clk: qcom: smd-rpm: Keep one rpm handle for all clocks

For no apparent reason (as there's just one RPM per SoC), all clocks
currently store a copy of a pointer to smd_rpm. Introduce a single,
global one to save up on space in each clk definition.

bloat-o-meter reports:

Total: Before=41887, After=40843, chg -2.49%
Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230501130400.107771-1-konrad.dybcio@linaro.org

drivers/clk/qcom/clk-smd-rpm.c

@@ -156,6 +156,8 @@
 
 #define to_clk_smd_rpm(_hw) container_of(_hw, struct clk_smd_rpm, hw)
 
+static struct qcom_smd_rpm *rpmcc_smd_rpm;
+
 struct clk_smd_rpm {
 	const int rpm_res_type;
 	const int rpm_key;
@@ -166,7 +168,6 @@ struct clk_smd_rpm {
 	struct clk_smd_rpm *peer;
 	struct clk_hw hw;
 	unsigned long rate;
-	struct qcom_smd_rpm *rpm;
 };
 
 struct clk_smd_rpm_req {
@@ -191,12 +192,12 @@ static int clk_smd_rpm_handoff(struct clk_smd_rpm *r)
 		.value = cpu_to_le32(r->branch ? 1 : INT_MAX),
 	};
 
-	ret = qcom_rpm_smd_write(r->rpm, QCOM_SMD_RPM_ACTIVE_STATE,
+	ret = qcom_rpm_smd_write(rpmcc_smd_rpm, QCOM_SMD_RPM_ACTIVE_STATE,
 				 r->rpm_res_type, r->rpm_clk_id, &req,
 				 sizeof(req));
 	if (ret)
 		return ret;
-	ret = qcom_rpm_smd_write(r->rpm, QCOM_SMD_RPM_SLEEP_STATE,
+	ret = qcom_rpm_smd_write(rpmcc_smd_rpm, QCOM_SMD_RPM_SLEEP_STATE,
 				 r->rpm_res_type, r->rpm_clk_id, &req,
 				 sizeof(req));
 	if (ret)
@@ -214,7 +215,7 @@ static int clk_smd_rpm_set_rate_active(struct clk_smd_rpm *r,
 		.value = cpu_to_le32(DIV_ROUND_UP(rate, 1000)), /* to kHz */
 	};
 
-	return qcom_rpm_smd_write(r->rpm, QCOM_SMD_RPM_ACTIVE_STATE,
+	return qcom_rpm_smd_write(rpmcc_smd_rpm, QCOM_SMD_RPM_ACTIVE_STATE,
 				  r->rpm_res_type, r->rpm_clk_id, &req,
 				  sizeof(req));
 }
@@ -228,7 +229,7 @@ static int clk_smd_rpm_set_rate_sleep(struct clk_smd_rpm *r,
 		.value = cpu_to_le32(DIV_ROUND_UP(rate, 1000)), /* to kHz */
 	};
 
-	return qcom_rpm_smd_write(r->rpm, QCOM_SMD_RPM_SLEEP_STATE,
+	return qcom_rpm_smd_write(rpmcc_smd_rpm, QCOM_SMD_RPM_SLEEP_STATE,
 				  r->rpm_res_type, r->rpm_clk_id, &req,
 				  sizeof(req));
 }
@@ -395,7 +396,7 @@ static unsigned long clk_smd_rpm_recalc_rate(struct clk_hw *hw,
 	return r->rate;
 }
 
-static int clk_smd_rpm_enable_scaling(struct qcom_smd_rpm *rpm)
+static int clk_smd_rpm_enable_scaling(void)
 {
 	int ret;
 	struct clk_smd_rpm_req req = {
@@ -404,7 +405,7 @@ static int clk_smd_rpm_enable_scaling(struct qcom_smd_rpm *rpm)
 		.value = cpu_to_le32(1),
 	};
 
-	ret = qcom_rpm_smd_write(rpm, QCOM_SMD_RPM_SLEEP_STATE,
+	ret = qcom_rpm_smd_write(rpmcc_smd_rpm, QCOM_SMD_RPM_SLEEP_STATE,
 				 QCOM_SMD_RPM_MISC_CLK,
 				 QCOM_RPM_SCALING_ENABLE_ID, &req, sizeof(req));
 	if (ret) {
@@ -412,7 +413,7 @@ static int clk_smd_rpm_enable_scaling(struct qcom_smd_rpm *rpm)
 		return ret;
 	}
 
-	ret = qcom_rpm_smd_write(rpm, QCOM_SMD_RPM_ACTIVE_STATE,
+	ret = qcom_rpm_smd_write(rpmcc_smd_rpm, QCOM_SMD_RPM_ACTIVE_STATE,
 				 QCOM_SMD_RPM_MISC_CLK,
 				 QCOM_RPM_SCALING_ENABLE_ID, &req, sizeof(req));
 	if (ret) {
@@ -1301,12 +1302,11 @@ static int rpm_smd_clk_probe(struct platform_device *pdev)
 {
 	int ret;
 	size_t num_clks, i;
-	struct qcom_smd_rpm *rpm;
 	struct clk_smd_rpm **rpm_smd_clks;
 	const struct rpm_smd_clk_desc *desc;
 
-	rpm = dev_get_drvdata(pdev->dev.parent);
-	if (!rpm) {
+	rpmcc_smd_rpm = dev_get_drvdata(pdev->dev.parent);
+	if (!rpmcc_smd_rpm) {
 		dev_err(&pdev->dev, "Unable to retrieve handle to RPM\n");
 		return -ENODEV;
 	}
@@ -1322,14 +1322,12 @@ static int rpm_smd_clk_probe(struct platform_device *pdev)
 		if (!rpm_smd_clks[i])
 			continue;
 
-		rpm_smd_clks[i]->rpm = rpm;
-
 		ret = clk_smd_rpm_handoff(rpm_smd_clks[i]);
 		if (ret)
 			goto err;
 	}
 
-	ret = clk_smd_rpm_enable_scaling(rpm);
+	ret = clk_smd_rpm_enable_scaling();
 	if (ret)
 		goto err;