.h>
>  #include <asm/mach-types.h>
> 
> +#include <mach/common.h>
>  #include <mach/irqs.h>
>  #include <mach/edma.h>
>  #include <mach/mux.h>
> @@ -147,7 +148,7 @@ static struct davinci_nand_pdata nand_config = {
>         .ecc_bits       = 1,
>  };
> 
> -static struct davinci_uart_config serial_config __initconst = {
> +static struct davinci_uart_config serial_config = {
>         .enabled_uarts  = BIT(1),
>  };

You can make this __initdata instead - assuming its okay to have this
memory discarded at init.

> 
> @@ -245,7 +246,7 @@ static struct ti_ssp_data ssp_config = {
>         },
>  };
> 
> -static struct tnetv107x_device_info evm_device_info __initconst = {
> +static struct tnetv107x_device_info evm_device_info = {

Same here. You can make this __initdata.

Please send a formal patch for the errors you have seen.

>         .serial_config          = &serial_config,
>         .mmc_config[1]          = &mmc_config,  /* controller 1 */
>         .nand_config[0]         = &nand_config, /* chip select 0 */
> 
> 
> 
>>
>>>
>>> So I prefer to leave tnetv107x platform for now.
>>
>> I don't think that's acceptable. At least by me.
> 
> I think 2 options are available
> 1. Convert gpio-tnetv107x.c to platform driver. This will help in
> 	removing gpio references in davinci_soc_info structure.
> 2. Remove inline gpio api support and start use gpiolib support.
> 
> I prefer first option. It will help in removing
> <arch/arm/mach-davinci/include/mach/gpio-davinci.h>.

Okay. Can you take this up in this series? I understand you may not have
an tnetv107x board, but at least you can get to a series that builds.

Even if you choose to do just option #2, I am OK. What I really want to
see is inline API gone completely (not just remain largely unused). This
will also help you avoid exposing internal data structures like
davinci_gpio_controller exposed to the whole kernel. The worse part
right now is you have two copies of the same structure exposed globally
from two different include folders.

Thanks,
Sekhar
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