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Message-Id: <1433694425-23478-5-git-send-email-ygardi@codeaurora.org>
Date: Sun, 7 Jun 2015 19:27:04 +0300
From: Yaniv Gardi <ygardi@...eaurora.org>
To: James.Bottomley@...senPartnership.com
Cc: linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
linux-arm-msm@...r.kernel.org, akinobu.mita@...il.com,
santoshsy@...il.com, linux-scsi-owner@...r.kernel.org,
subhashj@...eaurora.org, ygardi@...eaurora.org, pebolle@...cali.nl,
gbroner@...eaurora.org, Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Vinayak Holikatti <vinholikatti@...il.com>,
"James E.J. Bottomley" <JBottomley@...n.com>,
Dolev Raviv <draviv@...eaurora.org>,
Christoph Hellwig <hch@....de>,
Sujit Reddy Thumma <sthumma@...eaurora.org>,
Raviv Shvili <rshvili@...eaurora.org>,
Sahitya Tummala <stummala@...eaurora.org>,
devicetree@...r.kernel.org (open list:OPEN FIRMWARE AND...)
Subject: [PATCH v3 4/4] scsi: ufs: probe and init of variant driver from the platform device
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@...eaurora.org>
---
.../devicetree/bindings/ufs/ufshcd-pltfrm.txt | 8 ++++
drivers/scsi/ufs/ufs-qcom.c | 41 +++++++++++++++++++-
drivers/scsi/ufs/ufshcd-pltfrm.c | 45 +++++++++++++++-------
3 files changed, 80 insertions(+), 14 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..4391f1e 100644
--- a/drivers/scsi/ufs/ufs-qcom.c
+++ b/drivers/scsi/ufs/ufs-qcom.c
@@ -1016,6 +1016,45 @@ static const struct ufs_hba_variant_ops ufs_hba_qcom_vops = {
.suspend = ufs_qcom_suspend,
.resume = ufs_qcom_resume,
};
-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..a3f0a61 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 +313,23 @@ 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) {
+ __module_get(ufs_variant_pdev->dev.driver->owner);
+ hba->vops = dev_get_drvdata(&ufs_variant_pdev->dev);
+ }
+ }
err = ufshcd_parse_clock_info(hba);
if (err) {
@@ -365,9 +373,20 @@ out:
static int ufshcd_pltfrm_remove(struct platform_device *pdev)
{
struct ufs_hba *hba = platform_get_drvdata(pdev);
+ struct device_node *node = pdev->dev.of_node;
+ struct device_node *ufs_variant_node;
+ struct platform_device *ufs_variant_pdev;
+
+ ufs_variant_node = of_get_next_available_child(node, NULL);
+
+ if (!ufs_variant_node)
+ dev_dbg(&pdev->dev, "no ufs_variant_node found\n");
+ else
+ ufs_variant_pdev = of_find_device_by_node(ufs_variant_node);
pm_runtime_get_sync(&(pdev)->dev);
ufshcd_remove(hba);
+ module_put(ufs_variant_pdev->dev.driver->owner);
return 0;
}
--
1.8.5.2
--
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