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SubjectRe: [PATCH v2 05/15] clk: qcom: gpucc-sm6375: Unregister critical clocks
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On 29/11/2023 18:59, Konrad Dybcio wrote:
> Some clocks need to be always-on, but we don't really do anything
> with them, other than calling enable() once and telling Linux they're
> enabled.
>
> Unregister them to save a couple of bytes and, perhaps more
> importantly, allow for runtime suspend of the clock controller device,
> as CLK_IS_CRITICAL prevents the latter.
>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> ---
> drivers/clk/qcom/gpucc-sm6375.c | 33 +++------------------------------
> 1 file changed, 3 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/clk/qcom/gpucc-sm6375.c b/drivers/clk/qcom/gpucc-sm6375.c
> index da24276a018e..6d85936dd441 100644
> --- a/drivers/clk/qcom/gpucc-sm6375.c
> +++ b/drivers/clk/qcom/gpucc-sm6375.c
> @@ -183,20 +183,6 @@ static struct clk_rcg2 gpucc_gx_gfx3d_clk_src = {
> },
> };
>
> -static struct clk_branch gpucc_ahb_clk = {
> - .halt_reg = 0x1078,
> - .halt_check = BRANCH_HALT_DELAY,
> - .clkr = {
> - .enable_reg = 0x1078,
> - .enable_mask = BIT(0),
> - .hw.init = &(struct clk_init_data){
> - .name = "gpucc_ahb_clk",
> - .flags = CLK_IS_CRITICAL,
> - .ops = &clk_branch2_ops,
> - },
> - },
> -};
> -
> static struct clk_branch gpucc_cx_gfx3d_clk = {
> .halt_reg = 0x10a4,
> .halt_check = BRANCH_HALT_DELAY,
> @@ -294,20 +280,6 @@ static struct clk_branch gpucc_cxo_clk = {
> },
> };
>
> -static struct clk_branch gpucc_gx_cxo_clk = {
> - .halt_reg = 0x1060,
> - .halt_check = BRANCH_HALT_DELAY,
> - .clkr = {
> - .enable_reg = 0x1060,
> - .enable_mask = BIT(0),
> - .hw.init = &(struct clk_init_data){
> - .name = "gpucc_gx_cxo_clk",
> - .flags = CLK_IS_CRITICAL,
> - .ops = &clk_branch2_ops,
> - },
> - },
> -};
> -
> static struct clk_branch gpucc_gx_gfx3d_clk = {
> .halt_reg = 0x1054,
> .halt_check = BRANCH_HALT_DELAY,
> @@ -381,7 +353,6 @@ static struct gdsc gpu_gx_gdsc = {
> };
>
> static struct clk_regmap *gpucc_sm6375_clocks[] = {
> - [GPU_CC_AHB_CLK] = &gpucc_ahb_clk.clkr,
> [GPU_CC_CX_GFX3D_CLK] = &gpucc_cx_gfx3d_clk.clkr,
> [GPU_CC_CX_GFX3D_SLV_CLK] = &gpucc_cx_gfx3d_slv_clk.clkr,
> [GPU_CC_CX_GMU_CLK] = &gpucc_cx_gmu_clk.clkr,
> @@ -389,7 +360,6 @@ static struct clk_regmap *gpucc_sm6375_clocks[] = {
> [GPU_CC_CXO_AON_CLK] = &gpucc_cxo_aon_clk.clkr,
> [GPU_CC_CXO_CLK] = &gpucc_cxo_clk.clkr,
> [GPU_CC_GMU_CLK_SRC] = &gpucc_gmu_clk_src.clkr,
> - [GPU_CC_GX_CXO_CLK] = &gpucc_gx_cxo_clk.clkr,
> [GPU_CC_GX_GFX3D_CLK] = &gpucc_gx_gfx3d_clk.clkr,
> [GPU_CC_GX_GFX3D_CLK_SRC] = &gpucc_gx_gfx3d_clk_src.clkr,
> [GPU_CC_GX_GMU_CLK] = &gpucc_gx_gmu_clk.clkr,
> @@ -455,6 +425,9 @@ static int gpucc_sm6375_probe(struct platform_device *pdev)
> clk_lucid_pll_configure(&gpucc_pll0, regmap, &gpucc_pll0_config);
> clk_lucid_pll_configure(&gpucc_pll1, regmap, &gpucc_pll1_config);
>
> + qcom_branch_set_clk_en(regmap, 0x1078); /* GPUCC_AHB_CLK */
> + qcom_branch_set_clk_en(regmap, 0x1060); /* GPUCC_GX_CXO_CLK */
> +
> ret = qcom_cc_really_probe(pdev, &gpucc_sm6375_desc, regmap);
> pm_runtime_put(&pdev->dev);
>
>

I think this makes sense for a CLK_IS_CRITICAL clock - why bother
enumerating halt regs/semantics we never use..

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

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