IMX: introduce clock API

This patch introduces the clock API for i.MX and converts all
in-Kernel drivers to use it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 28 insertions, 10 deletions

diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c
index c730d05bfeb6..bd0729b6b6ed 100644
--- a/drivers/spi/spi_imx.c
+++ b/drivers/spi/spi_imx.c
@@ -29,6 +29,7 @@
 #include <linux/spi/spi.h>
 #include <linux/workqueue.h>
 #include <linux/delay.h>
+#include <linux/clk.h>
 
 #include <asm/io.h>
 #include <asm/irq.h>
@@ -250,6 +251,8 @@ struct driver_data {
         int tx_dma_needs_unmap;
         size_t tx_map_len;
         u32 dummy_dma_buf ____cacheline_aligned;
+
+        struct clk *clk;
 };
 
 /* Runtime state */
@@ -855,15 +858,15 @@ static irqreturn_t spi_int(int irq, void *dev_id)
         return drv_data->transfer_handler(drv_data);
 }
 
-static inline u32 spi_speed_hz(u32 data_rate)
+static inline u32 spi_speed_hz(struct driver_data *drv_data, u32 data_rate)
 {
-        return imx_get_perclk2() / (4 << ((data_rate) >> 13));
+        return clk_get_rate(drv_data->clk) / (4 << ((data_rate) >> 13));
 }
 
-static u32 spi_data_rate(u32 speed_hz)
+static u32 spi_data_rate(struct driver_data *drv_data, u32 speed_hz)
 {
         u32 div;
-        u32 quantized_hz = imx_get_perclk2() >> 2;
+        u32 quantized_hz = clk_get_rate(drv_data->clk) >> 2;
 
         for (div = SPI_PERCLK2_DIV_MIN;
                 div <= SPI_PERCLK2_DIV_MAX;
@@ -947,7 +950,7 @@ static void pump_transfers(unsigned long data)
         tmp = transfer->speed_hz;
         if (tmp == 0)
                 tmp = chip->max_speed_hz;
-        tmp = spi_data_rate(tmp);
+        tmp = spi_data_rate(drv_data, tmp);
         u32_EDIT(control, SPI_CONTROL_DATARATE, tmp);
 
         writel(control, regs + SPI_CONTROL);
@@ -1109,7 +1112,7 @@ static int transfer(struct spi_device *spi, struct spi_message *msg)
         msg->actual_length = 0;
 
         /* Per transfer setup check */
-        min_speed_hz = spi_speed_hz(SPI_CONTROL_DATARATE_MIN);
+        min_speed_hz = spi_speed_hz(drv_data, SPI_CONTROL_DATARATE_MIN);
         max_speed_hz = spi->max_speed_hz;
         list_for_each_entry(trans, &msg->transfers, transfer_list) {
                 tmp = trans->bits_per_word;
@@ -1176,6 +1179,7 @@ msg_rejected:
    applied and notified to the calling driver. */
 static int setup(struct spi_device *spi)
 {
+        struct driver_data *drv_data = spi_master_get_devdata(spi->master);
         struct spi_imx_chip *chip_info;
         struct chip_data *chip;
         int first_setup = 0;
@@ -1304,14 +1308,14 @@ static int setup(struct spi_device *spi)
         chip->n_bytes = (tmp <= 8) ? 1 : 2;
 
         /* SPI datarate */
-        tmp = spi_data_rate(spi->max_speed_hz);
+        tmp = spi_data_rate(drv_data, spi->max_speed_hz);
         if (tmp == SPI_CONTROL_DATARATE_BAD) {
                 status = -EINVAL;
                 dev_err(&spi->dev,
                         "setup - "
                         "HW min speed (%d Hz) exceeds required "
                         "max speed (%d Hz)\n",
-                        spi_speed_hz(SPI_CONTROL_DATARATE_MIN),
+                        spi_speed_hz(drv_data, SPI_CONTROL_DATARATE_MIN),
                         spi->max_speed_hz);
                 if (first_setup)
                         goto err_first_setup;
@@ -1321,7 +1325,7 @@ static int setup(struct spi_device *spi)
         } else {
                 u32_EDIT(chip->control, SPI_CONTROL_DATARATE, tmp);
                 /* Actual rounded max_speed_hz */
-                tmp = spi_speed_hz(tmp);
+                tmp = spi_speed_hz(drv_data, tmp);
                 spi->max_speed_hz = tmp;
                 chip->max_speed_hz = tmp;
         }
@@ -1352,7 +1356,7 @@ static int setup(struct spi_device *spi)
                 chip->period & SPI_PERIOD_WAIT,
                 spi->mode,
                 spi->bits_per_word,
-                spi_speed_hz(SPI_CONTROL_DATARATE_MIN),
+                spi_speed_hz(drv_data, SPI_CONTROL_DATARATE_MIN),
                 spi->max_speed_hz);
         return status;
 
@@ -1465,6 +1469,14 @@ static int __init spi_imx_probe(struct platform_device *pdev)
                 goto err_no_pdata;
         }
 
+        drv_data->clk = clk_get(&pdev->dev, "perclk2");
+        if (IS_ERR(drv_data->clk)) {
+                dev_err(&pdev->dev, "probe - cannot get get\n");
+                status = PTR_ERR(drv_data->clk);
+                goto err_no_clk;
+        }
+        clk_enable(drv_data->clk);
+
         /* Allocate master with space for drv_data */
         master = spi_alloc_master(dev, sizeof(struct driver_data));
         if (!master) {
@@ -1623,6 +1635,9 @@ err_no_iores:
         spi_master_put(master);
 
 err_no_pdata:
+        clk_disable(drv_data->clk);
+        clk_put(drv_data->clk);
+err_no_clk:
 err_no_mem:
         return status;
 }
@@ -1662,6 +1677,9 @@ static int __exit spi_imx_remove(struct platform_device *pdev)
         if (irq >= 0)
                 free_irq(irq, drv_data);
 
+        clk_disable(drv_data->clk);
+        clk_put(drv_data->clk);
+
         /* Release map resources */
         iounmap(drv_data->regs);
         release_resource(drv_data->ioarea);