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Some ARM64 Exynos chips are capable to control PLL clocks automatically.
For those chips, whether the PLL is controlled automatically or manually
is chosen in PLL_CON1 register with next bits:
[28] ENABLE_AUTOMATIC_CLKGATING
[1] MANUAL_PLL_CTRL
[0] AUTO_PLL_CTRL
The bl2 bootloader sets 0x10000001 value for some PLL_CON1 registers,
which means any attempt to control those PLLs manually (e.g.
disabling/enabling those PLLs or changing MUX parent clocks) would lead
to PLL lock timeout with error message like this:
Could not lock PLL ...
At the moment, all Samsung clock drivers implement manual clock control.
So in order to make it possible to control PLLs, corresponding PLL_CON1
registers should be set to 0x2 first.
Some older ARM64 chips don't implement the automatic clock control
though. It also might be desirable to configure some PLLs for manual
control, while keeping the default configuration for the rest. So it'd
convenient to choose this PLL mode for each CMU separately. Introduce
.manual_plls field to CMU structure to choose the PLL control mode.
Because it'll be initialized with "false" in all existing CMU
structures by default, it won't affect any existing clock drivers,
allowing for this feature to be enabled gradually when it's needed with
no change for the rest of users. In case .manual_plls is set, set
PLL_CON1 registers to manual control, akin to what's already done for
gate clocks in exynos_arm64_init_clocks(). Of course, PLL_CON1 registers
should be added to corresponding struct samsung_cmu_info::clk_regs array
to make sure they get initialized.
No functional change. This patch adds a feature, but doesn't enable it
for any users.
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20240301015118.30072-1-semen.protsenko@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> # samsung
Acked-by: Heiko Stuebner <heiko@sntech.de> #rockchip
Acked-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Reviewed-by: Luca Ceresoli <luca.ceresoli@bootlin.com> # versaclock5
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230718143156.1066339-1-robh@kernel.org
Acked-by: Abel Vesa <abel.vesa@linaro.org> #imx
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
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Exynos5433 clock driver implements PM support internally, which might be
also useful for other Exynos clock drivers. Extract all PM related code
from clk-exynos5433 to common ARM64 functions.
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20230307002423.24454-4-semen.protsenko@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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Extract parent clock enabling from exynos_arm64_register_cmu() to
dedicated function.
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Link: https://lore.kernel.org/r/20230307002423.24454-3-semen.protsenko@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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Rename exynos850_register_cmu to exynos_arm64_register_cmu and move it
to a new file called "clk-exynos-arm64.c".
This should have no functional changes, but it will allow this code to
be shared between other arm64 Exynos SoCs, like the Exynos7885 and
possibly ExynosAuto V9.
Signed-off-by: David Virag <virag.david003@gmail.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20211206153124.427102-5-virag.david003@gmail.com
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