ACPI / LPSS: register clock device for Lynxpoint DMA properly

The DMA controller in Lynxpoint is enumerated as a regular ACPI device now. To
work properly it is using the LPSS root clock as a functional clock. That's why
we have to register the clock device accordingly to the ACPI ID of the DMA
controller. The acpi_lpss.c module is responsible to do the job.

This patch also removes hardcoded name of the DMA device in clk-lpt.c and the
name of the root clock in acpi_lpss.c.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 11 insertions, 4 deletions

diff --git a/drivers/clk/x86/clk-lpt.c b/drivers/clk/x86/clk-lpt.c
index 5cf4f4686406..4f45eee9e33b 100644
--- a/drivers/clk/x86/clk-lpt.c
+++ b/drivers/clk/x86/clk-lpt.c
@@ -15,22 +15,29 @@
 #include <linux/clk-provider.h>
 #include <linux/err.h>
 #include <linux/module.h>
+#include <linux/platform_data/clk-lpss.h>
 #include <linux/platform_device.h>
 
 #define PRV_CLOCK_PARAMS 0x800
 
 static int lpt_clk_probe(struct platform_device *pdev)
 {
+        struct lpss_clk_data *drvdata;
         struct clk *clk;
 
+        drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
+        if (!drvdata)
+                return -ENOMEM;
+
         /* LPSS free running clock */
-        clk = clk_register_fixed_rate(&pdev->dev, "lpss_clk", NULL, CLK_IS_ROOT,
-                                      100000000);
+        drvdata->name = "lpss_clk";
+        clk = clk_register_fixed_rate(&pdev->dev, drvdata->name, NULL,
+                                      CLK_IS_ROOT, 100000000);
         if (IS_ERR(clk))
                 return PTR_ERR(clk);
 
-        /* Shared DMA clock */
-        clk_register_clkdev(clk, "hclk", "INTL9C60.0.auto");
+        drvdata->clk = clk;
+        platform_set_drvdata(pdev, drvdata);
         return 0;
 }