linux-kernel - Re: [PATCH v2] nvmem: qfprom: Allow single byte accesses for read/write

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Date:   Wed, 4 Jan 2017 14:07:16 +0000
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Vivek Gautam <vivek.gautam@...eaurora.org>
Cc:     maxime.ripard@...e-electrons.com, gregkh@...uxfoundation.org,
        sboyd@...eaurora.org, rnayak@...eaurora.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v2] nvmem: qfprom: Allow single byte accesses for
 read/write

Thanks for the Patch,

I will queue this up!!

On 17/11/16 05:59, Vivek Gautam wrote:
> The nvmem core driver supports to read and write single
> byte. So, allow qfprom to support this feature.
> This change helps in extracting a required value based
> on bit-offset and number of bits for the required value
> in the nvmem cell.
>
> Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
> Cc: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>
> Based on torvalds's master branch.
>  - Tested on db410c (apq8016) and ifc6410 (apq 8064) targets
>    for thermal sensors (could read the core temperatures); and
>    on db820c (msm8996) for qusb2 phy, with tree [1] based on
>    linaro qcom landing team's integration tree.
>
> Changes in v2:
>  - Updated commit title, since the patch does extend the feature,
>    rather than fixing any kind of bug in the code.
>
>    Original title (v1): nvmem: qfprom: Fix to support single byte read/write
>    Update title (v2): nvmem: qfprom: Allow single byte accesses for read/write.
>
>  - Added some more info in the commit message as well.
>
>  ** NO change in the code.
>
> [1] https://github.com/vivekgautam1/linux/tree/linaro/integration-linux-qcomlt-qcom-phy-upstream
>
>  drivers/nvmem/qfprom.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/nvmem/qfprom.c b/drivers/nvmem/qfprom.c
> index b5305f0..2bdb6c3 100644
> --- a/drivers/nvmem/qfprom.c
> +++ b/drivers/nvmem/qfprom.c
> @@ -21,11 +21,11 @@ static int qfprom_reg_read(void *context,
>  			unsigned int reg, void *_val, size_t bytes)
>  {
>  	void __iomem *base = context;
> -	u32 *val = _val;
> -	int i = 0, words = bytes / 4;
> +	u8 *val = _val;
> +	int i = 0, words = bytes;
>
>  	while (words--)
> -		*val++ = readl(base + reg + (i++ * 4));
> +		*val++ = readb(base + reg + i++);
>
>  	return 0;
>  }
> @@ -34,11 +34,11 @@ static int qfprom_reg_write(void *context,
>  			 unsigned int reg, void *_val, size_t bytes)
>  {
>  	void __iomem *base = context;
> -	u32 *val = _val;
> -	int i = 0, words = bytes / 4;
> +	u8 *val = _val;
> +	int i = 0, words = bytes;
>
>  	while (words--)
> -		writel(*val++, base + reg + (i++ * 4));
> +		writeb(*val++, base + reg + i++);
>
>  	return 0;
>  }
> @@ -53,7 +53,7 @@ static int qfprom_remove(struct platform_device *pdev)
>  static struct nvmem_config econfig = {
>  	.name = "qfprom",
>  	.owner = THIS_MODULE,
> -	.stride = 4,
> +	.stride = 1,
>  	.word_size = 1,
>  	.reg_read = qfprom_reg_read,
>  	.reg_write = qfprom_reg_write,
>