From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Mon, 16 Dec 2024 14:04:14 +0100 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by lore.white.stw.pengutronix.de with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1tNAlh-008pLD-2Z for lore@lore.pengutronix.de; Mon, 16 Dec 2024 14:04:14 +0100 Received: from bombadil.infradead.org ([2607:7c80:54:3::133]) by metis.whiteo.stw.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1tNAlg-0005Az-H8 for lore@pengutronix.de; Mon, 16 Dec 2024 14:04:14 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:To:From:Reply-To: Cc:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=/eFpTYszdUTututDb7w25Ck037Nhex4cUmnldhegz5g=; b=S5Y6c+4RXDCO+hKVN5Kwz3cC85 Pnr1WO5fq7sJsoCv2acJVSBVM9wzAYZ6Y4RlnyWN4JxunkPvbtiKuCSWkdQphlzBOFK8wX71pRHPu 1FkYglJFLhP/KIQbWw0tBFmuGWGl2FXaSK4T57I5bb7UYXMOmywTu5gGP/UVSC0gtLUKxPBBImFXi VfhlZBLKIlyxHu3CFNJ3bWRT2EQJ+jZ6YYjkccOI1BxZUVKu0g9LJIVFU7MmxGljufWokjOrPtSPF YNXa1O56Vy4d7plAyM3IAowMcKgUbg6eovEH8DnHvN8PPL57aupzHhXWuFR9OCqawLgdjumPC6NI8 7gc0bVXg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tNAlD-0000000A21X-1Kiy; Mon, 16 Dec 2024 13:03:43 +0000 Received: from metis.whiteo.stw.pengutronix.de ([2a0a:edc0:2:b01:1d::104]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tNAl6-0000000A1uy-2Zp1 for barebox@lists.infradead.org; Mon, 16 Dec 2024 13:03:39 +0000 Received: from dude02.red.stw.pengutronix.de ([2a0a:edc0:0:1101:1d::28]) by metis.whiteo.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1tNAl3-0004cI-Kq for barebox@lists.infradead.org; Mon, 16 Dec 2024 14:03:33 +0100 From: Marco Felsch To: barebox@lists.infradead.org Date: Mon, 16 Dec 2024 14:03:22 +0100 Message-Id: <20241216130324.1592755-10-m.felsch@pengutronix.de> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20241216130324.1592755-1-m.felsch@pengutronix.de> References: <20241216130324.1592755-1-m.felsch@pengutronix.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241216_050336_702870_F9FB0A52 X-CRM114-Status: GOOD ( 14.89 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "barebox" X-SA-Exim-Connect-IP: 2607:7c80:54:3::133 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.whiteo.stw.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-5.0 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH v2 10/12] spi: add support for spi_controller::set_cs_timing X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.whiteo.stw.pengutronix.de) Import the spi_controller set_cs_timing() hook to make it easier to port Linux spi drivers. Signed-off-by: Marco Felsch --- Changelog: v2: - add spi_set_cs_timing() drivers/spi/spi.c | 20 ++++++++++++++++++++ include/spi/spi.h | 12 ++++++++++++ 2 files changed, 32 insertions(+) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 78569301776f..425c35759045 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -34,6 +34,22 @@ struct boardinfo { static LIST_HEAD(board_list); static LIST_HEAD(spi_controller_list); +/** + * spi_set_cs_timing - configure CS setup, hold, and inactive delays + * @spi: the device that requires specific CS timing configuration + * + * Return: zero on success, else a negative error code. + */ +static int spi_set_cs_timing(struct spi_device *spi) +{ + int status = 0; + + if (spi->controller->set_cs_timing && !spi->cs_gpiod) + status = spi->controller->set_cs_timing(spi); + + return status; +} + /** * spi_new_device - instantiate one new SPI device * @master: Controller to which device is connected @@ -101,6 +117,10 @@ struct spi_device *spi_new_device(struct spi_controller *ctrl, goto fail; } + status = spi_set_cs_timing(proxy); + if (status) + goto fail; + status = register_device(&proxy->dev); if (status) goto fail; diff --git a/include/spi/spi.h b/include/spi/spi.h index a8bbf55e0a5a..106cca664068 100644 --- a/include/spi/spi.h +++ b/include/spi/spi.h @@ -179,6 +179,9 @@ static inline void spi_set_ctldata(struct spi_device *spi, void *state) * must fail if an unrecognized or unsupported mode is requested. * It's always safe to call this unless transfers are pending on * the device whose settings are being modified. + * @set_cs_timing: optional hook for SPI devices to request SPI master + * controller for configuring specific CS setup time, hold time and inactive + * delay interms of clock counts * @transfer: adds a message to the controller's transfer queue. * @cleanup: frees controller-specific state * @cs_gpiods: Array of GPIO descriptors to use as chip select lines; one per CS @@ -249,6 +252,15 @@ struct spi_controller { /* setup mode and clock, etc (spi driver may call many times) */ int (*setup)(struct spi_device *spi); + /* + * set_cs_timing() method is for SPI controllers that supports + * configuring CS timing. + * + * This hook allows SPI client drivers to request SPI controllers + * to configure specific CS timing through spi_set_cs_timing(). + */ + int (*set_cs_timing)(struct spi_device *spi); + /* bidirectional bulk transfers * * + The transfer() method may not sleep; its main role is -- 2.39.5