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Document support for spread spectrum clocking (SSC) on RTL8211F(D)(I)-CG, RTL8211FS(I)(-VS)-CG, RTL8211FG(I)(-VS)-CG PHYs. Introduce DT properties 'realtek,clkout-ssc-enable', 'realtek,rxc-ssc-enable' and 'realtek,sysclk-ssc-enable' which control CLKOUT, RXC and SYSCLK SSC spread spectrum clocking enablement on these signals. These clock are not exposed via the clock API, therefore assigned-clock-sscs property does not apply. Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com> Signed-off-by: Marek Vasut <marek.vasut@mailbox.org> Link: https://patch.msgid.link/20260405233008.148974-2-marek.vasut@mailbox.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>