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authorJoseph Lo <josephl@nvidia.com>2019-05-29 11:21:35 +0300
committerThierry Reding <treding@nvidia.com>2020-05-12 23:48:42 +0300
commit0ac65fc946d3a15ff30cea28b38a00b9ba98217b (patch)
treea52d5434512c1a1854e4e81dd85d63c0e5339bfa /include/linux/clk
parenta3cba697a2a09e6769996d5265991a3228004d92 (diff)
downloadlinux-0ac65fc946d3a15ff30cea28b38a00b9ba98217b.tar.xz
clk: tegra: Implement Tegra210 EMC clock
The EMC clock needs to carefully coordinate with the EMC controller programming to make sure external memory can be properly clocked. Do so by hooking up the EMC clock with an EMC provider that will specify which rates are supported by the EMC and provide a callback to use for setting the clock rate at the EMC. Based on work by Peter De Schrijver <pdeschrijver@nvidia.com>. Signed-off-by: Joseph Lo <josephl@nvidia.com> Signed-off-by: Thierry Reding <treding@nvidia.com>
Diffstat (limited to 'include/linux/clk')
-rw-r--r--include/linux/clk/tegra.h24
1 files changed, 24 insertions, 0 deletions
diff --git a/include/linux/clk/tegra.h b/include/linux/clk/tegra.h
index 5b0bdb413460..3f01d43f0598 100644
--- a/include/linux/clk/tegra.h
+++ b/include/linux/clk/tegra.h
@@ -146,4 +146,28 @@ void tegra20_clk_set_emc_round_callback(tegra20_clk_emc_round_cb *round_cb,
void *cb_arg);
int tegra20_clk_prepare_emc_mc_same_freq(struct clk *emc_clk, bool same);
+struct tegra210_clk_emc_config {
+ unsigned long rate;
+ bool same_freq;
+ u32 value;
+
+ unsigned long parent_rate;
+ u8 parent;
+};
+
+struct tegra210_clk_emc_provider {
+ struct module *owner;
+ struct device *dev;
+
+ struct tegra210_clk_emc_config *configs;
+ unsigned int num_configs;
+
+ int (*set_rate)(struct device *dev,
+ const struct tegra210_clk_emc_config *config);
+};
+
+int tegra210_clk_emc_attach(struct clk *clk,
+ struct tegra210_clk_emc_provider *provider);
+void tegra210_clk_emc_detach(struct clk *clk);
+
#endif /* __LINUX_CLK_TEGRA_H_ */