Re: [PATCH v5 16/20] watchdog: s3c2410_wdt: Add support for Google gs101 SoC

[Peter Griffin <peter.griffin@linaro.org>]

Hi Sam,

On Sat, 2 Dec 2023 at 01:02, Sam Protsenko <semen.protsenko@linaro.org> wrote:
>
> On Fri, Dec 1, 2023 at 10:11 AM Peter Griffin <peter.griffin@linaro.org> wrote:
> >
> > This patch adds the compatibles and drvdata for the Google
> > gs101 SoC found in Pixel 6, Pixel 6a & Pixel 6 pro phones.
> >
> > Similar to Exynos850 it has two watchdog instances, one for
> > each cluster and has some control bits in PMU registers.
> >
> > gs101 also has the dbgack_mask bit in wtcon register, so
> > we also enable QUIRK_HAS_DBGACK_BIT.
> >
> > Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
> > ---
> >  drivers/watchdog/s3c2410_wdt.c | 47 ++++++++++++++++++++++++++++++----
> >  1 file changed, 42 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/watchdog/s3c2410_wdt.c b/drivers/watchdog/s3c2410_wdt.c
> > index 39f3489e41d6..c1ae71574457 100644
> > --- a/drivers/watchdog/s3c2410_wdt.c
> > +++ b/drivers/watchdog/s3c2410_wdt.c
> > @@ -68,6 +68,13 @@
> >  #define EXYNOSAUTOV9_CLUSTER0_WDTRESET_BIT     25
> >  #define EXYNOSAUTOV9_CLUSTER1_WDTRESET_BIT     24
> >
> > +#define GS_CLUSTER0_NONCPU_OUT                 0x1220
> > +#define GS_CLUSTER1_NONCPU_OUT                 0x1420
> > +#define GS_CLUSTER0_NONCPU_INT_EN              0x1244
> > +#define GS_CLUSTER1_NONCPU_INT_EN              0x1444
> > +#define GS_CLUSTER2_NONCPU_INT_EN              0x1644
> > +#define GS_RST_STAT_REG_OFFSET                 0x3B44
> > +
> >  /**
> >   * DOC: Quirk flags for different Samsung watchdog IP-cores
> >   *
> > @@ -269,6 +276,30 @@ static const struct s3c2410_wdt_variant drv_data_exynosautov9_cl1 = {
> >                   QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_CNT_EN,
> >  };
> >
> > +static const struct s3c2410_wdt_variant drv_data_gs101_cl0 = {
> > +       .mask_reset_reg = GS_CLUSTER0_NONCPU_INT_EN,
> > +       .mask_bit = 2,
> > +       .mask_reset_inv = true,
> > +       .rst_stat_reg = GS_RST_STAT_REG_OFFSET,
> > +       .rst_stat_bit = 0,
> > +       .cnt_en_reg = GS_CLUSTER0_NONCPU_OUT,
> > +       .cnt_en_bit = 8,
> > +       .quirks = QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_MASK_RESET | QUIRK_HAS_PMU_CNT_EN |
>
> Please keep it at 80 characters limit.

will fix
>
> > +                 QUIRK_HAS_WTCLRINT_REG | QUIRK_HAS_DBGACK_BIT,
> > +};
> > +
> > +static const struct s3c2410_wdt_variant drv_data_gs101_cl1 = {
> > +       .mask_reset_reg = GS_CLUSTER1_NONCPU_INT_EN,
> > +       .mask_bit = 2,
> > +       .mask_reset_inv = true,
> > +       .rst_stat_reg = GS_RST_STAT_REG_OFFSET,
> > +       .rst_stat_bit = 1,
> > +       .cnt_en_reg = GS_CLUSTER1_NONCPU_OUT,
> > +       .cnt_en_bit = 7,
> > +       .quirks = QUIRK_HAS_PMU_RST_STAT | QUIRK_HAS_PMU_MASK_RESET | QUIRK_HAS_PMU_CNT_EN |
>
> Please keep it at 80 characters limit.

will fix
>
> > +                 QUIRK_HAS_WTCLRINT_REG | QUIRK_HAS_DBGACK_BIT,
> > +};
> > +
> >  static const struct of_device_id s3c2410_wdt_match[] = {
> >         { .compatible = "samsung,s3c2410-wdt",
> >           .data = &drv_data_s3c2410 },
> > @@ -284,6 +315,8 @@ static const struct of_device_id s3c2410_wdt_match[] = {
> >           .data = &drv_data_exynos850_cl0 },
> >         { .compatible = "samsung,exynosautov9-wdt",
> >           .data = &drv_data_exynosautov9_cl0 },
> > +       { .compatible = "google,gs101-wdt",
> > +         .data = &drv_data_gs101_cl0 },
> >         {},
> >  };
> >  MODULE_DEVICE_TABLE(of, s3c2410_wdt_match);
> > @@ -604,9 +637,10 @@ s3c2410_get_wdt_drv_data(struct platform_device *pdev, struct s3c2410_wdt *wdt)
> >         }
> >
> >  #ifdef CONFIG_OF
> > -       /* Choose Exynos850/ExynosAutov9 driver data w.r.t. cluster index */
> > +       /* Choose Exynos850/ExynosAutov9/gs101 driver data w.r.t. cluster index */
>
> Please keep it at 80 characters limit. Also, maybe just make it more
> generic and mention "Exynos9 platforms" instead of listing all SoCs?
>

Will fix and reword.

> Other than that:
>
> Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>

Thanks!

Peter
>
>
> >         if (variant == &drv_data_exynos850_cl0 ||
> > -           variant == &drv_data_exynosautov9_cl0) {
> > +           variant == &drv_data_exynosautov9_cl0 ||
> > +           variant == &drv_data_gs101_cl0) {
> >                 u32 index;
> >                 int err;
> >
> > @@ -619,9 +653,12 @@ s3c2410_get_wdt_drv_data(struct platform_device *pdev, struct s3c2410_wdt *wdt)
> >                 case 0:
> >                         break;
> >                 case 1:
> > -                       variant = (variant == &drv_data_exynos850_cl0) ?
> > -                               &drv_data_exynos850_cl1 :
> > -                               &drv_data_exynosautov9_cl1;
> > +                       if (variant == &drv_data_exynos850_cl0)
> > +                               variant = &drv_data_exynos850_cl1;
> > +                       else if (variant == &drv_data_exynosautov9_cl0)
> > +                               variant = &drv_data_exynosautov9_cl1;
> > +                       else if (variant == &drv_data_gs101_cl0)
> > +                               variant = &drv_data_gs101_cl1;
> >                         break;
> >                 default:
> >                         return dev_err_probe(dev, -EINVAL, "wrong cluster index: %u\n", index);
> > --
> > 2.43.0.rc2.451.g8631bc7472-goog
> >