Vishwanath BS <vishwanath...@ti.com> writes:
> From: Thara Gopinath <th...@ti.com>
>
> This patch extends the omap_device structure to contain pointers to scale the
> operating rate of the device and to retrieve the operating rate of the device.
> This patch also adds the three new APIs in the omap device layer
> namely omap_device_set_rate that can be called to set a new operating
> rate for a device, omap_device_get_rate that can be called to retrieve
> the operating frequency for a device and omap_device_register_dvfs_callbacks
> to register the device specific set_rate and get_rate functions.
> The omap_device_set_rate and omap_device_get_rate does some routine error
> checks and finally calls into the device specific set_rate
> and get_rate APIs populated through omap_device_populate_rate_fns.
>
> Signed-off-by: Thara Gopinath <th...@ti.com>
> Signed-off-by: Vishwanath BS <vishwanath...@ti.com>
> ---
> arch/arm/plat-omap/include/plat/omap_device.h | 9 +++++
> arch/arm/plat-omap/omap_device.c | 49
> +++++++++++++++++++++++++
> 2 files changed, 58 insertions(+), 0 deletions(-)
>
> diff --git a/arch/arm/plat-omap/include/plat/omap_device.h
> b/arch/arm/plat-omap/include/plat/omap_device.h
> index e4c349f..204fb0a 100644
> --- a/arch/arm/plat-omap/include/plat/omap_device.h
> +++ b/arch/arm/plat-omap/include/plat/omap_device.h
> @@ -50,6 +50,8 @@ extern struct device omap_device_parent;
> * @hwmods: (one .. many per omap_device)
> * @hwmods_cnt: ARRAY_SIZE() of @hwmods
> * @pm_lats: ptr to an omap_device_pm_latency table
> + * @set_rate: fn ptr to change the operating rate.
> + * @get_rate: fn ptr to retrieve the current operating rate.
> * @pm_lats_cnt: ARRAY_SIZE() of what is passed to @pm_lats
> * @pm_lat_level: array index of the last odpl entry executed - -1 if never
> * @dev_wakeup_lat: dev wakeup latency in nanoseconds
> @@ -73,6 +75,8 @@ struct omap_device {
> s8 pm_lat_level;
> u8 hwmods_cnt;
> u8 _state;
> + int (*set_rate)(struct device *dev, unsigned long rate);
> + unsigned long (*get_rate) (struct device *dev);
> };
>
> /* Device driver interface (call via platform_data fn ptrs) */
> @@ -107,6 +111,11 @@ void __iomem *omap_device_get_rt_va(struct omap_device
> *od);
> int omap_device_align_pm_lat(struct platform_device *pdev,
> u32 new_wakeup_lat_limit);
> struct powerdomain *omap_device_get_pwrdm(struct omap_device *od);
> +int omap_device_set_rate(struct device *dev, unsigned long freq);
> +unsigned long omap_device_get_rate(struct device *dev);
> +void omap_device_register_dvfs_callbacks(struct device *dev,
> + int (*set_rate)(struct device *dev, unsigned long rate),
> + unsigned long (*get_rate) (struct device *dev));
> u32 omap_device_get_context_loss_count(struct platform_device *pdev);
>
> /* Other */
> diff --git a/arch/arm/plat-omap/omap_device.c
> b/arch/arm/plat-omap/omap_device.c
> index a84e849..4cee430 100644
> --- a/arch/arm/plat-omap/omap_device.c
> +++ b/arch/arm/plat-omap/omap_device.c
> @@ -810,6 +810,55 @@ int omap_device_enable_clocks(struct omap_device *od)
> return 0;
> }
>
> +int omap_device_set_rate(struct device *dev, unsigned long freq)
> +{
> + struct platform_device *pdev;
> + struct omap_device *od;
> +
> + pdev = container_of(dev, struct platform_device, dev);
There is a macro for this in device.h:
pdev = to_platform_device(dev)
This needs to be fixed all over this series.
> + od = _find_by_pdev(pdev);
> +
> + if (!od->set_rate) {
> + dev_err(dev, "%s: No set_rate API for scaling device\n",
> + __func__);
> + return -ENODATA;
> + }
> +
> + return od->set_rate(dev, freq);
> +}
> +
> +unsigned long omap_device_get_rate(struct device *dev)
> +{
> + struct platform_device *pdev;
> + struct omap_device *od;
> +
> + pdev = container_of(dev, struct platform_device, dev);
> + od = _find_by_pdev(pdev);
Should also check here for a valid omap_device, but making sure its
parent is omap_device_parent.
> +
> +
> + if (!od->get_rate) {
> + dev_err(dev, "%s: No get rate API for the device\n",
> + __func__);
> + return 0;
> + }
> +
> + return od->get_rate(dev);
> +}
> +
> +void omap_device_register_dvfs_callbacks(struct device *dev,
> + int (*set_rate)(struct device *dev, unsigned long rate),
> + unsigned long (*get_rate) (struct device *dev))
> +{
> + struct platform_device *pdev;
> + struct omap_device *od;
> +
> + pdev = container_of(dev, struct platform_device, dev);
> + od = _find_by_pdev(pdev);
> +
and here
> + od->set_rate = set_rate;
> + od->get_rate = get_rate;
> +}
> +
> struct device omap_device_parent = {
> .init_name = "omap",
> .parent = &platform_bus,
Kevin
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