linux-kernel - Re: [PATCHv2 1/1] mmc: core: export emmc revision via sysfs

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Date:   Fri, 24 Mar 2017 09:59:52 +0900
From:   Kyungmin Park <kmpark@...radead.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Jin Qian <jinqian@...roid.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Uri Yanai <uri.yanai@...disk.com>,
        Chaotian Jing <chaotian.jing@...iatek.com>,
        Pratibhasagar V <pratibha@...eaurora.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Dong Aisheng <aisheng.dong@....com>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv2 1/1] mmc: core: export emmc revision via sysfs

On Thu, Mar 23, 2017 at 6:03 PM, Ulf Hansson <ulf.hansson@...aro.org> wrote:
> On 23 March 2017 at 01:18, Jin Qian <jinqian@...roid.com> wrote:
>> Extend sysfs to access ext_csd revision information.

it can be used secure erase feature for each revision. so it's helpful
to support at sysfs node.

Acked-by: Kyungmin Park <kyungmin.park@...sung.com>
>>
>> Signed-off-by: Jin Qian <jinqian@...roid.com>
>> ---
>>  drivers/mmc/core/mmc.c | 2 ++
>>  1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
>> index 7fd722868875..08c62c9bec48 100644
>> --- a/drivers/mmc/core/mmc.c
>> +++ b/drivers/mmc/core/mmc.c
>> @@ -779,6 +779,7 @@ MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
>>  MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
>>  MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
>>  MMC_DEV_ATTR(prv, "0x%x\n", card->cid.prv);
>> +MMC_DEV_ATTR(rev, "0x%x\n", card->ext_csd.rev);
>
> We have "product revision" in CID, we have "CSD structure/spec
> version" in CSD and some other related in EXT_CSD.
>
> To make it clear what "rev" is about, I suggest we follow Jaehoon
> suggestions. Let's name it "ext_csd_rev".
>
>>  MMC_DEV_ATTR(pre_eol_info, "%02x\n", card->ext_csd.pre_eol_info);
>>  MMC_DEV_ATTR(life_time, "0x%02x 0x%02x\n",
>>         card->ext_csd.device_life_time_est_typ_a,
>> @@ -836,6 +837,7 @@ static struct attribute *mmc_std_attrs[] = {
>>         &dev_attr_name.attr,
>>         &dev_attr_oemid.attr,
>>         &dev_attr_prv.attr,
>> +       &dev_attr_rev.attr,
>>         &dev_attr_pre_eol_info.attr,
>>         &dev_attr_life_time.attr,
>>         &dev_attr_serial.attr,
>> --
>> 2.12.1.500.gab5fba24ee-goog
>>
>
> Kind regards
> Uffe