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scsi: ufs-qcom: Implement device_reset vops

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The UFS_RESET pin on Qualcomm SoCs are controlled by TLMM and exposed
through the GPIO framework. Acquire the device-reset GPIO and use this to
implement the device_reset vops, to allow resetting the attached memory.

Based on downstream support implemented by Subhash Jadavani
<subhashj@codeaurora.org>.

Link: https://lore.kernel.org/r/20190828191756.24312-3-bjorn.andersson@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Avri Altman <Avri.Altman@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bjorn Andersson
2019-08-28 12:17:55 -07:00
committed by Martin K. Petersen
parent d8d9f7931a
commit b8416b2fed
3 changed files with 42 additions and 0 deletions
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2
Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
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@@ -54,6 +54,8 @@ Optional properties:
PHY reset from the UFS controller.
- resets : reset node register
- reset-names : describe reset node register, the "rst" corresponds to reset the whole UFS IP.
- reset-gpios : A phandle and gpio specifier denoting the GPIO connected
to the RESET pin of the UFS memory device.
Note: If above properties are not defined it can be assumed that the supply
regulators or clocks are always on.