Commit 62a4cdea authored by Chris Brandt's avatar Chris Brandt Committed by Ulf Hansson

mmc: sh_mobile_sdhi: explain clock bindings

In the case of a single clock source, you don't need names. However,
if the controller has 2 clock sources, you need to name them correctly
so the driver can find the 2nd one. The 2nd clock is for the internal
card detect logic.
Signed-off-by: default avatarChris Brandt <chris.brandt@renesas.com>
Reviewed-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Reviewed-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Acked-by: default avatarRob Herring <robh@kernel.org>
parent 34a16547
...@@ -25,6 +25,19 @@ Required properties: ...@@ -25,6 +25,19 @@ Required properties:
"renesas,sdhi-r8a7795" - SDHI IP on R8A7795 SoC "renesas,sdhi-r8a7795" - SDHI IP on R8A7795 SoC
"renesas,sdhi-r8a7796" - SDHI IP on R8A7796 SoC "renesas,sdhi-r8a7796" - SDHI IP on R8A7796 SoC
- clocks: Most controllers only have 1 clock source per channel. However, on
some variations of this controller, the internal card detection
logic that exists in this controller is sectioned off to be run by a
separate second clock source to allow the main core clock to be turned
off to save power.
If 2 clocks are specified by the hardware, you must name them as
"core" and "cd". If the controller only has 1 clock, naming is not
required.
Below is the number clocks for each supported SoC:
1: SH73A0, R8A73A4, R8A7740, R8A7778, R8A7779, R8A7790
R8A7791, R8A7792, R8A7793, R8A7794, R8A7795, R8A7796
2: R7S72100
Optional properties: Optional properties:
- toshiba,mmc-wrprotect-disable: write-protect detection is unavailable - toshiba,mmc-wrprotect-disable: write-protect detection is unavailable
- pinctrl-names: should be "default", "state_uhs" - pinctrl-names: should be "default", "state_uhs"
......
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