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Date: Wed, 5 Jun 2013 09:52:41 -0400 (EDT)
From: Nicolas Pitre <nicolas.pitre@...aro.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@....com>
cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
devicetree-discuss@...ts.ozlabs.org,
Pawel Moll <pawel.moll@....com>,
Samuel Ortiz <sameo@...ux.intel.com>,
Achin Gupta <achin.gupta@....com>,
Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>,
Amit Kucheria <amit.kucheria@...aro.org>,
Jon Medhurst <tixy@...aro.org>
Subject: Re: [RFC PATCH v2 1/2] drivers: mfd: refactor the vexpress config
bridge API
On Wed, 5 Jun 2013, Lorenzo Pieralisi wrote:
> From: Pawel Moll <pawel.moll@....com>
>
> The introduction of Serial Power Controller (SPC) requires the vexpress
> config interface to change slightly since the SPC memory mapped interface
> can be used as configuration bus but also for operating points
> programming and retrieval. The helper that allocates the bridge functions
> requires an additional parameter allowing to request component specific
> functions that need not be initialized through device tree bindings but
> just using simple look-up and statically defined constants.
>
> This patch introduces the necessary changes to the vexpress config layer
> to cater for the new vexpress bridge interface requirements.
>
> Cc: Samuel Ortiz <sameo@...ux.intel.com>
> Cc: Achin Gupta <achin.gupta@....com>
> Cc: Sudeep KarkadaNagesha <Sudeep.KarkadaNagesha@....com>
> Cc: Pawel Moll <pawel.moll@....com>
> Cc: Nicolas Pitre <nicolas.pitre@...aro.org>
> Cc: Amit Kucheria <amit.kucheria@...aro.org>
> Cc: Jon Medhurst <tixy@...aro.org>
> Signed-off-by: Pawel Moll <pawel.moll@....com>
Acked-by: Nicolas Pitre <nico@...aro.org>
> ---
> drivers/mfd/vexpress-config.c | 61 +++++++++++++++++++++++++++----------------
> drivers/mfd/vexpress-sysreg.c | 2 +-
> include/linux/vexpress.h | 16 ++++++++----
> 3 files changed, 51 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/mfd/vexpress-config.c b/drivers/mfd/vexpress-config.c
> index 84ce6b9..1af2b0e 100644
> --- a/drivers/mfd/vexpress-config.c
> +++ b/drivers/mfd/vexpress-config.c
> @@ -86,29 +86,13 @@ void vexpress_config_bridge_unregister(struct vexpress_config_bridge *bridge)
> }
> EXPORT_SYMBOL(vexpress_config_bridge_unregister);
>
> -
> -struct vexpress_config_func {
> - struct vexpress_config_bridge *bridge;
> - void *func;
> -};
> -
> -struct vexpress_config_func *__vexpress_config_func_get(struct device *dev,
> - struct device_node *node)
> +static struct vexpress_config_bridge *
> + vexpress_config_bridge_find(struct device_node *node)
> {
> - struct device_node *bridge_node;
> - struct vexpress_config_func *func;
> int i;
> + struct vexpress_config_bridge *res = NULL;
> + struct device_node *bridge_node = of_node_get(node);
>
> - if (WARN_ON(dev && node && dev->of_node != node))
> - return NULL;
> - if (dev && !node)
> - node = dev->of_node;
> -
> - func = kzalloc(sizeof(*func), GFP_KERNEL);
> - if (!func)
> - return NULL;
> -
> - bridge_node = of_node_get(node);
> while (bridge_node) {
> const __be32 *prop = of_get_property(bridge_node,
> "arm,vexpress,config-bridge", NULL);
> @@ -129,13 +113,46 @@ struct vexpress_config_func *__vexpress_config_func_get(struct device *dev,
>
> if (test_bit(i, vexpress_config_bridges_map) &&
> bridge->node == bridge_node) {
> - func->bridge = bridge;
> - func->func = bridge->info->func_get(dev, node);
> + res = bridge;
> break;
> }
> }
> mutex_unlock(&vexpress_config_bridges_mutex);
>
> + return res;
> +}
> +
> +
> +struct vexpress_config_func {
> + struct vexpress_config_bridge *bridge;
> + void *func;
> +};
> +
> +struct vexpress_config_func *__vexpress_config_func_get(
> + struct vexpress_config_bridge *bridge,
> + struct device *dev,
> + struct device_node *node,
> + const char *id)
> +{
> + struct vexpress_config_func *func;
> +
> + if (WARN_ON(dev && node && dev->of_node != node))
> + return NULL;
> + if (dev && !node)
> + node = dev->of_node;
> +
> + if (!bridge)
> + bridge = vexpress_config_bridge_find(node);
> + if (!bridge)
> + return NULL;
> +
> + func = kzalloc(sizeof(*func), GFP_KERNEL);
> + if (!func)
> + return NULL;
> +
> + func->bridge = bridge;
> + func->func = bridge->info->func_get(dev, node, id);
> +
> if (!func->func) {
> of_node_put(node);
> kfree(func);
> diff --git a/drivers/mfd/vexpress-sysreg.c b/drivers/mfd/vexpress-sysreg.c
> index 96a020b..d2599aa 100644
> --- a/drivers/mfd/vexpress-sysreg.c
> +++ b/drivers/mfd/vexpress-sysreg.c
> @@ -165,7 +165,7 @@ static u32 *vexpress_sysreg_config_data;
> static int vexpress_sysreg_config_tries;
>
> static void *vexpress_sysreg_config_func_get(struct device *dev,
> - struct device_node *node)
> + struct device_node *node, const char *id)
> {
> struct vexpress_sysreg_config_func *config_func;
> u32 site;
> diff --git a/include/linux/vexpress.h b/include/linux/vexpress.h
> index 6e7980d..50368e0 100644
> --- a/include/linux/vexpress.h
> +++ b/include/linux/vexpress.h
> @@ -68,7 +68,8 @@
> */
> struct vexpress_config_bridge_info {
> const char *name;
> - void *(*func_get)(struct device *dev, struct device_node *node);
> + void *(*func_get)(struct device *dev, struct device_node *node,
> + const char *id);
> void (*func_put)(void *func);
> int (*func_exec)(void *func, int offset, bool write, u32 *data);
> };
> @@ -87,12 +88,17 @@ void vexpress_config_complete(struct vexpress_config_bridge *bridge,
>
> struct vexpress_config_func;
>
> -struct vexpress_config_func *__vexpress_config_func_get(struct device *dev,
> - struct device_node *node);
> +struct vexpress_config_func *__vexpress_config_func_get(
> + struct vexpress_config_bridge *bridge,
> + struct device *dev,
> + struct device_node *node,
> + const char *id);
> +#define vexpress_config_func_get(bridge, id) \
> + __vexpress_config_func_get(bridge, NULL, NULL, id)
> #define vexpress_config_func_get_by_dev(dev) \
> - __vexpress_config_func_get(dev, NULL)
> + __vexpress_config_func_get(NULL, dev, NULL, NULL)
> #define vexpress_config_func_get_by_node(node) \
> - __vexpress_config_func_get(NULL, node)
> + __vexpress_config_func_get(NULL, NULL, node, NULL)
> void vexpress_config_func_put(struct vexpress_config_func *func);
>
> /* Both may sleep! */
> --
> 1.8.2.2
>
>
--
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