linux-kernel - Re: [PATCH v7 1/2] dt-bindings: edac: arm-dmc520.txt

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Date:   Thu, 21 Nov 2019 14:43:50 -0600
From:   Rob Herring <robh@...nel.org>
To:     Shiping Ji <shiping.linux@...il.com>
Cc:     bp@...en8.de, james.morse@....com, mark.rutland@....com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        mchehab@...nel.org, linux-edac@...r.kernel.org, sashal@...nel.org,
        hangl@...rosoft.com, lewan@...rosoft.com, ruizhao@...rosoft.com,
        scott.branden@...adcom.com, yuqing.shen@...adcom.com,
        ray.jui@...adcom.com, shji@...rosoft.com, wangglei@...il.com
Subject: Re: [PATCH v7 1/2] dt-bindings: edac: arm-dmc520.txt

On Sun, Nov 17, 2019 at 06:10:43PM -0800, Shiping Ji wrote:
> This is the device tree bindings for new EDAC driver dmc520_edac.c.
> 
> Signed-off-by: Lei Wang <leiwang_git@...look.com>
> Reviewed-by: James Morse <james.morse@....com>
> 
> ---
>      Changes in v7:
>          - Added arm prefix to the interrupt-config property
> 
> ---
>  .../devicetree/bindings/edac/arm-dmc520.txt   | 26 +++++++++++++++++++
>  1 file changed, 26 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/edac/arm-dmc520.txt
> 
> diff --git a/Documentation/devicetree/bindings/edac/arm-dmc520.txt b/Documentation/devicetree/bindings/edac/arm-dmc520.txt
> new file mode 100644
> index 000000000000..476cf8b76f2a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/edac/arm-dmc520.txt
> @@ -0,0 +1,26 @@
> +* ARM DMC-520 EDAC node
> +
> +Required properties:
> +- compatible  : "brcm,dmc-520", "arm,dmc-520".
> +- reg   : Address range of the DMC-520 registers.
> +- interrupts  : DMC-520 interrupt numbers. The example below specifies
> +     two interrupt lines for dram_ecc_errc_int and
> +     dram_ecc_errd_int.
> +- arm,interrupt-config : This is an array of interrupt masks. For each of the
> +     above interrupt line, add one interrupt mask element to
> +     it. That is, there is a 1:1 mapping from each interrupt
> +     line to an interrupt mask. An interrupt mask can represent
> +     multiple interrupts being enabled. Refer to interrupt_control
> +     register in DMC-520 TRM for interrupt mapping. In the example
> +     below, the interrupt configuration enables dram_ecc_errc_int
> +     and dram_ecc_errd_int. And each interrupt is connected to
> +     a separate interrupt line.

Looking at this again, I think I now understand what you are trying to 
do. Your mask is just what interrupt line each one is. We have a 
standard way of doing this either by using indices of 'interrupts' or 
with interrupt-names. The latter probably works best in this case.

You need to define *all* the interrupt-names:
combined
ram_ecc_errc
ram_ecc_errd
dram_ecc_errc
dram_ecc_errd
failed_access
failed_prog
link_err
temperature_event
arch_fsm
phy_request

I'm not sure if all the '*_oflow' interrupts should be listed too. It 
doesn't seem all that useful to get a 2nd interrupt.

Your node should list all that are hooked up in the h/w, not just the 
ones you need for EDAC.

Rob