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Date: Tue, 09 Apr 2013 13:44:07 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc: "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
Mika Westerberg <mika.westerberg@...ux.intel.com>,
Viresh Kumar <viresh.kumar@...aro.org>,
linux-kernel@...r.kernel.org,
spear-devel <spear-devel@...t.st.com>,
Vinod Koul <vinod.koul@...el.com>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH v2 5/5] ACPI / LPSS: add support of shared clock
On Tuesday, April 09, 2013 02:05:47 PM Andy Shevchenko wrote:
> From: "Rafael J. Wysocki" <rjw@...k.pl>
Well, that should be
From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> The DMA controller in Lynxpoint is using the LPSS root clock as a functional
> clock to work properly. Proposed patch adds support of the shared clock. It
> also avoids hardcoding the 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 <rjw@...k.pl>
and accordingly:
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> ---
> drivers/acpi/acpi_lpss.c | 26 ++++++++++++++++++++++----
> drivers/clk/x86/clk-lpt.c | 15 +++++++++++----
> include/linux/platform_data/clk-lpss.h | 5 +++++
> 3 files changed, 38 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c
> index b1c9542..652fd5c 100644
> --- a/drivers/acpi/acpi_lpss.c
> +++ b/drivers/acpi/acpi_lpss.c
> @@ -35,11 +35,16 @@ ACPI_MODULE_NAME("acpi_lpss");
>
> struct lpss_device_desc {
> bool clk_required;
> - const char *clk_parent;
> + const char *clkdev_name;
> bool ltr_required;
> unsigned int prv_offset;
> };
>
> +static struct lpss_device_desc lpss_dma_desc = {
> + .clk_required = true,
> + .clkdev_name = "hclk",
> +};
> +
> struct lpss_private_data {
> void __iomem *mmio_base;
> resource_size_t mmio_size;
> @@ -49,7 +54,6 @@ struct lpss_private_data {
>
> static struct lpss_device_desc lpt_dev_desc = {
> .clk_required = true,
> - .clk_parent = "lpss_clk",
> .prv_offset = 0x800,
> .ltr_required = true,
> };
> @@ -60,6 +64,9 @@ static struct lpss_device_desc lpt_sdio_dev_desc = {
> };
>
> static const struct acpi_device_id acpi_lpss_device_ids[] = {
> + /* Generic LPSS devices */
> + { "INTL9C60", (unsigned long)&lpss_dma_desc },
> +
> /* Lynxpoint LPSS devices */
> { "INT33C0", (unsigned long)&lpt_dev_desc },
> { "INT33C1", (unsigned long)&lpt_dev_desc },
> @@ -91,16 +98,27 @@ 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_clk_data *clk_data;
>
> if (!lpss_clk_dev)
> lpt_register_clock_device();
>
> - if (!dev_desc->clk_parent || !pdata->mmio_base
> + clk_data = platform_get_drvdata(lpss_clk_dev);
> + if (!clk_data)
> + return -ENODEV;
> +
> + if (dev_desc->clkdev_name) {
> + clk_register_clkdev(clk_data->clk, dev_desc->clkdev_name,
> + dev_name(&adev->dev));
> + return 0;
> + }
> +
> + if (!pdata->mmio_base
> || pdata->mmio_size < dev_desc->prv_offset + LPSS_CLK_SIZE)
> return -ENODATA;
>
> pdata->clk = clk_register_gate(NULL, dev_name(&adev->dev),
> - dev_desc->clk_parent, 0,
> + clk_data->name, 0,
> pdata->mmio_base + dev_desc->prv_offset,
> 0, 0, NULL);
> if (IS_ERR(pdata->clk))
> diff --git a/drivers/clk/x86/clk-lpt.c b/drivers/clk/x86/clk-lpt.c
> index 5cf4f46..e70fae3f 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_kmalloc(&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;
> }
>
> diff --git a/include/linux/platform_data/clk-lpss.h b/include/linux/platform_data/clk-lpss.h
> index 528e73c..2390199 100644
> --- a/include/linux/platform_data/clk-lpss.h
> +++ b/include/linux/platform_data/clk-lpss.h
> @@ -13,6 +13,11 @@
> #ifndef __CLK_LPSS_H
> #define __CLK_LPSS_H
>
> +struct lpss_clk_data {
> + const char *name;
> + struct clk *clk;
> +};
> +
> extern int lpt_clk_init(void);
>
> #endif /* __CLK_LPSS_H */
>
--
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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