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| author | Sujit Reddy Thumma <sthumma@codeaurora.org> | 2014-09-25 16:32:23 +0400 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2014-10-01 15:11:19 +0400 |
| commit | c6e79dacd86fd7ddd452fa52b3f4ca996db31e49 (patch) | |
| tree | a1482fd92a23e1c34eaaaaf3a70c1339f1b81eb6 /Documentation | |
| parent | aa497613093412ee26ef4bfa4ffec8391553dfca (diff) | |
| download | linux-c6e79dacd86fd7ddd452fa52b3f4ca996db31e49.tar.xz | |
ufs: Add clock initialization support
Add generic clock initialization support for UFSHCD platform
driver. The clock info is read from device tree using standard
clock bindings. A generic max-clock-frequency-hz property is
defined to save information on maximum operating clock frequency
the h/w supports.
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Signed-off-by: Dolev Raviv <draviv@codeaurora.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt index 65e31173dccd..b0f791a8b28d 100644 --- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt +++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt @@ -21,8 +21,17 @@ Optional properties: - vccq-max-microamp : specifies max. load that can be drawn from vccq supply - vccq2-max-microamp : specifies max. load that can be drawn from vccq2 supply +- clocks : List of phandle and clock specifier pairs +- clock-names : List of clock input name strings sorted in the same + order as the clocks property. +- max-clock-frequency-hz : List of maximum operating frequency stored in the same + order as the clocks property. If this property is not + defined or a value in the array is "0" then it is assumed + that the frequency is set by the parent clock or a + fixed rate clock source. + Note: If above properties are not defined it can be assumed that the supply -regulators are always on. +regulators or clocks are always on. Example: ufshc@0xfc598000 { @@ -37,4 +46,8 @@ Example: vcc-max-microamp = 500000; vccq-max-microamp = 200000; vccq2-max-microamp = 200000; + + clocks = <&core 0>, <&ref 0>, <&iface 0>; + clock-names = "core_clk", "ref_clk", "iface_clk"; + max-clock-frequency-hz = <100000000 19200000 0>; }; |