linux-kernel - Re: [PATCH v2] drivers: nvmem: Export nvmem_add

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Date:   Thu, 10 May 2018 17:11:00 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drivers: nvmem: Export nvmem_add_cells()

On Tue, May 8, 2018 at 3:34 PM, Andrew Lunn <andrew@...n.ch> wrote:
> Not all platforms use device tree. It is useful to be able to add
> cells to a NVMEM device from code. Export nvmem_add_cells() so making
> this possible.
>
> This required changing the parameters a bit, so that just the cells
> and the number of cells are passed, not the whole nvmem config
> structure.
>
> Signed-off-by: Andrew Lunn <andrew@...n.ch>

Reviewed-by: Andrey Smirnov <andrew.smirnov@...il.com>

> ---
> v2: Add documentation for nvmem_add_cells()
> ---
>  drivers/nvmem/core.c           | 24 +++++++++++++++++-------
>  include/linux/nvmem-provider.h | 11 +++++++++++
>  2 files changed, 28 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> index b05aa8e81303..b1c95ef78544 100644
> --- a/drivers/nvmem/core.c
> +++ b/drivers/nvmem/core.c
> @@ -353,18 +353,27 @@ static int nvmem_cell_info_to_nvmem_cell(struct nvmem_device *nvmem,
>         return 0;
>  }
>
> -static int nvmem_add_cells(struct nvmem_device *nvmem,
> -                          const struct nvmem_config *cfg)
> +/**
> + * nvmem_add_cells() - Add cell information to an nvmem device
> + *
> + * @nvmem: nvmem device to add cells to.
> + * @info: nvmem cell info to add to the device
> + * @ncells: number of cells in info
> + *
> + * Return: 0 or negative error code on failure.
> + */
> +int nvmem_add_cells(struct nvmem_device *nvmem,
> +                   const struct nvmem_cell_info *info,
> +                   int ncells)
>  {
>         struct nvmem_cell **cells;
> -       const struct nvmem_cell_info *info = cfg->cells;
>         int i, rval;
>
> -       cells = kcalloc(cfg->ncells, sizeof(*cells), GFP_KERNEL);
> +       cells = kcalloc(ncells, sizeof(*cells), GFP_KERNEL);
>         if (!cells)
>                 return -ENOMEM;
>
> -       for (i = 0; i < cfg->ncells; i++) {
> +       for (i = 0; i < ncells; i++) {
>                 cells[i] = kzalloc(sizeof(**cells), GFP_KERNEL);
>                 if (!cells[i]) {
>                         rval = -ENOMEM;
> @@ -380,7 +389,7 @@ static int nvmem_add_cells(struct nvmem_device *nvmem,
>                 nvmem_cell_add(cells[i]);
>         }
>
> -       nvmem->ncells = cfg->ncells;
> +       nvmem->ncells = ncells;
>         /* remove tmp array */
>         kfree(cells);
>
> @@ -393,6 +402,7 @@ static int nvmem_add_cells(struct nvmem_device *nvmem,
>
>         return rval;
>  }
> +EXPORT_SYMBOL_GPL(nvmem_add_cells);
>
>  /*
>   * nvmem_setup_compat() - Create an additional binary entry in
> @@ -509,7 +519,7 @@ struct nvmem_device *nvmem_register(const struct nvmem_config *config)
>         }
>
>         if (config->cells)
> -               nvmem_add_cells(nvmem, config);
> +               nvmem_add_cells(nvmem, config->cells, config->ncells);
>
>         return nvmem;
>
> diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
> index f89598bc4e1c..24def6ad09bb 100644
> --- a/include/linux/nvmem-provider.h
> +++ b/include/linux/nvmem-provider.h
> @@ -77,6 +77,9 @@ struct nvmem_device *devm_nvmem_register(struct device *dev,
>
>  int devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem);
>
> +int nvmem_add_cells(struct nvmem_device *nvmem,
> +                   const struct nvmem_cell_info *info,
> +                   int ncells);
>  #else
>
>  static inline struct nvmem_device *nvmem_register(const struct nvmem_config *c)
> @@ -99,6 +102,14 @@ static inline int
>  devm_nvmem_unregister(struct device *dev, struct nvmem_device *nvmem)
>  {
>         return nvmem_unregister(nvmem);
> +
> +}
> +
> +static inline int nvmem_add_cells(struct nvmem_device *nvmem,
> +                                 const struct nvmem_cell_info *info,
> +                                 int ncells)
> +{
> +       return -ENOSYS;
>  }
>
>  #endif /* CONFIG_NVMEM */
> --
> 2.17.0
>