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Message-ID: <561F52B6.6020800@ti.com>
Date: Thu, 15 Oct 2015 10:16:06 +0300
From: Roger Quadros <rogerq@...com>
To: Chanwoo Choi <cw00.choi@...sung.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
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.
cheers,
-roger
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