From mboxrd@z Thu Jan 1 00:00:00 1970 From: nm@ti.com (Nishanth Menon) Date: Wed, 27 Jul 2011 15:02:32 -0500 Subject: [PATCH 1/2] OMAP: PM: omap_device: add omap_hwmod_name_get_odev Message-ID: To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org An API which translates a standard hwmod name to corresponding omap_device is useful for drivers when they need to look up the device associated with a hwmod name to map back into the device structure pointers. These ideally should be used by drivers in mach directory. Using a generic hwmod name like "gpu" instead of the actual device name which could change in the future, allows us to: a) Could in effect help replace apis such as omap2_get_mpuss_device, omap2_get_iva_device, omap2_get_l3_device, omap4_get_dsp_device, etc.. b) Scale to more devices rather than be restricted to named functions c) Simplify driver's platform_data from passing additional fields all doing the same thing with different function pointer names just for accessing a different device name. Change-Id: Ib42d22b4a929982c87a79866e3d7dc6e41073a6c Signed-off-by: Nishanth Menon --- arch/arm/plat-omap/include/plat/omap_device.h | 1 + arch/arm/plat-omap/omap_device.c | 32 +++++++++++++++++++++++++ 2 files changed, 33 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 70d31d0..7a3c046 100644 --- a/arch/arm/plat-omap/include/plat/omap_device.h +++ b/arch/arm/plat-omap/include/plat/omap_device.h @@ -102,6 +102,7 @@ int omap_device_register(struct omap_device *od); int omap_early_device_register(struct omap_device *od); void __iomem *omap_device_get_rt_va(struct omap_device *od); +struct omap_device *omap_hwmod_name_get_odev(const char *oh_name); /* OMAP PM interface */ int omap_device_align_pm_lat(struct platform_device *pdev, diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c index 92b4496..21df532 100644 --- a/arch/arm/plat-omap/omap_device.c +++ b/arch/arm/plat-omap/omap_device.c @@ -780,6 +780,38 @@ void __iomem *omap_device_get_rt_va(struct omap_device *od) return omap_hwmod_get_mpu_rt_va(od->hwmods[0]); } +/** + * omap_hwmod_name_get_odev() - convert a hwmod name to omap_device pointer + * @oh_name: name of the hwmod device + * + * returns back a struct omap_device * pointer associated with a hwmod + * device represented by a hwmod_name + */ +struct omap_device *omap_hwmod_name_get_odev(const char *oh_name) +{ + struct omap_hwmod *oh; + + if (!oh_name) { + WARN(1, "%s: no hwmod name!\n", __func__); + return ERR_PTR(-EINVAL); + } + + oh = omap_hwmod_lookup(oh_name); + if (IS_ERR_OR_NULL(oh)) { + WARN(1, "%s: no hwmod for %s\n", __func__, + oh_name); + return ERR_PTR(oh ? PTR_ERR(oh) : -ENODEV); + } + if (IS_ERR_OR_NULL(oh->od)) { + WARN(1, "%s: no omap_device for %s\n", __func__, + oh_name); + return ERR_PTR(oh->od ? PTR_ERR(oh->od) : -ENODEV); + } + + return oh->od; +} +EXPORT_SYMBOL(omap_hwmod_name_get_odev); + /* * Public functions intended for use in omap_device_pm_latency * .activate_func and .deactivate_func function pointers -- 1.7.4.1