diff options
| author | Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> | 2015-05-14 10:22:46 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2015-06-01 10:07:10 +0300 |
| commit | 89d49a706ca417c55c046d2580403be578cadaab (patch) | |
| tree | 68cc0721a6767f91f8e9e700b2e140deefbdd324 /Documentation | |
| parent | 1b1a694d53cbe42eba4feb260eba4acc316c44f0 (diff) | |
| download | linux-89d49a706ca417c55c046d2580403be578cadaab.tar.xz | |
mmc: sh_mmcif: calculate best clock with parent clock
MMCIF IP on R-Car series has parent clock which can be set several rate,
and it was not implemented on old SH-Mobile series (= SH-Mobile series
parent clock was fixed rate) R-Car series MMCIF can use more high speed
access if it setups parent clock. This patch adds parent clock setup
method. It will be used if DT has "max-frequency", and then, this driver
assumes it is booted on R-Car Gen2 or later SoC. Because SH-Mobile series
(which doesn't boot from DT) and R-Car series (which boots from DT) have
different divider.
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Keita Kobayashi <keita.kobayashi.ym@renesas.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
[Ulf: Silence compiler warning]
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/renesas,mmcif.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/mmc/renesas,mmcif.txt b/Documentation/devicetree/bindings/mmc/renesas,mmcif.txt index 299081f94abd..d38942f6c5ae 100644 --- a/Documentation/devicetree/bindings/mmc/renesas,mmcif.txt +++ b/Documentation/devicetree/bindings/mmc/renesas,mmcif.txt @@ -18,6 +18,8 @@ Required properties: dma-names property. - dma-names: must contain "tx" for the transmit DMA channel and "rx" for the receive DMA channel. +- max-frequency: Maximum operating clock frequency, driver uses default clock + frequency if it is not set. Example: R8A7790 (R-Car H2) MMCIF0 @@ -29,4 +31,5 @@ Example: R8A7790 (R-Car H2) MMCIF0 clocks = <&mstp3_clks R8A7790_CLK_MMCIF0>; dmas = <&dmac0 0xd1>, <&dmac0 0xd2>; dma-names = "tx", "rx"; + max-frequency = <97500000>; }; |