| From 84e03feab423e6bde5568c8dcd35b7217ceec4a6 Mon Sep 17 00:00:00 2001 |
| From: Chris Brandt <chris.brandt@renesas.com> |
| Date: Wed, 25 Jan 2017 15:28:09 -0500 |
| Subject: [PATCH 159/255] 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: Chris Brandt <chris.brandt@renesas.com> |
| Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be> |
| Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> |
| Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> |
| Acked-by: Rob Herring <robh@kernel.org> |
| (cherry picked from commit 62a4cdead56e5715c61aadd41ab66f49bd3170f1) |
| Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
| --- |
| Documentation/devicetree/bindings/mmc/tmio_mmc.txt | 13 +++++++++++++ |
| 1 file changed, 13 insertions(+) |
| |
| --- a/Documentation/devicetree/bindings/mmc/tmio_mmc.txt |
| +++ b/Documentation/devicetree/bindings/mmc/tmio_mmc.txt |
| @@ -25,6 +25,19 @@ Required properties: |
| "renesas,sdhi-r8a7795" - SDHI IP on R8A7795 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: |
| - toshiba,mmc-wrprotect-disable: write-protect detection is unavailable |
| - pinctrl-names: should be "default", "state_uhs" |
