linux-kernel - Re: [PATCH] nvmem: sc27xx: add sc2730 efuse support

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Date:   Mon, 15 Jun 2020 21:50:05 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     Chunyan Zhang <zhang.lyra@...il.com>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <chunyan.zhang@...soc.com>,
        Freeman Liu <freeman.liu@...soc.com>
Subject: Re: [PATCH] nvmem: sc27xx: add sc2730 efuse support

On Mon, Jun 15, 2020 at 11:23 AM Chunyan Zhang <zhang.lyra@...il.com> wrote:
>
> From: Freeman Liu <freeman.liu@...soc.com>
>
> Add support to the new efuse IP which is integrated in the SC2730
> which includes multiple blocks in a single chip.
>
> Signed-off-by: Freeman Liu <freeman.liu@...soc.com>
> Signed-off-by: Chunyan Zhang <chunyan.zhang@...soc.com>

Looks good to me. You can add my reviewed-by tag after fixing the
comment from Srinivas.
Reviewed-by: Baolin Wang <baolin.wang7@...il.com>

> ---
>  drivers/nvmem/sc27xx-efuse.c | 34 +++++++++++++++++++++++++++++++---
>  1 file changed, 31 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/nvmem/sc27xx-efuse.c b/drivers/nvmem/sc27xx-efuse.c
> index ab5e7e0bc3d8..7d453c9d80da 100644
> --- a/drivers/nvmem/sc27xx-efuse.c
> +++ b/drivers/nvmem/sc27xx-efuse.c
> @@ -4,12 +4,14 @@
>  #include <linux/hwspinlock.h>
>  #include <linux/module.h>
>  #include <linux/of.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
>  #include <linux/nvmem-provider.h>
>
>  /* PMIC global registers definition */
>  #define SC27XX_MODULE_EN               0xc08
> +#define SC2730_MODULE_EN               0x1808
>  #define SC27XX_EFUSE_EN                        BIT(6)
>
>  /* Efuse controller registers definition */
> @@ -49,12 +51,29 @@
>  #define SC27XX_EFUSE_POLL_TIMEOUT      3000000
>  #define SC27XX_EFUSE_POLL_DELAY_US     10000
>
> +/*
> + * Since different PMICs of SC27xx series can have different
> + * address , we should save address in the device data structure.
> + */
> +struct sc27xx_efuse_variant_data {
> +       u32 module_en;
> +};
> +
>  struct sc27xx_efuse {
>         struct device *dev;
>         struct regmap *regmap;
>         struct hwspinlock *hwlock;
>         struct mutex mutex;
>         u32 base;
> +       const struct sc27xx_efuse_variant_data *var_data;
> +};
> +
> +static const struct sc27xx_efuse_variant_data sc2731_edata = {
> +       .module_en = SC27XX_MODULE_EN,
> +};
> +
> +static const struct sc27xx_efuse_variant_data sc2730_edata = {
> +       .module_en = SC2730_MODULE_EN,
>  };
>
>  /*
> @@ -119,7 +138,7 @@ static int sc27xx_efuse_read(void *context, u32 offset, void *val, size_t bytes)
>                 return ret;
>
>         /* Enable the efuse controller. */
> -       ret = regmap_update_bits(efuse->regmap, SC27XX_MODULE_EN,
> +       ret = regmap_update_bits(efuse->regmap, efuse->var_data->module_en,
>                                  SC27XX_EFUSE_EN, SC27XX_EFUSE_EN);
>         if (ret)
>                 goto unlock_efuse;
> @@ -169,7 +188,7 @@ static int sc27xx_efuse_read(void *context, u32 offset, void *val, size_t bytes)
>
>  disable_efuse:
>         /* Disable the efuse controller after reading. */
> -       regmap_update_bits(efuse->regmap, SC27XX_MODULE_EN, SC27XX_EFUSE_EN, 0);
> +       regmap_update_bits(efuse->regmap, efuse->var_data->module_en, SC27XX_EFUSE_EN, 0);
>  unlock_efuse:
>         sc27xx_efuse_unlock(efuse);
>
> @@ -187,8 +206,15 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
>         struct nvmem_config econfig = { };
>         struct nvmem_device *nvmem;
>         struct sc27xx_efuse *efuse;
> +       const struct sc27xx_efuse_variant_data *pdata;
>         int ret;
>
> +       pdata = of_device_get_match_data(&pdev->dev);
> +       if (!pdata) {
> +               dev_err(&pdev->dev, "No matching driver data found\n");
> +               return -EINVAL;
> +       }
> +
>         efuse = devm_kzalloc(&pdev->dev, sizeof(*efuse), GFP_KERNEL);
>         if (!efuse)
>                 return -ENOMEM;
> @@ -219,6 +245,7 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
>
>         mutex_init(&efuse->mutex);
>         efuse->dev = &pdev->dev;
> +       efuse->var_data = pdata;
>
>         econfig.stride = 1;
>         econfig.word_size = 1;
> @@ -238,7 +265,8 @@ static int sc27xx_efuse_probe(struct platform_device *pdev)
>  }
>
>  static const struct of_device_id sc27xx_efuse_of_match[] = {
> -       { .compatible = "sprd,sc2731-efuse" },
> +       { .compatible = "sprd,sc2731-efuse", .data = &sc2731_edata},
> +       { .compatible = "sprd,sc2730-efuse", .data = &sc2730_edata},
>         { }
>  };
>
> --
> 2.20.1
>


-- 
Baolin Wang