crypto: caam - fix JR platform device subsequent (re)creations

The way Job Ring platform devices are created and released does not
allow for multiple create-release cycles.

JR0 Platform device creation error
JR0 Platform device creation error
caam 2100000.caam: no queues configured, terminating
caam: probe of 2100000.caam failed with error -12

The reason is that platform devices are created for each job ring:

        for_each_available_child_of_node(nprop, np)
                if (of_device_is_compatible(np, "fsl,sec-v4.0-job-ring") ||
                    of_device_is_compatible(np, "fsl,sec4.0-job-ring")) {
                        ctrlpriv->jrpdev[ring] =
                                of_platform_device_create(np, NULL, dev);

which sets OF_POPULATED on the device node, but then it cleans these up:

        /* Remove platform devices for JobRs */
        for (ring = 0; ring < ctrlpriv->total_jobrs; ring++) {
                if (ctrlpriv->jrpdev[ring])
                        of_device_unregister(ctrlpriv->jrpdev[ring]);
        }

which leaves OF_POPULATED set.

Use of_platform_populate / of_platform_depopulate instead.
This allows for a bit of driver clean-up, jrpdev is no longer needed.

Logic changes a bit too:
-exit in case of_platform_populate fails, since currently even QI backend
depends on JR; true, we no longer support the case when "some" of the JR
DT nodes are incorrect
-when cleaning up, caam_remove() would also depopulate RTIC in case
it would have been populated somewhere else - not the case for now

Cc: <stable@vger.kernel.org>
Fixes: 313ea293e9c4d ("crypto: caam - Add Platform driver for Job Ring")
Reported-by: Russell King <rmk+kernel@armlinux.org.uk>
Suggested-by: Rob Herring <robh+dt@kernel.org>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

2 files changed, 19 insertions, 45 deletions

diff --git a/drivers/crypto/caam/ctrl.c b/drivers/crypto/caam/ctrl.c
index fef39f9f41ee..220f94bd1635 100644
--- a/drivers/crypto/caam/ctrl.c
+++ b/drivers/crypto/caam/ctrl.c
@@ -301,15 +301,13 @@ static int caam_remove(struct platform_device *pdev)
         struct device *ctrldev;
         struct caam_drv_private *ctrlpriv;
         struct caam_ctrl __iomem *ctrl;
-        int ring;
 
         ctrldev = &pdev->dev;
         ctrlpriv = dev_get_drvdata(ctrldev);
         ctrl = (struct caam_ctrl __iomem *)ctrlpriv->ctrl;
 
-        /* Remove platform devices for JobRs */
-        for (ring = 0; ring < ctrlpriv->total_jobrs; ring++)
-                of_device_unregister(ctrlpriv->jrpdev[ring]);
+        /* Remove platform devices under the crypto node */
+        of_platform_depopulate(ctrldev);
 
         /* De-initialize RNG state handles initialized by this driver. */
         if (ctrlpriv->rng4_sh_init)
@@ -418,10 +416,21 @@ DEFINE_SIMPLE_ATTRIBUTE(caam_fops_u32_ro, caam_debugfs_u32_get, NULL, "%llu\n");
 DEFINE_SIMPLE_ATTRIBUTE(caam_fops_u64_ro, caam_debugfs_u64_get, NULL, "%llu\n");
 #endif
 
+static const struct of_device_id caam_match[] = {
+        {
+                .compatible = "fsl,sec-v4.0",
+        },
+        {
+                .compatible = "fsl,sec4.0",
+        },
+        {},
+};
+MODULE_DEVICE_TABLE(of, caam_match);
+
 /* Probe routine for CAAM top (controller) level */
 static int caam_probe(struct platform_device *pdev)
 {
-        int ret, ring, ridx, rspec, gen_sk, ent_delay = RTSDCTL_ENT_DLY_MIN;
+        int ret, ring, gen_sk, ent_delay = RTSDCTL_ENT_DLY_MIN;
         u64 caam_id;
         struct device *dev;
         struct device_node *nprop, *np;
@@ -597,47 +606,24 @@ static int caam_probe(struct platform_device *pdev)
                 goto iounmap_ctrl;
         }
 
-        /*
-         * Detect and enable JobRs
-         * First, find out how many ring spec'ed, allocate references
-         * for all, then go probe each one.
-         */
-        rspec = 0;
-        for_each_available_child_of_node(nprop, np)
-                if (of_device_is_compatible(np, "fsl,sec-v4.0-job-ring") ||
-                    of_device_is_compatible(np, "fsl,sec4.0-job-ring"))
-                        rspec++;
-
-        ctrlpriv->jrpdev = devm_kcalloc(&pdev->dev, rspec,
-                                        sizeof(*ctrlpriv->jrpdev), GFP_KERNEL);
-        if (ctrlpriv->jrpdev == NULL) {
-                ret = -ENOMEM;
+        ret = of_platform_populate(nprop, caam_match, NULL, dev);
+        if (ret) {
+                dev_err(dev, "JR platform devices creation error\n");
                 goto iounmap_ctrl;
         }
 
         ring = 0;
-        ridx = 0;
-        ctrlpriv->total_jobrs = 0;
         for_each_available_child_of_node(nprop, np)
                 if (of_device_is_compatible(np, "fsl,sec-v4.0-job-ring") ||
                     of_device_is_compatible(np, "fsl,sec4.0-job-ring")) {
-                        ctrlpriv->jrpdev[ring] =
-                                of_platform_device_create(np, NULL, dev);
-                        if (!ctrlpriv->jrpdev[ring]) {
-                                pr_warn("JR physical index %d: Platform device creation error\n",
-                                        ridx);
-                                ridx++;
-                                continue;
-                        }
                         ctrlpriv->jr[ring] = (struct caam_job_ring __iomem __force *)
                                              ((__force uint8_t *)ctrl +
-                                             (ridx + JR_BLOCK_NUMBER) *
+                                             (ring + JR_BLOCK_NUMBER) *
                                               BLOCK_OFFSET
                                              );
                         ctrlpriv->total_jobrs++;
                         ring++;
-                        ridx++;
-        }
+                }
 
         /* Check to see if QI present. If so, enable */
         ctrlpriv->qi_present =
@@ -847,17 +833,6 @@ disable_caam_ipg:
         return ret;
 }
 
-static struct of_device_id caam_match[] = {
-        {
-                .compatible = "fsl,sec-v4.0",
-        },
-        {
-                .compatible = "fsl,sec4.0",
-        },
-        {},
-};
-MODULE_DEVICE_TABLE(of, caam_match);
-
 static struct platform_driver caam_driver = {
         .driver = {
                 .name = "caam",
diff --git a/drivers/crypto/caam/intern.h b/drivers/crypto/caam/intern.h
index e2bcacc1a921..dbed8baeebe5 100644
--- a/drivers/crypto/caam/intern.h
+++ b/drivers/crypto/caam/intern.h
@@ -66,7 +66,6 @@ struct caam_drv_private_jr {
 struct caam_drv_private {
 
         struct device *dev;
-        struct platform_device **jrpdev; /* Alloc'ed array per sub-device */
         struct platform_device *pdev;
 
         /* Physical-presence section */