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spi: gpio: Don't request CS GPIO in DT use-case
DT use-case already relies on SPI core to control CS (requested by of_spi_register_master() and controlled spi_set_cs()), so there's no need to try to request those GPIO in spi-gpio code. Change the code such that spi-gpio's CS related code is only used if device is probed via pdata. Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com> Cc: Mark Brown <broonie@kernel.org> Cc: Chris Healy <cphealy@gmail.com> Cc: linux-spi@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Andrey Smirnov
Mark Brown
parent
d9088966c8
commit
249e2632dc
@ -46,7 +46,6 @@ struct spi_gpio {
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struct gpio_desc *miso;
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struct gpio_desc *mosi;
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struct gpio_desc **cs_gpios;
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bool has_cs;
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};
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/*----------------------------------------------------------------------*/
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@ -216,7 +215,7 @@ static void spi_gpio_chipselect(struct spi_device *spi, int is_active)
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gpiod_set_value_cansleep(spi_gpio->sck, spi->mode & SPI_CPOL);
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/* Drive chip select line, if we have one */
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if (spi_gpio->has_cs) {
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if (spi_gpio->cs_gpios) {
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struct gpio_desc *cs = spi_gpio->cs_gpios[spi->chip_select];
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/* SPI chip selects are normally active-low */
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@ -234,10 +233,12 @@ static int spi_gpio_setup(struct spi_device *spi)
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* The CS GPIOs have already been
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* initialized from the descriptor lookup.
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*/
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cs = spi_gpio->cs_gpios[spi->chip_select];
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if (!spi->controller_state && cs)
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status = gpiod_direction_output(cs,
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!(spi->mode & SPI_CS_HIGH));
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if (spi_gpio->cs_gpios) {
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cs = spi_gpio->cs_gpios[spi->chip_select];
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if (!spi->controller_state && cs)
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status = gpiod_direction_output(cs,
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!(spi->mode & SPI_CS_HIGH));
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}
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if (!status)
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status = spi_bitbang_setup(spi);
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@ -290,11 +291,8 @@ static void spi_gpio_cleanup(struct spi_device *spi)
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*/
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static int spi_gpio_request(struct device *dev,
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struct spi_gpio *spi_gpio,
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unsigned int num_chipselects,
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u16 *mflags)
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{
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int i;
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spi_gpio->mosi = devm_gpiod_get_optional(dev, "mosi", GPIOD_OUT_LOW);
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if (IS_ERR(spi_gpio->mosi))
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return PTR_ERR(spi_gpio->mosi);
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@ -315,13 +313,6 @@ static int spi_gpio_request(struct device *dev,
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if (IS_ERR(spi_gpio->sck))
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return PTR_ERR(spi_gpio->sck);
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for (i = 0; i < num_chipselects; i++) {
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spi_gpio->cs_gpios[i] = devm_gpiod_get_index(dev, "cs",
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i, GPIOD_OUT_HIGH);
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if (IS_ERR(spi_gpio->cs_gpios[i]))
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return PTR_ERR(spi_gpio->cs_gpios[i]);
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}
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return 0;
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}
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@ -332,90 +323,87 @@ static const struct of_device_id spi_gpio_dt_ids[] = {
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};
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MODULE_DEVICE_TABLE(of, spi_gpio_dt_ids);
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static int spi_gpio_probe_dt(struct platform_device *pdev)
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static int spi_gpio_probe_dt(struct platform_device *pdev,
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struct spi_master *master)
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{
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int ret;
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u32 tmp;
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struct spi_gpio_platform_data *pdata;
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struct device_node *np = pdev->dev.of_node;
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const struct of_device_id *of_id =
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of_match_device(spi_gpio_dt_ids, &pdev->dev);
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master->dev.of_node = pdev->dev.of_node;
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master->use_gpio_descriptors = true;
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if (!of_id)
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return 0;
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pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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ret = of_property_read_u32(np, "num-chipselects", &tmp);
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if (ret < 0) {
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dev_err(&pdev->dev, "num-chipselects property not found\n");
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goto error_free;
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}
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pdata->num_chipselect = tmp;
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pdev->dev.platform_data = pdata;
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return 1;
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error_free:
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devm_kfree(&pdev->dev, pdata);
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return ret;
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return 0;
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}
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#else
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static inline int spi_gpio_probe_dt(struct platform_device *pdev)
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static inline int spi_gpio_probe_dt(struct platform_device *pdev,
