From mboxrd@z Thu Jan 1 00:00:00 1970 From: Matthias Brugger Subject: [PATCH] spi: spi-omap2-mcspi.c: Add dts for slave device configuration. Date: Tue, 26 Mar 2013 00:00:15 +0100 Message-ID: <1364252415-3613-1-git-send-email-matthias.bgg@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Grant Likely , Rob Herring , Rob Landley , Mark Brown , Daniel Mack , Matthias Brugger , "Enric Balletbo Serra" , "Javier Martinez Canillas" , devicetree-discuss-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org, linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, ezequiel.garcia-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org Return-path: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: spi-devel-general-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-spi.vger.kernel.org TI omap2 mcspi allows the slave devices to configure the behavior of the SPI master. This patch adds device tree support to the existing options. Signed-off-by: Matthias Brugger --- Documentation/devicetree/bindings/spi/omap-spi.txt | 23 ++++++++++++ drivers/spi/spi-omap2-mcspi.c | 41 ++++++++++++++++++++++ 2 files changed, 64 insertions(+) diff --git a/Documentation/devicetree/bindings/spi/omap-spi.txt b/Documentation/devicetree/bindings/spi/omap-spi.txt index 938809c..fef16bf 100644 --- a/Documentation/devicetree/bindings/spi/omap-spi.txt +++ b/Documentation/devicetree/bindings/spi/omap-spi.txt @@ -10,8 +10,20 @@ Required properties: input. The default is D0 as input and D1 as output. +SPI Controller specific data in SPI slave nodes: + +- The spi slave nodes can provide the following information which is used + by the spi controller. + +- ti,spi-cs-per-word: Set chipselect to be toggled on every word send. + +- ti,spi-turbo-mode: Set turbo mode for this device. + + Example: +- SoC Specific Portion: + mcspi1: mcspi@1 { #address-cells = <1>; #size-cells = <0>; @@ -20,3 +32,14 @@ mcspi1: mcspi@1 { ti,spi-num-cs = <4>; }; +- Board Specific Portion: + + spi-device@0 { + #address-cells = <1>; + #size-cells = <1>; + + controller-data { + ti,spi-cs-per-word = <1>; + ti,spi-turbo-mode = <0>; + }; + }; diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c index 893c3d7..1ae5009 100644 --- a/drivers/spi/spi-omap2-mcspi.c +++ b/drivers/spi/spi-omap2-mcspi.c @@ -731,11 +731,47 @@ static u32 omap2_mcspi_calc_divisor(u32 speed_hz) return 15; } +static struct omap2_mcspi_device_config *omap2_mcspi_get_slave_ctrldata( + struct spi_device *spi) +{ + struct omap2_mcspi_device_config *cd; + struct device_node *slave_np, *data_np = NULL; + + slave_np = spi->dev.of_node; + if (!slave_np) { + dev_err(&spi->dev, "device node not found\n"); + return ERR_PTR(-EINVAL); + } + + data_np = of_get_child_by_name(slave_np, "controller-data"); + if (!data_np) { + dev_err(&spi->dev, "child node 'controller-data' not found\n"); + return ERR_PTR(-EINVAL); + } + + cd = kzalloc(sizeof(*cd), GFP_KERNEL); + if (!cd) { + dev_err(&spi->dev, "could not allocate memory for controller data\n"); + of_node_put(data_np); + return ERR_PTR(-ENOMEM); + } + + if (of_get_property(data_np, "ti,spi-cs-per-word", NULL)) + cd->cs_per_word = 1; + + if (of_get_property(data_np, "ti,spi-turbo-mode", NULL)) + cd->turbo_mode = 1; + + of_node_put(data_np); + return cd; +} + /* called only when no transfer is active to this device */ static int omap2_mcspi_setup_transfer(struct spi_device *spi, struct spi_transfer *t) { struct omap2_mcspi_cs *cs = spi->controller_state; + struct omap2_mcspi_device_config *cd = spi->controller_data; struct omap2_mcspi *mcspi; struct spi_master *spi_cntrl; u32 l = 0, div = 0; @@ -745,6 +781,11 @@ static int omap2_mcspi_setup_transfer(struct spi_device *spi, mcspi = spi_master_get_devdata(spi->master); spi_cntrl = mcspi->master; + if (!cd && spi->dev.of_node) { + cd = omap2_mcspi_get_slave_ctrldata(spi); + spi->controller_data = cd; + } + if (t != NULL && t->bits_per_word) word_len = t->bits_per_word; -- 1.7.11.7 ------------------------------------------------------------------------------ Own the Future-Intel® Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d