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mmc: dw_mmc: Add the ability to set the ciu clock frequency

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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>
This commit is contained in:
Doug Anderson
2013-06-07 10:28:30 -07:00
committed by Chris Ball
parent 870556a3df
commit 3c6d89ea34
2 changed files with 29 additions and 4 deletions
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17
drivers/mmc/host/dw_mmc.c
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@@ -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);