mmc: sh-mmcif: add OF support, make platform data optional

Add primitive OF support to the sh-mmcif driver, which also makes it
necessary to be able to run without platform data.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 20 insertions, 9 deletions

diff --git a/drivers/mmc/host/sh_mmcif.c b/drivers/mmc/host/sh_mmcif.c
index 204bcedc2164..68b31f7c290b 100644
--- a/drivers/mmc/host/sh_mmcif.c
+++ b/drivers/mmc/host/sh_mmcif.c
@@ -54,6 +54,7 @@
 #include <linux/mmc/mmc.h>
 #include <linux/mmc/sdio.h>
 #include <linux/mmc/sh_mmcif.h>
+#include <linux/mod_devicetable.h>
 #include <linux/pagemap.h>
 #include <linux/platform_device.h>
 #include <linux/pm_qos.h>
@@ -384,6 +385,9 @@ static void sh_mmcif_request_dma(struct sh_mmcif_host *host,
         struct sh_dmae_slave *tx, *rx;
         host->dma_active = false;
 
+        if (!pdata)
+                return;
+
         /* We can only either use DMA for both Tx and Rx or not use it at all */
         if (pdata->dma) {
                 dev_warn(&host->pd->dev,
@@ -444,13 +448,14 @@ static void sh_mmcif_release_dma(struct sh_mmcif_host *host)
 static void sh_mmcif_clock_control(struct sh_mmcif_host *host, unsigned int clk)
 {
         struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
+        bool sup_pclk = p ? p->sup_pclk : false;
 
         sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_ENABLE);
         sh_mmcif_bitclr(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR);
 
         if (!clk)
                 return;
-        if (p->sup_pclk && clk == host->clk)
+        if (sup_pclk && clk == host->clk)
                 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_SUP_PCLK);
         else
                 sh_mmcif_bitset(host, MMCIF_CE_CLK_CTRL, CLK_CLEAR &
@@ -928,7 +933,7 @@ static void sh_mmcif_set_power(struct sh_mmcif_host *host, struct mmc_ios *ios)
         struct sh_mmcif_plat_data *pd = host->pd->dev.platform_data;
         struct mmc_host *mmc = host->mmc;
 
-        if (pd->set_pwr)
+        if (pd && pd->set_pwr)
                 pd->set_pwr(host->pd, ios->power_mode != MMC_POWER_OFF);
         if (!IS_ERR(mmc->supply.vmmc))
                 /* Errors ignored... */
@@ -996,7 +1001,7 @@ static int sh_mmcif_get_cd(struct mmc_host *mmc)
         struct sh_mmcif_host *host = mmc_priv(mmc);
         struct sh_mmcif_plat_data *p = host->pd->dev.platform_data;
 
-        if (!p->get_cd)
+        if (!p || !p->get_cd)
                 return -ENOSYS;
         else
                 return p->get_cd(host->pd);
@@ -1269,6 +1274,9 @@ static void sh_mmcif_init_ocr(struct sh_mmcif_host *host)
 
         mmc_regulator_get_supply(mmc);
 
+        if (!pd)
+                return;
+
         if (!mmc->ocr_avail)
                 mmc->ocr_avail = pd->ocr;
         else if (pd->ocr)
@@ -1285,11 +1293,6 @@ static int __devinit sh_mmcif_probe(struct platform_device *pdev)
         void __iomem *reg;
         char clk_name[8];
 
-        if (!pd) {
-                dev_err(&pdev->dev, "sh_mmcif plat data error.\n");
-                return -ENXIO;
-        }
-
         irq[0] = platform_get_irq(pdev, 0);
         irq[1] = platform_get_irq(pdev, 1);
         if (irq[0] < 0 || irq[1] < 0) {
@@ -1325,7 +1328,7 @@ static int __devinit sh_mmcif_probe(struct platform_device *pdev)
         sh_mmcif_init_ocr(host);
 
         mmc->caps = MMC_CAP_MMC_HIGHSPEED;
-        if (pd->caps)
+        if (pd && pd->caps)
                 mmc->caps |= pd->caps;
         mmc->max_segs = 32;
         mmc->max_blk_size = 512;
@@ -1462,6 +1465,12 @@ static int sh_mmcif_resume(struct device *dev)
 #define sh_mmcif_resume         NULL
 #endif  /* CONFIG_PM */
 
+static const struct of_device_id mmcif_of_match[] = {
+        { .compatible = "renesas,sh-mmcif" },
+        { }
+};
+MODULE_DEVICE_TABLE(of, mmcif_of_match);
+
 static const struct dev_pm_ops sh_mmcif_dev_pm_ops = {
         .suspend = sh_mmcif_suspend,
         .resume = sh_mmcif_resume,
@@ -1473,6 +1482,8 @@ static struct platform_driver sh_mmcif_driver = {
         .driver         = {
                 .name   = DRIVER_NAME,
                 .pm     = &sh_mmcif_dev_pm_ops,
+                .owner  = THIS_MODULE,
+                .of_match_table = mmcif_of_match,
         },
 };