clk: tegra: tegra124-emc: Fix potential memory leak

The tegra and tegra needs to be freed in the error handling path, otherwise
it will be leaked.

Fixes: 2db04f16b589 ("clk: tegra: Add EMC clock driver")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Link: https://lore.kernel.org/r/20221209094124.71043-1-yuancan@huawei.com
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: tegra: tegra124-emc: Fix missing put_device() call in emc_ensure_emc_driver

The reference taken by 'of_find_device_by_node()' must be released when
not needed anymore.
Add the corresponding 'put_device()' in the error handling path.

Fixes: 2db04f16b589 ("clk: tegra: Add EMC clock driver")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20220112104501.30655-1-linmq006@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

clk: tegra: tegra124-emc: Fix clock imbalance in emc_set_timing()

After calling clk_prepare_enable(), clk_disable_unprepare() needs
be called when prepare_timing_change() failed.

Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

memory: tegra124-emc: Make driver modular

Add modularization support to the Tegra124 EMC driver, which now can be
compiled as a loadable kernel module.

Note that EMC clock must be registered at clk-init time, otherwise PLLM
will be disabled as unused clock at boot time if EMC driver is compiled
as a module. Hence add a prepare/complete callbacks. similarly to what is
done for the Tegra20/30 EMC drivers.

Tested-by: Nicolas Chauvet <kwizart@gmail.com>
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20201228154920.18846-2-digetx@gmail.com
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

clk: tegra: Rename Tegra124 EMC clock source file

This code is only used on Tegra124, so rename it accordingly to make it
more consistent with other file names.

While at it, also get rid of the TEGRA_CLK_EMC Kconfig symbol that's
really just an alias for TEGRA124_EMC.

Signed-off-by: Thierry Reding <treding@nvidia.com>