[PATCH 2/5] clk: stm32mp1: Add parent_data to ETHRX clock

[Stephen Boyd]

Quoting Marek Vasut (2022-01-18 12:29:55)
> Pass parent_data to ETHRX clock with new fw_name = "ETH_RX_CLK/ETH_REF_CLK".
> By default, this change has no impact on the operation of the clock driver.
> However, due to the fw_name, it permits DT to override ETHRX clock parent,
> which might be needed in case the ETHRX clock are supplied by external clock
> source.
> 
> Example of MCO2 supplying clock to ETH_RX_CLK via external pad-to-pad wire:
> &rcc {
>          clocks = <&rcc CK_MCO2>;
>          clock-names = "ETH_RX_CLK/ETH_REF_CLK";
> };
> 
> Note that while this patch permits to implement this rare usecase, the issue
> with ethernet RX and TX input clock modeling on MP1 is far more complex and
> requires more core plumbing.
> 
> [1] STM32MP1 Reference Manual RM0436 Rev 3, Page 574,
>     Figure 83. Peripheral clock distribution for Ethernet
>     https://www.st.com/resource/en/reference_manual/dm00327659-stm32mp157-advanced-armbased-32bit-mpus-stmicroelectronics.pdf
> 
> Signed-off-by: Marek Vasut <marex at denx.de>
> Cc: Alexandre Torgue <alexandre.torgue at foss.st.com>
> Cc: Christophe Roullier <christophe.roullier at foss.st.com>
> Cc: Gabriel Fernandez <gabriel.fernandez at foss.st.com>
> Cc: Patrice Chotard <patrice.chotard at foss.st.com>
> Cc: Patrick Delaunay <patrick.delaunay at foss.st.com>
> Cc: Stephen Boyd <sboyd at kernel.org>
> Cc: linux-clk at vger.kernel.org
> Cc: linux-stm32 at st-md-mailman.stormreply.com
> To: linux-arm-kernel at lists.infradead.org
> ---

Applied to clk-next