[PATCH v1] spi: spi-mtk-nor: add axi clock control for MT8192 spi-nor

[Bayi Cheng]

From: bayi cheng <bayi.ch...@mediatek.com>

MT8192 spi-nor is an independent sub system, we need extra control axi
bus clock for it. Add support for the additional axi clock to allow it
to be configured appropriately.

Signed-off-by: bayi cheng <bayi.ch...@mediatek.com>
---
 drivers/spi/spi-mtk-nor.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-mtk-nor.c b/drivers/spi/spi-mtk-nor.c
index b97f26a..bf2d0f9 100644
--- a/drivers/spi/spi-mtk-nor.c
+++ b/drivers/spi/spi-mtk-nor.c
@@ -103,6 +103,7 @@ struct mtk_nor {
        dma_addr_t buffer_dma;
        struct clk *spi_clk;
        struct clk *ctlr_clk;
+       struct clk *axi_clk;
        unsigned int spi_freq;
        bool wbuf_en;
        bool has_irq;
@@ -672,6 +673,7 @@ static void mtk_nor_disable_clk(struct mtk_nor *sp)
 {
        clk_disable_unprepare(sp->spi_clk);
        clk_disable_unprepare(sp->ctlr_clk);
+       clk_disable_unprepare(sp->axi_clk);
 }
 
 static int mtk_nor_enable_clk(struct mtk_nor *sp)
@@ -688,6 +690,13 @@ static int mtk_nor_enable_clk(struct mtk_nor *sp)
                return ret;
        }
 
+       ret = clk_prepare_enable(sp->axi_clk);
+       if (ret) {
+               clk_disable_unprepare(sp->spi_clk);
+               clk_disable_unprepare(sp->ctlr_clk);
+               return ret;
+       }
+
        return 0;
 }
 
@@ -746,7 +755,7 @@ static int mtk_nor_probe(struct platform_device *pdev)
        struct spi_controller *ctlr;
        struct mtk_nor *sp;
        void __iomem *base;
-       struct clk *spi_clk, *ctlr_clk;
+       struct clk *spi_clk, *ctlr_clk, *axi_clk;
        int ret, irq;
        unsigned long dma_bits;
 
@@ -762,6 +771,10 @@ static int mtk_nor_probe(struct platform_device *pdev)
        if (IS_ERR(ctlr_clk))
                return PTR_ERR(ctlr_clk);
 
+       axi_clk = devm_clk_get_optional(&pdev->dev, "axi");
+       if (IS_ERR(axi_clk))
+               return PTR_ERR(axi_clk);
+
        dma_bits = (unsigned long)of_device_get_match_data(&pdev->dev);
        if (dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(dma_bits))) {
                dev_err(&pdev->dev, "failed to set dma mask(%lu)\n", dma_bits);
@@ -794,6 +807,7 @@ static int mtk_nor_probe(struct platform_device *pdev)
        sp->dev = &pdev->dev;
        sp->spi_clk = spi_clk;
        sp->ctlr_clk = ctlr_clk;
+       sp->axi_clk = axi_clk;
        sp->high_dma = (dma_bits > 32);
        sp->buffer = dmam_alloc_coherent(&pdev->dev,
                                MTK_NOR_BOUNCE_BUF_SIZE + MTK_NOR_DMA_ALIGN,
-- 
1.9.1