linux-kernel - Re: [PATCH v3 12/12] watchdog: s3c2410: Add Exynos850 support

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Message-ID: <0bf73f1a-3be0-5135-747c-f31eb4007314@canonical.com>
Date:   Mon, 8 Nov 2021 14:25:09 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Sam Protsenko <semen.protsenko@...aro.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Rob Herring <robh+dt@...nel.org>
Cc:     linux-watchdog@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org
Subject: Re: [PATCH v3 12/12] watchdog: s3c2410: Add Exynos850 support

On 07/11/2021 21:29, Sam Protsenko wrote:
> Exynos850 is a bit different from SoCs already supported in WDT driver:
>   - AUTOMATIC_WDT_RESET_DISABLE register is removed, so its value is
>     always 0; .disable_auto_reset callback is not set for that reason
>   - MASK_WDT_RESET_REQUEST register is replaced with
>     CLUSTERx_NONCPU_IN_EN register; instead of masking (disabling) WDT
>     reset interrupt it's now enabled with the same value; .mask_reset
>     callback is reused for that functionality though
>   - To make WDT functional, WDT counter needs to be enabled in
>     CLUSTERx_NONCPU_OUT register; it's done using .enable_counter
>     callback
> 
> Also Exynos850 has two CPU clusters, each has its own dedicated WDT
> instance. Different PMU registers and bits are used for each cluster. So
> driver data is now modified in probe, adding needed info depending on
> cluster index passed from device tree.
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> ---
> Changes in v3:
>   - Renamed "samsung,index" property to more descriptive
>     "samsung,cluster-index"
>   - Used pre-defined and completely set driver data for cluster0 and
>     cluster1
> 
> Changes in v2:
>   - Used single compatible for Exynos850, populating missing driver data
>     in probe
>   - Added "index" property to specify CPU cluster index
> 
>  drivers/watchdog/s3c2410_wdt.c | 62 +++++++++++++++++++++++++++++++++-
>  1 file changed, 61 insertions(+), 1 deletion(-)
> 


Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>


Best regards,
Krzysztof