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From: John Garry <john.garry@huawei.com>
To: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: <andriy.shevchenko@linux.intel.com>, <rjw@rjwysocki.net>,
	<linux-acpi@vger.kernel.org>, <lenb@kernel.org>,
	<lorenzo.pieralisi@arm.com>, <linux-kernel@vger.kernel.org>,
	<arnd@arndb.de>, <graeme.gregory@linaro.org>,
	<helgaas@kernel.org>, <linuxarm@huawei.com>,
	<z.liuxinliang@hisilicon.com>,
	"Liguozhu (Kenneth)" <liguozhu@hisilicon.com>,
	<lee.jones@linaro.org>
Subject: Re: [RFC PATCH 1/2] ACPI / PNP: Don't add "enumeration_by_parent" devices
Date: Fri, 27 Apr 2018 10:17:45 +0100	[thread overview]
Message-ID: <44e047a2-93e1-9eff-45b8-d538a7ae9092@huawei.com> (raw)
In-Reply-To: <15443a87-2622-01ee-f7f2-426a51ca0f11@huawei.com>

On 26/04/2018 15:23, John Garry wrote:

+

> On 26/04/2018 15:08, Mika Westerberg wrote:
>> On Thu, Apr 26, 2018 at 02:49:49PM +0100, John Garry wrote:
>>> diff --git a/drivers/bus/hisi_lpc.c b/drivers/bus/hisi_lpc.c
>>> index 2d4611e..b04425b 100644
>>> --- a/drivers/bus/hisi_lpc.c
>>> +++ b/drivers/bus/hisi_lpc.c
>>> @@ -18,6 +18,8 @@
>>>  #include <linux/of_platform.h>
>>>  #include <linux/pci.h>
>>>  #include <linux/slab.h>
>>> +#include <linux/serial_8250.h>
>>> +#include "../tty/serial/8250/8250.h"
>>>
>>>  #define DRV_NAME "hisi-lpc"
>>>
>>> @@ -345,6 +347,7 @@ static void hisi_lpc_comm_outs(void *hostdata,
>>> unsigned
>>> long pio,
>>>  #define MFD_CHILD_NAME_LEN (ACPI_ID_LEN +
>>> sizeof(MFD_CHILD_NAME_PREFIX) -
>>> 1)
>>>
>>>  struct hisi_lpc_mfd_cell {
>>> +    struct plat_serial8250_port serial8250_port;
>>>      struct mfd_cell_acpi_match acpi_match;
>>>      char name[MFD_CHILD_NAME_LEN];
>>>      char pnpid[ACPI_ID_LEN];
>>> @@ -513,10 +516,31 @@ static int hisi_lpc_acpi_probe(struct device
>>> *hostdev)
>>>          dev_warn(&child->dev, "set resource fail (%d)\n", ret);
>>>              return ret;
>>>          }
>>> +    if (!strcmp(acpi_device_hid(child), "HISI1031")) {
>>
>
> Hi Mika,
>
>> Hmm, there is a way in struct mfd_cell to match child devices using _HID
>> so is there something preventing you from using that?
>
> Not that I know about. Can you describe this method? I guess I also
> don't need to set the mfd_cell pnpid either for this special case device.
>

So we using the mfd_cell to match child devices using _HID. At a glance, 
I don't actually see other drivers to use mfd_cell_acpi_match.pnpid .

Anyway we don't use static tables as we need to update the resources of 
the cell dynamically. However I do look at a driver like 
intel_quark_i2c_gpio.c, and this dynamically modifies the value of 
global mfd_cell array here:
https://elixir.bootlin.com/linux/latest/source/drivers/mfd/intel_quark_i2c_gpio.c#L266

I know the cell array is only used at probe time, but this did not look 
to be good standard practice to me.

Thanks,
John

> Thanks,
> John
>
>
>>
>> .
>>
>

  parent reply	other threads:[~2018-04-27  9:18 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-20 10:07 [RFC PATCH 0/2] HISI LPC: Add PNP device support John Garry
2018-04-20 10:07 ` [RFC PATCH 1/2] ACPI / PNP: Don't add "enumeration_by_parent" devices John Garry
2018-04-20 13:07   ` Mika Westerberg
2018-04-20 13:24     ` John Garry
2018-04-20 13:52       ` Mika Westerberg
2018-04-20 14:09         ` John Garry
2018-04-26 13:49           ` John Garry
2018-04-26 14:08             ` Mika Westerberg
2018-04-26 14:23               ` John Garry
2018-04-26 14:40                 ` Mika Westerberg
2018-04-27  9:17                 ` John Garry [this message]
2018-04-30  5:36                   ` Lee Jones
2018-04-30  9:00                     ` John Garry
2018-04-30  9:26                       ` Lee Jones
2018-04-30  9:35                         ` John Garry
2018-04-30 10:46                           ` Lee Jones
2018-04-30 10:57                             ` John Garry
2018-04-20 10:07 ` [RFC PATCH 2/2] HISI LPC: Add PNP device support John Garry
2018-04-20 12:50   ` Andy Shevchenko
2018-04-20 13:09     ` John Garry
2018-04-20 13:28       ` Andy Shevchenko
2018-04-20 13:32         ` John Garry
2018-04-20 13:12   ` Mika Westerberg
2018-04-20 13:36     ` John Garry

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