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Date: Thu, 15 Oct 2015 17:39:59 +0900
From: Chanwoo Choi <cw00.choi@...sung.com>
To: Roger Quadros <rogerq@...com>, linux-kernel@...r.kernel.org
Cc: k.kozlowski@...sung.com, ckeepax@...nsource.wolfsonmicro.com,
gregkh@...uxfoundation.org, ramakrishna.pallala@...el.com,
patches@...nsource.wolfsonmicro.com, myungjoo.ham@...sung.com
Subject: Re: [PATCH v4] extcon: Modify the id and name of external connector
Roger,
On 2015년 10월 15일 16:16, Roger Quadros wrote:
> Chanwoo,
>
> On 15/10/15 05:22, Chanwoo Choi wrote:
>> Hi Roger,
>>
>> On 2015년 10월 14일 16:13, Roger Quadros wrote:
>>> Chanwoo,
>>>
>>> On 08/10/15 12:24, Chanwoo Choi wrote:
>>>> This patch modifies the id and name of external connector with the
>>>> additional prefix to clarify both attribute and meaning of external
>>>> connector as following:
>>>> - EXTCON_CHG_* mean the charger connector.
>>>> - EXTCON_JACK_* mean the jack connector.
>>>> - EXTCON_DISP_* mean the display port connector.
>>>>
>>>> Following table show the new name of external connector with old name:
>>>> --------------------------------------------------
>>>> Old extcon name | New extcon name |
>>>> --------------------------------------------------
>>>> EXTCON_TA | EXTCON_CHG_USB_DCP |
>>>> EXTCON_CHARGE_DOWNSTREAM| EXTCON_CHG_USB_CDP |
>>>> EXTCON_FAST_CHARGER | EXTCON_CHG_USB_FAST |
>>>> EXTCON_SLOW_CHARGER | EXTCON_CHG_USB_SLOW |
>>>> --------------------------------------------------
>>>> EXTCON_MICROPHONE | EXTCON_JACK_MICROPHONE |
>>>> EXTCON_HEADPHONE | EXTCON_JACK_HEADPHONE |
>>>> EXTCON_LINE_IN | EXTCON_JACK_LINE_IN |
>>>> EXTCON_LINE_OUT | EXTCON_JACK_LINE_OUT |
>>>> EXTCON_VIDEO_IN | EXTCON_JACK_VIDEO_IN |
>>>> EXTCON_VIDEO_OUT | EXTCON_JACK_VIDEO_OUT |
>>>> EXTCON_SPDIF_IN | EXTCON_JACK_SPDIF_IN |
>>>> EXTCON_SPDIF_OUT | EXTCON_JACK_SPDIF_OUT |
>>>> --------------------------------------------------
>>>> EXTCON_HMDI | EXTCON_DISP_HDMI |
>>>> EXTCON_MHL | EXTCON_DISP_MHL |
>>>> EXTCON_DVI | EXTCON_DISP_DVI |
>>>> EXTCON_VGA | EXTCON_DISP_VGA |
>>>> --------------------------------------------------
>>>>
>>>> And, when altering the name of USB charger connector, EXTCON refers to the
>>>> "Battery Charging v1.2 Spec and Adopters Agreement"[1] to use the standard
>>>> name of USB charging port as following. Following name of USB charging port
>>>> are already used in power_supply subsystem. We chan check it on patch[2].
>>>> - EXTCON_CHG_USB_SDP /* Standard Downstream Port */
>>>> - EXTCON_CHG_USB_DCP /* Dedicated Charging Port */
>>>> - EXTCON_CHG_USB_CDP /* Charging Downstream Port */
>>>> - EXTCON_CHG_USB_ACA /* Accessory Charger Adapter */
>>>>
>>>> [1] www.usb.org/developers/docs/devclass_docs/BCv1.2_070312.zip
>>>> [2] commit 85efc8a18ced ("power_supply: Add types for USB chargers")
>>>>
>>>> Signed-off-by: Chanwoo Choi <cw00.choi@...sung.com>
>>>> [ckeepax: For the Arizona changes]
>>>> Acked-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
>>>> ---
>>>> Changes from v3:
>>>> (https://lkml.org/lkml/2015/10/6/984)
>>>> - Modify the name of fast/slow charger connector as following:
>>>> : EXTCON_CHG_USB_DCP_FAST -> EXTCON_CHG_USB_FAST
>>>> : EXTCON_CHG_USB_DCP_SLOW -> EXTCON_CHG_USB_SLOW
>>>> - Add EXTCON_CHG_USB_SDP to mean the charging connector of SDP (Standard
>>>> Downstream Port)
>>>>
>>>> Changes from v2:
>>>> (https://lkml.org/lkml/2015/10/6/239)
>>>> - Remove the EXTCON_CHG_USB type to remove the possible confusion according to
>>>> Roger's comment and drop patch2 about EXTCON_CHG_USB.
