linux-kernel - Re: [PATCH] firmware: tegra: bpmp: Use of_reserved_mem_region_to

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Message-ID: <550bcad5-4de6-46fe-9f2d-f77ccbd582c6@nvidia.com>
Date: Mon, 28 Jul 2025 15:17:11 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: "Rob Herring (Arm)" <robh@...nel.org>,
 Thierry Reding <thierry.reding@...il.com>
Cc: linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] firmware: tegra: bpmp: Use
 of_reserved_mem_region_to_resource() for "memory-region"

Hi Rob, Thierry,

On 03/07/2025 19:34, Rob Herring (Arm) wrote:
> Use the newly added of_reserved_mem_region_to_resource() function to
> handle "memory-region" properties.
> 
> Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
> ---
>   drivers/firmware/tegra/bpmp-tegra186.c | 9 ++-------
>   1 file changed, 2 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/firmware/tegra/bpmp-tegra186.c b/drivers/firmware/tegra/bpmp-tegra186.c
> index 6f0d0511b486..7cfc5fdfa49d 100644
> --- a/drivers/firmware/tegra/bpmp-tegra186.c
> +++ b/drivers/firmware/tegra/bpmp-tegra186.c
> @@ -6,7 +6,7 @@
>   #include <linux/genalloc.h>
>   #include <linux/io.h>
>   #include <linux/mailbox_client.h>
> -#include <linux/of_address.h>
> +#include <linux/of_reserved_mem.h>
>   #include <linux/platform_device.h>
>   
>   #include <soc/tegra/bpmp.h>
> @@ -192,16 +192,11 @@ static void tegra186_bpmp_teardown_channels(struct tegra_bpmp *bpmp)
>   static int tegra186_bpmp_dram_init(struct tegra_bpmp *bpmp)
>   {
>   	struct tegra186_bpmp *priv = bpmp->priv;
> -	struct device_node *np;
>   	struct resource res;
>   	size_t size;
>   	int err;
>   
> -	np = of_parse_phandle(bpmp->dev->of_node, "memory-region", 0);
> -	if (!np)
> -		return -ENODEV;
> -
> -	err = of_address_to_resource(np, 0, &res);
> +	err = of_reserved_mem_region_to_resource(bpmp->dev->of_node, 0, &res);
>   	if (err < 0) {
>   		dev_warn(bpmp->dev, "failed to parse memory region: %d\n", err);
>   		return err;


This change is now causing the following warning to be observed on 
Tegra194 Jetson AGX Xavier platform ...

  WARNING KERN tegra-bpmp bpmp: failed to parse memory region: -19

Looking at the binding only one of 'memory-region' or 'shmem' is 
required and for Tegra194 we are using shmem. So I am not sure if it is 
worth making this change for this driver.

Jon

-- 
nvpublic