From 4b153a2137c5d2914794c8944d78c731c1b0ae9d Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Thu, 10 Jul 2014 10:30:20 +0200 Subject: spi: xilinx: Use pdev->id instead of pdev->dev.id for the SPI bus number The Xilinx SPI driver initializes the bus_num field of the SPI master to pdev->dev.id. pdev->dev.id is always 0 for platform devices which causes bus number conflicts for the SPI controller when creating multiple device instances of the driver. Instead use pdev->id which will have the assignt platform device id. If the device is instantiated via devicetree pdev->id is -1 which will cause the SPI core to dynamically assign a id (or use the id defined via a alias in the devicetree). Signed-off-by: Lars-Peter Clausen Signed-off-by: Mark Brown --- drivers/spi/spi-xilinx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers') diff --git a/drivers/spi/spi-xilinx.c b/drivers/spi/spi-xilinx.c index a3b0b9944bf0..4d8efb16573d 100644 --- a/drivers/spi/spi-xilinx.c +++ b/drivers/spi/spi-xilinx.c @@ -369,7 +369,7 @@ static int xilinx_spi_probe(struct platform_device *pdev) goto put_master; } - master->bus_num = pdev->dev.id; + master->bus_num = pdev->id; master->num_chipselect = num_cs; master->dev.of_node = pdev->dev.of_node; -- cgit v1.2.3 From e2689b946a42acaad9ba94bf3a0bf4caa6509b9e Mon Sep 17 00:00:00 2001 From: Javier Martinez Canillas Date: Wed, 16 Jul 2014 17:19:07 +0200 Subject: spi: s3c64xx: Revert "spi: s3c64xx: Added provision for dedicated cs pin" This reverts commit 3146beec21b64f4551fcf0ac148381d54dc41b1b. This commit resulted in a DT backward compatibility breakage. Some devices use the native chip select (CS) instead of a GPIO pin to drive the CS line. But the SPI driver made it mandatory to specify a GPIO pin in the SPI device node controller-data. So, using the built-in CS was not possible with the driver. Commit 3146bee tried to fix that by adding a "cs-gpio" property which could be defined in the SPI device node to make the driver request the GPIO from the controller-data node. Unfortunately that changed the old DT binding semantics since now it's mandatory to have the "cs-gpio" property defined in the SPI device node in order to use a GPIO pin to drive the CS. As an example, a SPI device was defined before the commit with: spi@12d20000 { slave-node@0 { controller-data { cs-gpio = <&gpb1 2 0>; } } } and after the commit, the following DTS snippet must be used: spi@12d20000 { cs-gpio; slave-node@0 { controller-data { cs-gpio = <&gpb1 2 0>; } } } So, after commit 3146bee the driver does not look for the GPIO by default and it only looks for it if the top level "cs-gpio" property is defined while the default used to be the opposite. To always request the GPIO defined in the controller-data node. This means that old FDT that of course didn't have this added "cs-gpio" DT property in the SPI node broke after this change. The offending commit can't be reverted cleanly since more than a year have passed and other changes were made in the meantime but this patch partially reverts the driver to it's original state so old FDT can work again. This patch will break Device Trees that were relying on the new behavior of course but the patch should be reverted because: a) There aren't DTS in mainline that use this new property. b) They were relying on a behavior that broke DT compatibility. c) The new binding is awkard, needing two properties with the same name (cs-gpio) on different nodes is confusing at least. d) The new property was not added to the DT binding doc: Documentation/devicetree/bindings/spi/spi-samsung.txt Signed-off-by: Javier Martinez Canillas Reviewed-by: Tomasz