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Date: Tue, 3 Feb 2015 12:06:06 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Ken Xue <Ken.Xue@....com>
Cc: "Rafael J. Wysocki" <rjw@...ysocki.net>,
"mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3] acpi:apd:add AMD ACPI2Platform device support for x86 system.
On Tue, Feb 3, 2015 at 3:54 AM, Ken Xue <Ken.Xue@....com> wrote:
> This new feature is to interpret AMD specific ACPI device to
> platform device such as I2C, UART found on AMD CZ and later chipsets. It
> based on example intel LPSS. Now, it can support AMD I2C & UART.
>
Few minor things below.
Be free to fix in depend on what Mika and Rafael confirm.
Anyway,
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
> Signed-off-by: Ken Xue <Ken.Xue@....com>
> ---
> arch/x86/Kconfig | 11 +++
> drivers/acpi/Makefile | 2 +-
> drivers/acpi/acpi_apd.c | 201 ++++++++++++++++++++++++++++++++++++++++++++++++
> drivers/acpi/internal.h | 2 +
> drivers/acpi/scan.c | 1 +
> 5 files changed, 216 insertions(+), 1 deletion(-)
> create mode 100644 drivers/acpi/acpi_apd.c
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 0dc9d01..ddf8d42 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -496,6 +496,17 @@ 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.
Sounds 'like' is redundant here. It explicitly enables common clock
and pin control frameworks.
> +
> 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 f74317c..0071141 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_lpss.o
> +acpi-y += 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..b27bc1c
> --- /dev/null
> +++ b/drivers/acpi/acpi_apd.c
> @@ -0,0 +1,201 @@
> +/*
> + * AMD ACPI support for ACPI2platform device.
> + *
> + * Copyright (c) 2014,2015 AMD Corporation.
> + * Authors: Ken Xue <Ken.Xue@....com>
> + * Wu, Jeff <Jeff.Wu@....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/clk-provider.h>
> +#include <linux/platform_device.h>
> +#include <linux/pm_domain.h>
> +#include <linux/clkdev.h>
> +#include <linux/acpi.h>
> +#include <linux/err.h>
> +#include <linux/clk.h>
> +#include <linux/pm.h>
> +
> +#include "internal.h"
> +
> +ACPI_MODULE_NAME("acpi_apd");
> +struct apd_private_data;
> +
> +/**
/*, or use description on per flag basis.
> + * device flags of acpi_apd_dev_desc.
> + * ACPI_APD_SYSFS : add device attributes in sysfs
> + * ACPI_APD_PM : attach power domain to device
> + * ACPI_APD_PM_ON : power on device when attach power domain
> + */
> +#define ACPI_APD_SYSFS BIT(0)
> +#define ACPI_APD_PM BIT(1)
> +#define ACPI_APD_PM_ON BIT(2)
> +
> +/**
> + * struct apd_device_desc - a descriptor for apd device
> + * @flags: device flags like ACPI_APD_SYSFS ACPI_APD_PM ACPI_APD_PM_ON
%ACPI_APD_SYSFS, %ACPI_APD_PM, %ACPI_APD_APM_ON.
Could it be combination? State this explicitly.
> + * @fixed_clk_rate: fixed rate input clock source for acpi device;
> + * 0 means no fixed rate input clock source
> + * @setup: a hook routine to set device resource during create platform device
> + *
> + * device description defined as acpi_device_id.driver_data
d -> D
> + */
> +struct apd_device_desc {
> + unsigned int flags;
> + unsigned int fixed_clk_rate;
> + int (*setup)(struct apd_private_data *pdata);
> +};
> +
> +struct apd_private_data {
> + struct clk *clk;
> + struct acpi_device *adev;
> + const struct apd_device_desc *dev_desc;
> +};
> +
> +#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
> +#define APD_ADDR(desc) ((unsigned long)&desc)
> +
> +static int acpi_apd_setup(struct apd_private_data *pdata)
> +{
> + const struct apd_device_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));
> + pdata->clk = clk;
> + }
What about
if (!…clk_rate)
return 0;
…
return 0; ?
And question why we need int to be returned at all?
