linux-kernel - Re: [PATCH 4/7] PCI: qcom: Use clk

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Message-ID: <20190208141738.GC773@centauri.lan>
Date:   Fri, 8 Feb 2019 15:17:38 +0100
From:   Niklas Cassel <niklas.cassel@...aro.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Stanimir Varbanov <svarbanov@...sol.com>,
        Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Khasim Syed Mohammed <khasim.mohammed@...aro.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Mark Rutland <mark.rutland@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Rob Herring <robh+dt@...nel.org>,
        Stephen Boyd <sboyd@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH 4/7] PCI: qcom: Use clk_bulk API for 2.4.0 controllers

On Fri, Jan 25, 2019 at 03:45:06PM -0800, Bjorn Andersson wrote:
> Before introducing the QCS404 platform, which uses the same PCIe
> controller as IPQ4019, migrate this to use the bulk clock API, in order
> to make the error paths slighly cleaner.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 48 +++++++-------------------
>  1 file changed, 13 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index a7f703556790..9d366fad2b7f 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -113,9 +113,8 @@ struct qcom_pcie_resources_2_3_2 {
>  };
>  
>  struct qcom_pcie_resources_2_4_0 {
> -	struct clk *aux_clk;
> -	struct clk *master_clk;
> -	struct clk *slave_clk;
> +	struct clk_bulk_data clks[3];
> +	int num_clks;
>  	struct reset_control *axi_m_reset;
>  	struct reset_control *axi_s_reset;
>  	struct reset_control *pipe_reset;
> @@ -638,18 +637,17 @@ static int qcom_pcie_get_resources_2_4_0(struct qcom_pcie *pcie)
>  	struct qcom_pcie_resources_2_4_0 *res = &pcie->res.v2_4_0;
>  	struct dw_pcie *pci = pcie->pci;
>  	struct device *dev = pci->dev;
> +	int ret;
>  
> -	res->aux_clk = devm_clk_get(dev, "aux");
> -	if (IS_ERR(res->aux_clk))
> -		return PTR_ERR(res->aux_clk);
> +	res->clks[0].id = "aux";
> +	res->clks[1].id = "master_bus";
> +	res->clks[2].id = "slave_bus";
>  
> -	res->master_clk = devm_clk_get(dev, "master_bus");
> -	if (IS_ERR(res->master_clk))
> -		return PTR_ERR(res->master_clk);
> +	res->num_clks = 3;
>  
> -	res->slave_clk = devm_clk_get(dev, "slave_bus");
> -	if (IS_ERR(res->slave_clk))
> -		return PTR_ERR(res->slave_clk);
> +	ret = devm_clk_bulk_get(dev, res->num_clks, res->clks);
> +	if (ret < 0)
> +		return ret;
>  
>  	res->axi_m_reset = devm_reset_control_get_exclusive(dev, "axi_m");
>  	if (IS_ERR(res->axi_m_reset))
> @@ -719,9 +717,7 @@ static void qcom_pcie_deinit_2_4_0(struct qcom_pcie *pcie)
>  	reset_control_assert(res->axi_m_sticky_reset);
>  	reset_control_assert(res->pwr_reset);
>  	reset_control_assert(res->ahb_reset);
> -	clk_disable_unprepare(res->aux_clk);
> -	clk_disable_unprepare(res->master_clk);
> -	clk_disable_unprepare(res->slave_clk);
> +	clk_bulk_disable_unprepare(res->num_clks, res->clks);
>  }
>  
>  static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
> @@ -850,23 +846,9 @@ static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
>  
>  	usleep_range(10000, 12000);
>  
> -	ret = clk_prepare_enable(res->aux_clk);
> -	if (ret) {
> -		dev_err(dev, "cannot prepare/enable iface clock\n");
> +	ret = clk_bulk_prepare_enable(res->num_clks, res->clks);
> +	if (ret)
>  		goto err_clk_aux;
> -	}
> -
> -	ret = clk_prepare_enable(res->master_clk);
> -	if (ret) {
> -		dev_err(dev, "cannot prepare/enable core clock\n");
> -		goto err_clk_axi_m;
> -	}
> -
> -	ret = clk_prepare_enable(res->slave_clk);
> -	if (ret) {
> -		dev_err(dev, "cannot prepare/enable phy clock\n");
> -		goto err_clk_axi_s;
> -	}
>  
>  	/* enable PCIe clocks and resets */
>  	val = readl(pcie->parf + PCIE20_PARF_PHY_CTRL);
> @@ -891,10 +873,6 @@ static int qcom_pcie_init_2_4_0(struct qcom_pcie *pcie)
>  
>  	return 0;
>  
> -err_clk_axi_s:
> -	clk_disable_unprepare(res->master_clk);
> -err_clk_axi_m:
> -	clk_disable_unprepare(res->aux_clk);
>  err_clk_aux:
>  	reset_control_assert(res->ahb_reset);
>  err_rst_ahb:
> -- 
> 2.18.0
> 

Reviewed-by: Niklas Cassel <niklas.cassel@...aro.org>