From patchwork Fri Aug 1 16:40:32 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Grygorii Strashko X-Patchwork-Id: 4663711 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 04DA8C0338 for ; Fri, 1 Aug 2014 15:58:04 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 038CD201CE for ; Fri, 1 Aug 2014 15:58:03 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 553192020F for ; Fri, 1 Aug 2014 15:58:01 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1XDFBc-0005y0-LY; Fri, 01 Aug 2014 15:56:05 +0000 Received: from comal.ext.ti.com ([198.47.26.152]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XDFBU-0005r2-Gj for linux-arm-kernel@lists.infradead.org; Fri, 01 Aug 2014 15:55:57 +0000 Received: from dflxv15.itg.ti.com ([128.247.5.124]) by comal.ext.ti.com (8.13.7/8.13.7) with ESMTP id s71FtTq3018589; Fri, 1 Aug 2014 10:55:29 -0500 Received: from DLEE71.ent.ti.com (dlee71.ent.ti.com [157.170.170.114]) by dflxv15.itg.ti.com (8.14.3/8.13.8) with ESMTP id s71FtSIo006242; Fri, 1 Aug 2014 10:55:28 -0500 Received: from dlep33.itg.ti.com (157.170.170.75) by DLEE71.ent.ti.com (157.170.170.114) with Microsoft SMTP Server id 14.3.174.1; Fri, 1 Aug 2014 10:55:28 -0500 Received: from localhost (dlep60.itg.ti.com [157.170.170.21]) by dlep33.itg.ti.com (8.14.3/8.13.8) with ESMTP id s71FtQKk023589; Fri, 1 Aug 2014 10:55:27 -0500 From: Grygorii Strashko To: , Mark Brown , Subject: [PATCH v2 1/2] spi: davinci: add support to configure gpio cs through dt Date: Fri, 1 Aug 2014 19:40:32 +0300 Message-ID: <1406911233-18999-2-git-send-email-grygorii.strashko@ti.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1406911233-18999-1-git-send-email-grygorii.strashko@ti.com> References: <1406911233-18999-1-git-send-email-grygorii.strashko@ti.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140801_085556_846134_893F497D X-CRM114-Status: GOOD ( 18.28 ) X-Spam-Score: -5.7 (-----) Cc: devicetree@vger.kernel.org, davinci-linux-open-source@linux.davincidsp.com, Grygorii Strashko , Ian Campbell , Rob Herring , Murali Karicheri , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-2.6 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Murali Karicheri Currently driver supports only configuration of GPIO CS through platform data. This patch enhances the driver to configure GPIO CS through DT. Also update the DT binding documentation to reflect the availability of cs-gpios. Signed-off-by: Murali Karicheri Signed-off-by: Grygorii Strashko --- .../devicetree/bindings/spi/spi-davinci.txt | 9 ++- drivers/spi/spi-davinci.c | 64 +++++++++++++++++--- 2 files changed, 64 insertions(+), 9 deletions(-) diff --git a/Documentation/devicetree/bindings/spi/spi-davinci.txt b/Documentation/devicetree/bindings/spi/spi-davinci.txt index 6d0ac8d..f80887b 100644 --- a/Documentation/devicetree/bindings/spi/spi-davinci.txt +++ b/Documentation/devicetree/bindings/spi/spi-davinci.txt @@ -8,7 +8,8 @@ Required properties: - "ti,dm6441-spi" for SPI used similar to that on DM644x SoC family - "ti,da830-spi" for SPI used similar to that on DA8xx SoC family - reg: Offset and length of SPI controller register space -- num-cs: Number of chip selects +- num-cs: Number of chip selects. This includes internal as well as + GPIO chip selects. - ti,davinci-spi-intr-line: interrupt line used to connect the SPI IP to the interrupt controller within the SoC. Possible values are 0 and 1. Manual says one of the two possible interrupt @@ -17,6 +18,12 @@ Required properties: - interrupts: interrupt number mapped to CPU. - clocks: spi clk phandle +Optional: +- cs-gpios: gpio chip selects + For example to have 3 internal CS and 2 GPIO CS, user could define + cs-gpios = <0>, <0>, <0>, <&gpio1 30 0>, <&gpio1 31 0>; + where first three are internal CS and last two are GPIO CS. + Example of a NOR flash slave device (n25q032) connected to DaVinci SPI controller device over the SPI bus. diff --git a/drivers/spi/spi-davinci.c b/drivers/spi/spi-davinci.c index 2477af4..ac4414e0 100644 --- a/drivers/spi/spi-davinci.c +++ b/drivers/spi/spi-davinci.