Hi Stephen,
On 06/27/2017 01:47 AM, Stephen Boyd wrote:
> 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
Ok.
>
>> + 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()?
Ok, will do.
>
>> + 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.
>
The other option then is to drop the regmap-mux-div patch and switch
to readl()/writel().
>> + 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?
Ok, we can register a child platform device and create a separate driver
in drivers/clk. If we are dropping regmap, then we can also move the
mux-div clk ops and clk registration into the same file. I will give it
a try.
Thanks,
Georgi
>
>> + if (ret)
>> + return ret;
>> + }
>> +
>> offset = (unsigned long)of_device_get_match_data(&pdev->dev);
>>
>> apcs->reg = base + offset;
>
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