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Message-ID: <20161026185926.GA16142@roeck-us.net>
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
>
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