Figa Signed-off-by: Mark Brown --- drivers/spi/spi-s3c64xx.c | 37 +++++++++++-------------------------- 1 file changed, 11 insertions(+), 26 deletions(-) (limited to 'drivers') diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 75a56968b14c..b1e26f00cd05 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -197,7 +197,6 @@ struct s3c64xx_spi_driver_data { struct s3c64xx_spi_dma_data tx_dma; struct s3c64xx_spi_port_config *port_conf; unsigned int port_id; - bool cs_gpio; }; static void flush_fifo(struct s3c64xx_spi_driver_data *sdd) @@ -754,10 +753,8 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata( { struct s3c64xx_spi_csinfo *cs; struct device_node *slave_np, *data_np = NULL; - struct s3c64xx_spi_driver_data *sdd; u32 fb_delay = 0; - sdd = spi_master_get_devdata(spi->master); slave_np = spi->dev.of_node; if (!slave_np) { dev_err(&spi->dev, "device node not found\n"); @@ -776,10 +773,7 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata( return ERR_PTR(-ENOMEM); } - /* The CS line is asserted/deasserted by the gpio pin */ - if (sdd->cs_gpio) - cs->line = of_get_named_gpio(data_np, "cs-gpio", 0); - + cs->line = of_get_named_gpio(data_np, "cs-gpio", 0); if (!gpio_is_valid(cs->line)) { dev_err(&spi->dev, "chip select gpio is not specified or invalid\n"); kfree(cs); @@ -818,20 +812,17 @@ static int s3c64xx_spi_setup(struct spi_device *spi) } if (!spi_get_ctldata(spi)) { - /* Request gpio only if cs line is asserted by gpio pins */ - if (sdd->cs_gpio) { - err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH, - dev_name(&spi->dev)); - if (err) { - dev_err(&spi->dev, - "Failed to get /CS gpio [%d]: %d\n", - cs->line, err); - goto err_gpio_req; - } - - spi->cs_gpio = cs->line; + err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH, + dev_name(&spi->dev)); + if (err) { + dev_err(&spi->dev, + "Failed to get /CS gpio [%d]: %d\n", + cs->line, err); + goto err_gpio_req; } + spi->cs_gpio = cs->line; + spi_set_ctldata(spi, cs); } @@ -897,10 +888,8 @@ err_gpio_req: static void s3c64xx_spi_cleanup(struct spi_device *spi) { struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi); - struct s3c64xx_spi_driver_data *sdd; - sdd = spi_master_get_devdata(spi->master); - if (spi->cs_gpio) { + if (cs) { gpio_free(spi->cs_gpio); if (spi->dev.of_node) kfree(cs); @@ -1075,11 +1064,7 @@ static int s3c64xx_spi_probe(struct platform_device *pdev) sdd->cntrlr_info = sci; sdd->pdev = pdev; sdd->sfr_start = mem_res->start; - sdd->cs_gpio = true; if (pdev->dev.of_node) { - if (!of_find_property(pdev->dev.of_node, "cs-gpio", NULL)) - sdd->cs_gpio = false; - ret = of_alias_get_id(pdev->dev.of_node, "spi"); if (ret < 0) { dev_err(&pdev->dev, "failed to get alias id, errno %d\n", -- cgit v1.2.3 From 306972cedfdedc662dd8e32a6397d0e29f2ac90e Mon Sep 17 00:00:00 2001 From: Naveen Krishna Chatradhi Date: Wed, 16 Jul 2014 17:19:08 +0200 Subject: spi: s3c64xx: use the generic SPI "cs-gpios" property The s3c64xx SPI driver uses a custom DT binding to specify the GPIO used to drive the chip select (CS) line instead of using the generic "cs-gpios" property already defined in: Documentation/devicetree/bindings/spi/spi-bus.txt. It's unfortunate that drivers are not using standard bindings and creating custom ones instead but in most cases this can't be changed without breaking Device Tree backward compatibility. But in the case of this driver, its DT binding has been broken for more than a year. Since after commit (dated June, 21 2013): 3146bee ("spi: s3c64xx: Added provision for dedicated cs pin") DT backward compatibility was broken and nobody noticed until now when the commit was reverted. So