linux-kernel - Re: [PATCH] nvmem: fix issue within nvmem

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Date:   Tue, 5 Dec 2023 08:48:27 +0000
From:   POPESCU Catalin <catalin.popescu@...ca-geosystems.com>
To:     "srinivas.kandagatla@...aro.org" <srinivas.kandagatla@...aro.org>,
        "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "michael@...le.cc" <michael@...le.cc>,
        "rafal@...ecki.pl" <rafal@...ecki.pl>,
        "robh@...nel.org" <robh@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        GEO-CHHER-bsp-development 
        <bsp-development.geo@...ca-geosystems.com>
Subject: Re: [PATCH] nvmem: fix issue within nvmem_register with fixed-layout.

Adding more people.

On 30.11.23 17:29, Catalin Popescu wrote:
> fixed-layout is natively supported by NVMEM framework.
> Yet, it's not been declared as a supported layout. As a
> result, nvmem_register always returns -EPROBE_DEFER if
> configuration has no layout and the NVMEM provider DT
> uses a fixed layout.
>
> As a fix, declare fixed-layout as a supported layout
> and use add_cells callback to parse the cells. This adds
> consistency over layouts parsing as fixed-layout parsing
> is handled in the same way than others nvmem layouts.
>
> Signed-off-by: Catalin Popescu <catalin.popescu@...ca-geosystems.com>
> ---
>   drivers/nvmem/core.c | 24 +++++++++++++++++-------
>   1 file changed, 17 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index bf42b7e826db..3467c94207e8 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -746,7 +746,9 @@ static int nvmem_add_cells_from_legacy_of(struct nvmem_device *nvmem)
>   	return nvmem_add_cells_from_dt(nvmem, nvmem->dev.of_node);
>   }
>   
> -static int nvmem_add_cells_from_fixed_layout(struct nvmem_device *nvmem)
> +static int nvmem_add_cells_from_fixed_layout(struct device *dev,
> +					     struct nvmem_device *nvmem,
> +					     struct nvmem_layout *layout)
>   {
>   	struct device_node *layout_np;
>   	int err = 0;
> @@ -755,8 +757,7 @@ static int nvmem_add_cells_from_fixed_layout(struct nvmem_device *nvmem)
>   	if (!layout_np)
>   		return 0;
>   
> -	if (of_device_is_compatible(layout_np, "fixed-layout"))
> -		err = nvmem_add_cells_from_dt(nvmem, layout_np);
> +	err = nvmem_add_cells_from_dt(nvmem, layout_np);
>   
>   	of_node_put(layout_np);
>   
> @@ -1003,10 +1004,6 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
>   			goto err_remove_cells;
>   	}
>   
> -	rval = nvmem_add_cells_from_fixed_layout(nvmem);
> -	if (rval)
> -		goto err_remove_cells;
> -
>   	rval = nvmem_add_cells_from_layout(nvmem);
>   	if (rval)
>   		goto err_remove_cells;
> @@ -2126,6 +2123,19 @@ const char *nvmem_dev_name(struct nvmem_device *nvmem)
>   }
>   EXPORT_SYMBOL_GPL(nvmem_dev_name);
>   
> +static const struct of_device_id fixed_layout_of_match_table[] = {
> +	{ .compatible = "fixed-layout", },
> +	{},
> +};
> +MODULE_DEVICE_TABLE(of, fixed_layout_of_match_table);
> +
> +static struct nvmem_layout fixed_layout = {
> +	.name = "NVMEM fixed layout",
> +	.of_match_table = fixed_layout_of_match_table,
> +	.add_cells = nvmem_add_cells_from_fixed_layout,
> +};
> +module_nvmem_layout_driver(fixed_layout);
> +
>   static int __init nvmem_init(void)
>   {
>   	return bus_register(&nvmem_bus_type);