Re: [PATCH v2 4/8] of: add flag to not create resmem DT entries

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

On 03.08.21 11:44, Rouven Czerwinski wrote:
> If we are parsing entries from the /reserved-memory device tree path we
> don't want to add them again as resmem blocks at the beginning of the
> device tree. Therefore add another flag to indicate this.
> 
> Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
> ---
>  drivers/of/fdt.c | 10 +++++++---
>  include/of.h     |  2 ++
>  2 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
> index 9356a92c5c..030f1233d5 100644
> --- a/drivers/of/fdt.c
> +++ b/drivers/of/fdt.c
> @@ -559,6 +559,9 @@ int of_add_reserve_entry(resource_size_t start, resource_size_t end,
>  	if (flags & OF_RESERVE_ENTRY_FLAG_XN)
>  		of_reserve_map.xn |= BIT(e);
>  
> +	if (flags & OF_RESERVE_ENTRY_FLAG_NO_RESERVE)

Did I say before I dislike the name? Perhaps something like OF_RESERVE_ENTRY_FLAG_NO_FIXUP?

> +		of_reserve_map.noentry |= BIT(e);
> +
>  	return 0;
>  }
>  
> @@ -601,9 +604,10 @@ void fdt_add_reserve_map(void *__fdt)
>  	fdt_res += n;
>  
>  	for (i = 0; i < res->num_entries; i++) {
> -		of_write_number(&fdt_res->address, res->start[i], 2);
> -		of_write_number(&fdt_res->size, res->end[i] - res->start[i] + 1,
> -				2);
> +		if (!(res->noentry & BIT(i))) {

Nitpick: invert the condition and using continue is clearer IMO.

> +			of_write_number(&fdt_res->address, res->start[i], 2);
> +			of_write_number(&fdt_res->size, res->end[i] - res->start[i] + 1, 2);
> +		}
>  		fdt_res++;
>  	}
>  
> diff --git a/include/of.h b/include/of.h
> index 36936ecd6e..209d2898ae 100644
> --- a/include/of.h
> +++ b/include/of.h
> @@ -56,9 +56,11 @@ struct of_reserve_map {
>  	uint64_t end[OF_MAX_RESERVE_MAP];
>  	int num_entries;
>  	u16 xn;
> +	u16 reserved_entry;
>  };
>  
>  #define OF_RESERVE_ENTRY_FLAG_XN		BIT(0)
> +#define OF_RESERVE_ENTRY_FLAG_NO_RESERVE	BIT(1)
>  
>  int of_add_reserve_entry(resource_size_t start, resource_size_t end,
>  		 int flags);
> 


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