linux-kernel - Re: [PATCH v4 1/2] mfd: intel_soc_pmic: Select designware i2c-bus driver

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Message-ID: <20170522105700.dyw7ade37z366nby@dell>
Date:   Mon, 22 May 2017 11:57:00 +0100
From:   Lee Jones <lee.jones@...aro.org>
To:     Hans de Goede <hdegoede@...hat.com>
Cc:     linux-kernel@...r.kernel.org,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH v4 1/2] mfd: intel_soc_pmic: Select designware i2c-bus
 driver

On Mon, 15 May 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>

Would be good to get an Ack by the users/maintainers of this driver.

> ---
> Note this patch will partially conflicts with (contains the same changes as)
> a patch in Andy Shevchenko's tree.

Has this been sorted now?

> ---
> 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
> Changes in v4:
> -Add explanation why this is a bool and why it selects i2c-designwaree
>  to the help text rather then as comments in the Kconfig
> ---
>  drivers/mfd/Kconfig | 11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
> index 1b6a83a4a114..61ebda81e134 100644
> --- a/drivers/mfd/Kconfig
> +++ b/drivers/mfd/Kconfig
> @@ -448,17 +448,24 @@ config LPC_SCH
>  
>  config INTEL_SOC_PMIC
>  	bool "Support for Crystal Cove PMIC"
> -	depends on GPIOLIB
> -	depends on I2C=y
> +	depends on HAS_IOMEM
> +	select GPIOLIB
> +	select I2C
>  	select MFD_CORE
>  	select REGMAP_I2C
>  	select REGMAP_IRQ
> +	select COMMON_CLK
> +	select I2C_DESIGNWARE_PLATFORM
>  	help
>  	  Select this option to enable support for Crystal Cove PMIC
>  	  on some Intel SoC systems. The PMIC provides ADC, GPIO,
>  	  thermal, charger and related power management functions
>  	  on these systems.
>  
> +	  This option is a bool as it provides an ACPI Opregion which must be

Nit: s/Opregion/OpRegion/

> +	  available before any devices using it are probed. This option also
> +	  causes the designware-i2c driver to be builtin for the same reason.
> +
>  config INTEL_SOC_PMIC_BXTWC
>  	tristate "Support for Intel Broxton Whiskey Cove PMIC"
>  	depends on INTEL_PMC_IPC

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