linux-kernel - Re: [PATCH V2 08/10] watchdog: da9062/61: watchdog driver

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Date:   Wed, 26 Oct 2016 11:59:26 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Steve Twiss <stwiss.opensource@...semi.com>
Cc:     LINUX-KERNEL <linux-kernel@...r.kernel.org>,
        LINUX-WATCHDOG <linux-watchdog@...r.kernel.org>,
        Wim Van Sebroeck <wim@...ana.be>,
        DEVICETREE <devicetree@...r.kernel.org>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Eduardo Valentin <edubezval@...il.com>,
        LINUX-INPUT <linux-input@...r.kernel.org>,
        LINUX-PM <linux-pm@...r.kernel.org>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Support Opensource <support.opensource@...semi.com>,
        Zhang Rui <rui.zhang@...el.com>
Subject: Re: [PATCH V2 08/10] watchdog: da9062/61: watchdog driver

On Wed, Oct 26, 2016 at 05:56:39PM +0100, Steve Twiss wrote:
> From: Steve Twiss <stwiss.opensource@...semi.com>
> 
> The of_device_id match array is added to support "dlg,da9062-watchdog"
> as a valid .compatible string.
> 
> The watchdog_info structure is linked to this device tree compatible
> string in the .data section. Extra code is added into the probe function to
> search-for and assign this match data.
> 
> This patch now assumes the use of a DA9062 fallback compatible string for
> the DTS to pick up the DA9062 device driver for use with the DA9061
> watchdog hardware.
> 
> Copyright header is updated to add DA9061 in its description and the module
> description macro is extended to include DA9061.
> 
> Kconfig is updated to reflect support for DA9061/62.
> 
> Signed-off-by: Steve Twiss <stwiss.opensource@...semi.com>
> 
> ---
> This patch applies against linux-next and v4.8
> 
> v1 -> v2
>  - Patch renamed from [PATCH V1 04/10] to [PATCH V2 08/10] -- these
>    changes were made to fix checkpatch warnings caused by the patch
>    set dependency order
>  - Removal of the DA9061 compatible entries for this device driver.
>  - Additional explanation in the patch description for the use of a
>    fall-back compatible DTS string
> 
> Guenter,
> 
> Alterations have been made in accordance with the previous e-mail thread
> on the use of compatible strings: https://lkml.org/lkml/2016/10/7/641
> This patch now assumes the use of a fallback compatible string in the DTS.
> Of the form: compatible = "dlg,da9061-watchdog", "dlg,da9062-watchdog";
> 
> Regards,
> Steve Twiss, Dialog Semiconductor Ltd.
> 
> 
>  drivers/watchdog/Kconfig      |  4 ++--
>  drivers/watchdog/da9062_wdt.c | 18 +++++++++++++++---
>  2 files changed, 17 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/watchdog/Kconfig b/drivers/watchdog/Kconfig
> index 1bffe00..d6b4088 100644
> --- a/drivers/watchdog/Kconfig
> +++ b/drivers/watchdog/Kconfig
> @@ -104,11 +104,11 @@ config DA9063_WATCHDOG
>  	  This driver can be built as a module. The module name is da9063_wdt.
>  
>  config DA9062_WATCHDOG
> -	tristate "Dialog DA9062 Watchdog"
> +	tristate "Dialog DA9062/61 Watchdog"
>  	depends on MFD_DA9062
>  	select WATCHDOG_CORE
>  	help
> -	  Support for the watchdog in the DA9062 PMIC.
> +	  Support for the watchdog in the DA9062 and DA9061 PMICs.
>  
>  	  This driver can be built as a module. The module name is da9062_wdt.
>  
> diff --git a/drivers/watchdog/da9062_wdt.c b/drivers/watchdog/da9062_wdt.c
> index 7386111..4b20b7a 100644
> --- a/drivers/watchdog/da9062_wdt.c
> +++ b/drivers/watchdog/da9062_wdt.c
> @@ -1,5 +1,5 @@
>  /*
> - * da9062_wdt.c - WDT device driver for DA9062
> + * Watchdog device driver for DA9062 and DA9061 PMICs
>   * Copyright (C) 2015  Dialog Semiconductor Ltd.
>   *
>   * This program is free software; you can redistribute it and/or
> @@ -188,23 +188,34 @@ static const struct watchdog_ops da9062_watchdog_ops = {
>  	.set_timeout = da9062_wdt_set_timeout,
>  };
>  
> +static const struct of_device_id da9062_compatible_id_table[] = {
> +	{ .compatible = "dlg,da9062-watchdog", .data = &da9062_watchdog_info },
> +	{ },
> +};
> +
>  static int da9062_wdt_probe(struct platform_device *pdev)
>  {
>  	int ret;
>  	struct da9062 *chip;
>  	struct da9062_watchdog *wdt;
> +	const struct of_device_id *match;
>  
>  	chip = dev_get_drvdata(pdev->dev.parent);
>  	if (!chip)
>  		return -EINVAL;
>  
> +	match = of_match_node(da9062_compatible_id_table,
> +			      pdev->dev.of_node);
> +	if (!match)
> +		return -ENXIO;
> +
>  	wdt = devm_kzalloc(&pdev->dev, sizeof(*wdt), GFP_KERNEL);
>  	if (!wdt)
>  		return -ENOMEM;
>  
>  	wdt->hw = chip;
>  
> -	wdt->wdtdev.info = &da9062_watchdog_info;
> +	wdt->wdtdev.info = (const struct watchdog_info *)match->data;

I don't see why you would need match->data or of_match_node above.

Guenter

>  	wdt->wdtdev.ops = &da9062_watchdog_ops;
>  	wdt->wdtdev.min_timeout = DA9062_WDT_MIN_TIMEOUT;
>  	wdt->wdtdev.max_timeout = DA9062_WDT_MAX_TIMEOUT;
> @@ -244,11 +255,12 @@ static struct platform_driver da9062_wdt_driver = {
>  	.remove = da9062_wdt_remove,
>  	.driver = {
>  		.name = "da9062-watchdog",
> +		.of_match_table = da9062_compatible_id_table,
>  	},
>  };
>  module_platform_driver(da9062_wdt_driver);
>  
>  MODULE_AUTHOR("S Twiss <stwiss.opensource@...semi.com>");
> -MODULE_DESCRIPTION("WDT device driver for Dialog DA9062");
> +MODULE_DESCRIPTION("WDT device driver for Dialog DA9062 and DA9061");
>  MODULE_LICENSE("GPL");
>  MODULE_ALIAS("platform:da9062-watchdog");
> -- 
> end-of-patch for PATCH V2
>