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Subject[TEGRA194_CPUFREQ Patch 1/3] firmware: tegra: adding function to get BPMP data
Date
Adding new function of_tegra_bpmp_get() to get BPMP data.
This function can be used by other drivers like cpufreq to
get BPMP data without adding any property in respective
drivers DT node.

Signed-off-by: Sumit Gupta <sumitg@nvidia.com>
---
drivers/firmware/tegra/bpmp.c | 38 ++++++++++++++++++++++++++++++++++++++
include/soc/tegra/bpmp.h | 5 +++++
2 files changed, 43 insertions(+)

diff --git a/drivers/firmware/tegra/bpmp.c b/drivers/firmware/tegra/bpmp.c
index 6741fcd..9c3d7f1 100644
--- a/drivers/firmware/tegra/bpmp.c
+++ b/drivers/firmware/tegra/bpmp.c
@@ -38,6 +38,44 @@ channel_to_ops(struct tegra_bpmp_channel *channel)
return bpmp->soc->ops;
}

+struct tegra_bpmp *of_tegra_bpmp_get(void)
+{
+ struct platform_device *pdev;
+ struct device_node *bpmp_dev;
+ struct tegra_bpmp *bpmp;
+
+ /* Check for bpmp device status in DT */
+ bpmp_dev = of_find_compatible_node(NULL, NULL, "nvidia,tegra186-bpmp");
+ if (!bpmp_dev) {
+ bpmp = ERR_PTR(-ENODEV);
+ goto err_out;
+ }
+ if (!of_device_is_available(bpmp_dev)) {
+ bpmp = ERR_PTR(-ENODEV);
+ goto err_put;
+ }
+
+ pdev = of_find_device_by_node(bpmp_dev);
+ if (!pdev) {
+ bpmp = ERR_PTR(-ENODEV);
+ goto err_put;
+ }
+
+ bpmp = platform_get_drvdata(pdev);
+ if (!bpmp) {
+ bpmp = ERR_PTR(-EPROBE_DEFER);
+ put_device(&pdev->dev);
+ goto err_put;
+ }
+
+ return bpmp;
+err_put:
+ of_node_put(bpmp_dev);
+err_out:
+ return bpmp;
+}
+EXPORT_SYMBOL_GPL(of_tegra_bpmp_get);
+
struct tegra_bpmp *tegra_bpmp_get(struct device *dev)
{
struct platform_device *pdev;
diff --git a/include/soc/tegra/bpmp.h b/include/soc/tegra/bpmp.h
index f2604e9..21402d9 100644
--- a/include/soc/tegra/bpmp.h
+++ b/include/soc/tegra/bpmp.h
@@ -107,6 +107,7 @@ struct tegra_bpmp_message {
};

#if IS_ENABLED(CONFIG_TEGRA_BPMP)
+struct tegra_bpmp *of_tegra_bpmp_get(void);
struct tegra_bpmp *tegra_bpmp_get(struct device *dev);
void tegra_bpmp_put(struct tegra_bpmp *bpmp);
int tegra_bpmp_transfer_atomic(struct tegra_bpmp *bpmp,
@@ -122,6 +123,10 @@ void tegra_bpmp_free_mrq(struct tegra_bpmp *bpmp, unsigned int mrq,
void *data);
bool tegra_bpmp_mrq_is_supported(struct tegra_bpmp *bpmp, unsigned int mrq);
#else
+static inline struct tegra_bpmp *of_tegra_bpmp_get(void)
+{
+ return ERR_PTR(-ENOTSUPP);
+}
static inline struct tegra_bpmp *tegra_bpmp_get(struct device *dev)
{
return ERR_PTR(-ENOTSUPP);
--
2.7.4
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