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Message-ID: <CAPLW+4mJYBhrYo58oF7hYXi+5Nt2ROvqDXB_=zezJsuExW6oBA@mail.gmail.com>
Date: Sun, 21 Nov 2021 18:25:13 +0200
From: Sam Protsenko <semen.protsenko@...aro.org>
To: Guenter Roeck <linux@...ck-us.net>
Cc: Wim Van Sebroeck <wim@...ux-watchdog.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
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 Sat, 20 Nov 2021 at 22:29, Guenter Roeck <linux@...ck-us.net> wrote:
>
> On 11/7/21 12:29 PM, 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(-)
> >
> > diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
> > index 96aa5d9c6ed4..1456201f27de 100644
> > --- a/drivers/watchdog/s3c2410_wdt.c
> > +++ b/drivers/watchdog/s3c2410_wdt.c
> > @@ -56,6 +56,13 @@
> > #define EXYNOS5_RST_STAT_REG_OFFSET 0x0404
> > #define EXYNOS5_WDT_DISABLE_REG_OFFSET 0x0408
> > #define EXYNOS5_WDT_MASK_RESET_REG_OFFSET 0x040c
> > +#define EXYNOS850_CLUSTER0_NONCPU_OUT 0x1220
> > +#define EXYNOS850_CLUSTER0_NONCPU_INT_EN 0x1244
> > +#define EXYNOS850_CLUSTER1_NONCPU_OUT 0x1620
> > +#define EXYNOS850_CLUSTER1_NONCPU_INT_EN 0x1644
> > +
> > +#define EXYNOS850_CLUSTER0_WDTRESET_BIT 24
> > +#define EXYNOS850_CLUSTER1_WDTRESET_BIT 23
> >
> > /**
> > * Quirk flags for different Samsung watchdog IP-cores.
> > @@ -205,6 +212,30 @@ static const struct s3c2410_wdt_variant drv_data_exynos7 = {
> > QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_AUTO_DISABLE,
> > };
> >
> > +static const struct s3c2410_wdt_variant drv_data_exynos850_cl0 = {
> > + .mask_reset_reg = EXYNOS850_CLUSTER0_NONCPU_INT_EN,
> > + .mask_bit = 2,
> > + .mask_reset_inv = true,
> > + .rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
> > + .rst_stat_bit = EXYNOS850_CLUSTER0_WDTRESET_BIT,
> > + .cnt_en_reg = EXYNOS850_CLUSTER0_NONCPU_OUT,
> > + .cnt_en_bit = 7,
> > + .quirks = QUIRK_HAS_WTCLRINT_REG | QUIRK_HAS_PMU_MASK_RESET | \
> > + QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_CNT_EN,
> > +};
> > +
> > +static const struct s3c2410_wdt_variant drv_data_exynos850_cl1 = {
> > + .mask_reset_reg = EXYNOS850_CLUSTER1_NONCPU_INT_EN,
> > + .mask_bit = 2,
> > + .mask_reset_inv = true,
> > + .rst_stat_reg = EXYNOS5_RST_STAT_REG_OFFSET,
> > + .rst_stat_bit = EXYNOS850_CLUSTER1_WDTRESET_BIT,
> > + .cnt_en_reg = EXYNOS850_CLUSTER1_NONCPU_OUT,
> > + .cnt_en_bit = 7,
> > + .quirks = QUIRK_HAS_WTCLRINT_REG | QUIRK_HAS_PMU_MASK_RESET | \
> > + QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_CNT_EN,
> > +};
> > +
> > static const struct of_device_id s3c2410_wdt_match[] = {
> > { .compatible = "samsung,s3c2410-wdt",
> > .data = &drv_data_s3c2410 },
> > @@ -216,6 +247,8 @@ static const struct of_device_id s3c2410_wdt_match[] = {
> > .data = &drv_data_exynos5420 },
> > { .compatible = "samsung,exynos7-wdt",
> > .data = &drv_data_exynos7 },
> > + { .compatible = "samsung,exynos850-wdt",
> > + .data = &drv_data_exynos850_cl0 },
> > {},
> > };
> > MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
> > @@ -587,14 +620,38 @@ static inline const struct s3c2410_wdt_variant *
> > s3c2410_get_wdt_drv_data(struct platform_device *pdev)
> > {
> > const struct s3c2410_wdt_variant *variant;
> > + struct device *dev = &pdev->dev;
> >
> > - variant = of_device_get_match_data(&pdev->dev);
> > + variant = of_device_get_match_data(dev);
> > if (!variant) {
> > /* Device matched by platform_device_id */
> > variant = (struct s3c2410_wdt_variant *)
> > platform_get_device_id(pdev)->driver_data;
> > }
> >
> > + /* Choose Exynos850 driver data w.r.t. cluster index */
> > + if (variant == &drv_data_exynos850_cl0) {
>
> 0-day has a point here. drv_data_exynos850_cl0 is declared inside a CONFIG_OF
> conditional, causing compile failure if CONFIG_OF is not enabled.
>
> Please fix and resubmit.
>
Right. I missed that this driver has also platform device table. Will
send v4 soon.
> Guenter
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