2 files changed, 82 insertions, 10 deletions

diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
index 652fd5ce303c..f6d760581faa 100644
--- a/drivers/acpi/acpi_lpss.c
+++ b/drivers/acpi/acpi_lpss.c
@@ -33,11 +33,19 @@ ACPI_MODULE_NAME("acpi_lpss");
 #define LPSS_SW_LTR                     0x10
 #define LPSS_AUTO_LTR                   0x14
 
+struct lpss_shared_clock {
+        const char *name;
+        unsigned long rate;
+        struct clk *clk;
+};
+
 struct lpss_device_desc {
         bool clk_required;
         const char *clkdev_name;
         bool ltr_required;
         unsigned int prv_offset;
+        bool clk_gate;
+        struct lpss_shared_clock *shared_clock;
 };
 
 static struct lpss_device_desc lpss_dma_desc = {
@@ -56,6 +64,7 @@ static struct lpss_device_desc lpt_dev_desc = {
         .clk_required = true,
         .prv_offset = 0x800,
         .ltr_required = true,
+        .clk_gate = true,
 };
 
 static struct lpss_device_desc lpt_sdio_dev_desc = {
@@ -63,6 +72,45 @@ static struct lpss_device_desc lpt_sdio_dev_desc = {
         .ltr_required = true,
 };
 
+static struct lpss_shared_clock uart_clock = {
+        .name = "uart_clk",
+        .rate = 44236800,
+};
+
+static struct lpss_device_desc byt_uart_dev_desc = {
+        .clk_required = true,
+        .prv_offset = 0x800,
+        .clk_gate = true,
+        .shared_clock = &uart_clock,
+};
+
+static struct lpss_shared_clock spi_clock = {
+        .name = "spi_clk",
+        .rate = 50000000,
+};
+
+static struct lpss_device_desc byt_spi_dev_desc = {
+        .clk_required = true,
+        .prv_offset = 0x400,
+        .clk_gate = true,
+        .shared_clock = &spi_clock,
+};
+
+static struct lpss_device_desc byt_sdio_dev_desc = {
+        .clk_required = true,
+};
+
+static struct lpss_shared_clock i2c_clock = {
+        .name = "i2c_clk",
+        .rate = 100000000,
+};
+
+static struct lpss_device_desc byt_i2c_dev_desc = {
+        .clk_required = true,
+        .prv_offset = 0x800,
+        .shared_clock = &i2c_clock,
+};
+
 static const struct acpi_device_id acpi_lpss_device_ids[] = {
         /* Generic LPSS devices */
         { "INTL9C60", (unsigned long)&lpss_dma_desc },
@@ -77,6 +125,13 @@ static const struct acpi_device_id acpi_lpss_device_ids[] = {
         { "INT33C6", (unsigned long)&lpt_sdio_dev_desc },
         { "INT33C7", },
 
+        /* BayTrail LPSS devices */
+        { "80860F0A", (unsigned long)&byt_uart_dev_desc },
+        { "80860F0E", (unsigned long)&byt_spi_dev_desc },
+        { "80860F14", (unsigned long)&byt_sdio_dev_desc },
+        { "80860F41", (unsigned long)&byt_i2c_dev_desc },
+        { "INT33B2", },
+
         { }
 };
 
@@ -98,7 +153,10 @@ static int register_device_clock(struct acpi_device *adev,
                                  struct lpss_private_data *pdata)
 {
         const struct lpss_device_desc *dev_desc = pdata->dev_desc;
+        struct lpss_shared_clock *shared_clock = dev_desc->shared_clock;
+        struct clk *clk = ERR_PTR(-ENODEV);
         struct lpss_clk_data *clk_data;
+        const char *parent;
 
         if (!lpss_clk_dev)
                 lpt_register_clock_device();
@@ -117,14 +175,30 @@ static int register_device_clock(struct acpi_device *adev,
             || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
                 return -ENODATA;
 
-        pdata->clk = clk_register_gate(NULL, dev_name(&adev->dev),
-                                       clk_data->name, 0,
-                                       pdata->mmio_base + dev_desc->prv_offset,
-                                       0, 0, NULL);
-        if (IS_ERR(pdata->clk))
-                return PTR_ERR(pdata->clk);
+        parent = clk_data->name;
+
+        if (shared_clock) {
+                clk = shared_clock->clk;
+                if (!clk) {
+                        clk = clk_register_fixed_rate(NULL, shared_clock->name,
+                                                      "lpss_clk", 0,
+                                                      shared_clock->rate);
+                        shared_clock->clk = clk;
+                }
+                parent = shared_clock->name;
+        }
+
+        if (dev_desc->clk_gate) {
+                clk = clk_register_gate(NULL, dev_name(&adev->dev), parent, 0,
+                                        pdata->mmio_base + dev_desc->prv_offset,
+                                        0, 0, NULL);
+                pdata->clk = clk;
+        }
+
+        if (IS_ERR(clk))
+                return PTR_ERR(clk);
 
-        clk_register_clkdev(pdata->clk, NULL, dev_name(&adev->dev));
+        clk_register_clkdev(clk, NULL, dev_name(&adev->dev));
         return 0;
 }
 
diff --git a/drivers/clk/x86/clk-lpt.c b/drivers/clk/x86/clk-lpt.c
index 4f45eee9e33b..812f83f8b0c6 100644
--- a/drivers/clk/x86/clk-lpt.c
+++ b/drivers/clk/x86/clk-lpt.c
@@ -1,5 +1,5 @@
 /*
- * Intel Lynxpoint LPSS clocks.
+ * Intel Low Power Subsystem clocks.
  *
  * Copyright (C) 2013, Intel Corporation
  * Authors: Mika Westerberg <mika.westerberg@linux.intel.com>
@@ -18,8 +18,6 @@
 #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;