On 10/28/2015 03:06 AM, Stephen Boyd wrote:
> On 10/27, Stephen Boyd wrote:
>> +
>> +int qcom_cc_register_board_clk(struct device *dev, const char *path,
>> + const char *name, unsigned long rate)
>> +{
>> + return _qcom_cc_register_board_clk(dev, path, name, rate,
>> + !IS_ENABLED(CONFIG_QCOM_RPMCC));
>
> I just realized that we could have this config enabled but the
> driver never probes on a certain platform. So we'll need to do
> some sort of search to see if the rpmcc node exists and also
> check to see if the driver is enabled. I guess we can do that all
> here in this function as long as we have a compatible =
> "qcom,rpmcc" as a more generic property for the rpm clock
> controller node. So if the config is enabled, search the dt tree
> for a qcom,rpmcc node. If the rpmcc node is there, the last
> argument is false, otherwise it's true.
I like the approach. We could have both compatible strings like:
compatible = "qcom,rpmcc-msm8916", "qcom,rpmcc";
The only possible issue i could imagine is the case when rpmcc
driver probe fails - does not enable scaling for example. Then we
will be left without xo. But maybe we should not handle this
scenario anyway.
>
> ---8<----
> diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
> index 572851b5bc16..215a41ba0135 100644
> --- a/drivers/clk/qcom/common.c
> +++ b/drivers/clk/qcom/common.c
> @@ -17,6 +17,7 @@
> #include <linux/platform_device.h>
> #include <linux/clk-provider.h>
> #include <linux/reset-controller.h>
> +#include <linux/of.h>
>
> #include "common.h"
> #include "clk-rcg.h"
> @@ -152,7 +153,18 @@ static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
> int qcom_cc_register_board_clk(struct device *dev, const char *path,
> const char *name, unsigned long rate)
> {
> - return _qcom_cc_register_board_clk(dev, path, name, rate, true);
> + bool add_factor = true;
> + struct device_node *node;
> +
> + /* The RPM clock driver will add the factor clock if present */
> + if (IS_ENABLED(CONFIG_QCOM_RPMCC)) {
> + node = of_find_compatible_node(NULL, NULL, "qcom,rpmcc");
> + if (node)
if (node && of_device_is_available(node))
to handle also the case with status="disabled"
> + add_factor = false;
> + of_node_put(node);
> + }
> +
> + return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
> }
> EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);
>
>
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