linux-kernel - Re: [PATCH 08/12] nvmem: mtk-efuse: remove nvmem regmap dependency

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Message-ID: <1461738613.12466.8.camel@mtksdaap41>
Date:	Wed, 27 Apr 2016 14:30:13 +0800
From:	andrew-ct chen <andrew-ct.chen@...iatek.com>
To:	Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, <andrew@...n.ch>,
	"Heiko Stuebner" <heiko@...ech.de>,
	Wolfram Sang <wsa@...-dreams.de>,
	"Joachim Eastwood" <manabian@...il.com>,
	<linux-kernel@...r.kernel.org>,
	<linux-rockchip@...ts.infradead.org>, Chen-Yu Tsai <wens@...e.org>,
	"Mark Brown" <broonie@...nel.org>, <linux-i2c@...r.kernel.org>,
	Matthias Brugger <matthias.bgg@...il.com>,
	<linux-mediatek@...ts.infradead.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 08/12] nvmem: mtk-efuse: remove nvmem regmap dependency

Hi Srinivas,

On Sun, 2016-04-24 at 20:28 +0100, Srinivas Kandagatla wrote:
> This patch moves to nvmem support in the driver to use callback
> instead of regmap.
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---

Thanks for the patch. It works on our platform. This driver doesn't
support "efuse write". I will send another patch for fixing this.

Acked-by: Andrew-CT Chen <andrew-ct.chen@...iatek.com>

Andrew

>  drivers/nvmem/Kconfig     |  1 -
>  drivers/nvmem/mtk-efuse.c | 47 ++++++++++++++++++++++++++++++++---------------
>  2 files changed, 32 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/nvmem/Kconfig b/drivers/nvmem/Kconfig
> index 377bc21..c158712 100644
> --- a/drivers/nvmem/Kconfig
> +++ b/drivers/nvmem/Kconfig
> @@ -48,7 +48,6 @@ config NVMEM_MXS_OCOTP
>  config MTK_EFUSE
>  	tristate "Mediatek SoCs EFUSE support"
>  	depends on ARCH_MEDIATEK || COMPILE_TEST
> -	select REGMAP_MMIO
>  	help
>  	  This is a driver to access hardware related data like sensor
>  	  calibration, HDMI impedance etc.
> diff --git a/drivers/nvmem/mtk-efuse.c b/drivers/nvmem/mtk-efuse.c
> index 9c49369..32fd572 100644
> --- a/drivers/nvmem/mtk-efuse.c
> +++ b/drivers/nvmem/mtk-efuse.c
> @@ -14,15 +14,35 @@
>  
>  #include <linux/device.h>
>  #include <linux/module.h>
> +#include <linux/io.h>
>  #include <linux/nvmem-provider.h>
>  #include <linux/platform_device.h>
> -#include <linux/regmap.h>
>  
> -static struct regmap_config mtk_regmap_config = {
> -	.reg_bits = 32,
> -	.val_bits = 32,
> -	.reg_stride = 4,
> -};
> +static int mtk_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;
> +
> +	while (words--)
> +		*val++ = readl(base + reg + (i++ * 4));
> +
> +	return 0;
> +}
> +
> +static int mtk_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;
> +
> +	while (words--)
> +		writel(*val++, base + reg + (i++ * 4));
> +
> +	return 0;
> +}
>  
>  static int mtk_efuse_probe(struct platform_device *pdev)
>  {
> @@ -30,7 +50,6 @@ static int mtk_efuse_probe(struct platform_device *pdev)
>  	struct resource *res;
>  	struct nvmem_device *nvmem;
>  	struct nvmem_config *econfig;
> -	struct regmap *regmap;
>  	void __iomem *base;
>  
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> @@ -42,14 +61,12 @@ static int mtk_efuse_probe(struct platform_device *pdev)
>  	if (!econfig)
>  		return -ENOMEM;
>  
> -	mtk_regmap_config.max_register = resource_size(res) - 1;
> -
> -	regmap = devm_regmap_init_mmio(dev, base, &mtk_regmap_config);
> -	if (IS_ERR(regmap)) {
> -		dev_err(dev, "regmap init failed\n");
> -		return PTR_ERR(regmap);
> -	}
> -
> +	econfig->stride = 4;
> +	econfig->word_size = 4;
> +	econfig->reg_read = mtk_reg_read;
> +	econfig->reg_write = mtk_reg_write;
> +	econfig->size = resource_size(res);
> +	econfig->priv = base;
>  	econfig->dev = dev;
>  	econfig->owner = THIS_MODULE;
>  	nvmem = nvmem_register(econfig);