diff options
| -rw-r--r-- | Documentation/devicetree/bindings/mmc/synopsis-dw-mshc.txt | 16 | ||||
| -rw-r--r-- | drivers/mmc/host/dw_mmc.c | 17 |
2 files changed, 29 insertions, 4 deletions
diff --git a/Documentation/devicetree/bindings/mmc/synopsis-dw-mshc.txt b/Documentation/devicetree/bindings/mmc/synopsis-dw-mshc.txt index d5cc94ecd60..dd31b00f086 100644 --- a/Documentation/devicetree/bindings/mmc/synopsis-dw-mshc.txt +++ b/Documentation/devicetree/bindings/mmc/synopsis-dw-mshc.txt @@ -39,6 +39,19 @@ Required Properties: Optional properties: +* clocks: from common clock binding: handle to biu and ciu clocks for the + bus interface unit clock and the card interface unit clock. + +* clock-names: from common clock binding: Shall be "biu" and "ciu". + If the biu clock is missing we'll simply skip enabling it. If the + ciu clock is missing we'll just assume that the clock is running at + clock-frequency. It is an error to omit both the ciu clock and the + clock-frequency. + +* clock-frequency: should be the frequency (in Hz) of the ciu clock. If this + is specified and the ciu clock is specified then we'll try to set the ciu + clock to this at probe time. + * num-slots: specifies the number of slots supported by the controller. The number of physical slots actually used could be equal or less than the value specified by num-slots. If this property is not specified, the value @@ -70,6 +83,8 @@ board specific portions as listed below. dwmmc0@12200000 { compatible = "snps,dw-mshc"; + clocks = <&clock 351>, <&clock 132>; + clock-names = "biu", "ciu"; reg = <0x12200000 0x1000>; interrupts = <0 75 0>; #address-cells = <1>; @@ -77,6 +92,7 @@ board specific portions as listed below. }; dwmmc0@12200000 { + clock-frequency = <400000000>; num-slots = <1>; supports-highspeed; broken-cd; diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 957f5d7ea42..ee5f1676f14 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -2117,6 +2117,7 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host) struct device_node *np = dev->of_node; const struct dw_mci_drv_data *drv_data = host->drv_data; int idx, ret; + u32 clock_frequency; pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL); if (!pdata) { @@ -2143,6 +2144,9 @@ static struct dw_mci_board *dw_mci_parse_dt(struct dw_mci *host) of_property_read_u32(np, "card-detect-delay", &pdata->detect_delay_ms); + if (!of_property_read_u32(np, "clock-frequency", &clock_frequency)) + pdata->bus_hz = clock_frequency; + if (drv_data && drv_data->parse_dt) { ret = drv_data->parse_dt(host); if (ret) @@ -2200,18 +2204,23 @@ int dw_mci_probe(struct dw_mci *host) host->ciu_clk = devm_clk_get(host->dev, "ciu"); if (IS_ERR(host->ciu_clk)) { dev_dbg(host->dev, "ciu clock not available\n"); + host->bus_hz = host->pdata->bus_hz; } else { ret = clk_prepare_enable(host->ciu_clk); if (ret) { dev_err(host->dev, "failed to enable ciu clock\n"); goto err_clk_biu; } - } - if (IS_ERR(host->ciu_clk)) - host->bus_hz = host->pdata->bus_hz; - else + if (host->pdata->bus_hz) { + ret = clk_set_rate(host->ciu_clk, host->pdata->bus_hz); + if (ret) + dev_warn(host->dev, + "Unable to set bus rate to %ul\n", + host->pdata->bus_hz); + } host->bus_hz = clk_get_rate(host->ciu_clk); + } if (drv_data && drv_data->setup_clock) { ret = drv_data->setup_clock(host); |