>>>> - Fix the warning issue provided by scripts/checkpatch.pl
>>>>
>>>> Changes from v1:
>>>> (https://lkml.org/lkml/2015/10/3/304)
>>>> - Add acked tag by Charles Keepax for arizona changes
>>>> - Modify the name of USB charger connector as following:
>>>> : EXTCON_CHG_USB_FAST -> EXTCON_CHG_USB_DCP_FAST
>>>> : EXTCON_CHG_USB_SLOW -> EXTCON_CHG_USB_DCP_SLOW
>>>> - Add the missing EXTCON_CHG_USB_ACA charger connector
>>>> - Add one more patch to support the EXTCON_CHG_USB when SDP port is
>>>> connected or not
>>>>
>>>> drivers/extcon/extcon-arizona.c | 18 ++++++------
>>>> drivers/extcon/extcon-axp288.c | 12 ++++----
>>>> drivers/extcon/extcon-max14577.c | 17 +++++------
>>>> drivers/extcon/extcon-max77693.c | 32 +++++++++++----------
>>>> drivers/extcon/extcon-max77843.c | 27 +++++++++--------
>>>> drivers/extcon/extcon-max8997.c | 21 +++++++-------
>>>> drivers/extcon/extcon-rt8973a.c | 4 +--
>>>> drivers/extcon/extcon-sm5502.c | 4 +--
>>>> drivers/extcon/extcon.c | 61 ++++++++++++++++++++-------------------
>>>> include/linux/extcon.h | 62 +++++++++++++++++++++++-----------------
>>>> 10 files changed, 139 insertions(+), 119 deletions(-)
>>>>
>
> <snip>
>
>>>> diff --git a/drivers/extcon/extcon-rt8973a.c b/drivers/extcon/extcon-rt8973a.c
>>>> index 1bc3737ea01c..36bf1d63791c 100644
>>>> --- a/drivers/extcon/extcon-rt8973a.c
>>>> +++ b/drivers/extcon/extcon-rt8973a.c
>>>> @@ -93,7 +93,7 @@ static struct reg_data rt8973a_reg_data[] = {
>>>> static const unsigned int rt8973a_extcon_cable[] = {
>>>> EXTCON_USB,
>>>> EXTCON_USB_HOST,
>>>> - EXTCON_TA,
>>>> + EXTCON_CHG_USB_DCP,
>>>> EXTCON_JIG,
>>>> EXTCON_NONE,
>>>> };
>>>> @@ -333,7 +333,7 @@ static int rt8973a_muic_cable_handler(struct rt8973a_muic_info *info,
>>>> con_sw = DM_DP_SWITCH_USB;
>>>> break;
>>>> case RT8973A_MUIC_ADC_TA:
>>>> - id = EXTCON_TA;
>>>> + id = EXTCON_CHG_USB_DCP;
>>>> con_sw = DM_DP_SWITCH_OPEN;
>>>> break;
>>>> case RT8973A_MUIC_ADC_FACTORY_MODE_BOOT_OFF_USB:
>>>> diff --git a/drivers/extcon/extcon-sm5502.c b/drivers/extcon/extcon-sm5502.c
>>>> index 2945091bfd0e..7aac3cc7efd7 100644
>>>> --- a/drivers/extcon/extcon-sm5502.c
>>>> +++ b/drivers/extcon/extcon-sm5502.c
>>>> @@ -95,7 +95,7 @@ static struct reg_data sm5502_reg_data[] = {
>>>> static const unsigned int sm5502_extcon_cable[] = {
>>>> EXTCON_USB,
>>>> EXTCON_USB_HOST,
>>>> - EXTCON_TA,
>>>> + EXTCON_CHG_USB_DCP,
>>>> EXTCON_NONE,
>>>> };
>>>>
>>>> @@ -389,7 +389,7 @@ static int sm5502_muic_cable_handler(struct sm5502_muic_info *info,
>>>> vbus_sw = VBUSIN_SWITCH_VBUSOUT_WITH_USB;