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include #include @@ -207,17 +208,28 @@ static inline void clear_io_bits(void __iomem *addr, u32 bits) static void davinci_spi_chipselect(struct spi_device *spi, int value) { struct davinci_spi *dspi; + struct device_node *np = spi->dev.of_node; struct davinci_spi_platform_data *pdata; + struct spi_master *master = spi->master; u8 chip_sel = spi->chip_select; u16 spidat1 = CS_DEFAULT; bool gpio_chipsel = false; + int gpio; dspi = spi_master_get_devdata(spi->master); pdata = &dspi->pdata; - if (pdata->chip_sel && chip_sel < pdata->num_chipselect && - pdata->chip_sel[chip_sel] != SPI_INTERN_CS) + if (np && master->cs_gpios != NULL && spi->cs_gpio >= 0) { + /* SPI core parse and update master->cs_gpio */ gpio_chipsel = true; + gpio = spi->cs_gpio; + } else if (pdata->chip_sel && + chip_sel < pdata->num_chipselect && + pdata->chip_sel[chip_sel] != SPI_INTERN_CS) { + /* platform data defines chip_sel */ + gpio_chipsel = true; + gpio = pdata->chip_sel[chip_sel]; + } /* * Board specific chip select logic decides the polarity and cs @@ -225,9 +237,9 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value) */ if (gpio_chipsel) { if (value == BITBANG_CS_ACTIVE) - gpio_set_value(pdata->chip_sel[chip_sel], 0); + gpio_set_value(gpio, 0); else - gpio_set_value(pdata->chip_sel[chip_sel], 1); + gpio_set_value(gpio, 1); } else { if (value == BITBANG_CS_ACTIVE) { spidat1 |= SPIDAT1_CSHOLD_MASK; @@ -390,17 +402,41 @@ static int davinci_spi_setup(struct spi_device *spi) int retval = 0; struct davinci_spi *dspi; struct davinci_spi_platform_data *pdata; + struct spi_master *master = spi->master; + struct device_node *np = spi->dev.of_node; + bool internal_cs = true; dspi = spi_master_get_devdata(spi->master); pdata = &dspi->pdata; if (!(spi->mode & SPI_NO_CS)) { - if ((pdata->chip_sel == NULL) || - (pdata->chip_sel[spi->chip_select] == SPI_INTERN_CS)) - set_io_bits(dspi->base + SPIPC0, 1 << spi->chip_select); - + if (np && (master->cs_gpios != NULL) && (spi->cs_gpio >= 0)) { + unsigned long flags; + + flags = GPIOF_DIR_OUT; + if (spi->mode & SPI_CS_HIGH) + flags |= GPIOF_INIT_LOW; + else + flags |= GPIOF_INIT_HIGH; + retval = gpio_request_one(spi->cs_gpio, + flags, dev_name(&spi->dev)); + if (retval) { + dev_err(&spi->dev, + "GPIO %d request failed (%d)\n", + spi->cs_gpio, retval); + return retval; + } + internal_cs = false; + } else if (pdata->chip_sel && + spi->chip_select < pdata->num_chipselect && + pdata->chip_sel[spi->chip_select] != SPI_INTERN_CS) { + internal_cs = false; + } } + if (internal_cs) + set_io_bits(dspi->base + SPIPC0, 1 << spi->chip_select); + if (spi->mode & SPI_READY) set_io_bits(dspi->base + SPIPC0, SPIPC0_SPIENA_MASK); @@ -412,6 +448,15 @@ static int davinci_spi_setup(struct spi_device *spi) return retval; } +static void davinci_spi_cleanup(struct spi_device *spi) +{ + struct spi_master *master = spi->master; + struct device_node *np = spi->dev.of_node; + + if (np && (master->cs_gpios != NULL) && (spi->cs_gpio >= 0)) + gpio_free(spi->cs_gpio); +} + static int davinci_spi_check_error(struct davinci_spi *dspi, int int_status) { struct device *sdev = dspi->bitbang.master->dev.parent; @@ -810,6 +855,8 @@ static int spi_davinci_get_pdata(struct platform_device *pdev, /* * default num_cs is 1 and all chipsel are internal to the chip + * indicated by chip_sel being NULL or cs_gpios being NULL or + * set to -ENOENT. num-cs includes internal as well as gpios. * indicated by chip_sel being NULL. GPIO based CS is not * supported yet in DT bindings. */ @@ -921,6 +968,7 @@ static int davinci_spi_probe(struct platform_device *pdev) master->num_chipselect = pdata->num_chipselect; master->bits_per_word_mask = SPI_BPW_RANGE_MASK(2, 16); master->setup = davinci_spi_setup; + master->cleanup = davinci_spi_cleanup; dspi->bitbang.chipselect = davinci_spi_chipselect; dspi->bitbang.setup_transfer = davinci_spi_setup_transfer;