linux-kernel - Re: [PATCH v3 1/2] mfd: intel_soc_pmic: Select designware i2c-bus driver

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Date:   Mon, 24 Apr 2017 13:01:24 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] mfd: intel_soc_pmic: Select designware i2c-bus
 driver

On Fri, 21 Apr 2017, Hans de Goede wrote:

> The Crystal Cove PMIC provides an ACPI OPRegion handler, which must be
> available before other drivers using it are loaded, which is why
> INTEL_SOC_PMIC is a bool.
> 
> Just having the driver is not enough, the driver for the i2c-bus must
> also be built in, to ensure this, this patch adds a select for it.
> 
> This fixes errors like these during boot:
> 
> mmc0: SDHCI controller on ACPI [80860F14:00] using ADMA
> ACPI Error: No handler for Region [REGS] (ffff93543b0cc3a8) [UserDefinedRegion] (20170119/evregion-166)
> ACPI Error: Region UserDefinedRegion (ID=143) has no handler (20170119/exfldio-299)
> ACPI Error: Method parse/execution failed [\_SB.PCI0.I2C7.PMI5.GET] (Node ffff93543b0cde10), AE_NOT_EXIST (20170119/psparse-543)
> ACPI Error: Method parse/execution failed [\_SB.PCI0.SHC1._PS0] (Node ffff93543b0b5cd0), AE_NOT_EXIST (20170119/psparse-543)
> acpi 80860F14:02: Failed to change power state to D0
> 
> While at it this patch also changes the human readable name of the Kconfig
> option to make clear the INTEL_SOC_PMIC option selects support for the
> Intel Crystal Cove PMIC and documents why this is a bool.
> 
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Signed-off-by: Hans de Goede <hdegoede@...hat.com>
> ---
> Note this patch will partially conflicts with (contains the same changes as)
> a patch in Andy Shevchenko's tree.
> ---
> Changes in v2:
> -Fix Kconfig depends and selects to fix warning reported by kbuild test robot
> -Improve commit msg (add example of ACPI errors this avoids)
> Changes in v3:
> -No changes
> ---
>  drivers/mfd/Kconfig | 15 +++++++++++----
>  1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 2c34574..4eb044e 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -425,14 +425,21 @@ config LPC_SCH
>  	  System Management Bus and General Purpose I/O.
>  
>  config INTEL_SOC_PMIC
> -	bool "Support for Intel Atom SoC PMIC"
> -	depends on GPIOLIB
> -	depends on I2C=y
> +	# This is a bool as it provides an ACPI Opregion which must be
> +	# available as soon as possible
> +	bool "Support for Intel Crystal Cove PMIC"
> +	select GPIOLIB
>  	select MFD_CORE
>  	select REGMAP_I2C
>  	select REGMAP_IRQ
> +	# In order for the ACPI Opregion to be available the i2c-adapter
> +	# driver must be builtin too, select it and its deps

You can either write this up in the commit log or make a brief mention
to it in the 'help' section below, but please don't comment the
Kconfig this way, it's ugly as sin!

> +	depends on HAS_IOMEM
> +	select I2C
> +	select COMMON_CLK
> +	select I2C_DESIGNWARE_PLATFORM
>  	help
> -	  Select this option to enable support for the PMIC device
> +	  Select this option to enable support for the Crystal Cove PMIC
>  	  on some Intel SoC systems. The PMIC provides ADC, GPIO,
>  	  thermal, charger and related power management functions
>  	  on these systems.

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