Re: [PATCH 7/9] drm/msm/dsi_phy_14nm: Replace parent names with clk_hw pointers

[Dmitry Baryshkov]

On Tue, 24 May 2022 at 00:38, Marijn Suijten
<marijn.suijten@xxxxxxxxxxxxxx> wrote:
>
> parent_hw pointers are easier to manage and cheaper to use than
> repeatedly formatting the parent name and subsequently leaving the clk
> framework to perform lookups based on that name.
>
> Signed-off-by: Marijn Suijten <marijn.suijten@xxxxxxxxxxxxxx>

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

Nit: my rant regarding syntax changes applies here too.

> ---
>  drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c | 36 ++++++++++------------
>  1 file changed, 17 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
> index 8199c53567f4..574f95ab2f22 100644
> --- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
> +++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_14nm.c
> @@ -764,14 +764,14 @@ static int dsi_14nm_set_usecase(struct msm_dsi_phy *phy)
>
>  static struct clk_hw *pll_14nm_postdiv_register(struct dsi_pll_14nm *pll_14nm,
>                                                 const char *name,
> -                                               const char *parent_name,
> +                                               const struct clk_hw *parent_hw,
>                                                 unsigned long flags,
>                                                 u8 shift)
>  {
>         struct dsi_pll_14nm_postdiv *pll_postdiv;
>         struct device *dev = &pll_14nm->phy->pdev->dev;
>         struct clk_init_data postdiv_init = {
> -               .parent_names = (const char *[]) { parent_name },
> +               .parent_hws = (const struct clk_hw *[]) { parent_hw },
>                 .num_parents = 1,
>                 .name = name,
>                 .flags = flags,
> @@ -800,7 +800,7 @@ static struct clk_hw *pll_14nm_postdiv_register(struct dsi_pll_14nm *pll_14nm,
>
>  static int pll_14nm_register(struct dsi_pll_14nm *pll_14nm, struct clk_hw **provided_clocks)
>  {
> -       char clk_name[32], parent[32], vco_name[32];
> +       char clk_name[32], vco_name[32];
>         struct clk_init_data vco_init = {
>                 .parent_data = &(const struct clk_parent_data) {
>                         .fw_name = "ref",
> @@ -811,7 +811,7 @@ static int pll_14nm_register(struct dsi_pll_14nm *pll_14nm, struct clk_hw **prov
>                 .ops = &clk_ops_dsi_pll_14nm_vco,
>         };
>         struct device *dev = &pll_14nm->phy->pdev->dev;
> -       struct clk_hw *hw;
> +       struct clk_hw *hw, *n1_postdiv, *n1_postdivby2;
>         int ret;
>
>         DBG("DSI%d", pll_14nm->phy->id);
> @@ -824,48 +824,46 @@ static int pll_14nm_register(struct dsi_pll_14nm *pll_14nm, struct clk_hw **prov
>                 return ret;
>
>         snprintf(clk_name, 32, "dsi%dn1_postdiv_clk", pll_14nm->phy->id);
> -       snprintf(parent, 32, "dsi%dvco_clk", pll_14nm->phy->id);
>
>         /* N1 postdiv, bits 0-3 in REG_DSI_14nm_PHY_CMN_CLK_CFG0 */
> -       hw = pll_14nm_postdiv_register(pll_14nm, clk_name, parent,
> -                                      CLK_SET_RATE_PARENT, 0);
> -       if (IS_ERR(hw))
> -               return PTR_ERR(hw);
> +       n1_postdiv = pll_14nm_postdiv_register(pll_14nm, clk_name,
> +                       &pll_14nm->clk_hw, CLK_SET_RATE_PARENT, 0);
> +       if (IS_ERR(n1_postdiv))
> +               return PTR_ERR(n1_postdiv);
>
>         snprintf(clk_name, 32, "dsi%dpllbyte", pll_14nm->phy->id);
> -       snprintf(parent, 32, "dsi%dn1_postdiv_clk", pll_14nm->phy->id);
>
>         /* DSI Byte clock = VCO_CLK / N1 / 8 */
> -       hw = devm_clk_hw_register_fixed_factor(dev, clk_name, parent,
> -                                         CLK_SET_RATE_PARENT, 1, 8);
> +       hw = devm_clk_hw_register_fixed_factor_parent_hw(dev, clk_name,
> +                       n1_postdiv, CLK_SET_RATE_PARENT, 1, 8);
>         if (IS_ERR(hw))
>                 return PTR_ERR(hw);
>
>         provided_clocks[DSI_BYTE_PLL_CLK] = hw;
>
>         snprintf(clk_name, 32, "dsi%dn1_postdivby2_clk", pll_14nm->phy->id);
> -       snprintf(parent, 32, "dsi%dn1_postdiv_clk", pll_14nm->phy->id);
>
>         /*
>          * Skip the mux for now, force DSICLK_SEL to 1, Add a /2 divider
>          * on the way. Don't let it set parent.
>          */
> -       hw = devm_clk_hw_register_fixed_factor(dev, clk_name, parent, 0, 1, 2);
> -       if (IS_ERR(hw))
> -               return PTR_ERR(hw);
> +       n1_postdivby2 = devm_clk_hw_register_fixed_factor_parent_hw(dev,
> +                       clk_name, n1_postdiv, 0, 1, 2);
> +       if (IS_ERR(n1_postdivby2))
> +               return PTR_ERR(n1_postdivby2);
>
>         snprintf(clk_name, 32, "dsi%dpll", pll_14nm->phy->id);
> -       snprintf(parent, 32, "dsi%dn1_postdivby2_clk", pll_14nm->phy->id);
>
>         /* DSI pixel clock = VCO_CLK / N1 / 2 / N2
>          * This is the output of N2 post-divider, bits 4-7 in
>          * REG_DSI_14nm_PHY_CMN_CLK_CFG0. Don't let it set parent.
>          */
> -       hw = pll_14nm_postdiv_register(pll_14nm, clk_name, parent, 0, 4);
> +       hw = pll_14nm_postdiv_register(pll_14nm, clk_name, n1_postdivby2,
> +                       0, 4);
>         if (IS_ERR(hw))
>                 return PTR_ERR(hw);
>
> -       provided_clocks[DSI_PIXEL_PLL_CLK]      = hw;
> +       provided_clocks[DSI_PIXEL_PLL_CLK] = hw;
>
>         return 0;
>  }
> --
> 2.36.1
>


-- 
With best wishes
Dmitry