From: Rahul Tanwar rtanwar@maxlinear.com
[ Upstream commit a5d49bd369b8588c0ee9d4d0a2c0160558a3ab69 ]
In MxL's LGM SoC, gate clocks can be controlled either from CGU clk driver i.e. this driver or directly from power management driver/daemon. It is dependent on the power policy/profile requirements of the end product.
To support such use cases, provide option to override gate clks enable/disable by adding a flag GATE_CLK_HW which controls if these gate clks are controlled by HW i.e. this driver or overridden in order to allow it to be controlled by power profiles instead.
Reviewed-by: Yi xin Zhu yzhu@maxlinear.com Signed-off-by: Rahul Tanwar rtanwar@maxlinear.com Link: https://lore.kernel.org/r/bdc9c89317b5d338a6c4f1d49386b696e947a672.166564272... [sboyd@kernel.org: Add braces on many line if-else] Signed-off-by: Stephen Boyd sboyd@kernel.org Stable-dep-of: 106ef3bda210 ("clk: mxl: Fix a clk entry by adding relevant flags") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/clk/x86/clk-cgu.c | 16 +++++++++++++++- drivers/clk/x86/clk-cgu.h | 1 + 2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/clk/x86/clk-cgu.c b/drivers/clk/x86/clk-cgu.c index 1f7e93de67bc0..4278a687076c9 100644 --- a/drivers/clk/x86/clk-cgu.c +++ b/drivers/clk/x86/clk-cgu.c @@ -354,8 +354,22 @@ int lgm_clk_register_branches(struct lgm_clk_provider *ctx, hw = lgm_clk_register_fixed_factor(ctx, list); break; case CLK_TYPE_GATE: - hw = lgm_clk_register_gate(ctx, list); + if (list->gate_flags & GATE_CLK_HW) { + hw = lgm_clk_register_gate(ctx, list); + } else { + /* + * GATE_CLKs can be controlled either from + * CGU clk driver i.e. this driver or directly + * from power management driver/daemon. It is + * dependent on the power policy/profile requirements + * of the end product. To override control of gate + * clks from this driver, provide NULL for this index + * of gate clk provider. + */ + hw = NULL; + } break; + default: dev_err(ctx->dev, "invalid clk type\n"); return -EINVAL; diff --git a/drivers/clk/x86/clk-cgu.h b/drivers/clk/x86/clk-cgu.h index 0aa0f35d63a0b..73ce84345f81e 100644 --- a/drivers/clk/x86/clk-cgu.h +++ b/drivers/clk/x86/clk-cgu.h @@ -197,6 +197,7 @@ struct lgm_clk_branch { /* clock flags definition */ #define CLOCK_FLAG_VAL_INIT BIT(16) #define MUX_CLK_SW BIT(17) +#define GATE_CLK_HW BIT(18)
#define LGM_MUX(_id, _name, _pdata, _f, _reg, \ _shift, _width, _cf, _v) \