Re: [PATCH 2/3 V2] acpi:apd:add AMD ACPI2Platform device support

[Mika Westerberg <mika.westerberg@linux.intel.com>]

On Thu, Dec 11, 2014 at 11:05:33AM +0800, Ken Xue wrote:
> This is a new feature to interpret AMD specific ACPI device to
> platform device such as I2C, UART found on AMD CZ and later
> chipsets. It based on acpi soc.
> 
> Signed-off-by: Ken Xue <Ken.Xue@amd.com>

This looks good to me. One style problem found below.

> ---
>  arch/x86/Kconfig        | 11 ++++++++
>  drivers/acpi/Makefile   |  2 +-
>  drivers/acpi/acpi_apd.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++
>  drivers/acpi/internal.h |  2 ++
>  drivers/acpi/scan.c     |  1 +
>  5 files changed, 86 insertions(+), 1 deletion(-)
>  create mode 100644 drivers/acpi/acpi_apd.c
> 
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index ded8a67..030f508 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -495,6 +495,17 @@ config X86_INTEL_LPSS
>  	  things like clock tree (common clock framework) and pincontrol
>  	  which are needed by the LPSS peripheral drivers.
>  
> +config X86_AMD_PLATFORM_DEVICE
> +	bool "AMD ACPI2Platform devices support"
> +	depends on ACPI
> +	select COMMON_CLK
> +	select PINCTRL
> +	---help---
> +	  Select to interpret AMD specific ACPI device to platform device
> +	  such as I2C, UART found on AMD Carrizo and later chipsets. Selecting
> +	  this option enables things like clock tree (common clock framework)
> +	  and pinctrl.
> +
>  config IOSF_MBI
>  	tristate "Intel SoC IOSF Sideband support for SoC platforms"
>  	depends on PCI
> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
> index ae3397d..b07003a 100644
> --- a/drivers/acpi/Makefile
> +++ b/drivers/acpi/Makefile
> @@ -40,7 +40,7 @@ acpi-$(CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC) += processor_pdc.o
>  acpi-y				+= ec.o
>  acpi-$(CONFIG_ACPI_DOCK)	+= dock.o
>  acpi-y				+= pci_root.o pci_link.o pci_irq.o
> -acpi-y				+= acpi_soc.o acpi_lpss.o
> +acpi-y				+= acpi_soc.o acpi_lpss.o acpi_apd.o
>  acpi-y				+= acpi_platform.o
>  acpi-y				+= acpi_pnp.o
>  acpi-y				+= int340x_thermal.o
> diff --git a/drivers/acpi/acpi_apd.c b/drivers/acpi/acpi_apd.c
> new file mode 100644
> index 0000000..b46e2af
> --- /dev/null
> +++ b/drivers/acpi/acpi_apd.c
> @@ -0,0 +1,71 @@
> +/*
> + * AMD ACPI support for  ACPI2platform device.
                          ^^ doubled space

> + *
> + * Copyright (c) 2014, AMD Corporation.
> + * Authors: Ken Xue <Ken.Xue@amd.com>
> + *	Wu, Jeff <Jeff.Wu@amd.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +#include <linux/clkdev.h>
> +#include <linux/clk-provider.h>
> +#include <linux/err.h>
> +
> +#include "acpi_soc.h"
> +#include "internal.h"
> +
> +static struct acpi_soc a_soc;
> +
> +#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
> +#define APD_ADDR(desc)	((unsigned long)&desc)
> +
> +static int acpi_apd_setup(struct acpi_soc_dev_private_data *pdata)
> +{
> +	struct acpi_soc_dev_desc *dev_desc = pdata->dev_desc;
> +	struct clk *clk = ERR_PTR(-ENODEV);
> +
> +	if (dev_desc->fixed_clk_rate) {
> +		clk = clk_register_fixed_rate(&pdata->adev->dev,
> +					dev_name(&pdata->adev->dev),
> +					NULL, CLK_IS_ROOT,
> +					dev_desc->fixed_clk_rate);
> +		clk_register_clkdev(clk, NULL, dev_name(&pdata->adev->dev));
> +	}
> +
> +	return 0;
> +}
> +
> +static struct acpi_soc_dev_desc cz_i2c_desc = {
> +	.setup = acpi_apd_setup,
> +	.fixed_clk_rate = 133000000,
> +};
> +
> +static struct acpi_soc_dev_desc cz_uart_desc = {
> +	.setup = acpi_apd_setup,
> +	.fixed_clk_rate = 48000000,
> +};
> +
> +#else
> +
> +#define APD_ADDR(desc) (0UL)
> +
> +#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
> +
> +static struct acpi_device_id acpi_apd_device_ids[] = {
> +	/* Generic apd devices */
> +	{ "AMD0010", APD_ADDR(cz_i2c_desc) },
> +	{ "AMD0020", APD_ADDR(cz_uart_desc) },
> +	{ }
> +};
> +
> +void __init acpi_apd_init(void)
> +{
> +	a_soc.ids = acpi_apd_device_ids;
> +#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
> +	register_acpi_soc(&a_soc, false);
> +#else
> +	register_acpi_soc(&a_soc, true);
> +#endif /* CONFIG_X86_AMD_PLATFORM_DEVICE */
> +}
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index 447f6d6..bade825 100644
> --- a/drivers/acpi/internal.h
> +++ b/drivers/acpi/internal.h
> @@ -68,6 +68,8 @@ static inline void acpi_debugfs_init(void) { return; }
>  #endif
>  void acpi_lpss_init(void);
>  
> +void acpi_apd_init(void);
> +
>  acpi_status acpi_hotplug_schedule(struct acpi_device *adev, u32 src);
>  bool acpi_queue_hotplug_work(struct work_struct *work);
>  void acpi_device_hotplug(struct acpi_device *adev, u32 src);
> diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
> index 0476e90..24fef2b 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -2349,6 +2349,7 @@ int __init acpi_scan_init(void)
>  	acpi_pci_link_init();
>  	acpi_processor_init();
>  	acpi_lpss_init();
> +	acpi_apd_init();
>  	acpi_cmos_rtc_init();
>  	acpi_container_init();
>  	acpi_memory_hotplug_init();
> -- 
> 1.9.1