linux-kernel - Re: [PATCH AUTOSEL 6.8 78/98] input/touchscreen: imagis: add support for IST3032C

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Date: Sun, 7 Apr 2024 19:48:45 -0400
From: Sasha Levin <sashal@...nel.org>
To: Karel Balej <balejk@...fyz.cz>
Cc: Markuss Broks <markuss.broks@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-input@...r.kernel.org, duje.mihanovic@...le.hr,
	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH AUTOSEL 6.8 78/98] input/touchscreen: imagis: add support
 for IST3032C

On Sat, Mar 30, 2024 at 10:33:53AM +0100, Karel Balej wrote:
>Sasha,
>
>Sasha Levin, 2024-03-29T08:37:49-04:00:
>> From: Karel Balej <balejk@...fyz.cz>
>>
>> [ Upstream commit 90cb57a6c5717b83a110c0da720a03ee32ed255e ]
>>
>> IST3032C is a touchscreen chip used for instance in the
>> samsung,coreprimevelte smartphone, with which this was tested. Add the
>> chip specific information to the driver.
>>
>> Reviewed-by: Markuss Broks <markuss.broks@...il.com>
>> Signed-off-by: Karel Balej <balejk@...fyz.cz>
>> Link: https://lore.kernel.org/r/20240301164659.13240-6-karelb@gimli.ms.mff.cuni.cz
>> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@...il.com>
>> Signed-off-by: Sasha Levin <sashal@...nel.org>
>> ---
>>  drivers/input/touchscreen/imagis.c | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>>
>> diff --git a/drivers/input/touchscreen/imagis.c b/drivers/input/touchscreen/imagis.c
>> index 9af8a6332ae67..e1fafa561ee38 100644
>> --- a/drivers/input/touchscreen/imagis.c
>> +++ b/drivers/input/touchscreen/imagis.c
>> @@ -11,6 +11,8 @@
>>  #include <linux/property.h>
>>  #include <linux/regulator/consumer.h>
>>
>> +#define IST3032C_WHOAMI			0x32c
>> +
>>  #define IST3038B_REG_STATUS		0x20
>>  #define IST3038B_REG_CHIPID		0x30
>>  #define IST3038B_WHOAMI			0x30380b
>> @@ -363,6 +365,13 @@ static int imagis_resume(struct device *dev)
>>
>>  static DEFINE_SIMPLE_DEV_PM_OPS(imagis_pm_ops, imagis_suspend, imagis_resume);
>>
>> +static const struct imagis_properties imagis_3032c_data = {
>> +	.interrupt_msg_cmd = IST3038C_REG_INTR_MESSAGE,
>> +	.touch_coord_cmd = IST3038C_REG_TOUCH_COORD,
>> +	.whoami_cmd = IST3038C_REG_CHIPID,
>> +	.whoami_val = IST3032C_WHOAMI,
>> +};
>> +
>>  static const struct imagis_properties imagis_3038b_data = {
>>  	.interrupt_msg_cmd = IST3038B_REG_STATUS,
>>  	.touch_coord_cmd = IST3038B_REG_STATUS,
>> @@ -380,6 +389,7 @@ static const struct imagis_properties imagis_3038c_data = {
>>
>>  #ifdef CONFIG_OF
>>  static const struct of_device_id imagis_of_match[] = {
>> +	{ .compatible = "imagis,ist3032c", .data = &imagis_3032c_data },
>>  	{ .compatible = "imagis,ist3038b", .data = &imagis_3038b_data },
>>  	{ .compatible = "imagis,ist3038c", .data = &imagis_3038c_data },
>>  	{ },
>> --
>> 2.43.0
>
>sorry if I'm missing something, but I don't see why this should be
>backported: it doesn't fix anything, it's just adding support for new
>hardware.
>
>I can see that adding a device ID is permitted for -stable [1], but I
>thought it still has to bear some signs of a fix, such as maybe here
>[2].

It does not need to be a fix, it could just be plain device enablement.

-- 
Thanks,
Sasha