On Thu, Sep 03, 2015 at 02:33:22PM -0700, Stephen Boyd wrote:

On 07/20, Andy Gross wrote:

quoted

This patch creates a platform driver for the SCM so that we can adequately
manage resources.  This removes clients having to carry the necessary
clocks to use the SCM resources.

Signed-off-by: Andy Gross <redacted>
---

It would be nice if we could use this platform device for doing
the DMAish memory allocations that we do in this driver too. I
guess one complication there is that we would need to allocate
memory with the DMA APIs before CPUs are brought up
(early_initcall level).

Yeah that's one thing we could do but we'd have to defer the memory stuff until
it's used the first time (specific calls require it).

quoted

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index 45c008d..5dd0514 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c

@@ -15,14 +15,57 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  * 02110-1301, USA.
  */
-
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>

This include is here twice.

quoted

 #include <linux/cpumask.h>
 #include <linux/export.h>
 #include <linux/types.h>
 #include <linux/qcom_scm.h>
+#include <linux/of.h>
+#include <linux/clk.h>
 

[...]

quoted

+
+/**
+ * qcom_scm_is_available() - Checks if SCM is available
+ */
+bool qcom_scm_is_available(void)
+{
+	return !!__scm;
+}
+EXPORT_SYMBOL(qcom_scm_is_available);
+
+static int qcom_scm_remove(struct platform_device *pdev)
+{
+	__scm = NULL;
+
+	return 0;
+}

Maybe we just shouldn't allow this? The firmware isn't going
anywhere at runtime, and this driver is currently marked as
bool in the Kconfig.

Fair enough.

quoted

+
+static const struct of_device_id qcom_scm_dt_match[] = {
+	{ .compatible = "qcom,scm",},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, qcom_scm_dt_match);
+
+static struct platform_driver qcom_scm_driver = {
+	.driver = {
+		.name	= "scm",

Maybe 'qcom_scm' ?

yeah i should have used that.

quoted

+		.of_match_table = qcom_scm_dt_match,
+	},
+	.probe = qcom_scm_probe,
+	.remove = qcom_scm_remove,
+};
+
+module_platform_driver(qcom_scm_driver);

Isn't there some sort of builtin_platform_driver() macro for
builtin modules?

I'll take a look and convert.


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