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SubjectRe: [PATCH v8 3/3] mailbox: qcom: Add support for APCS clock controller
On 06/23, Georgi Djakov wrote:
> diff --git a/drivers/mailbox/qcom-apcs-ipc-mailbox.c b/drivers/mailbox/qcom-apcs-ipc-mailbox.c
> index 9924c6d7f05d..da363c6580da 100644
> --- a/drivers/mailbox/qcom-apcs-ipc-mailbox.c
> +++ b/drivers/mailbox/qcom-apcs-ipc-mailbox.c
> @@ -11,6 +11,8 @@
> * GNU General Public License for more details.
> */
>
> +#include <linux/clk.h>
> +#include <linux/clk-provider.h>
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/io.h>
> @@ -19,6 +21,34 @@
> #include <linux/of_platform.h>
> #include <linux/platform_device.h>
> #include <linux/mailbox_controller.h>
> +#include <linux/regmap.h>
> +
> +#include "../clk/qcom/clk-regmap.h"
> +#include "../clk/qcom/clk-regmap-mux-div.h"

Why?

> +
> +
> +static int msm8916_register_clk(struct device *dev, void __iomem *base)
> +{
> + struct clk_regmap_mux_div *a53cc;
> + struct clk *pclk;
> + struct regmap *regmap;
> + struct clk_init_data init = { };
> + int ret;
> +
> + a53cc = devm_kzalloc(dev, sizeof(*a53cc), GFP_KERNEL);
> + if (!a53cc)
> + return -ENOMEM;
> +
> + a53cc->reg_offset = 0x50;
> + a53cc->hid_width = 5;
> + a53cc->hid_shift = 0;
> + a53cc->src_width = 3;
> + a53cc->src_shift = 8;
> + a53cc->parent_map = gpll0_a53cc_map;
> +
> + init.name = "a53mux";
> + init.parent_names = gpll0_a53cc;
> + init.num_parents = 2;

ARRAY_SIZE(gpll0_a53cc) instead of 2 please

> + init.ops = &clk_regmap_mux_div_ops;
> + init.flags = CLK_SET_RATE_PARENT;
> + a53cc->clkr.hw.init = &init;
> +
> + pclk = __clk_lookup(gpll0_a53cc[1]);

Urgh.. ok. We can't clk_get()?

> + if (!pclk)
> + return -EPROBE_DEFER;
> +
> + a53cc->clk_nb.notifier_call = a53cc_notifier_cb;
> + ret = clk_notifier_register(pclk, &a53cc->clk_nb);
> + if (ret) {
> + dev_err(dev, "failed to register clock notifier: %d\n", ret);
> + return ret;
> + }
> +
> + regmap = devm_regmap_init_mmio(dev, base, &a53cc_regmap_config);
> + if (IS_ERR(regmap)) {
> + ret = PTR_ERR(regmap);
> + dev_err(dev, "failed to init regmap mmio: %d\n", ret);
> + goto err;
> + }
> +
> + a53cc->clkr.regmap = regmap;
> +
> + ret = devm_clk_register_regmap(dev, &a53cc->clkr);

Regmap is not a requirement to work with the qcom clk driver.

> + if (ret) {
> + dev_err(dev, "failed to register regmap clock: %d\n", ret);
> + goto err;
> + }
> +
> + ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_simple_get,
> + &a53cc->clkr.hw);
> + if (ret) {
> + dev_err(dev, "failed to add clock provider: %d\n", ret);
> + goto err;
> + }
> +
> + return 0;
> +
> +err:
> + clk_notifier_unregister(pclk, &a53cc->clk_nb);
> + return ret;
> +}
> +
> static int qcom_apcs_ipc_probe(struct platform_device *pdev)
> {
> + struct device_node *np = pdev->dev.of_node;
> struct qcom_apcs_ipc *apcs;
> struct resource *res;
> unsigned long offset;
> @@ -63,6 +178,13 @@ static int qcom_apcs_ipc_probe(struct platform_device *pdev)
> if (IS_ERR(base))
> return PTR_ERR(base);
>
> + if (of_device_is_compatible(np, "qcom,msm8916-apcs-kpss-global")) {
> + /* register the APCS mux and divider clock */
> + ret = msm8916_register_clk(&pdev->dev, base);

Register a child platform device here instead of creating clks in the
same driver?

> + if (ret)
> + return ret;
> + }
> +
> offset = (unsigned long)of_device_get_match_data(&pdev->dev);
>
> apcs->reg = base + offset;

--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
a Linux Foundation Collaborative Project

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