linux-kernel - Re: [PATCH v7 2/9] nvmem: Add a simple NVMEM framework for consumers

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Date:	Fri, 10 Jul 2015 03:42:57 -0700
From:	Joe Perches <joe@...ches.com>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh+dt@...nel.org>,
	Kumar Gala <galak@...eaurora.org>,
	Mark Brown <broonie@...nel.org>, s.hauer@...gutronix.de,
	linux-api@...r.kernel.org, linux-kernel@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	arnd@...db.de, sboyd@...eaurora.org,
	pantelis.antoniou@...sulko.com, mporter@...sulko.com,
	stefan.wahren@...e.com, wxt@...k-chips.com,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Subject: Re: [PATCH v7 2/9] nvmem: Add a simple NVMEM framework for consumers

On Fri, 2015-07-10 at 10:44 +0100, Srinivas Kandagatla wrote:
> This patch adds just consumers part of the framework just to enable easy
> review.

Trivial notes:

> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
> @@ -334,6 +335,7 @@ struct nvmem_device *nvmem_register(struct nvmem_config *config)
>  	if (config->cells)
>  		nvmem_add_cells(nvmem, config);
>  
> +

superfluous newline

> +static struct nvmem_cell *nvmem_cell_get_from_list(const char *cell_id)
> +{
> +	struct nvmem_cell *cell = NULL;
> +	struct nvmem_device *nvmem;
> +
> +	nvmem = __nvmem_device_get(NULL, &cell, cell_id);
> +	if (IS_ERR(nvmem))
> +		return ERR_CAST(nvmem);
> +
> +

extra blank line here too

> +/**
> + * nvmem_cell_read() - Read a given nvmem cell
> + *
> + * @cell: nvmem cell to be read.
> + * @len: pointer to length of cell which will be populated on successful read.
> + *
> + * The return value will be an ERR_PTR() on error or a valid pointer
> + * to a char * bufffer.  The buffer should be freed by the consumer with a

One too many f's in buffer, it's returning a void *

> + * kfree().
> + */
> +void *nvmem_cell_read(struct nvmem_cell *cell, size_t *len)
> +{
> +	struct nvmem_device *nvmem = cell->nvmem;
> +	u8 *buf;
[]
> +	return buf;
> +}
> +EXPORT_SYMBOL_GPL(nvmem_cell_read);

[]

> +/**
> + * nvmem_cell_write() - Write to a given nvmem cell
> + *
> + * @cell: nvmem cell to be written.
> + * @buf: Buffer to be written.
> + * @len: length of buffer to be written to nvmem cell.
> + *
> + * The return value will be an length of bytes written or non zero on failure.

less than zero or maybe negative on failure?

> + */
> +int nvmem_cell_write(struct nvmem_cell *cell, void *buf, size_t len)
> +{
> +	struct nvmem_device *nvmem = cell->nvmem;
> +	int rc;
> +	void *wbuf = buf;

This variable and assignment seems unnecessary as buf could be reused.

> +
> +	if (!nvmem || !nvmem->regmap || nvmem->read_only ||
> +	    (cell->bit_offset == 0 && len != cell->bytes))
> +		return -EINVAL;
> +
> +	if (cell->bit_offset || cell->nbits) {
> +		wbuf = nvmem_cell_prepare_write_buffer(cell, buf, len);
> +		if (IS_ERR(wbuf))
> +			return PTR_ERR(wbuf);
> +	}
> +
> +	rc = regmap_raw_write(nvmem->regmap, cell->offset, wbuf, cell->bytes);
> +
> +	/* free the tmp buffer */
> +	if (cell->bit_offset)
> +		kfree(wbuf);
> +
> +	if (IS_ERR_VALUE(rc))
> +		return rc;
> +
> +	return len;
> +}
> +EXPORT_SYMBOL_GPL(nvmem_cell_write);


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