From b36581df7e788b674a4efbb8da7fe4a00c207e8b Mon Sep 17 00:00:00 2001 From: Alexander Shiyan Date: Wed, 8 Jun 2016 20:02:06 +0300 Subject: [PATCH] spi: imx: Using existing properties for chipselects Patch reuse existing "chip_select" and "cs_gpio(s)" fields from SPI core. Signed-off-by: Alexander Shiyan Signed-off-by: Mark Brown --- drivers/spi/spi-imx.c | 124 ++++++++++++++++++++---------------------- 1 file changed, 58 insertions(+), 66 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 50769078e72e..cbcfb8b70b21 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -60,7 +60,6 @@ struct spi_imx_config { unsigned int speed_hz; unsigned int bpw; unsigned int mode; - u8 cs; }; enum spi_imx_devtype { @@ -76,7 +75,7 @@ struct spi_imx_data; struct spi_imx_devtype_data { void (*intctrl)(struct spi_imx_data *, int); - int (*config)(struct spi_imx_data *, struct spi_imx_config *); + int (*config)(struct spi_device *, struct spi_imx_config *); void (*trigger)(struct spi_imx_data *); int (*rx_available)(struct spi_imx_data *); void (*reset)(struct spi_imx_data *); @@ -112,7 +111,6 @@ struct spi_imx_data { struct completion dma_tx_completion; const struct spi_imx_devtype_data *devtype_data; - int chipselect[0]; }; static inline int is_imx27_cspi(struct spi_imx_data *d) @@ -334,9 +332,10 @@ static void __maybe_unused mx51_ecspi_trigger(struct spi_imx_data *spi_imx) writel(reg, spi_imx->base + MX51_ECSPI_CTRL); } -static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, - struct spi_imx_config *config) +static int __maybe_unused mx51_ecspi_config(struct spi_device *spi, + struct spi_imx_config *config) { + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); u32 ctrl = MX51_ECSPI_CTRL_ENABLE; u32 clk = config->speed_hz, delay, reg; u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG); @@ -355,28 +354,28 @@ static int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, spi_imx->spi_bus_clk = clk; /* set chip select to use */ - ctrl |= MX51_ECSPI_CTRL_CS(config->cs); + ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select); ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET; - cfg |= MX51_ECSPI_CONFIG_SBBCTRL(config->cs); + cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select); if (config->mode & SPI_CPHA) - cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs); + cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select); else - cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(config->cs); + cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select); if (config->mode & SPI_CPOL) { - cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs); - cfg |= MX51_ECSPI_CONFIG_SCLKCTL(config->cs); + cfg |= MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select); + cfg |= MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select); } else { - cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(config->cs); - cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(config->cs); + cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select); + cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select); } if (config->mode & SPI_CS_HIGH) - cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs); + cfg |= MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select); else - cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(config->cs); + cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select); if (spi_imx->usedma) ctrl |= MX51_ECSPI_CTRL_SMC; @@ -480,11 +479,11 @@ static void __maybe_unused mx31_trigger(struct spi_imx_data *spi_imx) writel(reg, spi_imx->base + MXC_CSPICTRL); } -static int __maybe_unused mx31_config(struct spi_imx_data *spi_imx, - struct spi_imx_config *config) +static int __maybe_unused mx31_config(struct spi_device *spi, + struct spi_imx_config *config) { + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER; - int cs = spi_imx->chipselect[config->cs]; reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) << MX31_CSPICTRL_DR_SHIFT; @@ -502,8 +501,8 @@ static int __maybe_unused mx31_config(struct spi_imx_data *spi_imx, reg |= MX31_CSPICTRL_POL; if (config->mode & SPI_CS_HIGH) reg |= MX31_CSPICTRL_SSPOL; - if (cs < 0) - reg |= (cs + 32) << + if (spi->cs_gpio < 0) + reg |= (spi->cs_gpio + 32) << (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT : MX31_CSPICTRL_CS_SHIFT); @@ -558,11 +557,11 @@ static void __maybe_unused mx21_trigger(struct spi_imx_data *spi_imx) writel(reg, spi_imx->base + MXC_CSPICTRL); } -static int __maybe_unused mx21_config(struct spi_imx_data *spi_imx, - struct spi_imx_config *config) +static int __maybe_unused mx21_config(struct spi_device *spi, + struct spi_imx_config *config) { + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER; - int cs = spi_imx->chipselect[config->cs]; unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18; reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) << @@ -575,8 +574,8 @@ static int __maybe_unused mx21_config(struct