On 30.09.2014 17:13, Arnd Bergmann wrote:
> On Tuesday 30 September 2014 20:04:55 Abhilash Kesavan wrote:
>> --- a/arch/arm/mach-s3c64xx/irq-pm.c
>> +++ b/arch/arm/mach-s3c64xx/irq-pm.c
>> @@ -55,10 +55,10 @@ static struct irq_grp_save {
>> u32 mask;
>> } eint_grp_save[5];
>>
>> -#ifndef CONFIG_SERIAL_SAMSUNG_UARTS
>> -#define SERIAL_SAMSUNG_UARTS 0
>> +#ifndef CONFIG_SERIAL_SAMSUNG
>> +#define SERIAL_SAMSUNG_UARTS 0
>> #else
>> -#define SERIAL_SAMSUNG_UARTS CONFIG_SERIAL_SAMSUNG_UARTS
>> +#define SERIAL_SAMSUNG_UARTS 4
>> #endif
>>
>> static u32 irq_uart_mask[SERIAL_SAMSUNG_UARTS];
>
> I think this won't work because now you access invalid registers
> on machines that have only three uarts.
Both S3C6400 and S3C6410 SoCs have 4 UART blocks. AFAICT
CONFIG_SERIAL_SAMSUNG_UARTS was always set to 4 on ARCH_S3C64XX.
>
>> diff --git a/arch/arm/plat-samsung/init.c b/arch/arm/plat-samsung/init.c
>> index 11fbbc2..03cafe9 100644
>> --- a/arch/arm/plat-samsung/init.c
>> +++ b/arch/arm/plat-samsung/init.c
>> @@ -93,8 +93,8 @@ void __init s3c24xx_init_clocks(int xtal)
>> #if IS_ENABLED(CONFIG_SAMSUNG_ATAGS)
>> static int nr_uarts __initdata = 0;
>>
>> -#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
>> -static struct s3c2410_uartcfg uart_cfgs[CONFIG_SERIAL_SAMSUNG_UARTS];
>> +#ifdef CONFIG_SERIAL_SAMSUNG
>> +static struct s3c2410_uartcfg uart_cfgs[4];
Abhilash: Instead of using 4 directly, you could define a constant for it.
>> #endif
>>
>> /* s3c24xx_init_uartdevs
>> @@ -110,7 +110,7 @@ void __init s3c24xx_init_uartdevs(char *name,
>> struct s3c24xx_uart_resources *res,
>> struct s3c2410_uartcfg *cfg, int no)
>> {
>> -#ifdef CONFIG_SERIAL_SAMSUNG_UARTS
>> +#ifdef CONFIG_SERIAL_SAMSUNG
>> struct platform_device *platdev;
>> struct s3c2410_uartcfg *cfgptr = uart_cfgs;
>> struct s3c24xx_uart_resources *resp;
>
> Since you hardcode the number here now, you can actually drop this #ifdef.
I believe what Abhilash did is correct, because this code is not needed
when there is no serial support enabled.
Best regards,
Tomasz
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