linux-kernel - Re: [PATCH 3/4] dt-bindings: mmc: sdhci-st: Mention the discretionary "icn" clock

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Date:   Mon, 12 Sep 2016 14:35:02 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     Patrice CHOTARD <patrice.chotard@...com>,
        Peter Griffin <peter.griffin@...aro.org>,
        Rob Herring <robh@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kernel@...inux.com
Subject: Re: [PATCH 3/4] dt-bindings: mmc: sdhci-st: Mention the discretionary
 "icn" clock

On 8 September 2016 at 11:11, Lee Jones <lee.jones@...aro.org> wrote:
> The interconnect (ICN) clock is required for functional working of
> MMC on some ST platforms.  When not supplied it can result in
> broken MMC and the following output:
>
>         [   13.916949] mmc0: Timeout waiting for hardware interrupt.
>         [   13.922349] sdhci: =========== REGISTER DUMP (mmc0)===========
>         [   13.928175] sdhci: Sys addr: 0x00000000 | Version:  0x00001002
>         [   13.933999] sdhci: Blk size: 0x00007040 | Blk cnt:  0x00000001
>         [   13.939825] sdhci: Argument: 0x00fffff0 | Trn mode: 0x00000013
>         [   13.945650] sdhci: Present:  0x1fff0206 | Host ctl: 0x00000011
>         [   13.951475] sdhci: Power:    0x0000000f | Blk gap:  0x00000080
>         [   13.957300] sdhci: Wake-up:  0x00000000 | Clock:    0x00003f07
>         [   13.963126] sdhci: Timeout:  0x00000004 | Int stat: 0x00000000
>         [   13.968952] sdhci: Int enab: 0x02ff008b | Sig enab: 0x02ff008b
>         [   13.974777] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
>         [   13.980602] sdhci: Caps:     0x21ed3281 | Caps_1:   0x00000000
>         [   13.986428] sdhci: Cmd:      0x0000063a | Max curr: 0x00000000
>         [   13.992252] sdhci: Host ctl2: 0x00000000
>         [   13.996166] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x7c048200
>         [   14.001990] sdhci: ===========================================
>         [   14.009802] mmc0: Got data interrupt 0x02000000 even though no data operation was in progress.
>
> Signed-off-by: Lee Jones <lee.jones@...aro.org>

Thanks, applied for fixes!

Kind regards
Uffe

> ---
>  Documentation/devicetree/bindings/mmc/sdhci-st.txt | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-st.txt b/Documentation/devicetree/bindings/mmc/sdhci-st.txt
> index 88faa91..3cd4c43 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-st.txt
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-st.txt
> @@ -10,7 +10,7 @@ Required properties:
>                         subsystem (mmcss) inside the FlashSS (available in STiH407 SoC
>                         family).
>
> -- clock-names:         Should be "mmc".
> +- clock-names:         Should be "mmc" and "icn".  (NB: The latter is not compulsory)
>                         See: Documentation/devicetree/bindings/resource-names.txt
>  - clocks:              Phandle to the clock.
>                         See: Documentation/devicetree/bindings/clock/clock-bindings.txt
> --
> 2.9.3
>