dt-bindings: mmc: sdhci-st: Mention the discretionary "icn" clock
authorLee Jones <lee.jones@linaro.org>
Thu, 8 Sep 2016 09:11:35 +0000 (11:11 +0200)
committerUlf Hansson <ulf.hansson@linaro.org>
Mon, 12 Sep 2016 08:31:37 +0000 (10:31 +0200)
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@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Documentation/devicetree/bindings/mmc/sdhci-st.txt

index 88faa91125bf5c92e76afcb6f0c9cdfc01031827..3cd4c43a32601957038eea8595c1e5d42651f94d 100644 (file)
@@ -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