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Date: Wed, 4 Feb 2015 11:40:34 +0800
From: Ken Xue <Ken.Xue@....com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
CC: Andy Shevchenko <andy.shevchenko@...il.com>,
"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, 2015-02-03 at 23:07 +0100, Rafael J. Wysocki wrote:
> On Tuesday, February 03, 2015 12:06:06 PM Andy Shevchenko wrote:
> > 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>
>
> Thanks Andy!
>
> Ken, please address the Andy's comments given below, they all make sense to me.
>
Thanks for all your comments.
> > > 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.
> >
I just copy the last sentence from description of X86_INTEL_LPSS. but it
is OK, i will remove it from next release.
> > > +
> > > 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.
> >
OK.
> > > + * 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.
> >
OK.
> > > + * @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
> >
OK.
> > > + */
> > > +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;
> > …
OK.
> > return 0; ?
> >
> > And question why we need int to be returned at all?
> >
It just provides a possibility to return error. In current use case,
there is no need to return. But i believe it is better to reserve this
design.
>
> > > +
> > > + 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.
> >
OK.
> > > + 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.
> >
OK.
> > > + }
> > > + 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.
> >
OK.
> > > + 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;
> >
I use same coding style as LPSS and other examples in current kernel.
I don't think it is really need to be changed.
> > > + 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
> > >
> > >
> > >
> >
> >
> >
> >
>
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