>>>> break;
>>>> case SM5502_MUIC_ADC_OPEN_TA:
>>>> - id = EXTCON_TA;
>>>> + id = EXTCON_CHG_USB_DCP;
>>>> con_sw = DM_DP_SWITCH_OPEN;
>>>> vbus_sw = VBUSIN_SWITCH_VBUSOUT;
>>>> break;
>>>> diff --git a/drivers/extcon/extcon.c b/drivers/extcon/extcon.c
>>>> index 8dd0af1d50bc..f345d492d4a1 100644
>>>> --- a/drivers/extcon/extcon.c
>>>> +++ b/drivers/extcon/extcon.c
>>>> @@ -39,37 +39,40 @@
>>>> #define CABLE_NAME_MAX 30
>>>>
>>>> static const char *extcon_name[] = {
>>>> - [EXTCON_NONE] = "NONE",
>>>> + [EXTCON_NONE] = "EXTCON_NONE",
>>>>
>>>> /* USB external connector */
>>>> - [EXTCON_USB] = "USB",
>>>> - [EXTCON_USB_HOST] = "USB-HOST",
>>>> -
>>>> - /* Charger external connector */
>>>> - [EXTCON_TA] = "TA",
>>>> - [EXTCON_FAST_CHARGER] = "FAST-CHARGER",
>>>> - [EXTCON_SLOW_CHARGER] = "SLOW-CHARGER",
>>>> - [EXTCON_CHARGE_DOWNSTREAM] = "CHARGE-DOWNSTREAM",
>>>> -
>>>> - /* Audio/Video external connector */
>>>> - [EXTCON_LINE_IN] = "LINE-IN",
>>>> - [EXTCON_LINE_OUT] = "LINE-OUT",
>>>> - [EXTCON_MICROPHONE] = "MICROPHONE",
>>>> - [EXTCON_HEADPHONE] = "HEADPHONE",
>>>> -
>>>> - [EXTCON_HDMI] = "HDMI",
>>>> - [EXTCON_MHL] = "MHL",
>>>> - [EXTCON_DVI] = "DVI",
>>>> - [EXTCON_VGA] = "VGA",
>>>> - [EXTCON_SPDIF_IN] = "SPDIF-IN",
>>>> - [EXTCON_SPDIF_OUT] = "SPDIF-OUT",
>>>> - [EXTCON_VIDEO_IN] = "VIDEO-IN",
>>>> - [EXTCON_VIDEO_OUT] = "VIDEO-OUT",
>>>> -
>>>> - /* Etc external connector */
>>>> - [EXTCON_DOCK] = "DOCK",
>>>> - [EXTCON_JIG] = "JIG",
>>>> - [EXTCON_MECHANICAL] = "MECHANICAL",
>>>> + [EXTCON_USB] = "EXTCON_USB",
>>>
>>> Should the name string be "USB-PERIPHERAL"?
>>
>> I think 'PERIPHERAL' is not necessary. The extcon name is
>> used for only end user using the platform developer.
>> 'PERIPHERAL' might cause the confusion to end user.
>>
> OK.
>>>
>>>> + [EXTCON_USB_HOST] = "EXTCON_USB_HOST",
>>>
>>> Why prefix EXTCON and change hyphen to underscore?
>>> Wasn't the original version i.e. "USB-HOST" better?
>>
>> Agreee.
>>
>>>
>>> Why the change in the name strings? Who is the end user of the name string?
>>> If the end use is just for information to a human user then the human readable
>>> format makes more sense. i.e. "MHL" or "MICROPHONE" makes more sense than
>>> "EXTCON_DISP_MHL" or "EXTCON_JACK_MICROPHONE"
>>
>> Your comment make sense. I'll not modify the name of external connector.
>> I'll use the existing name.
>>
>
> OK. Sorry for not pointing this out earlier.
No problem.
Thanks for your review.
Regards,
Chanwoo Choi
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