linux-kernel - Re: [PATCH v3 2/4] watchdog: simatic-ipc-wdt: convert to use P2SB accessor

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Message-ID: <0d5d8502-fec7-fc91-0932-647f3e74e7e1@roeck-us.net>
Date:   Fri, 13 May 2022 06:01:54 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Henning Schild <henning.schild@...mens.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Mark Gross <markgross@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        linux-kernel@...r.kernel.org, linux-leds@...r.kernel.org,
        platform-driver-x86@...r.kernel.org,
        linux-watchdog@...r.kernel.org, Enrico Weigelt <lkml@...ux.net>,
        Gerd Haeussler <gerd.haeussler.ext@...mens.com>
Subject: Re: [PATCH v3 2/4] watchdog: simatic-ipc-wdt: convert to use P2SB
 accessor

On 5/13/22 01:36, Henning Schild wrote:
> Since we have a common P2SB accessor in tree we may use it instead of
> open coded variants.
> 
> Replace custom code by p2sb_bar() call.
> 
> Signed-off-by: Henning Schild <henning.schild@...mens.com>

Acked-by: Guenter Roeck <linux@...ck-us.net>

> ---
>   drivers/watchdog/Kconfig           |  1 +
>   drivers/watchdog/simatic-ipc-wdt.c | 15 ++++++++-------
>   2 files changed, 9 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index a7cd3ef5b3d8..0097fbb455ab 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -1639,6 +1639,7 @@ config SIEMENS_SIMATIC_IPC_WDT
>   	tristate "Siemens Simatic IPC Watchdog"
>   	depends on SIEMENS_SIMATIC_IPC
>   	select WATCHDOG_CORE
> +	select P2SB
>   	help
>   	  This driver adds support for several watchdogs found in Industrial
>   	  PCs from Siemens.
> diff --git a/drivers/watchdog/simatic-ipc-wdt.c b/drivers/watchdog/simatic-ipc-wdt.c
> index 8bac793c63fb..6599695dc672 100644
> --- a/drivers/watchdog/simatic-ipc-wdt.c
> +++ b/drivers/watchdog/simatic-ipc-wdt.c
> @@ -16,6 +16,7 @@
>   #include <linux/kernel.h>
>   #include <linux/module.h>
>   #include <linux/pci.h>
> +#include <linux/platform_data/x86/p2sb.h>
>   #include <linux/platform_data/x86/simatic-ipc-base.h>
>   #include <linux/platform_device.h>
>   #include <linux/sizes.h>
> @@ -54,9 +55,9 @@ static struct resource io_resource_trigger =
>   	DEFINE_RES_IO_NAMED(WD_TRIGGER_IOADR, SZ_1,
>   			    KBUILD_MODNAME " WD_TRIGGER_IOADR");
>   
> -/* the actual start will be discovered with pci, 0 is a placeholder */
> +/* the actual start will be discovered with p2sb, 0 is a placeholder */
>   static struct resource mem_resource =
> -	DEFINE_RES_MEM_NAMED(0, SZ_4, "WD_RESET_BASE_ADR");
> +	DEFINE_RES_MEM_NAMED(0, 0, "WD_RESET_BASE_ADR");
>   
>   static u32 wd_timeout_table[] = {2, 4, 6, 8, 16, 32, 48, 64 };
>   static void __iomem *wd_reset_base_addr;
> @@ -150,6 +151,7 @@ static int simatic_ipc_wdt_probe(struct platform_device *pdev)
>   	struct simatic_ipc_platform *plat = pdev->dev.platform_data;
>   	struct device *dev = &pdev->dev;
>   	struct resource *res;
> +	int ret;
>   
>   	switch (plat->devmode) {
>   	case SIMATIC_IPC_DEVICE_227E:
> @@ -190,15 +192,14 @@ static int simatic_ipc_wdt_probe(struct platform_device *pdev)
>   	if (plat->devmode == SIMATIC_IPC_DEVICE_427E) {
>   		res = &mem_resource;
>   
> -		/* get GPIO base from PCI */
> -		res->start = simatic_ipc_get_membase0(PCI_DEVFN(0x1f, 1));
> -		if (res->start == 0)
> -			return -ENODEV;
> +		ret = p2sb_bar(NULL, 0, res);
> +		if (ret)
> +			return ret;
>   
>   		/* do the final address calculation */
>   		res->start = res->start + (GPIO_COMMUNITY0_PORT_ID << 16) +
>   			     PAD_CFG_DW0_GPP_A_23;
> -		res->end += res->start;
> +		res->end = res->start + SZ_4 - 1;
>   
>   		wd_reset_base_addr = devm_ioremap_resource(dev, res);
>   		if (IS_ERR(wd_reset_base_addr))