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Subject: Re: [PATCH v2 1/4] pmbus: associate PMBUS_SKIP_STATUS_CHECK with
 driver_data
To:     Xiaoting Liu <xiaoting.liu@hxt-semitech.com>, jdelvare@suse.com
Cc:     openbmc@lists.ozlabs.org, linux-hwmon@vger.kernel.org,
        linux-kernel@vger.kernel.org, shunyong.yang@hxt-semitech.com,
        dongsheng.wang@hxt-semitech.com
References: <cover.1546851856.git.xiaoting.liu@hxt-semitech.com>
 <b336867f159242e141f21e2bef7182adbc624fbd.1546851856.git.xiaoting.liu@hxt-semitech.com>
From:   Guenter Roeck <linux@roeck-us.net>
Message-ID: <db6cdd06-c895-566c-0514-fe56a362d215@roeck-us.net>
Date:   Mon, 7 Jan 2019 06:04:10 -0800
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On 1/7/19 2:57 AM, Xiaoting Liu wrote:
> Current code compares device name with name in i2c_device_id to decide
> whether PMBUS_SKIP_STATUS_CHECK should be set in pmbus_platform_data,
> which makes adding new devices with PMBUS_SKIP_STATUS_CHECK should also
> modify code in pmbus_probe().
> 
> This patch adds pmbus_device_info to save pages and flags. Its pointer
> is put in driver_data of i2c_device_id, which makes adding new device
> more straightforward.
> 
> Signed-off-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
> Signed-off-by: Xiaoting Liu <xiaoting.liu@hxt-semitech.com>
> ---
> v2:
>    Move struct pmbus_device_info definition location from pmbus.h to pmbus.c.
>    Change struct name from default_pmbus_info to pmbus_info_one.
>    Change struct name from pmbus_info to pmbus_info_zero.
>    Replace struct name dps460_pmbus_info and sgd009_pmbus_info with
>    pmbus_info_one_skip.
> ---
>   drivers/hwmon/pmbus/pmbus.c | 55 +++++++++++++++++++++++++++------------------
>   1 file changed, 33 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/hwmon/pmbus/pmbus.c b/drivers/hwmon/pmbus/pmbus.c
> index 7688dab32f6e..e38dd97cc49a 100644
> --- a/drivers/hwmon/pmbus/pmbus.c
> +++ b/drivers/hwmon/pmbus/pmbus.c
> @@ -28,6 +28,11 @@
>   #include <linux/pmbus.h>
>   #include "pmbus.h"
> 
> +struct pmbus_device_info {
> +       int pages;
> +       u32 flags;
> +};
> +
>   /*
>    * Find sensor groups and status registers on each page.
>    */
> @@ -172,13 +177,15 @@ static int pmbus_probe(struct i2c_client *client,
>          struct pmbus_driver_info *info;
>          struct pmbus_platform_data *pdata = NULL;
>          struct device *dev = &client->dev;
> +       struct pmbus_device_info *device_info;
> 
>          info = devm_kzalloc(dev, sizeof(struct pmbus_driver_info), GFP_KERNEL);
>          if (!info)
>                  return -ENOMEM;
> 
> -       if (!strcmp(id->name, "dps460") || !strcmp(id->name, "dps800") ||
> -           !strcmp(id->name, "sgd009")) {
> +       device_info = (struct pmbus_device_info *)id->driver_data;
> +

Please no empty line between assignments and checking its results.

> +       if (device_info->flags & PMBUS_SKIP_STATUS_CHECK) {
>                  pdata = devm_kzalloc(dev, sizeof(struct pmbus_platform_data),
>                                       GFP_KERNEL);
>                  if (!pdata)
> @@ -187,36 +194,40 @@ static int pmbus_probe(struct i2c_client *client,
>                  pdata->flags = PMBUS_SKIP_STATUS_CHECK;
>          }
> 
> -       info->pages = id->driver_data;
> +       info->pages = device_info->pages;
>          info->identify = pmbus_identify;
>          dev->platform_data = pdata;
> 
>          return pmbus_do_probe(client, id, info);
>   }
> 
> +static const struct pmbus_device_info pmbus_info_one = {1, 0};
> +static const struct pmbus_device_info pmbus_info_zero = {0, 0};
> +static const struct pmbus_device_info pmbus_info_one_skip = {
> +                               1, PMBUS_SKIP_STATUS_CHECK};
>   /*
>    * Use driver_data to set the number of pages supported by the chip.
>    */
>   static const struct i2c_device_id pmbus_id[] = {
> -       {"adp4000", 1},
> -       {"bmr453", 1},
> -       {"bmr454", 1},
> -       {"dps460", 1},
> -       {"dps800", 1},
> -       {"mdt040", 1},
> -       {"ncp4200", 1},
> -       {"ncp4208", 1},
> -       {"pdt003", 1},
> -       {"pdt006", 1},
> -       {"pdt012", 1},
> -       {"pmbus", 0},
> -       {"sgd009", 1},
> -       {"tps40400", 1},
> -       {"tps544b20", 1},
> -       {"tps544b25", 1},
> -       {"tps544c20", 1},
> -       {"tps544c25", 1},
> -       {"udt020", 1},
> +       {"adp4000", (kernel_ulong_t)&pmbus_info_one},
> +       {"bmr453", (kernel_ulong_t)&pmbus_info_one},
> +       {"bmr454", (kernel_ulong_t)&pmbus_info_one},
> +       {"dps460", (kernel_ulong_t)&pmbus_info_one_skip},
> +       {"dps800", (kernel_ulong_t)&pmbus_info_one_skip},
> +       {"mdt040", (kernel_ulong_t)&pmbus_info_one},
> +       {"ncp4200", (kernel_ulong_t)&pmbus_info_one},
> +       {"ncp4208", (kernel_ulong_t)&pmbus_info_one},
> +       {"pdt003", (kernel_ulong_t)&pmbus_info_one},
> +       {"pdt006", (kernel_ulong_t)&pmbus_info_one},
> +       {"pdt012", (kernel_ulong_t)&pmbus_info_one},
> +       {"pmbus", (kernel_ulong_t)&pmbus_info_zero},
> +       {"sgd009", (kernel_ulong_t)&pmbus_info_one_skip},
> +       {"tps40400", (kernel_ulong_t)&pmbus_info_one},
> +       {"tps544b20", (kernel_ulong_t)&pmbus_info_one},
> +       {"tps544b25", (kernel_ulong_t)&pmbus_info_one},
> +       {"tps544c20", (kernel_ulong_t)&pmbus_info_one},
> +       {"tps544c25", (kernel_ulong_t)&pmbus_info_one},
> +       {"udt020", (kernel_ulong_t)&pmbus_info_one},
>          {}
>   };
> 
> --
> 1.8.3.1
> 
> 
> 
> 
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> 

I think I mentioned that before. This legalese makes it all but impossible
for me to apply your patches.

Guenter