[PATCH 07/11] mfd: bcm2835-pm: Add support for BCM2711

[Peter Robinson]

On Sun, May 15, 2022 at 9:21 PM Stefan Wahren <stefan.wahren at i2se.com> wrote:
>
> In BCM2711 the new RPiVid ASB took over V3D. The old ASB is still present
> with the ISP and H264 bits, and V3D is in the same place in the new ASB
> as the old one.
>
> As per the devicetree bindings, BCM2711 will provide both the old and
> new ASB resources, so get both of them and pass them into
> 'bcm2835-power,' which will take care of selecting which one to use
> accordingly.
>
> Since the RPiVid ASB's resources were being provided prior to formalizing
> the bindings[1], also support the old firmwares that didn't use

I'm guessing this [1] is referring to "[1] See: 7dbe8c62ceeb ("ARM:
dts: Add minimal Raspberry Pi 4 support")" referred to in the original
patch [1] that Nicolas did, was there a reason to drop the
details/changelog here? The decision not to use bits makes sense I
believe.

[1] https://patchwork.kernel.org/project/linux-arm-kernel/patch/20220213225646.67761-8-pbrobinson@gmail.com/

> 'reg-names.'
>
> Signed-off-by: Stefan Wahren <stefan.wahren at i2se.com>
> ---
>  drivers/mfd/bcm2835-pm.c       | 18 ++++++++++++++++++
>  include/linux/mfd/bcm2835-pm.h |  1 +
>  2 files changed, 19 insertions(+)
>
> diff --git a/drivers/mfd/bcm2835-pm.c b/drivers/mfd/bcm2835-pm.c
> index 1656d786993a..da110767c6a4 100644
> --- a/drivers/mfd/bcm2835-pm.c
> +++ b/drivers/mfd/bcm2835-pm.c
> @@ -28,6 +28,8 @@ static const struct mfd_cell bcm2835_power_devs[] = {
>  static int bcm2835_pm_get_pdata(struct platform_device *pdev,
>                                 struct bcm2835_pm *pm)
>  {
> +       bool is_bcm2711 = of_device_is_compatible(pm->dev->of_node, "brcm,bcm2711-pm");
> +
>         /* If no 'reg-names' property is found we can assume we're using old
>          * firmware.
>          */
> @@ -39,6 +41,7 @@ static int bcm2835_pm_get_pdata(struct platform_device *pdev,
>                         return PTR_ERR(pm->base);
>
>                 pm->asb = devm_platform_ioremap_resource(pdev, 1);
> +               pm->rpivid_asb = devm_platform_ioremap_resource(pdev, 2);

Shouldn't we check if is_bcm2711 before we assign rpivid_asb above?

>         } else {
>                 struct resource *res;
>
> @@ -50,11 +53,25 @@ static int bcm2835_pm_get_pdata(struct platform_device *pdev,
>                                                     "asb");
>                 if (res)
>                         pm->asb = devm_ioremap_resource(&pdev->dev, res);
> +
> +               res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> +                                                   "rpivid_asb");
> +               if (res)
> +                       pm->rpivid_asb = devm_ioremap_resource(&pdev->dev,
> +                                                               res);
>         }
>
>         if (IS_ERR(pm->asb))
>                 pm->asb = NULL;
>
> +       if (IS_ERR(pm->rpivid_asb))
> +               pm->rpivid_asb = NULL;
> +
> +       if (pm->rpivid_asb && !is_bcm2711) {
> +               dev_err(pm->dev, "RPiVid ASB support only present in BCM2711\n");

Should we ever get into this situation? If it's an older get RPi I'm
guessing pm->rpivid_asb should have been set to NULL from the error
above.

> +               return -EINVAL;
> +       }
> +
>         return 0;
>  }
>
> @@ -95,6 +112,7 @@ static int bcm2835_pm_probe(struct platform_device *pdev)
>  static const struct of_device_id bcm2835_pm_of_match[] = {
>         { .compatible = "brcm,bcm2835-pm-wdt", },
>         { .compatible = "brcm,bcm2835-pm", },
> +       { .compatible = "brcm,bcm2711-pm", },
>         {},
>  };
>  MODULE_DEVICE_TABLE(of, bcm2835_pm_of_match);
> diff --git a/include/linux/mfd/bcm2835-pm.h b/include/linux/mfd/bcm2835-pm.h
> index ed37dc40e82a..f70a810c55f7 100644
> --- a/include/linux/mfd/bcm2835-pm.h
> +++ b/include/linux/mfd/bcm2835-pm.h
> @@ -9,6 +9,7 @@ struct bcm2835_pm {
>         struct device *dev;
>         void __iomem *base;
>         void __iomem *asb;
> +       void __iomem *rpivid_asb;
>  };
>
>  #endif /* BCM2835_MFD_PM_H */
> --
> 2.25.1
>