spi_imx_data *spi_imx, reg |= MX21_CSPICTRL_POL; if (config->mode & SPI_CS_HIGH) reg |= MX21_CSPICTRL_SSPOL; - if (cs < 0) - reg |= (cs + 32) << MX21_CSPICTRL_CS_SHIFT; + if (spi->cs_gpio < 0) + reg |= (spi->cs_gpio + 32) << MX21_CSPICTRL_CS_SHIFT; writel(reg, spi_imx->base + MXC_CSPICTRL); @@ -625,9 +624,10 @@ static void __maybe_unused mx1_trigger(struct spi_imx_data *spi_imx) writel(reg, spi_imx->base + MXC_CSPICTRL); } -static int __maybe_unused mx1_config(struct spi_imx_data *spi_imx, - struct spi_imx_config *config) +static int __maybe_unused mx1_config(struct spi_device *spi, + struct spi_imx_config *config) { + struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER; reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) << @@ -747,15 +747,13 @@ MODULE_DEVICE_TABLE(of, spi_imx_dt_ids); static void spi_imx_chipselect(struct spi_device *spi, int is_active) { - struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); - int gpio = spi_imx->chipselect[spi->chip_select]; int active = is_active != BITBANG_CS_INACTIVE; int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH); - if (!gpio_is_valid(gpio)) + if (!gpio_is_valid(spi->cs_gpio)) return; - gpio_set_value(gpio, dev_is_lowactive ^ active); + gpio_set_value(spi->cs_gpio, dev_is_lowactive ^ active); } static void spi_imx_push(struct spi_imx_data *spi_imx) @@ -860,7 +858,6 @@ static int spi_imx_setupxfer(struct spi_device *spi, config.bpw = t ? t->bits_per_word : spi->bits_per_word; config.speed_hz = t ? t->speed_hz : spi->max_speed_hz; config.mode = spi->mode; - config.cs = spi->chip_select; if (!config.speed_hz) config.speed_hz = spi->max_speed_hz; @@ -891,7 +888,7 @@ static int spi_imx_setupxfer(struct spi_device *spi, return ret; } - spi_imx->devtype_data->config(spi_imx, &config); + spi_imx->devtype_data->config(spi, &config); return 0; } @@ -1080,14 +1077,12 @@ static int spi_imx_transfer(struct spi_device *spi, static int spi_imx_setup(struct spi_device *spi) { - struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); - int gpio = spi_imx->chipselect[spi->chip_select]; - dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__, spi->mode, spi->bits_per_word, spi->max_speed_hz); - if (gpio_is_valid(gpio)) - gpio_direction_output(gpio, spi->mode & SPI_CS_HIGH ? 0 : 1); + if (gpio_is_valid(spi->cs_gpio)) + gpio_direction_output(spi->cs_gpio, + spi->mode & SPI_CS_HIGH ? 0 : 1); spi_imx_chipselect(spi, BITBANG_CS_INACTIVE); @@ -1137,31 +1132,21 @@ static int spi_imx_probe(struct platform_device *pdev) struct spi_master *master; struct spi_imx_data *spi_imx; struct resource *res; - int i, ret, num_cs, irq; + int i, ret, irq; if (!np && !mxc_platform_info) { dev_err(&pdev->dev, "can't get the platform data\n"); return -EINVAL; } - ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs); - if (ret < 0) { - if (mxc_platform_info) - num_cs = mxc_platform_info->num_chipselect; - else - return ret; - } - - master = spi_alloc_master(&pdev->dev, - sizeof(struct spi_imx_data) + sizeof(int) * num_cs); + master = spi_alloc_master(&pdev->dev, sizeof(struct spi_imx_data)); if (!master) return -ENOMEM; platform_set_drvdata(pdev, master); master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); - master->bus_num = pdev->id; - master->num_chipselect = num_cs; + master->bus_num = np ? -1 : pdev->id; spi_imx = spi_master_get_devdata(master); spi_imx->bitbang.master = master; @@ -1170,22 +1155,16 @@ static int spi_imx_probe(struct platform_device *pdev) spi_imx->devtype_data = of_id ? of_id->data : (struct spi_imx_devtype_data *)pdev->id_entry->driver_data; - for (i = 0; i < master->num_chipselect; i++) { - int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); - if (!gpio_is_valid(cs_gpio) && mxc_platform_info) - cs_gpio = mxc_platform_info->chipselect[i]; + if (mxc_platform_info) { + master->num_chipselect = mxc_platform_info->num_chipselect; + master->cs_gpios = devm_kzalloc(&master->dev, + sizeof(int) * master->num_chipselect, GFP_KERNEL); + if (!master->cs_gpios) + return -ENOMEM; - spi_imx->chipselect[i] = cs_gpio; - if (!gpio_is_valid(cs_gpio)) - continue; - - ret = devm_gpio_request(&pdev->dev, spi_imx->chipselect[i], - DRIVER_NAME); - if (ret) { - dev_err(&pdev->dev, "can't get cs gpios\n"); - goto out_master_put; - } - } + for (i = 0; i < master->num_chipselect; i++) + master->cs_gpios[i] = mxc_platform_info->chipselect[i]; + } spi_imx->bitbang.chipselect = spi_imx_chipselect; spi_imx->bitbang.setup_transfer = spi_imx_setupxfer; @@ -1267,6 +1246,19 @@ static int spi_imx_probe(struct platform_device *pdev) goto out_clk_put; } + for (i = 0; i < master->num_chipselect; i++) { + if (!gpio_is_valid(master->cs_gpios[i])) + continue; + + ret = devm_gpio_request(&pdev->dev, master->cs_gpios[i], + DRIVER_NAME); + if (ret) { + dev_err(&pdev->dev, "Can't get CS GPIO %i\n", + master->cs_gpios[i]); + goto out_clk_put; + } + } + dev_info(&pdev->dev, "probed\n"); clk_disable(spi_imx->clk_ipg);