From mboxrd@z Thu Jan 1 00:00:00 1970 From: Yaniv Gardi Subject: [PATCH v2 4/4] scsi: ufs: probe and init of variant driver from the platform device Date: Wed, 3 Jun 2015 12:37:35 +0300 Message-ID: <1433324255-27510-5-git-send-email-ygardi@codeaurora.org> References: <1433324255-27510-1-git-send-email-ygardi@codeaurora.org> Return-path: In-Reply-To: <1433324255-27510-1-git-send-email-ygardi@codeaurora.org> Sender: linux-scsi-owner@vger.kernel.org To: James.Bottomley@HansenPartnership.com Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-arm-msm@vger.kernel.org, santoshsy@gmail.com, linux-scsi-owner@vger.kernel.org, subhashj@codeaurora.org, ygardi@codeaurora.org, pebolle@tiscali.nl, gbroner@codeaurora.org, Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , Vinayak Holikatti , "James E.J. Bottomley" , Dolev Raviv , Christoph Hellwig , Sujit Reddy Thumma , Raviv Shvili , Sahitya Tummala , "open list:OPEN FIRMWARE AND..." List-Id: linux-arm-msm@vger.kernel.org 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 --- .../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 #include #include +#include #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 -- QUALCOMM ISRAEL, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation