linux-kernel - RE: [PATCH v2 2/3] eeprom: at24: add support to fetch eeprom device property "size"

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Date:   Wed, 30 Aug 2017 03:57:41 +0000
From:   "Mohandass, Divagar" <divagar.mohandass@...el.com>
To:     Sakari Ailus <sakari.ailus@....fi>
CC:     "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "wsa@...-dreams.de" <wsa@...-dreams.de>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Mani, Rajmohan" <rajmohan.mani@...el.com>
Subject: RE: [PATCH v2 2/3] eeprom: at24: add support to fetch eeprom device
 property "size"

Hi Sakari,

Thanks for your review comments. Will address it in next patch version.

---
^Divagar

>-----Original Message-----
>From: Sakari Ailus [mailto:sakari.ailus@....fi]
>Sent: Tuesday, August 22, 2017 2:43 PM
>To: Mohandass, Divagar <divagar.mohandass@...el.com>
>Cc: robh+dt@...nel.org; mark.rutland@....com; wsa@...-dreams.de;
>devicetree@...r.kernel.org; linux-i2c@...r.kernel.org; linux-
>kernel@...r.kernel.org; Mani, Rajmohan <rajmohan.mani@...el.com>
>Subject: Re: [PATCH v2 2/3] eeprom: at24: add support to fetch eeprom
>device property "size"
>
>Hi Divagar,
>
>On Tue, Aug 15, 2017 at 12:11:58AM +0530, Divagar Mohandass wrote:
>> This adds support to fetch device property "size" from _DSD.
>>
>> There is a CAT24C16/GT24C16S NVMEM chip part of the OV13858 camera
>> module and it is connected to i2c bus on Intel KBL board.
>> This device will use the existing ACPI ID INT3499 and platform fw will
>> expose "read-only", "pagesize" and "size" props via _DSD.
>
>Instead of the two paragraphs, how about:
>
>Obtain the size of the EEPROM chip from DT if the "size" property is specified
>for the device.
>
>>
>> Signed-off-by: Divagar Mohandass <divagar.mohandass@...el.com>
>> ---
>>  drivers/misc/eeprom/at24.c | 4 ++++
>>  1 file changed, 4 insertions(+)
>>
>> diff --git a/drivers/misc/eeprom/at24.c b/drivers/misc/eeprom/at24.c
>> index 764ff5df..2199c42 100644
>> --- a/drivers/misc/eeprom/at24.c
>> +++ b/drivers/misc/eeprom/at24.c
>> @@ -570,6 +570,10 @@ static void at24_get_pdata(struct device *dev,
>struct at24_platform_data *chip)
>>  	if (device_property_present(dev, "read-only"))
>>  		chip->flags |= AT24_FLAG_READONLY;
>>
>> +	err = device_property_read_u32(dev, "size", &val);
>> +	if (!err)
>> +		chip->byte_len = val;
>> +
>>  	err = device_property_read_u32(dev, "pagesize", &val);
>>  	if (!err) {
>>  		chip->page_size = val;
>> --
>> 1.9.1
>>
>
>--
>Sakari Ailus
>e-mail: sakari.ailus@....fi