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Subject[PATCH 05/10] fsl-mc/dprc-driver: Remove domain init order dependencies
Date
Use new irq_domain_request_host_*() interface which allows independent
parent and child initialization using an irq domain request handler.
This makes it possible to move its initialization to a later point
during boot. All domains can be initialized in the same initcall level
then.

Signed-off-by: Robert Richter <rrichter@cavium.com>
---
drivers/bus/fsl-mc/dprc-driver.c | 41 ++++++++++++++++++++++++++++++++++++++++
drivers/bus/fsl-mc/fsl-mc-msi.c | 6 +-----
2 files changed, 42 insertions(+), 5 deletions(-)

diff --git a/drivers/bus/fsl-mc/dprc-driver.c b/drivers/bus/fsl-mc/dprc-driver.c
index 52c7e15143d6..2f41886c8e00 100644
--- a/drivers/bus/fsl-mc/dprc-driver.c
+++ b/drivers/bus/fsl-mc/dprc-driver.c
@@ -10,7 +10,9 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
#include <linux/msi.h>
+#include <linux/of.h>
#include <linux/fsl/mc.h>

#include "fsl-mc-private.h"
@@ -575,6 +577,40 @@ static int dprc_setup_irq(struct fsl_mc_device *mc_dev)
return error;
}

+static int dprc_probe(struct fsl_mc_device *mc_dev);
+
+static int dprc_probe_late(struct irq_domain *parent, void *priv)
+{
+ struct fsl_mc_device *mc_dev = priv;
+
+ of_node_put(mc_dev->dev.parent->of_node);
+ of_node_put(irq_domain_get_of_node(parent));
+
+ return dprc_probe(mc_dev);
+}
+
+static int dprc_register_msi_domain(struct fsl_mc_device *mc_dev)
+{
+ struct device_node *mc_of_node, *msi_np;
+ int err = -EINVAL;
+
+ mc_of_node = of_node_get(mc_dev->dev.parent->of_node);
+
+ msi_np = of_parse_phandle(mc_of_node, "msi-parent", 0);
+ if (msi_np && !of_property_read_bool(msi_np, "#msi-cells"))
+ err = irq_domain_request_host(msi_np, DOMAIN_BUS_FSL_MC_MSI,
+ dprc_probe_late, mc_dev);
+
+ if (err) {
+ pr_err("Unable to find fsl-mc MSI domain for %pOF\n",
+ mc_of_node);
+ of_node_put(msi_np);
+ of_node_put(mc_of_node);
+ }
+
+ return err;
+}
+
/**
* dprc_probe - callback invoked when a DPRC is being bound to this driver
*
@@ -641,6 +677,11 @@ static int dprc_probe(struct fsl_mc_device *mc_dev)

error = fsl_mc_find_msi_domain(parent_dev,
&mc_msi_domain);
+
+ if (error == -ENOENT)
+ /* initialize later */
+ return dprc_register_msi_domain(mc_dev);
+
if (error < 0) {
dev_warn(&mc_dev->dev,
"WARNING: MC bus without interrupt support\n");
diff --git a/drivers/bus/fsl-mc/fsl-mc-msi.c b/drivers/bus/fsl-mc/fsl-mc-msi.c
index 8b9c66d7c4ff..550d2ed07f69 100644
--- a/drivers/bus/fsl-mc/fsl-mc-msi.c
+++ b/drivers/bus/fsl-mc/fsl-mc-msi.c
@@ -185,12 +185,8 @@ int fsl_mc_find_msi_domain(struct device *mc_platform_dev,

msi_domain = of_msi_get_domain(mc_platform_dev, mc_of_node,
DOMAIN_BUS_FSL_MC_MSI);
- if (!msi_domain) {
- pr_err("Unable to find fsl-mc MSI domain for %pOF\n",
- mc_of_node);
-
+ if (!msi_domain)
return -ENOENT;
- }

*mc_msi_domain = msi_domain;
return 0;
--
2.11.0
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