> +
> + return 0;
> +}
> +
> +static struct apd_device_desc cz_i2c_desc = {
> + .setup = acpi_apd_setup,
> + .fixed_clk_rate = 133000000,
> +};
> +
> +static struct apd_device_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 int acpi_apd_create_device(struct acpi_device *adev,
> + const struct acpi_device_id *id)
> +{
> + const struct apd_device_desc *dev_desc;
> + struct apd_private_data *pdata;
> + struct platform_device *pdev;
> + int ret;
> +
> + dev_desc = (struct apd_device_desc *)id->driver_data;
You may move this assignment to the definition block. And if it
doesn't fit one line you may cast to (void *), though I don't know if
Rafael likes such trick.
> + if (!dev_desc) {
> + pdev = acpi_create_platform_device(adev);
> + return IS_ERR_OR_NULL(pdev) ? PTR_ERR(pdev) : 1;
I guess it worth to add a comment what means return code here.
> + }
> + pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
> + if (!pdata)
> + return -ENOMEM;
> +
> + pdata->adev = adev;
> + pdata->dev_desc = dev_desc;
> +
> + if (dev_desc->setup) {
> + ret = dev_desc->setup(pdata);
> + if (ret)
> + goto err_out;
> + }
> +
> + adev->driver_data = pdata;
> + pdev = acpi_create_platform_device(adev);
> + if (!IS_ERR_OR_NULL(pdev))
> + return 1;
> +
> + ret = PTR_ERR(pdev);
> + adev->driver_data = NULL;
> +
> + err_out:
> + kfree(pdata);
> + return ret;
> +}
> +
> +static const struct acpi_device_id acpi_apd_device_ids[] = {
> + /* Generic apd devices */
> + { "AMD0010", APD_ADDR(cz_i2c_desc) },
> + { "AMD0020", APD_ADDR(cz_uart_desc) },
> + { }
> +};
> +
> +#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
> +static int acpi_apd_platform_notify(struct notifier_block *nb,
> + unsigned long action, void *data)
> +{
> + struct platform_device *pdev = to_platform_device(data);
> + const struct acpi_device_id *id = NULL;
Redundant assignment.
> + struct apd_private_data *pdata;
> + struct acpi_device *adev;
> + bool power_on;
> + int ret;
> +
> + id = acpi_match_device(acpi_apd_device_ids, &pdev->dev);
> + if (!id || !id->driver_data)
> + return 0;
> +
> + if (acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
Better of course to do like
status = …
if (status) [don't remember how to check status with ACPI API]
return 0;
> + return 0;
> +
> + pdata = acpi_driver_data(adev);
> + if (!pdata || !pdata->dev_desc)
> + return 0;
> +
> + switch (action) {
> + case BUS_NOTIFY_ADD_DEVICE:
> + if (pdata->dev_desc->flags & ACPI_APD_PM) {
> + power_on = !!(pdata->dev_desc->flags & ACPI_APD_PM_ON);
> + ret = dev_pm_domain_attach(&pdev->dev, power_on);
> +
> + if (ret)
> + dev_dbg(&pdev->dev,
> + "failed to attached pm domain (%d)\n", ret);
> + }
> + break;
> + case BUS_NOTIFY_DEL_DEVICE:
> + if (pdata->dev_desc->flags & ACPI_APD_PM) {
> + power_on = !!(pdata->dev_desc->flags & ACPI_APD_PM_ON);
> + dev_pm_domain_detach(&pdev->dev, power_on);
> + }
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static struct notifier_block acpi_apd_nb = {
> + .notifier_call = acpi_apd_platform_notify,
> +};
> +#endif
> +
> +static struct acpi_scan_handler apd_handler = {
> + .ids = acpi_apd_device_ids,
> + .attach = acpi_apd_create_device,
> +};
> +
> +void __init acpi_apd_init(void)
> +{
> +#ifdef CONFIG_X86_AMD_PLATFORM_DEVICE
> + bus_register_notifier(&platform_bus_type, &acpi_apd_nb);
> +#endif
> +
> + acpi_scan_add_handler(&apd_handler);
> +}
> diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h
> index 163e82f..c24ae9d 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 dc4d896..bbca783 100644
> --- a/drivers/acpi/scan.c
> +++ b/drivers/acpi/scan.c
> @@ -2544,6 +2544,7 @@ 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
>
>
>
--
With Best Regards,
Andy Shevchenko
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