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>
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 957f5d7..ee5f167 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -2117,6 +2117,7 @@
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 @@
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 @@
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);