It does so by adding the following changes:
1. Introducing SCSI_UFS_QCOM as a platform device. Its probe
function registers a set of vops to its driver_data.
2. Adding an optional device tree sub-node, under SCSI_UFSHCD_PLATFORM.
Now, the probe function of SCSI_UFSHCD_PLATFORM invokes the probe
function of its sub-node (if it exists), by calling
of_platform_populate(). It ensures that vops are set, and ready to
be used, by the time the UFSHCD driver starts its initialization
procedure.
Signed-off-by: Yaniv Gardi <ygardi@xxxxxxxxxxxxxx>
---
.../devicetree/bindings/ufs/ufshcd-pltfrm.txt | 8 +++++
drivers/scsi/ufs/ufs-qcom.c | 40 ++++++++++++++++++++++
drivers/scsi/ufs/ufshcd-pltfrm.c | 33 +++++++++++-------
3 files changed, 68 insertions(+), 13 deletions(-)
diff --git a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
index 5357919..e2f3058 100644
--- a/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
+++ b/Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt
@@ -55,3 +55,11 @@ Example:
clock-names = "core_clk", "ref_clk", "iface_clk";
freq-table-hz = <100000000 200000000>, <0 0>, <0 0>;
};
+
+This is an example to a variant sub-node of ufshc:
+ ufs_variant {
+ compatible = "qcom,ufs_variant";
+ };
+
+This sub-node holds various specific information that is not defined in the
+standard and that may differ between platforms.
diff --git a/drivers/scsi/ufs/ufs-qcom.c b/drivers/scsi/ufs/ufs-qcom.c
index 6671a8e..ad5ffa8 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1018,4 +1018,44 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
};
EXPORT_SYMBOL(ufs_hba_qcom_vops);
+/**
+ * ufs_qcom_probe - probe routine of the driver
+ * @pdev: pointer to Platform device handle
+ *
+ * Always return 0
+ */
+static int ufs_qcom_probe(struct platform_device *pdev)
+{
+ dev_set_drvdata(&pdev->dev, (void *)&ufs_hba_qcom_vops);
+ return 0;
+}
+
+/**
+ * ufs_qcom_remove - set driver_data of the device to NULL
+ * @pdev: pointer to platform device handle
+ *
+ * Always return 0
+ */
+static int ufs_qcom_remove(struct platform_device *pdev)
+{
+ dev_set_drvdata(&pdev->dev, NULL);
+ return 0;
+}
+
+static const struct of_device_id ufs_qcom_of_match[] = {
+ { .compatible = "qcom,ufs_variant"},
+ {},
+};
+
+static struct platform_driver ufs_qcom_pltform = {
+ .probe = ufs_qcom_probe,
+ .remove = ufs_qcom_remove,
+ .driver = {
+ .name = "ufs_qcom",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(ufs_qcom_of_match),
+ },
+};
+module_platform_driver(ufs_qcom_pltform);
+
MODULE_LICENSE("GPL v2");
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 7db9564..7bf2f44 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -36,22 +36,11 @@
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/of.h>
+#include <linux/of_platform.h>
#include "ufshcd.h"
static const struct of_device_id ufs_of_match[];
-static struct ufs_hba_variant_ops *get_variant_ops(struct device *dev)
-{
- if (dev->of_node) {
- const struct of_device_id *match;
-
- match = of_match_node(ufs_of_match, dev->of_node);
- if (match)
- return (struct ufs_hba_variant_ops *)match->data;
- }
-
- return NULL;
-}
static int ufshcd_parse_clock_info(struct ufs_hba *hba)
{
@@ -300,6 +289,9 @@ static int ufshcd_pltfrm_probe(struct platform_device *pdev)
struct resource *mem_res;
int irq, err;
struct device *dev = &pdev->dev;
+ struct device_node *node = pdev->dev.of_node;
+ struct device_node *ufs_variant_node;
+ struct platform_device *ufs_variant_pdev;
mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
mmio_base = devm_ioremap_resource(dev, mem_res);
@@ -321,7 +313,22 @@ static int ufshcd_pltfrm_probe(struct platform_device *pdev)
goto out;
}
- hba->vops = get_variant_ops(&pdev->dev);
+ err = of_platform_populate(node, NULL, NULL, &pdev->dev);
+ if (err)
+ dev_err(&pdev->dev,
+ "%s: of_platform_populate() failed\n", __func__);
+
+ ufs_variant_node = of_get_next_available_child(node, NULL);
+
+ if (!ufs_variant_node) {
+ dev_dbg(&pdev->dev, "failed to find ufs_variant_node child\n");
+ } else {
+ ufs_variant_pdev = of_find_device_by_node(ufs_variant_node);
+
+ if (ufs_variant_pdev)
+ hba->vops = (struct ufs_hba_variant_ops *)
+ dev_get_drvdata(&ufs_variant_pdev->dev);
+ }
err = ufshcd_parse_clock_info(hba);
if (err) {
--
1.8.5.2
--
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