In the RZ/G2L family, core clocks are always on and can't be disabled. However, drivers which are shared with other SoCs may call clk_enable() or clk_enable_bulk() for a clock referenced in the device tree which happens to be a core clock on the RZ/G2L. To avoid the need for conditionals in these drivers, simply ignore attempts to enable a core clock.
Signed-off-by: Paul Barker paul.barker.ct@bp.renesas.com Reviewed-by: Marek Vasut marek.vasut+renesas@mailbox.org --- Changes v1->v2: - Split out of series adding RZ/G2L Ethernet support [1] - Added Marek's Reviewed-by tag
[1]: https://lore.kernel.org/all/20241024152448.102-1-paul.barker.ct@bp.renesas.c...
drivers/clk/renesas/rzg2l-cpg.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/clk/renesas/rzg2l-cpg.c b/drivers/clk/renesas/rzg2l-cpg.c index c8735d869cf9..3c5340df8eed 100644 --- a/drivers/clk/renesas/rzg2l-cpg.c +++ b/drivers/clk/renesas/rzg2l-cpg.c @@ -69,7 +69,15 @@ static int rzg2l_cpg_clk_set(struct clk *clk, bool enable)
dev_dbg(clk->dev, "%s %s clock %u\n", enable ? "enable" : "disable", is_mod_clk(clk->id) ? "module" : "core", cpg_clk_id); + if (!is_mod_clk(clk->id)) { + /* + * Non-module clocks are always on. Ignore attempts to enable + * them and reject attempts to disable them. + */ + if (enable) + return 0; + dev_err(clk->dev, "ID %lu is not a module clock\n", clk->id); return -EINVAL; }