This patch adds a simple Device Tree binding for the mvsdio driver, as well as the necessary documentation for it. Compatibility with non-DT platforms is preserved, by keeping the platform_data based initialization. We introduce a small difference between non-DT and DT platforms: DT platforms are required to provide a clocks = <...> property, which the driver uses to get the frequency of the clock that goes to the SDIO IP. The behaviour on non-DT platforms is kept unchanged: a clock reference is not mandatory, but the clock frequency must be passed in the "clock" field of the mvsdio_platform_data structure. Signed-off-by: Thomas Petazzoni --- .../devicetree/bindings/mmc/orion-sdio.txt | 17 ++++++ drivers/mmc/host/mvsdio.c | 60 +++++++++++++++----- 2 files changed, 62 insertions(+), 15 deletions(-) create mode 100644 Documentation/devicetree/bindings/mmc/orion-sdio.txt --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/orion-sdio.txt @@ -0,0 +1,17 @@ +* Marvell orion-sdio controller + +This file documents differences between the core properties in mmc.txt +and the properties used by the orion-sdio driver. + +- compatible: Should be "marvell,orion-sdio" +- clocks: reference to the clock of the SDIO interface + +Example: + + mvsdio@d00d4000 { + compatible = "marvell,orion-sdio"; + reg = <0xd00d4000 0x200>; + interrupts = <54>; + clocks = <&gateclk 17>; + status = "disabled"; + }; --- a/drivers/mmc/host/mvsdio.c +++ b/drivers/mmc/host/mvsdio.c @@ -21,6 +21,8 @@ #include #include #include +#include +#include #include #include @@ -683,17 +685,17 @@ mv_conf_mbus_windows(struct mvsd_host *h static int __init mvsd_probe(struct platform_device *pdev) { + struct device_node *np = pdev->dev.of_node; struct mmc_host *mmc = NULL; struct mvsd_host *host = NULL; - const struct mvsdio_platform_data *mvsd_data; const struct mbus_dram_target_info *dram; struct resource *r; int ret, irq; + int gpio_card_detect, gpio_write_protect; r = platform_get_resource(pdev, IORESOURCE_MEM, 0); irq = platform_get_irq(pdev, 0); - mvsd_data = pdev->dev.platform_data; - if (!r || irq < 0 || !mvsd_data) + if (!r || irq < 0) return -ENXIO; r = request_mem_region(r->start, SZ_1K, DRIVER_NAME); @@ -710,7 +712,35 @@ static int __init mvsd_probe(struct plat host->mmc = mmc; host->dev = &pdev->dev; host->res = r; - host->base_clock = mvsd_data->clock / 2; + + /* Some non-DT platforms do not pass a clock, and the clock + frequency is passed through platform_data. On DT platforms, + a clock must always be passed, even if there is no gatable + clock associated to the SDIO interface (it can simply be a + fixed rate clock). */ + host->clk = clk_get(&pdev->dev, NULL); + if (!IS_ERR(host->clk)) + clk_prepare_enable(host->clk); + + if (np) { + if (IS_ERR(host->clk)) { + dev_err(&pdev->dev, "DT platforms must have a clock associated\n"); + ret = -EINVAL; + goto out; + } + + host->base_clock = clk_get_rate(host->clk) / 2; + gpio_card_detect = of_get_named_gpio(np, "cd-gpios", 0); + gpio_write_protect = of_get_named_gpio(np, "wp-gpios", 0); + } else { + const struct mvsdio_platform_data *mvsd_data; + mvsd_data = pdev->dev.platform_data; + if (!mvsd_data) + return -ENXIO; + host->base_clock = mvsd_data->clock / 2; + gpio_card_detect = mvsd_data->gpio_card_detect; + gpio_write_protect = mvsd_data->gpio_write_protect; + } mmc->ops = &mvsd_ops; @@ -750,21 +780,14 @@ static int __init mvsd_probe(struct plat } else host->irq = irq; - /* Not all platforms can gate the clock, so it is not - an error if the clock does not exists. */ - host->clk = clk_get(&pdev->dev, NULL); - if (!IS_ERR(host->clk)) { - clk_prepare_enable(host->clk); - } - - if (gpio_is_valid(mvsd_data->gpio_card_detect)) { - ret = mmc_gpio_request_cd(mmc, mvsd_data->gpio_card_detect); + if (gpio_is_valid(gpio_card_detect)) { + ret = mmc_gpio_request_cd(mmc, gpio_card_detect); if (ret) goto out; } else mmc->caps |= MMC_CAP_NEEDS_POLL; - mmc_gpio_request_ro(mmc, mvsd_data->gpio_write_protect); + mmc_gpio_request_ro(mmc, gpio_write_protect); setup_timer(&host->timer, mvsd_timeout_timer, (unsigned long)host); platform_set_drvdata(pdev, mmc); @@ -776,7 +799,7 @@ static int __init mvsd_probe(struct plat mmc_hostname(mmc), DRIVER_NAME); if (!(mmc->caps & MMC_CAP_NEEDS_POLL)) printk("using GPIO %d for card detection\n", - mvsd_data->gpio_card_detect); + gpio_card_detect); else printk("lacking card detect (fall back to polling)\n"); return 0; @@ -855,12 +878,19 @@ static int mvsd_resume(struct platform_d #define mvsd_resume NULL #endif +static const struct of_device_id mvsdio_dt_ids[] = { + { .compatible = "marvell,orion-sdio" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, mvsdio_dt_ids); + static struct platform_driver mvsd_driver = { .remove = __exit_p(mvsd_remove), .suspend = mvsd_suspend, .resume = mvsd_resume, .driver = { .name = DRIVER_NAME, + .of_match_table = mvsdio_dt_ids, }, };