diff options
Diffstat (limited to 'target/linux/brcm63xx/patches-3.18/001-spi-spi-gpio-Add-dt-support-for-a-single-device-with.patch')
| -rw-r--r-- | target/linux/brcm63xx/patches-3.18/001-spi-spi-gpio-Add-dt-support-for-a-single-device-with.patch | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/target/linux/brcm63xx/patches-3.18/001-spi-spi-gpio-Add-dt-support-for-a-single-device-with.patch b/target/linux/brcm63xx/patches-3.18/001-spi-spi-gpio-Add-dt-support-for-a-single-device-with.patch new file mode 100644 index 0000000000..437448f677 --- /dev/null +++ b/target/linux/brcm63xx/patches-3.18/001-spi-spi-gpio-Add-dt-support-for-a-single-device-with.patch @@ -0,0 +1,91 @@ +From d1d81802522ade84128a2c66c0d500e372474dca Mon Sep 17 00:00:00 2001 +From: Torsten Fleischer <torfl6749@gmail.com> +Date: Mon, 3 Nov 2014 17:17:55 +0100 +Subject: [PATCH] spi: spi-gpio: Add dt support for a single device with no + chip select + +In order to describe a single slave device that has no chip select line +the 'num-chipselects' property has to be <0> and the 'cs-gpios' property +doesn't need to be set. + +Signed-off-by: Torsten Fleischer <torfl6749@gmail.com> +Signed-off-by: Mark Brown <broonie@kernel.org> +--- + Documentation/devicetree/bindings/spi/spi-gpio.txt | 6 ++++-- + drivers/spi/spi-gpio.c | 21 +++++++++++++++------ + 2 files changed, 19 insertions(+), 8 deletions(-) + +--- a/Documentation/devicetree/bindings/spi/spi-gpio.txt ++++ b/Documentation/devicetree/bindings/spi/spi-gpio.txt +@@ -8,8 +8,10 @@ Required properties: + - gpio-sck: GPIO spec for the SCK line to use + - gpio-miso: GPIO spec for the MISO line to use + - gpio-mosi: GPIO spec for the MOSI line to use +- - cs-gpios: GPIOs to use for chipselect lines +- - num-chipselects: number of chipselect lines ++ - cs-gpios: GPIOs to use for chipselect lines. ++ Not needed if num-chipselects = <0>. ++ - num-chipselects: Number of chipselect lines. Should be <0> if a single device ++ with no chip select is connected. + + Example: + +--- a/drivers/spi/spi-gpio.c ++++ b/drivers/spi/spi-gpio.c +@@ -424,6 +424,7 @@ static int spi_gpio_probe(struct platfor + struct spi_gpio_platform_data *pdata; + u16 master_flags = 0; + bool use_of = 0; ++ int num_devices; + + status = spi_gpio_probe_dt(pdev); + if (status < 0) +@@ -433,16 +434,21 @@ static int spi_gpio_probe(struct platfor + + pdata = dev_get_platdata(&pdev->dev); + #ifdef GENERIC_BITBANG +- if (!pdata || !pdata->num_chipselect) ++ if (!pdata || (!use_of && !pdata->num_chipselect)) + return -ENODEV; + #endif + ++ if (use_of && !SPI_N_CHIPSEL) ++ num_devices = 1; ++ else ++ num_devices = SPI_N_CHIPSEL; ++ + status = spi_gpio_request(pdata, dev_name(&pdev->dev), &master_flags); + if (status < 0) + return status; + + master = spi_alloc_master(&pdev->dev, sizeof(*spi_gpio) + +- (sizeof(int) * SPI_N_CHIPSEL)); ++ (sizeof(int) * num_devices)); + if (!master) { + status = -ENOMEM; + goto gpio_free; +@@ -457,7 +463,7 @@ static int spi_gpio_probe(struct platfor + master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); + master->flags = master_flags; + master->bus_num = pdev->id; +- master->num_chipselect = SPI_N_CHIPSEL; ++ master->num_chipselect = num_devices; + master->setup = spi_gpio_setup; + master->cleanup = spi_gpio_cleanup; + #ifdef CONFIG_OF +@@ -472,9 +478,12 @@ static int spi_gpio_probe(struct platfor + * property of the node. + */ + +- for (i = 0; i < SPI_N_CHIPSEL; i++) +- spi_gpio->cs_gpios[i] = +- of_get_named_gpio(np, "cs-gpios", i); ++ if (!SPI_N_CHIPSEL) ++ spi_gpio->cs_gpios[0] = SPI_GPIO_NO_CHIPSELECT; ++ else ++ for (i = 0; i < SPI_N_CHIPSEL; i++) ++ spi_gpio->cs_gpios[i] = ++ of_get_named_gpio(np, "cs-gpios", i); + } + #endif + |