linux-kernel - Re: [PATCH v2 02/17] ARM: at91: pm: move SAM9X60's PM under its own SoC config flag

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Message-ID: <10705ea9-7a0f-5af4-e383-293fabed6b89@microchip.com>
Date:   Wed, 27 Nov 2019 08:06:47 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <alexandre.belloni@...tlin.com>
CC:     <linux@...linux.org.uk>, <Nicolas.Ferre@...rochip.com>,
        <Ludovic.Desroches@...rochip.com>, <sre@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v2 02/17] ARM: at91: pm: move SAM9X60's PM under its own
 SoC config flag



On 26.11.2019 23:28, Alexandre Belloni wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> On 26/11/2019 15:12:06+0200, Claudiu Beznea wrote:
>> Move SAM9X60's PM part under SoC config flag. This allows the building
>> of SAM9X60 platform withouth depending on CONFIG_SOC_AT91SAM9 flag,
>> allowing us to select only necessary config flags for SAM9X60.
>>
> 
> I'm really wondering, how much space does that really save?
> 
> The net benefit seems to be very small...

Not that much, indeed. We want to be independent of SOC_AT91SAM9.

> 
>> Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
>> ---
>>  arch/arm/mach-at91/Makefile   |  1 +
>>  arch/arm/mach-at91/at91sam9.c | 18 ------------------
>>  arch/arm/mach-at91/pm.c       |  2 +-
>>  arch/arm/mach-at91/sam9x60.c  | 34 ++++++++++++++++++++++++++++++++++
>>  4 files changed, 36 insertions(+), 19 deletions(-)
>>  create mode 100644 arch/arm/mach-at91/sam9x60.c
>>
>> diff --git a/arch/arm/mach-at91/Makefile b/arch/arm/mach-at91/Makefile
>> index de64301dcff2..f565490f1b70 100644
>> --- a/arch/arm/mach-at91/Makefile
>> +++ b/arch/arm/mach-at91/Makefile
>> @@ -6,6 +6,7 @@
>>  # CPU-specific support
>>  obj-$(CONFIG_SOC_AT91RM9200) += at91rm9200.o
>>  obj-$(CONFIG_SOC_AT91SAM9)   += at91sam9.o
>> +obj-$(CONFIG_SOC_SAM9X60)    += sam9x60.o
>>  obj-$(CONFIG_SOC_SAMA5)              += sama5.o
>>  obj-$(CONFIG_SOC_SAMV7)              += samv7.o
>>
>> diff --git a/arch/arm/mach-at91/at91sam9.c b/arch/arm/mach-at91/at91sam9.c
>> index bf629c90c758..7e572189a5eb 100644
>> --- a/arch/arm/mach-at91/at91sam9.c
>> +++ b/arch/arm/mach-at91/at91sam9.c
>> @@ -31,21 +31,3 @@ DT_MACHINE_START(at91sam_dt, "Atmel AT91SAM9")
>>       .init_machine   = at91sam9_init,
>>       .dt_compat      = at91_dt_board_compat,
>>  MACHINE_END
>> -
>> -static void __init sam9x60_init(void)
>> -{
>> -     of_platform_default_populate(NULL, NULL, NULL);
>> -
>> -     sam9x60_pm_init();
>> -}
>> -
>> -static const char *const sam9x60_dt_board_compat[] __initconst = {
>> -     "microchip,sam9x60",
>> -     NULL
>> -};
>> -
>> -DT_MACHINE_START(sam9x60_dt, "Microchip SAM9X60")
>> -     /* Maintainer: Microchip */
>> -     .init_machine   = sam9x60_init,
>> -     .dt_compat      = sam9x60_dt_board_compat,
>> -MACHINE_END
>> diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
>> index d5af6aedc02c..56a6a49b19e2 100644
>> --- a/arch/arm/mach-at91/pm.c
>> +++ b/arch/arm/mach-at91/pm.c
>> @@ -805,7 +805,7 @@ void __init at91rm9200_pm_init(void)
>>
>>  void __init sam9x60_pm_init(void)
>>  {
>> -     if (!IS_ENABLED(CONFIG_SOC_AT91SAM9))
>> +     if (!IS_ENABLED(CONFIG_SOC_SAM9X60))
>>               return;
>>
>>       at91_pm_modes_init();
>> diff --git a/arch/arm/mach-at91/sam9x60.c b/arch/arm/mach-at91/sam9x60.c
>> new file mode 100644
>> index 000000000000..d8c739d25458
>> --- /dev/null
>> +++ b/arch/arm/mach-at91/sam9x60.c
>> @@ -0,0 +1,34 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * Setup code for SAM9X60.
>> + *
>> + * Copyright (C) 2019 Microchip Technology Inc. and its subsidiaries
>> + *
>> + * Author: Claudiu Beznea <claudiu.beznea@...rochip.com>
>> + */
>> +
>> +#include <linux/of.h>
>> +#include <linux/of_platform.h>
>> +
>> +#include <asm/mach/arch.h>
>> +#include <asm/system_misc.h>
>> +
>> +#include "generic.h"
>> +
>> +static void __init sam9x60_init(void)
>> +{
>> +     of_platform_default_populate(NULL, NULL, NULL);
>> +
>> +     sam9x60_pm_init();
>> +}
>> +
>> +static const char *const sam9x60_dt_board_compat[] __initconst = {
>> +     "microchip,sam9x60",
>> +     NULL
>> +};
>> +
>> +DT_MACHINE_START(sam9x60_dt, "Microchip SAM9X60")
>> +     /* Maintainer: Microchip */
>> +     .init_machine   = sam9x60_init,
>> +     .dt_compat      = sam9x60_dt_board_compat,
>> +MACHINE_END
>> --
>> 2.7.4
>>
> 
> --
> Alexandre Belloni, Bootlin
> Embedded Linux and Kernel engineering
> https://bootlin.com
>