linux-kernel - [PATCH] spi: meson-spicc: set SPI clock flag CLK_SET_RATE

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Message-Id: <20240524-spi_pclk_setparent-v1-1-99e0ce70b66f@amlogic.com>
Date: Fri, 24 May 2024 14:35:09 +0800
From: Xianwei Zhao via B4 Relay <devnull+xianwei.zhao.amlogic.com@...nel.org>
To: Mark Brown <broonie@...nel.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>, 
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc: linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 Xianwei Zhao <xianwei.zhao@...ogic.com>, Sunny Luo <sunny.luo@...ogic.com>
Subject: [PATCH] spi: meson-spicc: set SPI clock flag CLK_SET_RATE_PARENT

From: Xianwei Zhao <xianwei.zhao@...ogic.com>

Add SPI clock flag CLK_SET_RATE_PARENT for using pclk as parent clock.
This gives SPI more flexibility in frequency selection.

Signed-off-by: Xianwei Zhao <xianwei.zhao@...ogic.com>
Signed-off-by: Sunny Luo <sunny.luo@...ogic.com>
---
 drivers/spi/spi-meson-spicc.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/spi/spi-meson-spicc.c b/drivers/spi/spi-meson-spicc.c
index fc75492e50ff..8a4a8ba9dfed 100644
--- a/drivers/spi/spi-meson-spicc.c
+++ b/drivers/spi/spi-meson-spicc.c
@@ -644,11 +644,13 @@ static int meson_spicc_pow2_clk_init(struct meson_spicc_device *spicc)
 	snprintf(name, sizeof(name), "%s#pow2_fixed_div", dev_name(dev));
 	init.name = name;
 	init.ops = &clk_fixed_factor_ops;
-	init.flags = 0;
-	if (spicc->data->has_pclk)
+	if (spicc->data->has_pclk) {
+		init.flags = CLK_SET_RATE_PARENT;
 		parent_data[0].hw = __clk_get_hw(spicc->pclk);
-	else
+	} else {
+		init.flags = 0;
 		parent_data[0].hw = __clk_get_hw(spicc->core);
+	}
 	init.num_parents = 1;
 
 	pow2_fixed_div->mult = 1,
@@ -708,11 +710,13 @@ static int meson_spicc_enh_clk_init(struct meson_spicc_device *spicc)
 	snprintf(name, sizeof(name), "%s#enh_fixed_div", dev_name(dev));
 	init.name = name;
 	init.ops = &clk_fixed_factor_ops;
-	init.flags = 0;
-	if (spicc->data->has_pclk)
+	if (spicc->data->has_pclk) {
+		init.flags = CLK_SET_RATE_PARENT;
 		parent_data[0].hw = __clk_get_hw(spicc->pclk);
-	else
+	} else {
+		init.flags = 0;
 		parent_data[0].hw = __clk_get_hw(spicc->core);
+	}
 	init.num_parents = 1;
 
 	enh_fixed_div->mult = 1,

---
base-commit: 3aac9f4885922ad0fc01b86f85903768219475a3
change-id: 20240524-spi_pclk_setparent-6da29325c113

Best regards,
-- 
Xianwei Zhao <xianwei.zhao@...ogic.com>