diff options
author | Hans de Goede <hdegoede@redhat.com> | 2015-04-01 17:26:23 +0200 |
---|---|---|
committer | Ulf Hansson <ulf.hansson@linaro.org> | 2015-04-02 10:59:10 +0200 |
commit | 81f8a7be6642b4c26ab681b2e0f4c4120a6de1b0 (patch) | |
tree | 24868729a06b2b5fe678e7c9649c7e5a90cff9dc /Documentation/devicetree/bindings/mmc | |
parent | 2391b340ca5b7dd041a2bf86afe12bc004acb583 (diff) | |
download | op-kernel-dev-81f8a7be6642b4c26ab681b2e0f4c4120a6de1b0.zip op-kernel-dev-81f8a7be6642b4c26ab681b2e0f4c4120a6de1b0.tar.gz |
mmc: Add support for marking hpi as broken through devicetree
The eMMC on a tablet I've will stop working / communicating as soon as
the kernel executes:
mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_HPI_MGMT, 1,
card->ext_csd.generic_cmd6_time);
There seems to be no way to reliable identify eMMC-s which have a broken
hpi implementation, but at least for eMMC's which are soldered onto a board
we can work around this by specifying that hpi is broken in devicetree.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'Documentation/devicetree/bindings/mmc')
-rw-r--r-- | Documentation/devicetree/bindings/mmc/mmc-card.txt | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmc-card.txt b/Documentation/devicetree/bindings/mmc/mmc-card.txt new file mode 100644 index 0000000..a70fcd6 --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/mmc-card.txt @@ -0,0 +1,31 @@ +mmc-card / eMMC bindings +------------------------ + +This documents describes the devicetree bindings for a mmc-host controller +child node describing a mmc-card / an eMMC, see "Use of Function subnodes" +in mmc.txt + +Required properties: +-compatible : Must be "mmc-card" +-reg : Must be <0> + +Optional properties: +-broken-hpi : Use this to indicate that the mmc-card has a broken hpi + implementation, and that hpi should not be used + +Example: + +&mmc2 { + pinctrl-names = "default"; + pinctrl-0 = <&mmc2_pins_a>; + vmmc-supply = <®_vcc3v3>; + bus-width = <8>; + non-removable; + status = "okay"; + + mmccard: mmccard@0 { + reg = <0>; + compatible = "mmc-card"; + broken-hpi; + }; +}; |