linux-kernel - Re: [PATCH 2/5] drm/exynos: mixer: Use platform_get

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Date:   Sat, 15 Jan 2022 01:40:16 +0000
From:   "Lad, Prabhakar" <prabhakar.csengg@...il.com>
To:     Inki Dae <inki.dae@...sung.com>
Cc:     Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>,
        DRI Development <dri-devel@...ts.freedesktop.org>,
        LAK <linux-arm-kernel@...ts.infradead.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        Rob Herring <robh+dt@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] drm/exynos: mixer: Use platform_get_irq() to get the interrupt

Hi Inki,

On Fri, Jan 14, 2022 at 11:08 AM Inki Dae <inki.dae@...sung.com> wrote:
>
> Hi Lad Prabhakar,
>
> 21. 12. 23. 오전 4:01에 Lad Prabhakar 이(가) 쓴 글:
> > platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
> > allocation of IRQ resources in DT core code, this causes an issue
> > when using hierarchical interrupt domains using "interrupts" property
> > in the node as this bypassed the hierarchical setup and messed up the
> > irq chaining.
> >
> > In preparation for removal of static setup of IRQ resource from DT core
> > code use platform_get_irq().
> >
> > Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
> > ---
> > Hi,
> >
> > Ideally I would expect the mixer_resources_init() to be called from probe
> > instead from the bind callback. If platform_get_irq() returns -EPROBE_DEFER
> > the bind callback will fail :(
>
> If the bind callback failed then probe function of exynos drm driver will call -EPROBE_DEFER like below so it must be no problem :),
> --------------------------------------------
> in exynos_drm_platform_probe function
>     component_master_add_with_match()
>
> in component_master_add_with_match function
>     try_to_bring_up_master()
>
Thank you for the clarification.

Cheers,
Prabhakar