Re: [PATCH v6 3/3] usb: chipidea: Add support for NPCM

From: Paul Menzel
Date: Sun Oct 15 2023 - 15:19:06 EST

Dear Tomer,


Am 15.10.23 um 19:21 schrieb Tomer Maimon:

On Fri, 13 Oct 2023 at 16:18, Paul Menzel <pmenzel@xxxxxxxxxxxxx> wrote:

Am 13.10.23 um 01:00 schrieb Tomer Maimon:
Add Nuvoton NPCM BMC SoCs support to USB ChipIdea driver.
NPCM SoC include ChipIdea IP block that used for USB device controller

include*s*
“that *is* used” or just “… used for”
Will do

mode.

Please add a line, how you tested this patch.
I don't recall "how you tested the patch" done in the commit message,
I can add it in the cover letter

In my opinion, adding a separate paragraph to the commit message would be best.

Signed-off-by: Tomer Maimon <tmaimon77@xxxxxxxxx>
Acked-by: Peter Chen <peter.chen@xxxxxxxxxx>
---
drivers/usb/chipidea/Kconfig | 4 +
drivers/usb/chipidea/Makefile | 1 +
drivers/usb/chipidea/ci_hdrc_npcm.c | 114 ++++++++++++++++++++++++++++
3 files changed, 119 insertions(+)
create mode 100644 drivers/usb/chipidea/ci_hdrc_npcm.c

diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
index c815824a0b2d..bab45bc62361 100644
--- a/drivers/usb/chipidea/Kconfig
+++ b/drivers/usb/chipidea/Kconfig
@@ -43,6 +43,10 @@ config USB_CHIPIDEA_MSM
tristate "Enable MSM hsusb glue driver" if EXPERT
default USB_CHIPIDEA

+config USB_CHIPIDEA_NPCM
+ tristate "Enable NPCM hsusb glue driver" if EXPERT
+ default USB_CHIPIDEA
+
config USB_CHIPIDEA_IMX
tristate "Enable i.MX USB glue driver" if EXPERT
depends on OF
diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
index 71afeab97e83..718cb24603dd 100644
--- a/drivers/usb/chipidea/Makefile
+++ b/drivers/usb/chipidea/Makefile
@@ -13,6 +13,7 @@ ci_hdrc-$(CONFIG_USB_OTG_FSM) += otg_fsm.o

obj-$(CONFIG_USB_CHIPIDEA_GENERIC) += ci_hdrc_usb2.o
obj-$(CONFIG_USB_CHIPIDEA_MSM) += ci_hdrc_msm.o
+obj-$(CONFIG_USB_CHIPIDEA_NPCM) += ci_hdrc_npcm.o
obj-$(CONFIG_USB_CHIPIDEA_PCI) += ci_hdrc_pci.o
obj-$(CONFIG_USB_CHIPIDEA_IMX) += usbmisc_imx.o ci_hdrc_imx.o
obj-$(CONFIG_USB_CHIPIDEA_TEGRA) += ci_hdrc_tegra.o
diff --git a/drivers/usb/chipidea/ci_hdrc_npcm.c b/drivers/usb/chipidea/ci_hdrc_npcm.c
new file mode 100644
index 000000000000..37b64a3dbd96
--- /dev/null
+++ b/drivers/usb/chipidea/ci_hdrc_npcm.c
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2023 Nuvoton Technology corporation.
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/usb/chipidea.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/reset-controller.h>
+#include <linux/of.h>
+
+#include "ci.h"
+
+struct npcm_udc_data {
+ struct platform_device *ci;
+ struct clk *core_clk;
+ struct ci_hdrc_platform_data pdata;
+};
+
+static int npcm_udc_notify_event(struct ci_hdrc *ci, unsigned event)
+{
+ struct device *dev = ci->dev->parent;
+
+ switch (event) {
+ case CI_HDRC_CONTROLLER_RESET_EVENT:
+ /* clear all mode bits */
+ hw_write(ci, OP_USBMODE, 0xffffffff, 0x0);
+ break;
+ default:
+ dev_dbg(dev, "unknown ci_hdrc event\n");

Please print it out.
Do you mean instead dev_dbg to use dev_info? in that case, each event
that didnt handled will cause a print.

Sorry for not being clear. I meant print out `event`.

+ break;
+ }
+
+ return 0;
+}
+
+static int npcm_udc_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct npcm_udc_data *ci;
+ struct platform_device *plat_ci;
+ struct device *dev = &pdev->dev;
+
+ ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
+ if (!ci)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, ci);
+
+ ci->core_clk = devm_clk_get_optional(dev, NULL);
+ if (IS_ERR(ci->core_clk))
+ return PTR_ERR(ci->core_clk);
+
+ ret = clk_prepare_enable(ci->core_clk);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to enable the clock: %d\n", ret);
+
+ ci->pdata.name = dev_name(dev);
+ ci->pdata.capoffset = DEF_CAPOFFSET;
+ ci->pdata.flags = CI_HDRC_REQUIRES_ALIGNED_DMA |
+ CI_HDRC_FORCE_VBUS_ACTIVE_ALWAYS;
+ ci->pdata.phy_mode = USBPHY_INTERFACE_MODE_UTMI;
+ ci->pdata.notify_event = npcm_udc_notify_event;
+
+ plat_ci = ci_hdrc_add_device(dev, pdev->resource, pdev->num_resources,
+ &ci->pdata);
+ if (IS_ERR(plat_ci)) {
+ ret = PTR_ERR(plat_ci);
+ dev_err(dev, "failed to register HDRC NPCM device: %d\n", ret);
+ goto clk_err;
+ }
+
+ pm_runtime_no_callbacks(dev);
+ pm_runtime_enable(dev);
+
+ return 0;
+
+clk_err:
+ clk_disable_unprepare(ci->core_clk);
+ return ret;
+}
+
+static int npcm_udc_remove(struct platform_device *pdev)
+{
+ struct npcm_udc_data *ci = platform_get_drvdata(pdev);
+
+ pm_runtime_disable(&pdev->dev);
+ ci_hdrc_remove_device(ci->ci);
+ clk_disable_unprepare(ci->core_clk);
+
+ return 0;
+}
+
+static const struct of_device_id npcm_udc_dt_match[] = {
+ { .compatible = "nuvoton,npcm750-udc", },
+ { .compatible = "nuvoton,npcm845-udc", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, npcm_udc_dt_match);
+
+static struct platform_driver npcm_udc_driver = {
+ .probe = npcm_udc_probe,
+ .remove = npcm_udc_remove,
+ .driver = {
+ .name = "npcm_udc",
+ .of_match_table = npcm_udc_dt_match,
+ },
+};
+
+module_platform_driver(npcm_udc_driver);
+
+MODULE_DESCRIPTION("NPCM USB device controller driver");
+MODULE_AUTHOR("Tomer Maimon <tomer.maimon@xxxxxxxxxxx>");

Should that address also be recorded as the patch author?
I prefer to use this e-mail since this is my main e-mail.

Alright, if it’s fine with your employer that’s great.

+MODULE_LICENSE("GPL v2");


Kind regards,

Paul