[PATCH] Input: touchscreen: fix kconfig dependency bug for TOUCHSCREEN_ADC

[PATCH] Input: touchscreen: fix kconfig dependency bug for TOUCHSCREEN_ADC

[Necip Fazil Yildiran]

When TOUCHSCREEN_ADC is enabled and IIO_BUFFER is disabled, it results
in the following Kbuild warning:

WARNING: unmet direct dependencies detected for IIO_BUFFER_CB
  Depends on [n]: IIO [=y] && IIO_BUFFER [=n]
  Selected by [y]:
  - TOUCHSCREEN_ADC [=y] && !UML && INPUT [=y] && INPUT_TOUCHSCREEN [=y] && IIO [=y]

The reason is that TOUCHSCREEN_ADC selects IIO_BUFFER_CB without depending
on or selecting IIO_BUFFER while IIO_BUFFER_CB depends on IIO_BUFFER. This
can also fail building the kernel.

Honor the kconfig dependency to remove unmet direct dependency warnings
and avoid any potential build failures.

Fixes: aa132ffb6b0a ("input: touchscreen: resistive-adc-touch: add generic resistive ADC touchscreen")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=209881
Signed-off-by: Necip Fazil Yildiran <fazilyildiran@gmail.com>
---
 drivers/input/touchscreen/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index f012fe746df0..cc18f54ea887 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -96,6 +96,7 @@ config TOUCHSCREEN_AD7879_SPI
 config TOUCHSCREEN_ADC
 	tristate "Generic ADC based resistive touchscreen"
 	depends on IIO
+	select IIO_BUFFER
 	select IIO_BUFFER_CB
 	help
 	  Say Y here if you want to use the generic ADC
-- 
2.25.1

Re: [PATCH] Input: touchscreen: fix kconfig dependency bug for TOUCHSCREEN_ADC

[Jonathan Cameron]

On Tue, 3 Nov 2020 01:15:05 +0300
Necip Fazil Yildiran <fazilyildiran@gmail.com> wrote:

> When TOUCHSCREEN_ADC is enabled and IIO_BUFFER is disabled, it results
> in the following Kbuild warning:
> 
> WARNING: unmet direct dependencies detected for IIO_BUFFER_CB
>   Depends on [n]: IIO [=y] && IIO_BUFFER [=n]
>   Selected by [y]:
>   - TOUCHSCREEN_ADC [=y] && !UML && INPUT [=y] && INPUT_TOUCHSCREEN [=y] && IIO [=y]
> 
> The reason is that TOUCHSCREEN_ADC selects IIO_BUFFER_CB without depending
> on or selecting IIO_BUFFER while IIO_BUFFER_CB depends on IIO_BUFFER. This
> can also fail building the kernel.
> 
> Honor the kconfig dependency to remove unmet direct dependency warnings
> and avoid any potential build failures.
> 
> Fixes: aa132ffb6b0a ("input: touchscreen: resistive-adc-touch: add generic resistive ADC touchscreen")
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=209881
> Signed-off-by: Necip Fazil Yildiran <fazilyildiran@gmail.com>

Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  drivers/input/touchscreen/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
> index f012fe746df0..cc18f54ea887 100644
> --- a/drivers/input/touchscreen/Kconfig
> +++ b/drivers/input/touchscreen/Kconfig
> @@ -96,6 +96,7 @@ config TOUCHSCREEN_AD7879_SPI
>  config TOUCHSCREEN_ADC
>  	tristate "Generic ADC based resistive touchscreen"
>  	depends on IIO
> +	select IIO_BUFFER
>  	select IIO_BUFFER_CB
>  	help
>  	  Say Y here if you want to use the generic ADC

Re: [PATCH] Input: touchscreen: fix kconfig dependency bug for TOUCHSCREEN_ADC

[Dmitry Torokhov]

On Tue, Nov 03, 2020 at 01:15:05AM +0300, Necip Fazil Yildiran wrote:
> When TOUCHSCREEN_ADC is enabled and IIO_BUFFER is disabled, it results
> in the following Kbuild warning:
> 
> WARNING: unmet direct dependencies detected for IIO_BUFFER_CB
>   Depends on [n]: IIO [=y] && IIO_BUFFER [=n]
>   Selected by [y]:
>   - TOUCHSCREEN_ADC [=y] && !UML && INPUT [=y] && INPUT_TOUCHSCREEN [=y] && IIO [=y]
> 
> The reason is that TOUCHSCREEN_ADC selects IIO_BUFFER_CB without depending
> on or selecting IIO_BUFFER while IIO_BUFFER_CB depends on IIO_BUFFER. This
> can also fail building the kernel.
> 
> Honor the kconfig dependency to remove unmet direct dependency warnings
> and avoid any potential build failures.
> 
> Fixes: aa132ffb6b0a ("input: touchscreen: resistive-adc-touch: add generic resistive ADC touchscreen")
> Link: https://bugzilla.kernel.org/show_bug.cgi?id=209881
> Signed-off-by: Necip Fazil Yildiran <fazilyildiran@gmail.com>

Applied, thank you.

-- 
Dmitry