it seems to be safe to change the binding to use the standard SPI "cs-gpios" property instead of using a custom one just for this driver. This patch also allows boards that don't use a GPIO pin for the CS to work with the driver since the SPI core will take care of setting spi->cs_gpio to -ENOENT if a board wants to use the built in CS instead of a GPIO as explained in the SPI bus DT binding: Documentation/devicetree/bindings/spi/spi-bus.txt. For non-DT platforms, spi->cs_gpio will be set to -ENOENT as well unless they specify a GPIO pin in their platform data. So both native and GPIO chip select is also supported for legacy boards. The above use case was what motivated commit 3146bee which broke the DT binding backward compatibility in the first place. Signed-off-by: Naveen Krishna Chatradhi [javier.martinez@collabora.co.uk: split changes and improve commit message] Signed-off-by: Javier Martinez Canillas Reviewed-by: Tomasz Figa Signed-off-by: Mark Brown --- drivers/spi/spi-s3c64xx.c | 49 ++++++++++++++++++++++++++++------------------- 1 file changed, 29 insertions(+), 20 deletions(-) (limited to 'drivers') diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index b1e26f00cd05..1c36311935d7 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -773,14 +773,6 @@ static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata( return ERR_PTR(-ENOMEM); } - cs->line = of_get_named_gpio(data_np, "cs-gpio", 0); - if (!gpio_is_valid(cs->line)) { - dev_err(&spi->dev, "chip select gpio is not specified or invalid\n"); - kfree(cs); - of_node_put(data_np); - return ERR_PTR(-EINVAL); - } - of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay); cs->fb_delay = fb_delay; of_node_put(data_np); @@ -801,9 +793,16 @@ static int s3c64xx_spi_setup(struct spi_device *spi) int err; sdd = spi_master_get_devdata(spi->master); - if (!cs && spi->dev.of_node) { + if (spi->dev.of_node) { cs = s3c64xx_get_slave_ctrldata(spi); spi->controller_data = cs; + } else if (cs) { + /* On non-DT platforms the SPI core will set spi->cs_gpio + * to -ENOENT. The GPIO pin used to drive the chip select + * is defined by using platform data so spi->cs_gpio value + * has to be override to have the proper GPIO pin number. + */ + spi->cs_gpio = cs->line; } if (IS_ERR_OR_NULL(cs)) { @@ -812,17 +811,17 @@ static int s3c64xx_spi_setup(struct spi_device *spi) } if (!spi_get_ctldata(spi)) { - err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH, - dev_name(&spi->dev)); - if (err) { - dev_err(&spi->dev, - "Failed to get /CS gpio [%d]: %d\n", - cs->line, err); - goto err_gpio_req; + if (gpio_is_valid(spi->cs_gpio)) { + err = gpio_request_one(spi->cs_gpio, GPIOF_OUT_INIT_HIGH, + dev_name(&spi->dev)); + if (err) { + dev_err(&spi->dev, + "Failed to get /CS gpio [%d]: %d\n", + spi->cs_gpio, err); + goto err_gpio_req; + } } - spi->cs_gpio = cs->line; - spi_set_ctldata(spi, cs); } @@ -875,7 +874,8 @@ setup_exit: /* setup() returns with device de-selected */ writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL); - gpio_free(cs->line); + if (gpio_is_valid(spi->cs_gpio)) + gpio_free(spi->cs_gpio); spi_set_ctldata(spi, NULL); err_gpio_req: @@ -889,11 +889,20 @@ static void s3c64xx_spi_cleanup(struct spi_device *spi) { struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi); - if (cs) { + if (gpio_is_valid(spi->cs_gpio)) { gpio_free(spi->cs_gpio); if (spi->dev.of_node) kfree(cs); + else { + /* On non-DT platforms, the SPI core sets + * spi->cs_gpio to -ENOENT and .setup() + * overrides it with the GPIO pin value + * passed using platform data. + */ + spi->cs_gpio = -ENOENT; + } } + spi_set_ctldata(spi, NULL); } -- cgit v1.2.3