From patchwork Tue Nov 6 14:54:14 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Maxime Ripard X-Patchwork-Id: 10670585 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id C2C6414E2 for ; Tue, 6 Nov 2018 14:54:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B12172A4DC for ; Tue, 6 Nov 2018 14:54:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id A5CD42A4DD; Tue, 6 Nov 2018 14:54:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 343622A4DA for ; Tue, 6 Nov 2018 14:54:41 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2BBF56E378; Tue, 6 Nov 2018 14:54:39 +0000 (UTC) X-Original-To: dri-devel@lists.freedesktop.org Delivered-To: dri-devel@lists.freedesktop.org Received: from mail.bootlin.com (mail.bootlin.com [62.4.15.54]) by gabe.freedesktop.org (Postfix) with ESMTP id DE6416E33E for ; Tue, 6 Nov 2018 14:54:37 +0000 (UTC) Received: by mail.bootlin.com (Postfix, from userid 110) id DD27A20789; Tue, 6 Nov 2018 15:54:36 +0100 (CET) Received: from localhost (unknown [185.94.189.188]) by mail.bootlin.com (Postfix) with ESMTPSA id 98239206A1; Tue, 6 Nov 2018 15:54:26 +0100 (CET) From: Maxime Ripard To: Kishon Vijay Abraham I , Boris Brezillon Subject: [PATCH v2 2/9] phy: Add configuration interface Date: Tue, 6 Nov 2018 15:54:14 +0100 Message-Id: <4d0506aa0a61d234610b42a268a8326d9ea18466.1541516029.git-series.maxime.ripard@bootlin.com> X-Mailer: git-send-email 2.19.1 In-Reply-To: References: MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Rafal Ciepiela , Krzysztof Witos , Maxime Ripard , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Chen-Yu Tsai , Laurent Pinchart , Thomas Petazzoni , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" X-Virus-Scanned: ClamAV using ClamSMTP The phy framework is only allowing to configure the power state of the PHY using the init and power_on hooks, and their power_off and exit counterparts. While it works for most, simple, PHYs supported so far, some more advanced PHYs need some configuration depending on runtime parameters. These PHYs have been supported by a number of means already, often by using ad-hoc drivers in their consumer drivers. That doesn't work too well however, when a consumer device needs to deal with multiple PHYs, or when multiple consumers need to deal with the same PHY (a DSI driver and a CSI driver for example). So we'll add a new interface, through two funtions, phy_validate and phy_configure. The first one will allow to check that a current configuration, for a given mode, is applicable. It will also allow the PHY driver to tune the settings given as parameters as it sees fit. phy_configure will actually apply that configuration in the phy itself. Signed-off-by: Maxime Ripard --- drivers/phy/phy-core.c | 61 ++++++++++++++++++++++++++++++++++++++++++- include/linux/phy/phy.h | 58 ++++++++++++++++++++++++++++++++++++++++- 2 files changed, 119 insertions(+) diff --git a/drivers/phy/phy-core.c b/drivers/phy/phy-core.c index 35fd38c5a4a1..7bd3ed65c708 100644 --- a/drivers/phy/phy-core.c +++ b/drivers/phy/phy-core.c @@ -408,6 +408,67 @@ int phy_calibrate(struct phy *phy) EXPORT_SYMBOL_GPL(phy_calibrate); /** + * phy_configure() - Changes the phy parameters + * @phy: the phy returned by phy_get() + * @opts: New configuration to apply + * + * Used to change the PHY parameters. phy_init() must have been called + * on the phy. The configuration will be applied on the current phy + * mode, that can be changed using phy_set_mode(). + * + * Returns: 0 if successful, an negative error code otherwise + */ +int phy_configure(struct phy *phy, union phy_configure_opts *opts) +{ + int ret; + + if (!phy) + return -EINVAL; + + if (!phy->ops->configure) + return -EOPNOTSUPP; + + mutex_lock(&phy->mutex); + ret = phy->ops->configure(phy, opts); + mutex_unlock(&phy->mutex); + + return ret; +} + +/** + * phy_validate() - Checks the phy parameters + * @phy: the phy returned by phy_get() + * @mode: phy_mode the configuration is applicable to. + * @opts: Configuration to check + * + * Used to check that the current set of parameters can be handled by + * the phy. Implementations are free to tune the parameters passed as + * arguments if needed by some implementation detail or + * constraints. It will not change any actual configuration of the + * PHY, so calling it as many times as deemed fit will have no side + * effect. + * + * Returns: 0 if successful, an negative error code otherwise + */ +int phy_validate(struct phy *phy, enum phy_mode mode, + union phy_configure_opts *opts) +{ + int ret; + + if (!phy) + return -EINVAL; + + if (!phy->ops->validate) + return -EOPNOTSUPP; + + mutex_lock(&phy->mutex); + ret = phy->ops->validate(phy, mode, opts); + mutex_unlock(&phy->mutex); + + return ret; +} + +/** * _of_phy_get() - lookup and obtain a reference to a phy by phandle * @np: device_node for which to get the phy * @index: the index of the phy diff --git a/include/linux/phy/phy.h b/include/linux/phy/phy.h index d5c2ac7369f2..89cf8b685546 100644 --- a/include/linux/phy/phy.h +++ b/include/linux/phy/phy.h @@ -46,6 +46,12 @@ enum phy_mode { }; /** + * union phy_configure_opts - Opaque generic phy configuration + */ +union phy_configure_opts { +}; + +/** * struct phy_ops - set of function pointers for performing phy operations * @init: operation to be performed for initializing phy * @exit: operation to be performed while exiting @@ -62,6 +68,37 @@ struct phy_ops { int (*power_on)(struct phy *phy); int (*power_off)(struct phy *phy); int (*set_mode)(struct phy *phy, enum phy_mode mode); + + /** + * @configure: + * + * Optional. + * + * Used to change the PHY parameters. phy_init() must have + * been called on the phy. + * + * Returns: 0 if successful, an negative error code otherwise + */ + int (*configure)(struct phy *phy, union phy_configure_opts *opts); + + /** + * @validate: + * + * Optional. + * + * Used to check that the current set of parameters can be + * handled by the phy. Implementations are free to tune the + * parameters passed as arguments if needed by some + * implementation detail or constraints. It must not change + * any actual configuration of the PHY, so calling it as many + * times as deemed fit by the consumer must have no side + * effect. + * + * Returns: 0 if the configuration can be applied, an negative + * error code otherwise + */ + int (*validate)(struct phy *phy, enum phy_mode mode, + union phy_configure_opts *opts); int (*reset)(struct phy *phy); int (*calibrate)(struct phy *phy); struct module *owner; @@ -166,6 +203,9 @@ int phy_exit(struct phy *phy); int phy_power_on(struct phy *phy); int phy_power_off(struct phy *phy); int phy_set_mode(struct phy *phy, enum phy_mode mode); +int phy_configure(struct phy *phy, union phy_configure_opts *opts); +int phy_validate(struct phy *phy, enum phy_mode mode, + union phy_configure_opts *opts); static inline enum phy_mode phy_get_mode(struct phy *phy) { return phy->attrs.mode; @@ -305,6 +345,24 @@ static inline int phy_calibrate(struct phy *phy) return -ENOSYS; } +static inline int phy_configure(struct phy *phy, + union phy_configure_opts *opts) +{ + if (!phy) + return 0; + + return -ENOSYS; +} + +static inline int phy_validate(struct phy *phy, enum phy_mode mode, + union phy_configure_opts *opts) +{ + if (!phy) + return 0; + + return -ENOSYS; +} + static inline int phy_get_bus_width(struct phy *phy) { return -ENOSYS;