linux-kernel - Re: [PATCH v7 3/9] nvmem: Add nvmem

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Date:	Tue, 14 Jul 2015 15:06:07 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
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, pantelis.antoniou@...sulko.com,
	mporter@...sulko.com, stefan.wahren@...e.com, wxt@...k-chips.com
Subject: Re: [PATCH v7 3/9] nvmem: Add nvmem_device based consumer apis.

On 07/10, Srinivas Kandagatla wrote:
> +static int devm_nvmem_device_match(struct device *dev, void *res, void *data)
> +{
> +	struct nvmem_device **nvmem = res;
> +
> +	if (!nvmem || !*nvmem) {
> +		WARN_ON(!nvmem || !*nvmem);

This could be

	if (WARN_ON(!nvmem || !*nvmem))

> +		return 0;
> +	}
> +	return *nvmem == data;
> +}
> +
> [..]
> +
> +/**
> + * nvmem_device_write() - Write cell to a given nvmem device
> + *
> + * @nvmem: nvmem device to be written to.
> + * @offset: offset in nvmem device.
> + * @bytes: number of bytes to write.
> + * @buf: buffer to be written.
> + *
> + * The return value will be an length of bytes written or non zero on failure.

Should say negative value instead of non-zero? Length is
non-zero already.

General nitpick comment: Kernel-doc allows for a standard return
syntax.

	Return: length of bytes written or negative value on failure.

> diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h
> index f589d3b..74eed42 100644
> --- a/include/linux/nvmem-provider.h
> +++ b/include/linux/nvmem-provider.h
> @@ -12,15 +12,9 @@
>  #ifndef _LINUX_NVMEM_PROVIDER_H
>  #define _LINUX_NVMEM_PROVIDER_H
>  
> -struct nvmem_device;
> +#include <linux/nvmem-consumer.h>
>  
> -struct nvmem_cell_info {
> -	const char		*name;
> -	int			offset;
> -	int			bytes;
> -	int			bit_offset;
> -	int			nbits;
> -};

Why does this move from provider to consumer? Can't we do put
this struct in the right place from the beginning?

> +struct nvmem_device;

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