linux-kernel - Re: [RFC PATCH 1/2] ACPI / PNP: Don't add "enumeration_by

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Message-ID: <20180426140808.GK2173@lahna.fi.intel.com>
Date:   Thu, 26 Apr 2018 17:08:08 +0300
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     John Garry <john.garry@...wei.com>
Cc:     andriy.shevchenko@...ux.intel.com, rjw@...ysocki.net,
        linux-acpi@...r.kernel.org, lenb@...nel.org,
        lorenzo.pieralisi@....com, linux-kernel@...r.kernel.org,
        arnd@...db.de, graeme.gregory@...aro.org, helgaas@...nel.org,
        linuxarm@...wei.com, z.liuxinliang@...ilicon.com,
        "Liguozhu (Kenneth)" <liguozhu@...ilicon.com>
Subject: Re: [RFC PATCH 1/2] ACPI / PNP: Don't add "enumeration_by_parent"
 devices

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")) {

Hmm, there is a way in struct mfd_cell to match child devices using _HID
so is there something preventing you from using that?