linux-kernel - Re: [PATCH v7 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD

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Date:   Wed, 26 Oct 2016 13:44:47 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Ksenija Stanojevic <ksenija.stanojevic@...il.com>
Cc:     linux-kernel@...r.kernel.org, dmitry.torokhov@...il.com,
        linux-input@...r.kernel.org, jic23@...nel.org, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, marex@...x.de,
        linux-iio@...r.kernel.org, harald@...ib.org,
        stefan.wahren@...e.com, fabio.estevam@...escale.com
Subject: Re: [PATCH v7 1/5] mfd: mxs-lradc: Add support for mxs-lradc MFD

On Sun, 02 Oct 2016, Ksenija Stanojevic wrote:

> Add core files for mxs-lradc MFD driver.

Please elaborate as to what mxs-lradc is.

> Note:  this patch won't compile in iio/testing without this patch:
> a8f447be8056 ("mfd: Add resource managed APIs for mfd_add_devices")

Which has been in the kernel since v4.6, so you don't need to mention
it anymore.

> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@...il.com>
> ---
> Changes in v7:
>  - define macros ADC_CELL and TSC_CELL
>  - remove one cell and dynamically set them in the switch()
>  - fail in the touchscreen driver instead of mfd driver if 
>    hardware doesn't contain a touchscreen
> 
> Changes in v6:
>  - update copyright
>  - add kernel-doc header for struct mxs-lradc
>  - add error message
>  - change EINVAL to ENODEV
>  - use PLATFORM_DEVID_NONE instead -1
>  - cosmetic fixes
> 
> Changes in v5:
>  - use DEFINE_RES_MEM
>  - don't pass ioreammaped adress to platform cells
>  - move comment outside of struct mxs_lradc
>  - change type of argument in mxs_lradc_reg_set, mxs_lradc_reg_clear,
>    mxs_lradc_reg_wrt (struct mxs_lradc * -> void __iomem *)
> 
> Changes in v4:
>  - update copyright
>  - use DEFINE_RES_IRQ_NAMED
>  - remove mxs_lradc_add_device function
>  - use struct mfd_cell in static form
>  - improve spacing
>  - remove unnecessary comment
>  - remove platform_get_irq
>  - remove touch_ret and use ret instead
>  - rename use_touchscreen to touchscreen_wire
>  - use goto statements
>  - remove irq[13], irq_count and irq_name from struct mxs_lradc
>  - remove all defines from inside the struct definition
> 
> Changes in v3:
>  - add note to commit message
>  - move switch statement into if(touch_ret == 0) branch
>  - add MODULE_AUTHOR
> 
> Changes in v2:
>  - do not change spacing in Kconfig
>  - make struct mfd_cell part of struct mxs_lradc
>  - use switch instead of if in mxs_lradc_irq_mask
>  - use only necessary header files in mxs_lradc.h
>  - use devm_mfd_add_device
>  - use separate function to register mfd device
>  - change licence to GPL
>  - add copyright
> 
>  drivers/mfd/Kconfig  | 17 +++++++++++++++++
>  drivers/mfd/Makefile |  1 +
>  2 files changed, 18 insertions(+)
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 2d1fb64..188c7d1 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -308,6 +308,23 @@ config MFD_MC13XXX_I2C
>  	help
>  	  Select this if your MC13xxx is connected via an I2C bus.
>  
> +config MFD_MXS_LRADC
> +	tristate "Freescale i.MX23/i.MX28 LRADC"
> +	depends on ARCH_MXS || COMPILE_TEST
> +	select MFD_CORE
> +	select STMP_DEVICE
> +	help
> +	  Say yes here to build support for the Low Resolution
> +	  Analog-to-Digital Converter (LRADC) found on the i.MX23 and i.MX28
> +	  processors. This driver provides common support for accessing the
> +	  device, additional drivers must be enabled in order to use the
> +	  functionality of the device:
> +		mxs-lradc-adc for ADC readings
> +		mxs-lradc-ts  for touchscreen support
> +
> +	  This driver can also be built as a module. If so, the module will be
> +	  called mxs-lradc.
> +
>  config MFD_MX25_TSADC
>  	tristate "Freescale i.MX25 integrated Touchscreen and ADC unit"
>  	select REGMAP_MMIO
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 2ba3ba3..c9f9c80 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -207,3 +207,4 @@ obj-$(CONFIG_INTEL_SOC_PMIC)	+= intel-soc-pmic.o
>  obj-$(CONFIG_MFD_MT6397)	+= mt6397-core.o
>  
>  obj-$(CONFIG_MFD_ALTERA_A10SR)	+= altera-a10sr.o
> +obj-$(CONFIG_MFD_MXS_LRADC)     += mxs-lradc.o

Please add these in the same patch that you add the driver.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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