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struct spi_master *master)
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{
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return 0;
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}
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#endif
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static int spi_gpio_probe_pdata(struct platform_device *pdev,
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struct spi_master *master)
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{
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struct device *dev = &pdev->dev;
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struct spi_gpio_platform_data *pdata = dev_get_platdata(dev);
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struct spi_gpio *spi_gpio = spi_master_get_devdata(master);
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int i;
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#ifdef GENERIC_BITBANG
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if (!pdata || !pdata->num_chipselect)
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return -ENODEV;
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#endif
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/*
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* The master needs to think there is a chipselect even if not
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* connected
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*/
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master->num_chipselect = pdata->num_chipselect ?: 1;
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spi_gpio->cs_gpios = devm_kcalloc(dev, master->num_chipselect,
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sizeof(*spi_gpio->cs_gpios),
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GFP_KERNEL);
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if (!spi_gpio->cs_gpios)
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return -ENOMEM;
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for (i = 0; i < master->num_chipselect; i++) {
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spi_gpio->cs_gpios[i] = devm_gpiod_get_index(dev, "cs", i,
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GPIOD_OUT_HIGH);
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if (IS_ERR(spi_gpio->cs_gpios[i]))
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return PTR_ERR(spi_gpio->cs_gpios[i]);
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}
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return 0;
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}
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static int spi_gpio_probe(struct platform_device *pdev)
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{
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int status;
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struct spi_master *master;
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struct spi_gpio *spi_gpio;
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struct spi_gpio_platform_data *pdata;
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struct device *dev = &pdev->dev;
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struct spi_bitbang *bb;
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const struct of_device_id *of_id;
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u16 master_flags = 0;
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bool use_of = 0;
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status = spi_gpio_probe_dt(pdev);
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if (status < 0)
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return status;
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if (status > 0)
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use_of = 1;
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pdata = dev_get_platdata(dev);
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#ifdef GENERIC_BITBANG
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if (!pdata || (!use_of && !pdata->num_chipselect))
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return -ENODEV;
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#endif
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of_id = of_match_device(spi_gpio_dt_ids, &pdev->dev);
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master = spi_alloc_master(dev, sizeof(*spi_gpio));
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if (!master)
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return -ENOMEM;
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spi_gpio = spi_master_get_devdata(master);
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if (of_id)
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status = spi_gpio_probe_dt(pdev, master);
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else
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status = spi_gpio_probe_pdata(pdev, master);
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spi_gpio->cs_gpios = devm_kcalloc(dev,
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pdata->num_chipselect,
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sizeof(*spi_gpio->cs_gpios),
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GFP_KERNEL);
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if (!spi_gpio->cs_gpios)
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return -ENOMEM;
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if (status)
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return status;
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spi_gpio = spi_master_get_devdata(master);
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platform_set_drvdata(pdev, spi_gpio);
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/* Determine if we have chip selects connected */
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spi_gpio->has_cs = !!pdata->num_chipselect;
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spi_gpio->pdev = pdev;
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status = spi_gpio_request(dev, spi_gpio,
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pdata->num_chipselect, &master_flags);
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status = spi_gpio_request(dev, spi_gpio, &master_flags);
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if (status)
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return status;
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@ -424,13 +412,9 @@ static int spi_gpio_probe(struct platform_device *pdev)
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SPI_CS_HIGH;
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master->flags = master_flags;
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master->bus_num = pdev->id;
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/* The master needs to think there is a chipselect even if not connected */
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master->num_chipselect = spi_gpio->has_cs ? pdata->num_chipselect : 1;
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master->setup = spi_gpio_setup;
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master->cleanup = spi_gpio_cleanup;
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#ifdef CONFIG_OF
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master->dev.of_node = dev->of_node;
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#endif
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bb = &spi_gpio->bitbang;
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bb->master = master;
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bb->chipselect = spi_gpio_chipselect;
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