linux-kernel - Re: [PATCH 1/1] remoteproc: mediatek: Support multiple reserved memory regions

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Message-ID: <Zo6vMPaefxCaDe7D@p14s>
Date: Wed, 10 Jul 2024 09:56:32 -0600
From: Mathieu Poirier <mathieu.poirier@...aro.org>
To: Shun-yi Wang <shun-yi.wang@...iatek.com>
Cc: Bjorn Andersson <andersson@...nel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	Project_Global_Chrome_Upstream_Group@...iatek.com,
	jason-ch.chen@...iatek.com, yaya.chang@...iatek.com,
	teddy.chen@...iatek.com, olivia.wen@...iatek.com
Subject: Re: [PATCH 1/1] remoteproc: mediatek: Support multiple reserved
 memory regions

On Wed, Jul 03, 2024 at 07:53:08PM +0800, Shun-yi Wang wrote:
> From: "shun-yi.wang" <shun-yi.wang@...iatek.com>
> 
> SCP supports multiple reserved memory regions, intended for
> specific hardwards.
>
> Signed-off-by: shun-yi.wang <shun-yi.wang@...iatek.com>
> ---
>  drivers/remoteproc/mtk_scp.c | 25 +++++++++++++++++--------
>  1 file changed, 17 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
> index 9ecd5ea04b5f3..1902826cea0af 100644
> --- a/drivers/remoteproc/mtk_scp.c
> +++ b/drivers/remoteproc/mtk_scp.c
> @@ -1006,22 +1006,31 @@ EXPORT_SYMBOL_GPL(scp_mapping_dm_addr);
>  
>  static int scp_map_memory_region(struct mtk_scp *scp)
>  {
> -	int ret;
> +	int ret, i, err;
>  	const struct mtk_scp_sizes_data *scp_sizes;
> +	struct device_node *node = scp->dev->of_node;
> +	struct of_phandle_iterator it;
> +
> +	i = 0;
> +	of_for_each_phandle(&it, err, node, "memory-region", NULL, 0) {
> +		ret = of_reserved_mem_device_init_by_idx(scp->dev, node, i);
> +
> +		if (ret) {
> +			dev_err(scp->dev, "failed to assign memory-region: %s\n",
> +				it.node->name);
> +			of_node_put(it.node);
> +			return -ENOMEM;
> +		}

With this patch the code is out of sync with the bindings which are still
specifying a maxItems of 1 - please address.

Thanks,
Mathieu

>  
> -	ret = of_reserved_mem_device_init(scp->dev);
> +		i++;
> +	}
>  
>  	/* reserved memory is optional. */
> -	if (ret == -ENODEV) {
> +	if (!i) {
>  		dev_info(scp->dev, "skipping reserved memory initialization.");
>  		return 0;
>  	}
>  
> -	if (ret) {
> -		dev_err(scp->dev, "failed to assign memory-region: %d\n", ret);
> -		return -ENOMEM;
> -	}
> -
>  	/* Reserved SCP code size */
>  	scp_sizes = scp->data->scp_sizes;
>  	scp->cpu_addr = dma_alloc_coherent(scp->dev, scp_sizes->max_dram_size,
> -- 
> 2.18.0
>