From patchwork Mon Mar 13 16:50:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Francesco Dolcini X-Patchwork-Id: 662972 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73367C6FD1F for ; Mon, 13 Mar 2023 16:56:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231138AbjCMQ4s (ORCPT ); Mon, 13 Mar 2023 12:56:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51322 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230425AbjCMQ4r (ORCPT ); Mon, 13 Mar 2023 12:56:47 -0400 X-Greylist: delayed 341 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Mon, 13 Mar 2023 09:56:30 PDT Received: from mail11.truemail.it (mail11.truemail.it [IPv6:2001:4b7e:0:8::81]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E7BB47043D; Mon, 13 Mar 2023 09:56:28 -0700 (PDT) Received: from francesco-nb.pivistrello.it (93-49-2-63.ip317.fastwebnet.it [93.49.2.63]) by mail11.truemail.it (Postfix) with ESMTPA id 6FDAB21E2B; Mon, 13 Mar 2023 17:50:45 +0100 (CET) From: Francesco Dolcini To: linux-usb@vger.kernel.org Cc: Emanuele Ghidoli , linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Francesco Dolcini Subject: [PATCH v1 3/3] usb: misc: usb3503: support usb3803 and bypass mode Date: Mon, 13 Mar 2023 17:50:39 +0100 Message-Id: <20230313165039.255579-4-francesco@dolcini.it> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230313165039.255579-1-francesco@dolcini.it> References: <20230313165039.255579-1-francesco@dolcini.it> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org From: Emanuele Ghidoli Add support for USB3803 and bypass mode, with this change is also possible to move the component out of bypass mode. In bypass mode the downstream port 3 is connected to the upstream port with low switch resistance R_on. Controlling mode of operations: | RESET_N | BYPASS_N | Mode | -------------------------------- | 0 | 0 | standby | | 1 | 0 | bypass | | 1 | 1 | hub | Datasheet: https://ww1.microchip.com/downloads/aemDocuments/documents/UNG/ProductDocuments/DataSheets/00001691D.pdf Signed-off-by: Emanuele Ghidoli Signed-off-by: Francesco Dolcini --- drivers/usb/misc/usb3503.c | 22 +++++++++++++++++++++- include/linux/platform_data/usb3503.h | 1 + 2 files changed, 22 insertions(+), 1 deletion(-) diff --git a/drivers/usb/misc/usb3503.c b/drivers/usb/misc/usb3503.c index 3044db9fd8aa..c6cfd1edaf76 100644 --- a/drivers/usb/misc/usb3503.c +++ b/drivers/usb/misc/usb3503.c @@ -46,6 +46,7 @@ struct usb3503 { struct device *dev; struct clk *clk; u8 port_off_mask; + struct gpio_desc *bypass; struct gpio_desc *intn; struct gpio_desc *reset; struct gpio_desc *connect; @@ -109,18 +110,25 @@ static int usb3503_connect(struct usb3503 *hub) static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode) { struct device *dev = hub->dev; - int rst, conn; + int rst, bypass, conn; switch (mode) { case USB3503_MODE_HUB: conn = 1; rst = 0; + bypass = 0; break; case USB3503_MODE_STANDBY: conn = 0; rst = 1; + bypass = 1; dev_info(dev, "switched to STANDBY mode\n"); break; + case USB3503_MODE_BYPASS: + conn = 0; + rst = 0; + bypass = 1; + break; default: dev_err(dev, "unknown mode is requested\n"); return -EINVAL; @@ -132,6 +140,9 @@ static int usb3503_switch_mode(struct usb3503 *hub, enum usb3503_mode mode) if (hub->reset) gpiod_set_value_cansleep(hub->reset, rst); + if (hub->bypass) + gpiod_set_value_cansleep(hub->bypass, bypass); + if (conn) { /* Wait T_HUBINIT == 4ms for hub logic to stabilize */ usleep_range(4000, 10000); @@ -247,6 +258,14 @@ static int usb3503_probe(struct usb3503 *hub) if (hub->connect) gpiod_set_consumer_name(hub->connect, "usb3503 connect"); + hub->bypass = devm_gpiod_get_optional(dev, "bypass", GPIOD_OUT_HIGH); + if (IS_ERR(hub->bypass)) { + err = PTR_ERR(hub->bypass); + goto err_clk; + } + if (hub->bypass) + gpiod_set_consumer_name(hub->bypass, "usb3503 bypass"); + hub->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); if (IS_ERR(hub->reset)) { err = PTR_ERR(hub->reset); @@ -382,6 +401,7 @@ MODULE_DEVICE_TABLE(i2c, usb3503_id); static const struct of_device_id usb3503_of_match[] = { { .compatible = "smsc,usb3503", }, { .compatible = "smsc,usb3503a", }, + { .compatible = "smsc,usb3803", }, {}, }; MODULE_DEVICE_TABLE(of, usb3503_of_match); diff --git a/include/linux/platform_data/usb3503.h b/include/linux/platform_data/usb3503.h index d01ef97ddf36..f3c942f396f8 100644 --- a/include/linux/platform_data/usb3503.h +++ b/include/linux/platform_data/usb3503.h @@ -12,6 +12,7 @@ enum usb3503_mode { USB3503_MODE_UNKNOWN, USB3503_MODE_HUB, USB3503_MODE_STANDBY, + USB3503_MODE_BYPASS, }; struct usb3503_platform_data {