diff options
| author | Doug Anderson <dianders@chromium.org> | 2013-06-07 21:28:30 +0400 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2013-06-27 20:39:10 +0400 |
| commit | 3c6d89ea34605df0f4fe6e6dac5abcb781f82f53 (patch) | |
| tree | e557f975d861bd72b04c78e7aeec470532ea1627 /drivers/mmc | |
| parent | 870556a3dfb16d004f8e09dd59a1eddc727fcf0c (diff) | |
| download | linux-3c6d89ea34605df0f4fe6e6dac5abcb781f82f53.tar.xz | |
mmc: dw_mmc: Add the ability to set the ciu clock frequency
As of now we rely on code outside of the driver to set the ciu clock
frequency. There's no reason to do that. Add support for setting up
the clock in the driver during probe.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/dw_mmc.c | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 957f5d7ea426..ee5f1676f14e 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); |