From a3cba697a2a09e6769996d5265991a3228004d92 Mon Sep 17 00:00:00 2001 From: Joseph Lo Date: Wed, 29 May 2019 16:21:34 +0800 Subject: clk: tegra: Export functions for EMC clock scaling Export functions to allow accessing the CAR register required by EMC clock scaling. These functions will be used to access the CAR register as part of the scaling sequence. Signed-off-by: Joseph Lo Signed-off-by: Thierry Reding --- include/linux/clk/tegra.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'include/linux') diff --git a/include/linux/clk/tegra.h b/include/linux/clk/tegra.h index 2b1b35240074..5b0bdb413460 100644 --- a/include/linux/clk/tegra.h +++ b/include/linux/clk/tegra.h @@ -131,6 +131,9 @@ extern void tegra210_set_sata_pll_seq_sw(bool state); extern void tegra210_put_utmipll_in_iddq(void); extern void tegra210_put_utmipll_out_iddq(void); extern int tegra210_clk_handle_mbist_war(unsigned int id); +extern void tegra210_clk_emc_dll_enable(bool flag); +extern void tegra210_clk_emc_dll_update_setting(u32 emc_dll_src_value); +extern void tegra210_clk_emc_update_setting(u32 emc_src_value); struct clk; -- cgit v1.2.3 From 0ac65fc946d3a15ff30cea28b38a00b9ba98217b Mon Sep 17 00:00:00 2001 From: Joseph Lo Date: Wed, 29 May 2019 16:21:35 +0800 Subject: 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 . Signed-off-by: Joseph Lo Signed-off-by: Thierry Reding --- include/linux/clk/tegra.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) (limited to 'include/linux') 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_ */ -- cgit v1.2.3